Android Lab file 2 to 12

Q2 A. Develop an Android application that uses GUI components, Font and Colors

android_main.xml :

<?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>

MainActivity.java :

package com.example.labfile;

import ndroid.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.graphics.Color;
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;
            }
        });
    }
}

Output :

==========================================================================

Q2 B . Develop an Android application that uses Layout Managers and event listeners. Subscription form and Login form

activity_main.xml :

<?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_margin="10dp"
            android:layout_row="0"
            android:layout_column="0"
            android:text="Name"
            android:textSize="20sp"
            android:gravity="center"/>

        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:layout_row="0"
            android:layout_column="1"
            android:ems="10"/>

        <TextView
           android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:layout_row="1"
            android:layout_column="0"
            android:text="Reg.No"
            android:textSize="20sp"
            android:gravity="center"/>

        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:layout_row="1"
            android:layout_column="1"
            android:inputType="number"
            android:ems="10"/>

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:layout_row="2"
            android:layout_column="0"
            android:text="Dept"
            android:textSize="20sp"
            android:gravity="center"/>

        <Spinner
            android:id="@+id/spinner"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:layout_row="2"
            android:layout_column="1"
            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>

MainActivity.java :

package com.example.labfile;

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 {
    EditText e1,e2;
    Button bt;
    Spinner s;
    String [] dept_array={"CSE","ECE","IT","Mech","Civil"};
    String name,reg,dept;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        e1= (EditText) findViewById(R.id.editText);
        e2= (EditText) findViewById(R.id.editText2);
        bt= (Button) findViewById(R.id.button);
       s= (Spinner) findViewById(R.id.spinner);

        ArrayAdapter adapter= new ArrayAdapter(MainActivity.this,android.R.layout.simple_spinner_item,dept_array);
        s.setAdapter(adapter);

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                name=e1.getText().toString();
                reg=e2.getText().toString();
                dept=s.getSelectedItem().toString();

                Intent i = new Intent(MainActivity.this,SecondActivity.class);
                i.putExtra("name_key", name);
                i.putExtra("reg_key",reg);
                i.putExtra("dept_key", dept);
                startActivity(i);

            }
        });
    }
}

activity_second.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="com.example.labfile.SecondActivity"
    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>

SecondActivity.java :

package com.example.labfile;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.widget.TextView;

public class SecondActivity extends AppCompatActivity {
    TextView t1,t2,t3;
    String name,reg,dept;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

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

        Intent i = getIntent();
        name=i.getStringExtra("name_key");
        reg=i.getStringExtra("reg_key");
        dept=i.getStringExtra("dept_key");

        t1.setText(name);
        t2.setText(reg);
        t3.setText(dept);
    }
}

Output :

==========================================================================

Q3.Create a fragment that has its own UI and enable your activities to communicate with fragments.

Activity_main.xml

<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:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".MainActivity">

<Button

android:id="@+id/firstFragment"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="@color/button_background_color"

android:text="First Fragment"

android:textColor="@color/white"

android:textSize="20sp" />

<Button

android:id="@+id/secondFragment"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="10dp"

android:background="@color/button_background_color"

android:text="Second Fragment"

android:textColor="@color/white"

android:textSize="20sp" />

<FrameLayout

android:id="@+id/frameLayout"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_marginTop="10dp" />

</LinearLayout>

MainActivity.java

package com.abhiandroid.fragmentexample;

import android.app.Fragment;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class MainActivity extends AppCompatActivity {

Button firstFragment, secondFragment;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// get the reference of Button's

firstFragment = (Button) findViewById(R.id.firstFragment);

secondFragment = (Button) findViewById(R.id.secondFragment);

// perform setOnClickListener event on First Button

firstFragment.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// load First Fragment

loadFragment(new FirstFragment());

}

});

// perform setOnClickListener event on Second Button

secondFragment.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// load Second Fragment

loadFragment(new SecondFragment());

}

});

}

private void loadFragment(Fragment fragment) {

// create a FragmentManager

FragmentManager fm = getFragmentManager();

