MAD LAB SYLLABUS

Exp 1: Introduction to mobile technologies and devices
Android platform and applications overview

Exp 2:Setting Android development environments

Creating a New project:

Open Android Studio and then click on File -> New -> New project.

Then type the Application name as “exno1″and click Next.

Then select the Minimum SDK as shown below and click Next.

Then select the Empty Activity and click Next.

Finally click Finish.

It will take some time to build and load the project.

Exp 4:Develop an application that uses GUI components, Font and Colours
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/textView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="30dp" android:gravity="center" android:text="Hello World!" android:textSize="25sp" android:textStyle="bold" /> <Button android:id="@+id/button1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="20dp" android:gravity="center" android:text="Change font size" android:textSize="25sp" /> <Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="20dp" android:gravity="center" android:text="Change color" android:textSize="25sp" /> </LinearLayout>
Java Coding for the Android Application:

Click on app -> java -> com.example.exp4 -> MainActivity.java

   
package com.example.exp4;
import android.graphics.Color;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity
{
    int ch=1;
    float font=30;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final TextView t= (TextView) findViewById(R.id.textView);
        Button b1= (Button) findViewById(R.id.button1);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                t.setTextSize(font);
                font = font + 5;
                if (font == 50)
                    font = 30;
            }
        });
        Button b2= (Button) findViewById(R.id.button2);
        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (ch) {
                    case 1:
                        t.setTextColor(Color.RED);
                        break;
                    case 2:
                        t.setTextColor(Color.GREEN);
                        break;
                    case 3:
                        t.setTextColor(Color.BLUE);
                        break;
                    case 4:
                        t.setTextColor(Color.CYAN);
                        break;
                    case 5:
                        t.setTextColor(Color.YELLOW);
                        break;
                    case 6:
                        t.setTextColor(Color.MAGENTA);
                        break;
                }
                ch++;
                if (ch == 7)
                    ch = 1;
            }
        });
    }
}

Exp5:Develop an application that uses Layout Managers and event listeners.

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp">
        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="30dp"
            android:text="Details Form"
            android:textSize="25sp"
            android:gravity="center"/>
    </LinearLayout>
    <GridLayout
        android:id="@+id/gridLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="100dp"
        android:layout_marginBottom="200dp"
        android:columnCount="2"
        android:rowCount="3">
        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_row="0"
            android:layout_column="0"
            android:layout_margin="10dp"
            android:gravity="center"
            android:text="Name"
            android:textSize="20sp" />
        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_row="0"
            android:layout_column="1"
            android:layout_margin="10dp"
            android:ems="10" />
        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_row="1"
            android:layout_column="0"
            android:layout_margin="10dp"
            android:gravity="center"
            android:text="Reg.No"
            android:textSize="20sp" />
        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_row="1"
            android:layout_column="1"
            android:layout_margin="10dp"
            android:ems="10"
            android:inputType="number" />
        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_row="2"
            android:layout_column="0"
            android:layout_margin="10dp"
            android:gravity="center"
            android:text="Dept"
            android:textSize="20sp" />
        <Spinner
            android:id="@+id/spinner"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_row="2"
            android:layout_column="1"
            android:layout_margin="10dp"
            android:spinnerMode="dropdown" />
    </GridLayout>
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerInParent="true"
        android:layout_marginBottom="150dp"
        android:text="Submit"/>
</RelativeLayout>

app -> res -> layout -> activity_main2.xml

  
 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity2"
android:orientation="vertical"
android:gravity="center">

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="20dp"
    android:text="New Text"
    android:textSize="30sp"/>

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="20dp"
    android:text="New Text"
    android:textSize="30sp"/>

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="20dp"
    android:text="New Text"
    android:textSize="30sp"/>

</LinearLayout>

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp05 -> MainActivity.

   
package com.example.exp05;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;

public class MainActivity extends AppCompatActivity {

    //Defining the Views
    EditText e1,e2;
    Button bt;
    Spinner s;

    //Data for populating in Spinner
    String [] dept_array={"CSE","CSE-AI&ML","ECE","IT","Mech","Civil"};

    String name,reg,dept;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Referring the Views
        e1= (EditText) findViewById(R.id.editText);
        e2= (EditText) findViewById(R.id.editText2);

        bt= (Button) findViewById(R.id.button);

        s= (Spinner) findViewById(R.id.spinner);

