Android 2.3以上自動接聽來電

因為Android2.3以上增加了對permission  android.permission.MODIFY_PHONE_STATE 的限制，2.3之前的通過反射機制調用ITelephone的能力的做法已經不適用

2.3上實現方式：

1. public synchronized void answerRingingCall() {   
2.         // 據說該方法只能用於Android2.3及2.3以上的版本上   
3.         try {   
4.             Intent localIntent1 = new Intent(Intent.ACTION_HEADSET_PLUG);   
5.             localIntent1.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);   
6.             localIntent1.putExtra("state", 1);   
7.             localIntent1.putExtra("microphone", 1);   
8.             localIntent1.putExtra("name", "Headset");   
9.             sendOrderedBroadcast(localIntent1,   
10.                     "android.permission.CALL_PRIVILEGED");   
11.             Intent localIntent2 = new Intent(Intent.ACTION_MEDIA_BUTTON);   
12.             KeyEvent localKeyEvent1 = new KeyEvent(KeyEvent.ACTION_DOWN,   
13.                     KeyEvent.KEYCODE_HEADSETHOOK);   
14.             localIntent2.putExtra("android.intent.extra.KEY_EVENT",   
15.                     localKeyEvent1);   
16.             sendOrderedBroadcast(localIntent2,   
17.                     "android.permission.CALL_PRIVILEGED");   
18.             Intent localIntent3 = new Intent(Intent.ACTION_MEDIA_BUTTON);   
19.             KeyEvent localKeyEvent2 = new KeyEvent(KeyEvent.ACTION_UP,   
20.                     KeyEvent.KEYCODE_HEADSETHOOK);   
21.             localIntent3.putExtra("android.intent.extra.KEY_EVENT",   
22.                     localKeyEvent2);   
23.             sendOrderedBroadcast(localIntent3,   
24.                     "android.permission.CALL_PRIVILEGED");   
25.             Intent localIntent4 = new Intent(Intent.ACTION_HEADSET_PLUG);   
26.             localIntent4.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);   
27.             localIntent4.putExtra("state", 0);   
28.             localIntent4.putExtra("microphone", 1);   
29.             localIntent4.putExtra("name", "Headset");   
30.             sendOrderedBroadcast(localIntent4,   
31.                     "android.permission.CALL_PRIVILEGED");   
32.         } catch (Exception e) {   
33.             e.printStackTrace();   
34.         }   
35.     }