// create a FragmentTransaction to begin the transaction and replace the Fragment

FragmentTransaction fragmentTransaction = fm.beginTransaction();

// replace the FrameLayout with new Fragment

fragmentTransaction.replace(R.id.frameLayout, fragment);

fragmentTransaction.commit(); // save the changes

}

FirstFragment.class

package com.abhiandroid.fragmentexample;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.Toast;

public class FirstFragment extends Fragment {

View view;

Button firstButton;

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

// Inflate the layout for this fragment

view = inflater.inflate(R.layout.fragment_first, container, false);

// get the reference of Button

firstButton = (Button) view.findViewById(R.id.firstButton);

// perform setOnClickListener on first Button

firstButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// display a message by using a Toast

Toast.makeText(getActivity(), "First Fragment", Toast.LENGTH_LONG).show();

}});

return view;

}}

SecondFragment.class

package com.abhiandroid.fragmentexample;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.Toast;

public class SecondFragment extends Fragment {

View view;

Button secondButton;

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

// Inflate the layout for this fragment

view = inflater.inflate(R.layout.fragment_second, container, false);

// get the reference of Button

secondButton = (Button) view.findViewById(R.id.secondButton);

// perform setOnClickListener on second Button

secondButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// display a message by using a Toast

Toast.makeText(getActivity(), "Second Fragment", Toast.LENGTH_LONG).show();

}});

return view;

}}

fragment_first.xml

<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="com.abhiandroid.fragmentexample.FirstFragment">

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_marginTop="100dp"

android:text="This is First Fragment"

android:textColor="@color/black"

android:textSize="25sp" />

<Button

android:id="@+id/firstButton"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_centerInParent="true"

android:layout_marginLeft="20dp"

android:layout_marginRight="20dp"

android:background="@color/green"

android:text="First Fragment"

android:textColor="@color/white"

android:textSize="20sp"

android:textStyle="bold" />

</RelativeLayout>

SecondActivity.xml

<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="com.abhiandroid.fragmentexample.SecondFragment">

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_marginTop="100dp"

android:text="This is Second Fragment"

android:textColor="@color/black"

android:textSize="25sp" />

<Button

android:id="@+id/secondButton"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_centerInParent="true"

android:layout_marginLeft="20dp"

android:layout_marginRight="20dp"

android:background="@color/green"

android:text="Second Fragment"

android:textColor="@color/white"

android:textSize="20sp"

android:textStyle="bold" />

</RelativeLayout>

Output :

==========================================================================

Q4. Write an android code to make simple registration page using Intent

activity_main.xml :

<?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">

<EditText

android:id="@+id/editTextUsername"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:hint="Username"

android:layout_marginTop="20dp"

android:layout_marginHorizontal="20dp"/>

<EditText

android:id="@+id/editTextEmail"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:hint="Email"

android:layout_below="@id/editTextUsername"

android:layout_marginTop="20dp"

android:layout_marginHorizontal="20dp"/>

<EditText

android:id="@+id/editTextPassword"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:hint="Password"

android:inputType="textPassword"

android:layout_below="@id/editTextEmail"

android:layout_marginTop="20dp"

android:layout_marginHorizontal="20dp"/>

<Button

android:id="@+id/btnRegister"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="Register"

android:layout_below="@id/editTextPassword"

android:layout_marginTop="20dp"

android:layout_marginHorizontal="20dp"/>

</RelativeLayout>

MainActivity.java :

package com.example.myapplication;// src/main/java/your_package_name/MainActivity.java

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// Get the views from the layout

EditText editTextUsername = findViewById(R.id.editTextUsername);

EditText editTextEmail = findViewById(R.id.editTextEmail);

EditText editTextPassword = findViewById(R.id.editTextPassword);

Button btnRegister = findViewById(R.id.btnRegister);

// Set click listener for the Register button

btnRegister.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

// Get the entered values

String username = editTextUsername.getText().toString().trim();

String email = editTextEmail.getText().toString().trim();

String password = editTextPassword.getText().toString().trim();