        //Creating Adapter for Spinner for adapting the data from array to Spinner
        ArrayAdapter adapter= new ArrayAdapter(MainActivity.this,android.R.layout.simple_spinner_item,dept_array);
        s.setAdapter(adapter);

        //Creating Listener for Button
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //Getting the Values from Views(Edittext & Spinner)
                name=e1.getText().toString();
                reg=e2.getText().toString();
                dept=s.getSelectedItem().toString();

                //Intent For Navigating to Second Activity
                Intent i = new Intent(MainActivity.this,MainActivity2.class);

                //For Passing the Values to Second Activity
                i.putExtra("name_key", name);
                i.putExtra("reg_key",reg);
                i.putExtra("dept_key", dept);

                startActivity(i);

            }
        });
    }
}

Code for MainActivity2.java:

package com.example.exp05;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.content.Intent;

import android.widget.TextView;

public class MainActivity2 extends AppCompatActivity {

    TextView t1,t2,t3;

    String name,reg,dept;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        t1= (TextView) findViewById(R.id.textView1);
        t2= (TextView) findViewById(R.id.textView2);
        t3= (TextView) findViewById(R.id.textView3);

        //Getting the Intent
        Intent i = getIntent();

        //Getting the Values from First Activity using the Intent received
        name=i.getStringExtra("name_key");
        reg=i.getStringExtra("reg_key");
        dept=i.getStringExtra("dept_key");

        //Setting the Values to Intent
        t1.setText(name);
        t2.setText(reg);
        t3.setText(dept);

    }
}

Exp 6:Write an application that draws basic graphical primitives on the screen.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

  <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView" />
</RelativeLayout>

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp06 -> MainActivity.

package com.example.exp06;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.widget.ImageView;

public class MainActivity extends Activity
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Creating a Bitmap
        Bitmap bg = Bitmap.createBitmap(720, 1280, Bitmap.Config.ARGB_8888);

        //Setting the Bitmap as background for the ImageView
        ImageView i = (ImageView) findViewById(R.id.imageView);
        i.setBackgroundDrawable(new BitmapDrawable(bg));

        //Creating the Canvas Object
        Canvas canvas = new Canvas(bg);

        //Creating the Paint Object and set its color & TextSize
        Paint paint = new Paint();
        paint.setColor(Color.BLUE);
        paint.setTextSize(50);

        //To draw a Rectangle
        canvas.drawText("Rectangle", 420, 150, paint);
        canvas.drawRect(400, 200, 650, 700, paint);

        //To draw a Circle
        canvas.drawText("Circle", 120, 150, paint);
        canvas.drawCircle(200, 350, 150, paint);

        //To draw a Square
        canvas.drawText("Square", 120, 800, paint);
        canvas.drawRect(50, 850, 350, 1150, paint);

        //To draw a Line
        canvas.drawText("Line", 480, 800, paint);
        canvas.drawLine(520, 850, 520, 1150, paint);
    }
}

Exp 7:Develop an application that makes use of databases.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

  
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="50dp"
        android:layout_y="20dp"
        android:text="Student Details"
        android:textSize="30sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="20dp"
        android:layout_y="110dp"
        android:text="Enter Rollno:"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/Rollno"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_x="175dp"
        android:layout_y="100dp"
        android:inputType="number"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="20dp"
        android:layout_y="160dp"
        android:text="Enter Name:"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/Name"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_x="175dp"
        android:layout_y="150dp"
        android:inputType="text"
        android:textSize="20sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_x="20dp"
        android:layout_y="210dp"
        android:text="Enter Marks:"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/Marks"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_x="175dp"
        android:layout_y="200dp"
        android:inputType="number"
        android:textSize="20sp" />

    <Button
        android:id="@+id/Insert"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_x="25dp"
        android:layout_y="300dp"
        android:text="Insert"
        android:textSize="30dp" />

    <Button
        android:id="@+id/Delete"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_x="200dp"
        android:layout_y="300dp"
        android:text="Delete"
        android:textSize="30dp" />

    <Button
        android:id="@+id/Update"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_x="25dp"
        android:layout_y="400dp"
        android:text="Update"
        android:textSize="30dp" />

    <Button
        android:id="@+id/View"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_x="200dp"
        android:layout_y="400dp"
        android:text="View"
        android:textSize="30dp" />

    <Button
        android:id="@+id/ViewAll"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_x="100dp"
        android:layout_y="500dp"
        android:text="View All"
        android:textSize="30dp" />

</AbsoluteLayout>

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp07 -> MainActivity.


