android系统自带的振动器以及倒计时器

1.系统自带的振动器

private Vibrator mVibrator;
...
// 使用系统服务检索振动器
mVibrator = (Vibrator) mContext.getSystemService(Context.VIBRATOR_SERVICE);
...
mVibrator.vibrate(200);// 振动0.2秒

1.系统自带的倒计时器

/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0 *
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.tts.hotelmanager.utils;

import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;

/**
* Schedule a countdown until a time in the future, with
* regular notifications on intervals along the way.
*
* Example of showing a 30 second countdown in a text field:
*
* <pre class="prettyprint">
* new CountDownTimer(30000, 1000) {
*
*     public void onTick(long millisUntilFinished) {
*         mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
*     }
*
*     public void onFinish() {
*         mTextField.setText("done!");
*     }
*  }.start();
* </pre>
*
* The calls to {@link #onTick(long)} are synchronized to this object so that
* one call to {@link #onTick(long)} won't ever occur before the previous
* callback is complete.  This is only relevant when the implementation of
* {@link #onTick(long)} takes an amount of time to execute that is significant
* compared to the countdown interval.
*/
public abstract class CountDownTimerUtil {

/**
* Millis since epoch when alarm should stop.
*/
private final long mMillisInFuture;

/**
* The interval in millis that the user receives callbacks
*/
private final long mCountdownInterval;

private long mStopTimeInFuture;

/**
* boolean representing if the timer was cancelled
*/
private boolean mCancelled = false;

/**
* @param millisInFuture The number of millis in the future from the call
*   to {@link #start()} until the countdown is done and {@link #onFinish()}
*   is called.
* @param countDownInterval The interval along the way to receive
*   {@link #onTick(long)} callbacks.
*/
public CountDownTimerUtil(long millisInFuture, long countDownInterval) {
mMillisInFuture = millisInFuture;
mCountdownInterval = countDownInterval;
}

/**
* Cancel the countdown.
*/
public synchronized final void cancel() {
mCancelled = true;
mHandler.removeMessages(MSG);
}

/**
* Start the countdown.
*/
public synchronized final CountDownTimerUtil start() {
mCancelled = false;
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
mHandler.sendMessage(mHandler.obtainMessage(MSG));
return this;
}

/**
* Callback fired on regular interval.
* @param millisUntilFinished The amount of time until finished.
*/
public abstract void onTick(long millisUntilFinished);

/**
* Callback fired when the time is up.
*/
public abstract void onFinish();

private static final int MSG = 1;

// handles counting down
private Handler mHandler = new Handler() {

@Override
public void handleMessage(Message msg) {

synchronized (CountDownTimerUtil.this) {
if (mCancelled) {
return;
}

final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();

if (millisLeft <= 0) {
onFinish();
} else if (millisLeft < mCountdownInterval) {
// no tick, just delay until done
sendMessageDelayed(obtainMessage(MSG), millisLeft);
} else {
long lastTickStart = SystemClock.elapsedRealtime();
onTick(millisLeft);

// take into account user's onTick taking time to execute
long delay = lastTickStart + mCountdownInterval - SystemClock.elapsedRealtime();

// special case: user's onTick took more than interval to
// complete, skip to next interval
while (delay < 0) delay += mCountdownInterval;

sendMessageDelayed(obtainMessage(MSG), delay);
}
}
}
};
}

/**
* 设计多次连接倒计时器
*/
public static void setCountDownTimerUtil() {

mCountDownTimerUtil = new CountDownTimerUtil(1000, 200) {

/**
* 每隔200毫秒之后进行的操作
*/
@SuppressLint("InlinedApi")
public void onTick(long millisUntilFinished) {

mBluetoothManager = (BluetoothManager) mContext.getSystemService(Context.BLUETOOTH_SERVICE);
mAdapter = mBluetoothManager.getAdapter();
device = mAdapter.getRemoteDevice(mDeviceAddress);
if (device != null) {
// 取消扫描蓝牙设备
mAdapter.cancelDiscovery();
}
mBluetoothGatt = device.connectGatt(mContext, false, myCallBack);
}

/**
* 1000毫秒过去后进行的操作
*/
public void onFinish() {

// 取消倒计数器
mCountDownTimerUtil.cancel();
// // 取消连接周边设备
// disconnectRemoteDevice(mBluetoothGatt);
}
};

// 启动倒计时器
mCountDownTimerUtil.start();
}