// Validate and display a toast with registration information

if (!username.isEmpty() && !email.isEmpty() && !password.isEmpty()) {

String registrationInfo = "Username: " + username + "\nEmail: " + email + "\nPassword: " + password;

showToast("Registration successful:\n" + registrationInfo);

} else {

showToast("Please fill in all the fields.");

}

});

}

private void showToast(String message) {

Toast.makeText(this, message, Toast.LENGTH_SHORT).show();

}

Output :

==========================================================================

Q5 . Write an application to demonstrate Alert Dialog Box in android.

activity_main.xml :

MainActivity.java :

package com.example.alertbox;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

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

        b = (Button) findViewById(R.id.alertBox);
        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("Alert !");
                builder.setMessage("Do you want to exit ?");
                builder.setPositiveButton("Yes",null)
                        .setNegativeButton("No",null);
                builder.show();
            }
        });
    }
}

Output :

==========================================================================

Q6. Demonstrate Array Adapter using List View to display list of fruits.

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<ListView

android:id="@+id/listViewFruits"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:divider="@android:color/darker_gray"

android:dividerHeight="0.5dp"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java :

package com.example.myapplication;// src/main/java/your_package_name/MainActivity.java

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

import java.util.Arrays;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ArrayList<String> fruitsList = new ArrayList<>(Arrays.asList(

"Apple", "Banana", "Orange", "Grapes", "Watermelon", "Mango", "Strawberry", "Pineapple"));

// Create ArrayAdapter

ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(

this,

android.R.layout.simple_list_item_1,

fruitsList);

ListView listViewFruits = findViewById(R.id.listViewFruits);

listViewFruits.setAdapter(arrayAdapter);

}

Output :

==========================================================================

Q7.Write an application to produce Notification

activity_main.xml :

MainActivity.java :

package com.example.a8;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;

public class MainActivity extends AppCompatActivity {

    private final String channelId = "notification_channel";
    private final int notificationId = 1;

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

        createNotificationChannel();

        Button showNotificationButton = findViewById(R.id.showNotificationButton);
        showNotificationButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showNotification();
            }
        });
    }

    private void createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            String name = "My Notification Channel";
            String descriptionText = "Channel description";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(channelId, name, importance);
            channel.setDescription(descriptionText);

            NotificationManager notificationManager =
                    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.createNotificationChannel(channel);
        }
    }

    private void showNotification() {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, channelId)
                .setSmallIcon(R.drawable.ic_notification)
                .setContentTitle("Notification Example")
                .setContentText("This is an Notification Example.")
                .setPriority(NotificationCompat.PRIORITY_DEFAULT);

        NotificationManagerCompat.from(this).notify(notificationId, builder.build());
    }
}

Output:-

==========================================================================

Q8. Create an application which demonstrate radio button, check button, and Spinner.

Activity_main.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"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity">

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <RadioButton
            android:id="@+id/radioButtonOption1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Option 1" />

        <RadioButton
            android:id="@+id/radioButtonOption2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Option 2" />
    </RadioGroup>

    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Check me" />

    <Spinner
       android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"/>
</LinearLayout>

MainActivity.java

package com.example.a9;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

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

        RadioGroup radioGroup = findViewById(R.id.radioGroup);
        CheckBox checkBox = findViewById(R.id.checkBox);
        Spinner spinner = findViewById(R.id.spinner);

        // Set a listener for RadioGroup
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton radioButton = findViewById(checkedId);
                if (radioButton != null) {
                    showToast("Selected: " + radioButton.getText());
                }
            }
        });

        // Set a listener for CheckBox
        checkBox.setOnClickListener(new View.OnClickListener() {
          @Override
            public void onClick(View v) {
                if (checkBox.isChecked()) {
                    showToast("CheckBox checked");
                } else {
                    showToast("CheckBox unchecked");
                }
            }
        });

        // Populate the Spinner with data
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this,
                R.array.spinner_options,
                android.R.layout.simple_spinner_item
        );
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        // Set a listener for Spinner
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
                String selectedOption = (String) parentView.getItemAtPosition(position);
                showToast("Selected Spinner Option: " + selectedOption);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parentView) {
                // Do nothing here
            }
        });
    }

    private void showToast(String message) {
        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
    }
}

strings.xml

<resources>
    <string-array name="spinner_options">
        <item>Option A</item>
        <item>Option B</item>
        <item>Option C</item>
    </string-array>
</resources>

Output:-

==========================================================================

Q9. Design screen to send email (compose email) using linear layout.

