Android - Cant See The Incoming Calls When LayoutParams.TypeSystemError Is Displayed

I'm developing lock screen app. Here Lock screen is displayed on the top of the screen using this command 'WindowManager.LayoutParams.TYPE_SYSTEM_ERROR;' But my problem is I can't

Solution 1:

1. Add receiver in the manifest and ask for permission

   <receiver android:name=".IncomingCall">   
           <intent-filter>
           <action android:name="android.intent.action.PHONE_STATE" />
           </intent-filter>
   </receiver>
   

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

2. Create class IncomingCall

   public class IncomingCall extends BroadcastReceiver {
   
   public void onReceive(Context context, Intent intent) {
   
       try {
               TelephonyManager telephonyManager = (TelephonyManager) context
                       .getSystemService(Context.TELEPHONY_SERVICE);
   
               MyPhoneStateListener PhoneListener = new MyPhoneStateListener();
   
               // Register listener for LISTEN_CALL_STATE
               telephonyManager.listen(PhoneListener, PhoneStateListener.LISTEN_CALL_STATE);
   
       } catch (Exception e) {
           e.printStackTrace();
       }
   

3. Implement PhoneStateListener in LockScreen and call onCallStateChanged

   private class LockScreen extends AppCompatActivity implements PhoneStateListener{
   
       public void onCallStateChanged(int state, String incomingNumber) {
   
           //Disable lockscreen when calls come
   
       }