“Develope Program To a) Send SMS b) Receive SMS”

Activity_main.xml
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="70sp"
android:layout_marginTop="100sp"
android:text="Send/Receiver SMS"
android:textColor="#009688"
android:textSize="30sp"
android:textStyle="bold"/>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enter mobile no : "
android:textSize="18sp"
android:layout_marginTop="80sp"
android:layout_marginLeft="30sp"
android:textColor="#673AB7"
android:textStyle="bold"/>
<EditText
android:id="@+id/number"
android:layout_width="150sp"
android:layout_height="wrap_content"
android:layout_marginTop="-40sp"
android:layout_marginLeft="180sp"/>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enter Message : "
android:textSize="18sp"
android:layout_marginTop="70sp"
android:layout_marginLeft="40sp"
android:textColor="#4CAF50"
android:textStyle="bold"/>

<EditText
android:id="@+id/message"
android:layout_width="200sp"
android:layout_height="wrap_content"
android:layout_marginTop="-40sp"
android:layout_marginLeft="180sp"/>

<Button
android:id="@+id/button"
android:layout_width="200sp"
android:layout_height="wrap_content"
android:text="Send ->"
 android:textStyle="bold"
android:textSize="20sp"
android:layout_marginTop="70sp"
android:layout_marginLeft="100sp"/>

</LinearLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

EditText no,msg;
Button sms;

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

if (ContextCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.SEND_SMS) != PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(MainActivity.this, new
String[]{Manifest.permission.SEND_SMS},100);
}

no = findViewById(R.id.number);
msg = findViewById(R.id.message);
sms = findViewById(R.id.button);

sms.setOnClickListener(new View.OnClickListener() {
 @Override
public void onClick(View v) {
String num = no.getText().toString();
String txt = msg.getText().toString();

try {
SmsManager sms = SmsManager.getDefault();
sms.sendTextMessage(num,null,txt,null,null);
Toast.makeText(MainActivity.this, "Message Sent... :)",
Toast.LENGTH_SHORT).show();
}
catch(Exception e) {
Toast.makeText(MainActivity.this, "Message Not Sent... :(",
Toast.LENGTH_SHORT).show();
}

}
});
}
}

Receive.java

public class Receive extends BroadcastReceiver {

private static final String SMS_RECEIVED_ACTION =
"android.provider.Telephony.SMS_RECEIVED";
String Message;

@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onReceive(Context context, Intent intent) {
 boolean isVersionM = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M);

if (intent.getAction().equals(SMS_RECEIVED_ACTION)) {
Bundle bundle = intent.getExtras();
if (bundle != null) {
String format = bundle.getString("format");

Object[] objects = (Object[]) bundle.get("pdus");

if (objects != null) {
SmsMessage[] messages = new SmsMessage[objects.length];

for (int i = 0; i < objects.length; i++) {

if (isVersionM) {
messages[i] = SmsMessage.createFromPdu((byte[]) objects[i], format);
} else {
messages[i] = SmsMessage.createFromPdu((byte[]) objects[i]);
}
}
}
}
}
}
}

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">
 <uses-feature
android:name="android.hardware.telephony"
android:required="false" />

<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<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.Sms"
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>