Activity_main.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"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:text="Design screen to send email (compose email) using linear layout.\n" />

    <EditText
        android:id="@+id/recipientEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Recipient"
        android:inputType="textEmailAddress" />

    <EditText
        android:id="@+id/subjectEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Subject" />

    <MultiAutoCompleteTextView
        android:id="@+id/bodyEditText"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:hint="Email Body"
        android:inputType="textMultiLine" />

    <Button
        android:id="@+id/sendButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Send Email" />

</LinearLayout>

MainActivity.java

package com.example.composeemail;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.MultiAutoCompleteTextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private EditText recipientEditText, subjectEditText;
    private MultiAutoCompleteTextView bodyEditText;

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

        recipientEditText = findViewById(R.id.recipientEditText);
        subjectEditText = findViewById(R.id.subjectEditText);
        bodyEditText = findViewById(R.id.bodyEditText);

        Button sendButton = findViewById(R.id.sendButton);
        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                sendEmail();
            }
        });
    }

    private void sendEmail() {
        String recipient = recipientEditText.getText().toString();
        String subject = subjectEditText.getText().toString();
        String body = bodyEditText.getText().toString();

        // You can implement the email sending logic here

        String message = "Email Sent!\nRecipient: " + recipient + "\nSubject: " + subject + "\nBody: " + body;
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }
}

Output :|

==========================================================================

Q10. Create application to demonstrate date and time picker.

Activity_main.xml

<?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">

<Button

android:id="@+id/btnShowDatePicker"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Show Date Picker"

android:layout_centerHorizontal="true"

android:layout_marginTop="50dp"/>

<Button

android:id="@+id/btnShowTimePicker"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Show Time Picker"

android:layout_below="@id/btnShowDatePicker"

android:layout_centerHorizontal="true"

android:layout_marginTop="20dp"/>

</RelativeLayout>

MainActivity.java :

package com.example.myapplication;// src/main/java/your_package_name/MainActivity.java

import android.app.DatePickerDialog;

import android.app.TimePickerDialog;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.DatePicker;

import android.widget.TimePicker;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button btnShowDatePicker = findViewById(R.id.btnShowDatePicker);

Button btnShowTimePicker = findViewById(R.id.btnShowTimePicker);

btnShowDatePicker.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

showDatePickerDialog();

}

});

btnShowTimePicker.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

showTimePickerDialog();

}

});

}

private void showDatePickerDialog() {

// Get the current date

Calendar calendar = Calendar.getInstance();

int year = calendar.get(Calendar.YEAR);

int month = calendar.get(Calendar.MONTH);

int day = calendar.get(Calendar.DAY_OF_MONTH);

// Create a Date Picker Dialog

DatePickerDialog datePickerDialog = new DatePickerDialog(

this,

new DatePickerDialog.OnDateSetListener() {

@Override

public void onDateSet(DatePicker datePicker, int selectedYear, int selectedMonth, int selectedDay) {

String date = selectedYear + "-" + (selectedMonth + 1) + "-" + selectedDay;

showToast("Selected Date: " + date);

}

year, month, day);

// Show the Date Picker Dialog

datePickerDialog.show();

}

private void showTimePickerDialog() {

Calendar calendar = Calendar.getInstance();

int hour = calendar.get(Calendar.HOUR_OF_DAY);

int minute = calendar.get(Calendar.MINUTE);

// Create a Time Picker Dialog

TimePickerDialog timePickerDialog = new TimePickerDialog(

this,

new TimePickerDialog.OnTimeSetListener() {

@Override

public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {

String time = selectedHour + ":" + selectedMinute;

showToast("Selected Time: " + time);

