Is there a way on Android to intercept incoming calls/SMSes to either block/unblock it?

Question

Is there a way to intercept incomming calls/SMSes (to block or unblock it) on the basis of mobile numbers which are added to screening list?

Answer 1

----> For your question, I think the following will be helpful.

package android_programmers_guide.PhoneCallReceiver;
import java.lang.reflect.Method;
import com.android.internal.telephony.ITelephony;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.Toast;
public class PhoneCallReceiver extends BroadcastReceiver
{
    Context context = null;
    private static final String TAG = "THIRI THE WUT YEE";
    private ITelephony telephonyService;
    @Override
    public void onReceive(Context context, Intent intent) 
    {
        Log.v(TAG, "Receving....");
        TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);  
        try 
        {
            Class c = Class.forName(telephony.getClass().getName());
            Method m = c.getDeclaredMethod("getITelephony");
            m.setAccessible(true);
            telephonyService = (ITelephony) m.invoke(telephony);

            Toast tag = Toast.makeText(context, "Call is not allowed in the meeting!!!", Toast.LENGTH_LONG);
            tag.setDuration(25);
            tag.show();


            telephonyService.silenceRinger();
            telephonyService.endCall();
        } 
        catch (Exception e) 
        {
            e.printStackTrace();
        }

 }


}

-----> Here is interface class

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

----> And the Manifest is as follows

---> Honestly, I've found this code on the internet Cheers!