package com.example.exp07;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener
{
    EditText Rollno,Name,Marks;
    Button Insert,Delete,Update,View,ViewAll;
    SQLiteDatabase db;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Rollno=(EditText)findViewById(R.id.Rollno);
        Name=(EditText)findViewById(R.id.Name);
        Marks=(EditText)findViewById(R.id.Marks);
        Insert=(Button)findViewById(R.id.Insert);
        Delete=(Button)findViewById(R.id.Delete);
        Update=(Button)findViewById(R.id.Update);
        View=(Button)findViewById(R.id.View);
        ViewAll=(Button)findViewById(R.id.ViewAll);

        Insert.setOnClickListener(this);
        Delete.setOnClickListener(this);
        Update.setOnClickListener(this);
        View.setOnClickListener(this);
        ViewAll.setOnClickListener(this);

        // Creating database and table
        db=openOrCreateDatabase("StudentDB", Context.MODE_PRIVATE, null);
        db.execSQL("CREATE TABLE IF NOT EXISTS student(rollno VARCHAR,name VARCHAR,marks VARCHAR);");
    }
    public void onClick(View view)
    {
        // Inserting a record to the Student table
        if(view==Insert)
        {
            // Checking for empty fields
            if(Rollno.getText().toString().trim().length()==0||
                    Name.getText().toString().trim().length()==0||
                    Marks.getText().toString().trim().length()==0)
            {
                showMessage("Error", "Please enter all values");
                return;
            }
            db.execSQL("INSERT INTO student VALUES('"+Rollno.getText()+"','"+Name.getText()+
                    "','"+Marks.getText()+"');");
            showMessage("Success", "Record added");
            clearText();
        }
        // Deleting a record from the Student table
        if(view==Delete)
        {
            // Checking for empty roll number
            if(Rollno.getText().toString().trim().length()==0)
            {
                showMessage("Error", "Please enter Rollno");
                return;
            }
            Cursor c=db.rawQuery("SELECT * FROM student WHERE rollno='"+Rollno.getText()+"'", null);
            if(c.moveToFirst())
            {
                db.execSQL("DELETE FROM student WHERE rollno='"+Rollno.getText()+"'");
                showMessage("Success", "Record Deleted");
            }
            else
            {
                showMessage("Error", "Invalid Rollno");
            }
            clearText();
        }
        // Updating a record in the Student table
        if(view==Update)
        {
            // Checking for empty roll number
            if(Rollno.getText().toString().trim().length()==0)
            {
                showMessage("Error", "Please enter Rollno");
                return;
            }
            Cursor c=db.rawQuery("SELECT * FROM student WHERE rollno='"+Rollno.getText()+"'", null);
            if(c.moveToFirst()) {
                db.execSQL("UPDATE student SET name='" + Name.getText() + "',marks='" + Marks.getText() +
                        "' WHERE rollno='"+Rollno.getText()+"'");
                showMessage("Success", "Record Modified");
            }
            else {
                showMessage("Error", "Invalid Rollno");
            }
            clearText();
        }
        // Display a record from the Student table
        if(view==View)
        {
            // Checking for empty roll number
            if(Rollno.getText().toString().trim().length()==0)
            {
                showMessage("Error", "Please enter Rollno");
                return;
            }
            Cursor c=db.rawQuery("SELECT * FROM student WHERE rollno='"+Rollno.getText()+"'", null);
            if(c.moveToFirst())
            {
                Name.setText(c.getString(1));
                Marks.setText(c.getString(2));
            }
            else
            {
                showMessage("Error", "Invalid Rollno");
                clearText();
            }
        }
        // Displaying all the records
        if(view==ViewAll)
        {
            Cursor c=db.rawQuery("SELECT * FROM student", null);
            if(c.getCount()==0)
            {
                showMessage("Error", "No records found");
                return;
            }
            StringBuffer buffer=new StringBuffer();
            while(c.moveToNext())
            {
                buffer.append("Rollno: "+c.getString(0)+"\n");
                buffer.append("Name: "+c.getString(1)+"\n");
                buffer.append("Marks: "+c.getString(2)+"\n\n");
            }
            showMessage("Student Details", buffer.toString());
        }
    }
    public void showMessage(String title,String message)
    {
        Builder builder=new Builder(this);
        builder.setCancelable(true);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.show();
    }
    public void clearText()
    {
        Rollno.setText("");
        Name.setText("");
        Marks.setText("");
        Rollno.requestFocus();
    }
}

