android2.3以上自动接听来电
因为Android2.3以上增加了对permission ?android.permission.MODIFY_PHONE_STATE 的限制，2.3之前的通过反射机制调用ITelephone的能力的做法已经不适用
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2.3上实现方式：
public synchronized void answerRingingCall() {// 据说该方法只能用于Android2.3及2.3以上的版本上try {Intent localIntent1 = new Intent(Intent.ACTION_HEADSET_PLUG);localIntent1.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);localIntent1.putExtra("state", 1);localIntent1.putExtra("microphone", 1);localIntent1.putExtra("name", "Headset");sendOrderedBroadcast(localIntent1,"android.permission.CALL_PRIVILEGED");Intent localIntent2 = new Intent(Intent.ACTION_MEDIA_BUTTON);KeyEvent localKeyEvent1 = new KeyEvent(KeyEvent.ACTION_DOWN,KeyEvent.KEYCODE_HEADSETHOOK);localIntent2.putExtra("android.intent.extra.KEY_EVENT",localKeyEvent1);sendOrderedBroadcast(localIntent2,"android.permission.CALL_PRIVILEGED");Intent localIntent3 = new Intent(Intent.ACTION_MEDIA_BUTTON);KeyEvent localKeyEvent2 = new KeyEvent(KeyEvent.ACTION_UP,KeyEvent.KEYCODE_HEADSETHOOK);localIntent3.putExtra("android.intent.extra.KEY_EVENT",localKeyEvent2);sendOrderedBroadcast(localIntent3,"android.permission.CALL_PRIVILEGED");Intent localIntent4 = new Intent(Intent.ACTION_HEADSET_PLUG);localIntent4.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);localIntent4.putExtra("state", 0);localIntent4.putExtra("microphone", 1);localIntent4.putExtra("name", "Headset");sendOrderedBroadcast(localIntent4,"android.permission.CALL_PRIVILEGED");} catch (Exception e) {e.printStackTrace();}}?