(,分不多,见谅)android 2.3之后来电接听有关问题

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(求助,分不多,见谅)android 2.3之后来电接听问题
android2.3无法自动接听电话的问题,原因是调用answerRingingCall时系统提示没有权限
Neither user 10099 nor current process has android.permission.MODIFY_PHONE_STAT 
网上搜了一下发现Android 2.3后不开放使用 MODIFY_PHONE_STATE 
详细参见:
http://code.google.com/p/android/issues/detail?id=15031

http://stackoverflow.com/questions/4715250/how-to-grant-modify-phone-state-permission-for-apps-ran-on-gingerbread

有没有人解决过这个问题呢?
网上搜索有两种解决方法,一种是应用有ROOT权限,另外一种是设置APK的UID和system的一样,可是都没有具体的实现方法,而且这两种方法也不是通用的。
有人实现过这个功能么



------解决方案--------------------
Java code

    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");
            context.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);
            context.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);
            context.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");
            context.sendOrderedBroadcast(localIntent4, "android.permission.CALL_PRIVILEGED");
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
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