Exp 9:Implement an application that uses Multi-threading
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

<ImageView
        android:id="@+id/imageView"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:layout_margin="50dp"
        android:layout_gravity="center" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_gravity="center"
        android:text="Load Image 1" />
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:layout_gravity="center"
        android:text="Load image 2" />

</LinearLayout>

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp09 -> MainActivity.

 package com.example.exp09;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    ImageView img;
    Button bt1, bt2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bt1 = (Button) findViewById(R.id.button);
        bt2 = (Button) findViewById(R.id.button2);
        img = (ImageView) findViewById(R.id.imageView);
        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        img.post(new Runnable() {
                            @Override
                            public void run() {
                                img.setImageResource(R.drawable.india1);
                            }
                        });
                    }
                }).start();
            }
        });

        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        img.post(new Runnable() {
                            @Override
                            public void run() {
                                img.setImageResource(R.drawable.india2);
                            }
                        });
                    }
                }).start();
            }
        });
    }
}

Note: Before running the application, download the images from google and paste it in “app -> res -> drawable” by pressing “right click mouse button on drawable” and selecting the “Paste” option.

Exp 10: Develop a native application that uses GPS location information
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

 
  <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    android:layout_width = "fill_parent"
    android:layout_height = "fill_parent"
    android:orientation = "vertical" >

    <Button
        android:id = "@+id/button"
        android:layout_width = "fill_parent"
        android:layout_height = "wrap_content"
        android:text = "getlocation"/>
</LinearLayout>

Adding permissions in Manifest for the Android Application: Click on app -> manifests -> AndroidManifest.xml.

 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.exp10">
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name = "android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Exp10"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp10 -> MainActivity.

  package com.example.exp10;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.core.app.ActivityCompat;

public class MainActivity extends Activity {

    Button btnShowLocation;
    private static final int REQUEST_CODE_PERMISSION = 2;
    String mPermission = Manifest.permission.ACCESS_FINE_LOCATION;

    // GPSTracker class
    GPSTracker gps;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        try {
            if (ActivityCompat.checkSelfPermission(this, mPermission)!= PackageManager.PERMISSION_GRANTED) {

                ActivityCompat.requestPermissions(this, new String[]{mPermission},
                        REQUEST_CODE_PERMISSION);

                // If any permission above not allowed by user, this condition will execute every time, else your else part will work
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        btnShowLocation = (Button) findViewById(R.id.button);
        // show location button click event
        btnShowLocation.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // create class object
                gps = new GPSTracker(MainActivity.this);

                // check if GPS enabled
                if(gps.canGetLocation()){

                    double latitude = gps.getLatitude();
                    double longitude = gps.getLongitude();

                    // \n is for new line
                    Toast.makeText(getApplicationContext(), "Your Location is - \nLat: "
                            + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
                }else{
                    // can't get location
                    // GPS or Network is not enabled
                    // Ask user to enable GPS/network in settings
                    gps.showSettingsAlert();
                }

            }
        });
    }
}

Add a Empty Activity GPSTracker.java :

Click on app -> java -> com.example.exp10 -> GPSTracker.

  package com.example.exp10;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    @SuppressLint("MissingPermission")
    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                // First get location from Network Provider
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }

                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);

                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

/**
 *       * Stop using GPS listener
 *       * Calling this function will stop using GPS in your app
 *    * */

public void stopUsingGPS() {
    if (locationManager != null) {
        locationManager.removeUpdates(GPSTracker.this);
    }
}
/**
 * Function to get latitude
 * */
public double getLatitude(){
    if(location != null){
        latitude = location.getLatitude();
    }

    // return latitude
    return latitude;
}
    /**
     * Function to get longitude
     * */

    public double getLongitude(){
        if(location != null) {
            longitude = location.getLongitude();
        }
        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */

    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");
        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });
        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }
    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }
}

Exp 11:Implement an application that writes data to the SD card.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="12dp"
    tools:context=".MainActivity">
    <TextView
        android:textStyle="bold"
        android:textAlignment="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Reading and Writing to External Storage"
        android:textSize="24sp" />
    <EditText
        android:layout_marginTop="30dp"
        android:id="@+id/myInputText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:gravity="top|start"
        android:lines="5"
        android:minLines="3">
    </EditText>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:orientation="horizontal"
        android:weightSum="1.0">
        <Button
            android:id="@+id/saveExternalStorage"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:text="SAVE" />
        <Button
            android:id="@+id/getExternalStorage"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:text="READ" />
    </LinearLayout>
    <TextView
        android:layout_marginTop="10dp"
        android:id="@+id/response"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp11 -> MainActivity.

