Q. Write a program to create a toggle button to import android.widget.

Toast;
display ON / OFF Bluetooth on the display import android.widget.ToggleButton;
screen.
activity_main.xml public class MainActivity extends
AppCompatActivity {
<?xml version="1.0" encoding="utf-8"?> ToggleButton tb;
<AbsoluteLayout @Override
xmlns:android="http://schemas.android.com/apk/res protected void onCreate(Bundle
/android" savedInstanceState) {
xmlns:app="http://schemas.android.com/apk/res- super.onCreate(savedInstanceState);
auto" setContentView(R.layout.activity_main);
xmlns:tools="http://schemas.android.com/tools" tb=(ToggleButton)findViewById(R.id.tb11);
android:layout_width="match_parent" tb.setOnCheckedChangeListener(new
android:background="@drawable/immm" CompoundButton.OnCheckedChangeListener() {
android:layout_height="match_parent" @Override
tools:context=".MainActivity"> public void
onCheckedChanged(CompoundButton
<ToggleButton compoundButton, boolean b) {
android:id="@+id/tb11" if (b == true) {
android:layout_width="132dp" Toast.makeText(MainActivity.this,
android:layout_height="68dp" "Wifi on", Toast.LENGTH_SHORT).show();
android:layout_x="141dp" } else {
android:layout_y="296dp" Toast.makeText(MainActivity.this,
android:text="ToggleButton" "Wifi off", Toast.LENGTH_SHORT).show();
android:textOff="Off" }
android:background="@color/white"
android:textOn="On" }
android:fontFamily="times new roman" });
tools:layout_editor_absoluteX="99dp"
tools:layout_editor_absoluteY="273dp" /> }
}

</AbsoluteLayout>

MainActivity.java

package com.example.practicalno09_1;

import
androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.CompoundButton;
Q. Write a program to create a simple android:layout_height="wrap_content"
calculator. android:layout_marginTop="20dp"
android:layout_marginBottom="20dp"
activity_main.java
android:textSize="20dp"
<?xml version="1.0" encoding="utf-8"?> android:text="Result" />
<RelativeLayout <Button
android:id="@+id/sum"
xmlns:android="http://schemas.android.com/apk/res android:layout_below="@id/result"
/android" android:layout_width="wrap_content"
xmlns:app="http://schemas.android.com/apk/res- android:layout_height="wrap_content"
auto" android:textSize="20dp"
xmlns:tools="http://schemas.android.com/tools" android:layout_marginLeft="5dp"
android:layout_width="match_parent" android:text="+" />
android:layout_height="match_parent" <Button
android:padding="25dp" android:id="@+id/sub"
android:gravity="center" android:layout_below="@id/result"
tools:context=".MainActivity"> android:layout_toRightOf="@id/sum"
<TextView android:layout_width="wrap_content"
android:id="@+id/heading" android:layout_height="wrap_content"
android:layout_width="wrap_content" android:textSize="20dp"
android:layout_height="wrap_content" android:layout_marginLeft="5dp"
android:text=" Calculator" android:text="-" />
android:layout_centerHorizontal="true" <Button
android:textStyle="bold" android:id="@+id/div"
android:textSize="30dp" /> android:layout_below="@id/result"
<EditText android:layout_toRightOf="@id/sub"
android:id="@+id/num1" android:layout_width="wrap_content"
android:layout_below="@+id/heading" android:layout_height="wrap_content"
android:layout_width="match_parent" android:textSize="20dp"
android:layout_height="wrap_content" android:layout_marginLeft="5dp"
android:hint="Enter Number 1" android:text="/" />
android:inputType="number" /> <Button
<EditText android:id="@+id/mul"
android:id="@+id/num2" android:layout_below="@id/result"
android:layout_below="@+id/num1" android:layout_toRightOf="@id/div"
android:hint="Enter Number 2" android:layout_width="wrap_content"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_height="wrap_content" android:textSize="20dp"
android:inputType="number" /> android:layout_marginLeft="5dp"
<TextView android:text="x"/>
android:id="@+id/result" </RelativeLayout>
android:layout_below="@+id/num2"
android:layout_width="match_parent"
 });
MainActivity.java sub.setOnClickListener(new
View.OnClickListener() {
package com.example.practicalno09_2; @Override
public void onClick(View view) {
import num1 =
androidx.appcompat.app.AppCompatActivity; Integer.parseInt(e1.getText().toString());
import android.os.Bundle; num2 =
import android.view.View; Integer.parseInt(e2.getText().toString());
import android.widget.Button; int sum = num1 - num2;
import android.widget.EditText; t1.setText("Substraction is
import android.widget.TextView; :"+Integer.toString(sum));
public class MainActivity extends }
AppCompatActivity { });
public EditText e1, e2; mul.setOnClickListener(new
Button add, sub , mul, div; View.OnClickListener() {
TextView t1; @Override
int num1, num2; public void onClick(View view) {
@Override num1 =
protected void onCreate(Bundle Integer.parseInt(e1.getText().toString());
savedInstanceState) { num2 =
super.onCreate(savedInstanceState); Integer.parseInt(e2.getText().toString());
setContentView(R.layout.activity_main); int sum = num1 * num2;
e1 = (EditText) findViewById(R.id.num1); t1.setText("Multiplication is
e2 = (EditText) findViewById(R.id.num2); :"+Integer.toString(sum));
t1 = (TextView) findViewById(R.id.result); }
add = (Button) findViewById(R.id.sum); });
mul = (Button) findViewById(R.id.mul); div.setOnClickListener(new
div = (Button) findViewById(R.id.div); View.OnClickListener() {
sub = (Button) findViewById(R.id.sub); @Override
add.setOnClickListener(new public void onClick(View view) {
View.OnClickListener() { num1 =
@Override Integer.parseInt(e1.getText().toString());
public void onClick(View view) { num2 =
num1 = Integer.parseInt(e2.getText().toString());
Integer.parseInt(e1.getText().toString()); int sum = num1 / num2;
num2 = t1.setText("Division is
Integer.parseInt(e2.getText().toString()); :"+Integer.toString(sum));
int sum = num1 + num2; }
t1.setText("Addtion is });
:"+Integer.toString(sum)); }
} }