android 電話接通時震動

電話接通時震動功能，亦可進一步做成系統設定選項，用preference實現。

package com.android.phone;

import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneBase;
import com.android.internal.telephony.gsm.SuppServiceNotification;
import com.android.phone.CdmaDisplayInfo;
import com.android.phone.NotificationMgr;
import com.android.phone.CallNotifier.InCallTonePlayer;

import android.os.AsyncResult;
import android.os.Message;
import android.util.Log;

//來電入口類
public class CallNotifier extends Handler implements CallerInfoAsyncQuery.OnQueryCompleteListener {

//儲存上一狀態
    private Call.State mPreviousCallState;

private void onNewRingingConnection(AsyncResult r) {
    }

//處理通話狀態message
    @Override
public void handleMessage(Message msg) {
switch (msg.what) {
//other
            case PHONE_STATE_CHANGED:
                onPhoneStateChanged((AsyncResult) msg.obj);
break;
//other
        }
    }

//通話狀態改變時
    private void onPhoneStateChanged(AsyncResult r) {
//other
//判斷來電狀態，若剛接通則震動
        if ((mPhone.getForegroundCall().getState() == Call.State.ACTIVE) 
                && ((mPreviousCallState == Call.State.DIALING) || (mPreviousCallState == Call.State.ALERTING))) {
            Vibrator vbr = (Vibrator) mPhone.getContext().getSystemService(Context.VIBRATOR_SERVICE);
            vbr.vibrate(200);
        } 
        mPreviousCallState = mPhone.getForegroundCall().getState();
    }
}