package com.example.exp11;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
public class MainActivity extends AppCompatActivity {
    EditText editText;
    TextView textView;
    Button saveButton, readButton;
    File myExternalFile;
    String myData = "";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = findViewById(R.id.myInputText);
        textView = findViewById(R.id.response);
        saveButton = findViewById(R.id.saveExternalStorage);
        saveButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    FileOutputStream fos = new FileOutputStream(myExternalFile);
                    fos.write(editText.getText().toString().getBytes());
                    fos.close();
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
                editText.setText("");
                textView.setText("SampleFile.txt saved to External Storage...");
            }
        });
        readButton = findViewById(R.id.getExternalStorage);
        readButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    FileInputStream fis = new FileInputStream(myExternalFile);
                    DataInputStream in = new DataInputStream(fis);
                    BufferedReader br = new BufferedReader(new InputStreamReader(in));
                    String strLine;
                    while ((strLine = br.readLine()) != null) {
                        myData = myData + strLine;
                    }
                    in.close();
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
                editText.setText(myData);
                textView.setText("SampleFile.txt data retrieved from Internal Storage...");
            }
        });
        if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
            saveButton.setEnabled(false);
        }
        else {
            String fileName = "SampleFile.txt";
            String filePath = "MyFolder";
            myExternalFile = new File(getExternalFilesDir(filePath), fileName);
        }
    }
    private static boolean isExternalStorageReadOnly() {
        String extStorageState = Environment.getExternalStorageState();
        return Environment.MEDIA_MOUNTED_READ_ONLY.equals(extStorageState);
    }
    private static boolean isExternalStorageAvailable() {
        String extStorageState = Environment.getExternalStorageState();
        return Environment.MEDIA_MOUNTED.equals(extStorageState);
    }
}

Note: It is necessary to add external storage the permission to read and write. For that you need to add permission in android Manifest file. Open AndroidManifest.xml file in Manifests and add permissions to it just after the package name.

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

Exp 13: Write a mobile application that makes use of RSS feed.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ListView
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

    </LinearLayout>

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp11 -> MainActivity.

package com.example.exp13;

import android.os.Bundle;
import android.app.ListActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;


public class MainActivity extends ListActivity
{
    List headlines;
    List links;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        new MyAsyncTask().execute();
    }

        class MyAsyncTask extends AsyncTask<Object,Void,ArrayAdapter>
        {
            @Override
            protected ArrayAdapter doInBackground(Object[] params)
            {
                headlines = new ArrayList();
                links = new ArrayList();
                try
                {
                    URL url = new URL("https://codingconnect.net/feed");
                    XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
                    factory.setNamespaceAware(false);
                    XmlPullParser xpp = factory.newPullParser();

                    // We will get the XML from an input stream
                    xpp.setInput(getInputStream(url), "UTF_8");
                    boolean insideItem = false;

                    // Returns the type of current event: START_TAG, END_TAG, etc..
                    int eventType = xpp.getEventType();
                    while (eventType != XmlPullParser.END_DOCUMENT)
                    {
                        if (eventType == XmlPullParser.START_TAG)
                        {
                            if (xpp.getName().equalsIgnoreCase("item"))
                            {
                            insideItem = true;
                            }
                            else if (xpp.getName().equalsIgnoreCase("title"))
                            {
                            if (insideItem)
                            headlines.add(xpp.nextText()); //extract the headline
                            }
                            else if (xpp.getName().equalsIgnoreCase("link"))
                            {
                            if (insideItem)
                            links.add(xpp.nextText()); //extract the link of article
                            }
                        }
                        else if(eventType==XmlPullParser.END_TAG && xpp.getName().equalsIgnoreCase("item"))
                        {
                        insideItem=false;
                        }
                        eventType = xpp.next(); //move to next element
                    }
                }
                catch (MalformedURLException e)
                {
                e.printStackTrace();
                }
                catch (XmlPullParserException e)
                {
                e.printStackTrace();
                }
                catch (IOException e)
                {
                e.printStackTrace();
                }
                return null;
            }
            protected void onPostExecute(ArrayAdapter adapter)
            {
            adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_list_item_1, headlines);
            setListAdapter(adapter);
            }
        }

        @Override
        protected void onListItemClick(ListView l, View v, int position, long id)
        {
        Uri uri = Uri.parse((links.get(position)).toString());
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        startActivity(intent);
        }

        public InputStream getInputStream(URL url)
        {
            try
            {
            return url.openConnection().getInputStream();
            }
            catch (IOException e)
            {
            return null;
            }
        }
    }

Code for Android Manifest XMl:

Click on app -> manifests -> AndroidManifest.xml .

