Block incoming calls in Android

Question

I can block incoming calls in android, but the problems that it rings for a split second before the time is turned off. How can I directly turn off the phone without a single call?

I added permission to the Manifest file:

 <uses-permission android:name="android.permission.READ_CONTACTS"/> <uses-permission android:name="android.permission.MODIFY_PHONE_STATE"></uses-permission> <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission> <uses-permission android:name="android.permission.CALL_PHONE"></uses-permission> <uses-feature android:name="android.hardware.telephony" /> 

Then create an IDL interface to get the basic telephony service.

  package com.android.internal.telephony; interface ITelephony { boolean endCall(); void answerRingingCall(); void silenceRinger(); } 

Then a broadcast receiver was made for the incoming call.

 public class PhonecallReceiver extends BroadcastReceiver { Context context = null; @Override public void onReceive(Context context, Intent intent) { Log.i(TAG, "Receving call..."); TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); try { Class c = Class.forName(telephony.getClass().getName()); Method m = c.getDeclaredMethod("getITelephony"); m.setAccessible(true); ITelephony telephonyService = (ITelephony) m.invoke(telephony); Bundle b = intent.getExtras(); String incommingNumber = b.getString(TelephonyManager.EXTRA_INCOMING_NUMBER); telephonyService.endCall(); }catch (Exception e){ e.printStackTrace(); }} 

Answer 1

So far, the Mission is impossible. View the reason here: Why it is not possible to intercept incoming calls on Android .

But I offer you another temporary solution, which I myself made:

Before blocking a call, the first thing you need to do is get the current phone ringer mode and then turn on silence:

 AudioManager audiomanage = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE); int ringerMode = audiomanage.getRingerMode(); audiomanage.setRingerMode(AudioManager.RINGER_MODE_SILENT); 

After blocking the call (or not), you will get the initial mode:

 audiomanage.setRingerMode(ringerMode); 

You will need the following permissions:

 <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" /> <uses-permission android:name="android.permission.WRITE_SETTINGS"/> <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS"/> 

I hope I helped you.