Java tutorial
//package com.java2s; import android.content.Context; import android.media.AudioManager; public class Main { /** * Call checker * @param context * @return true if a call is going on. */ public static boolean isACallActive(Context context) { AudioManager manager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); if (manager.getMode() == AudioManager.MODE_IN_CALL) { return true; } else { return false; } } }