android-phonestatelistener-phone-call-broadcast-receiver-tutorial

	<uses-permission android:name="android.permission.READ_PHONE_STATE" />
	<uses-permission android:name="android.permission.CALL_PHONE" />
	<receiver android:name=".IncomingCallReceiver" android:enabled="true" android:exported="true">
	<intent-filter>
	<action android:name="android.intent.action.PHONE_STATE" />
	</intent-filter>
	</receiver>
	-------------- package should be same as below-----------
	package com.android.internal.telephony;
	/**
	* Created by Md. Amirul Islam on 22-Sep-19.
	* Email : amirul.islam@uslbd.com
	* Unisoft™ Systems Limited
	*/
	public interface ITelephony {
	boolean endCall();
	void answerRingingCall();
	void silenceRinger();
	}
	----------------------------
	IncomingCallReceiver.java
	public class IncomingCallReceiver extends BroadcastReceiver {
	@Override
	public void onReceive(Context context, Intent intent) {
	ITelephony telephonyService;
	try {
	String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
	String number = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
	if(state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_RINGING)){
	TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
	try {
	Method m = tm.getClass().getDeclaredMethod("getITelephony");
	m.setAccessible(true);
	telephonyService = (ITelephony) m.invoke(tm);
	if ((number != null)) {
	telephonyService.endCall();
	Toast.makeText(context, "Ending the call from: " + number, Toast.LENGTH_SHORT).show();
	}
	} catch (Exception e) {
	e.printStackTrace();
	}
	Toast.makeText(context, "Ring " + number, Toast.LENGTH_SHORT).show();
	}
	if(state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_OFFHOOK)){
	Toast.makeText(context, "Answered " + number, Toast.LENGTH_SHORT).show();
	}
	if(state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_IDLE)){
	Toast.makeText(context, "Idle "+ number, Toast.LENGTH_SHORT).show();
	}
	} catch (Exception e) {
	e.printStackTrace();
	}
	}
	}
	=================================
	MainActivity.java
	-----------------
	public class MainActivity extends AppCompatActivity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
	checkPerms();
	}
	}
	@RequiresApi(api = Build.VERSION_CODES.M)
	private void checkPerms() {
	String[] perms = new String[]{
	Manifest.permission.CALL_PHONE,
	Manifest.permission.READ_PHONE_STATE
	};
	List<String> requestingPerms = new ArrayList<>();
	for (String perm : perms) {
	if (checkSelfPermission(perm) !=
	PackageManager.PERMISSION_GRANTED) {
	requestingPerms.add(perm);
	}
	}
	if (requestingPerms.size() > 0) {
	requestPermissions(requestingPerms.toArray(new String[requestingPerms.size()]), 0);
	}
	}
	}
	-------------------------------

view raw Callblock.java hosted with ❤ by GitHub

https://stackoverflow.com/questions/5990590/how-to-detect-phone-call-broadcast-receiver-in-android


https://gist.github.com/ftvs/e61ccb039f511eb288ee


http://droidcodesnippets.blogspot.com/2012/08/block-all-calls.html

http://www.nikola-breznjak.com/blog/android/make-native-android-app-can-block-phone-calls/

https://www.studytutorial.in/android-phonestatelistener-phone-call-broadcast-receiver-tutorial