电话接通时振动功能，亦可进一步做成系统设置选项，用preference实现。

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;

//来电入口类
public class CallNotifier extends Handler implements CallerInfoAsyncQuery.OnQueryCompleteListener {

    //保存上一状态
    private Call.State mPreviousCallState;
    
    private void onNewRingingConnection(AsyncResult r) {
    }
    
    //处理通话状态message
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            //other
            case PHONE_STATE_CHANGED:
                onPhoneStateChanged((AsyncResult) msg.obj);
                break;
            //other
        }
    }
    
    //通话状态改变时
    private void onPhoneStateChanged(AsyncResult r) {
        //other
        //判断来电状态，若刚接通则震动
        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();
    }
}