  <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.exp13" >

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true">
    <activity android:name=".MainActivity"
        android:exported="true">
        <intent-filter>
             <action android:name="android.intent.action.MAIN" />

             <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    </application>

    </manifest>

Dr. K. Sandeep

MOBILE APP DEVELOPMENT

MAD LAB SYLLABUS

Exp5:Develop an application that uses Layout Managers and event listeners.

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

app -> res -> layout -> activity_main2.xml

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp05 -> MainActivity.

Code for MainActivity2.java:

Exp 6:Write an application that draws basic graphical primitives on the screen.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp06 -> MainActivity.

Exp 7:Develop an application that makes use of databases.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp07 -> MainActivity.

Exp 9:Implement an application that uses Multi-threading
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp09 -> MainActivity.

Note: Before running the application, download the images from google and paste it in “app -> res -> drawable” by pressing “right click mouse button on drawable” and selecting the “Paste” option.

Exp 10: Develop a native application that uses GPS location information
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Adding permissions in Manifest for the Android Application: Click on app -> manifests -> AndroidManifest.xml.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp10 -> MainActivity.

Add a Empty Activity GPSTracker.java :

Click on app -> java -> com.example.exp10 -> GPSTracker.

Exp 11:Implement an application that writes data to the SD card.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp11 -> MainActivity.

Exp 13: Write a mobile application that makes use of RSS feed.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp11 -> MainActivity.

Code for Android Manifest XMl:

Click on app -> manifests -> AndroidManifest.xml .

2 comments:

MOBILE APP DEVELOPMENT

MAD LAB SYLLABUS

Exp5:Develop an application that uses Layout Managers and event listeners. Click on app -> res -> layout -> activity_main.xml. Then delete the code which is there and type the code as given below.

app -> res -> layout -> activity_main2.xml

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp05 -> MainActivity.

Code for MainActivity2.java:

Exp 6:Write an application that draws basic graphical primitives on the screen. Designing layout for the Android Application: Click on app -> res -> layout -> activity_main.xml. Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp06 -> MainActivity.

Exp 7:Develop an application that makes use of databases. Designing layout for the Android Application: Click on app -> res -> layout -> activity_main.xml. Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp07 -> MainActivity.

Exp 9:Implement an application that uses Multi-threading Designing layout for the Android Application: Click on app -> res -> layout -> activity_main.xml. Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp09 -> MainActivity.

Note: Before running the application, download the images from google and paste it in “app -> res -> drawable” by pressing “right click mouse button on drawable” and selecting the “Paste” option.

Exp 10: Develop a native application that uses GPS location information Designing layout for the Android Application: Click on app -> res -> layout -> activity_main.xml. Then delete the code which is there and type the code as given below.

Adding permissions in Manifest for the Android Application: Click on app -> manifests -> AndroidManifest.xml.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp10 -> MainActivity.

Add a Empty Activity GPSTracker.java :

Click on app -> java -> com.example.exp10 -> GPSTracker.

Exp 11:Implement an application that writes data to the SD card. Designing layout for the Android Application: Click on app -> res -> layout -> activity_main.xml. Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp11 -> MainActivity.

Exp 13: Write a mobile application that makes use of RSS feed. Designing layout for the Android Application: Click on app -> res -> layout -> activity_main.xml. Then delete the code which is there and type the code as given below.

Java Coidng for Main Activity:

Click on app -> java -> com.example.exp11 -> MainActivity.

Code for Android Manifest XMl:

Click on app -> manifests -> AndroidManifest.xml .

2 comments:

Exp5:Develop an application that uses Layout Managers and event listeners.

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Exp 6:Write an application that draws basic graphical primitives on the screen.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Exp 7:Develop an application that makes use of databases.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Exp 9:Implement an application that uses Multi-threading
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Exp 10: Develop a native application that uses GPS location information
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Exp 11:Implement an application that writes data to the SD card.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.

Exp 13: Write a mobile application that makes use of RSS feed.
Designing layout for the Android Application:

Click on app -> res -> layout -> activity_main.xml.

Then delete the code which is there and type the code as given below.