Android: Listen outgoing/incoming call 1, Listen outgoing call
Register a broadcast receiver with action android.intent.action.NEW_OUTGOING_CALL,
but please request to use permission android.permission.PROCESS_OUTGOING_CALLS. we can get outgoing phone number by calling
String strPhoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
in BroadcastReceiver.onReceive(xxx);


2, Listen incoming call
Use TelephonyManager and PhoneStateListener

import android.app.Activity;
import android.content.Context;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;

public class Telephony extends Activity
{
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
TelephonyManager mTelephonyMgr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
mTelephonyMgr.listen(new TeleListener(), PhoneStateListener.LISTEN_CALL_STATE);

setContentView(xxxxxxxx);
}

class TeleListener extends PhoneStateListener
{
public void onCallStateChanged(int state, String incomingNumber)
{
super.onCallStateChanged(state, incomingNumber);
switch (state)
{
case TelephonyManager.CALL_STATE_IDLE:
//CALL_STATE_IDLE;
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
//CALL_STATE_OFFHOOK;
break;
case TelephonyManager.CALL_STATE_RINGING:
//CALL_STATE_RINGING
break;
default:
break;
}
}

}
}

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