}

hour, minute, true); // true for 24-hour format

// Show the Time Picker Dialog

timePickerDialog.show();

}

private void showToast(String message) {

Toast.makeText(this, message, Toast.LENGTH_SHORT).show();

}

Output :

==========================================================================

Q11 . Design screen for payment board and display message on button click.

activity_main.xml :

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="443dp"
        android:layout_height="247dp"
        android:layout_marginTop="2dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/paypal" />

    <TextView
        android:id="@+id/textView"
      android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Card Number :"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.175"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.414"
        tools:ignore="TouchTargetSizeCheck" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="300dp"
        android:layout_height="40dp"
        android:layout_marginStart="49dp"
        android:layout_marginTop="14dp"
        android:layout_marginEnd="62dp"
        android:hint="Enter card number"
        android:inputType="number"
        android:textSize="18sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        tools:ignore="TouchTargetSizeCheck" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="250dp"
        android:text="Expiry Date :"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="170dp"
        android:layout_height="39dp"
        android:layout_marginStart="17dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="62dp"
        android:hint="Enter expiry date"
        android:textSize="18sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/textView2"
        app:layout_constraintTop_toBottomOf="@+id/editText"
        tools:ignore="TouchTargetSizeCheck" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="CVV :"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.135"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <EditText
        android:id="@+id/editText3"
        android:layout_width="170dp"
        android:layout_height="39dp"
        android:layout_marginTop="20dp"
        android:hint="Enter CVV"
        android:inputType="number"
        android:textSize="18sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.563"
        app:layout_constraintStart_toEndOf="@+id/textView3"
        app:layout_constraintTop_toBottomOf="@+id/editText2"
        tools:ignore="TouchTargetSizeCheck" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="49dp"
        android:layout_marginTop="35dp"
        android:layout_marginEnd="67dp"
        android:text="Name :"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toStartOf="@+id/editText4"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

    <EditText
        android:id="@+id/editText4"
        android:layout_width="170dp"
        android:layout_height="40dp"
        android:layout_marginTop="23dp"
        android:layout_marginEnd="62dp"
        android:layout_marginBottom="173dp"
        android:hint="Enter card owner name"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText3"
        tools:ignore="TouchTargetSizeCheck" />

    <Button
        android:id="@+id/button"
       android:layout_width="121dp"
        android:layout_height="48dp"
        android:layout_marginBottom="96dp"
        android:text="Add Card"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:ignore="TouchTargetSizeCheck" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java:

package com.example.labq11;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    EditText cNo, oName;
    String cardNo, ownerName;
    Button b;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        cNo = (EditText) findViewById(R.id.editText);
        oName = (EditText) findViewById(R.id.editText4);

        b = (Button) findViewById(R.id.button);
        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                submit(view);
            }
        });
    }
    public void submit(View v){
        cardNo = cNo.getText().toString();
        ownerName = oName.getText().toString();
        Toast.makeText(MainActivity.this,"Card "+cardNo +"\n added Successful",Toast.LENGTH_SHORT).show();
    }

}

Output :

==========================================================================

Q12. Write a program to demonstrate Options Menu in android for a restaurant and display appropriate message related to the dish user has opted from the menu on text field.

activity_main.xml.

Array.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="menu_options">
        <item>Pizza</item>
        <item>Burger</item>
        <item>Pasta</item>
        
    </string-array>

</resources>

MainActivity.java:

package com.example.a12practical;

import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.example.a12practical.R;

public class MainActivity extends AppCompatActivity {

    private Spinner menuSpinner;
    private TextView resultText;

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

        menuSpinner = findViewById(R.id.menuSpinner);
        resultText = findViewById(R.id.resultText);

        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this,
                R.array.menu_options,
                android.R.layout.simple_spinner_item
        );
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        menuSpinner.setAdapter(adapter);
    }

    public void displaySelectedDish(View view) {
        String selectedDish = menuSpinner.getSelectedItem().toString();
        String message = "You selected: " + selectedDish;
        resultText.setText(message);

Output-

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Android Lab file 2 to 12

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