Android 摇一摇功能

来源：互联网发布：天谕玉虚男捏脸数据编辑：程序博客网时间：2024/06/10 18:40

【转载自】：http://blog.csdn.net/forlong401/article/details/8205849 感谢博主精彩分享

http://www.2cto.com/kf/201210/159724.html

实现“摇一摇”功能，其实很简单，就是检测手机的重力感应，具体实现代码如下：

一、在 AndroidManifest.xml 中添加操作权限

<uses-permission android:name="android.permission.VIBRATE"/>

二、实现代码

[java]
package com.xs.test;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Vibrator;
import android.util.Log;
import android.widget.Toast;

/**
* 安卓晃动手机监听--“摇一摇”
*
* @author 单红宇
*
*/
public class TestSensorActivity extends Activity {

    private SensorManager sensorManager;
    private Vibrator vibrator;

    private static final String TAG = "TestSensorActivity";
    private static final int SENSOR_SHAKE = 10;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (sensorManager != null) {// 注册监听器
            sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
            // 第一个参数是Listener，第二个参数是所得传感器类型，第三个参数值获取传感器信息的频率
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (sensorManager != null) {// 取消监听器
            sensorManager.unregisterListener(sensorEventListener);
        }
    }

    /**
     * 重力感应监听
     */
    private SensorEventListener sensorEventListener = new SensorEventListener() {

        @Override
        public void onSensorChanged(SensorEvent event) {
            // 传感器信息改变时执行该方法
            float[] values = event.values;
            float x = values[0]; // x轴方向的重力加速度，向右为正
            float y = values[1]; // y轴方向的重力加速度，向前为正
            float z = values[2]; // z轴方向的重力加速度，向上为正
            Log.i(TAG, "x轴方向的重力加速度" + x + "；y轴方向的重力加速度" + y + "；z轴方向的重力加速度" + z);
            // 一般在这三个方向的重力加速度达到40就达到了摇晃手机的状态。
            int medumValue = 19;// 三星 i9250怎么晃都不会超过20，没办法，只设置19了
            if (Math.abs(x) > medumValue || Math.abs(y) > medumValue || Math.abs(z) > medumValue) {
                vibrator.vibrate(200);
                Message msg = new Message();
                msg.what = SENSOR_SHAKE;
                handler.sendMessage(msg);
            }
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }
    };

    /**
     * 动作执行
     */
    Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
            case SENSOR_SHAKE:
                Toast.makeText(TestSensorActivity.this, "检测到摇晃，执行操作！", Toast.LENGTH_SHORT).show();
                Log.i(TAG, "检测到摇晃，执行操作！");
                break;
            }
        }

    };
}

http://www.dewen.org/q/4573/android%E4%B8%AD%E5%A6%82%E4%BD%95%E5%BC%80%E5%8F%91%E6%91%87%E4%B8%80%E6%91%87%E7%9A%84%E5%BA%94%E7%94%A8%EF%BC%9F

摇一摇功能只使用到Sensor.TYPE_ACCELEROMETER加速度传感器

首先acticity要实现SensorEventListener接口

初始化传感器服务 mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

然后重写onSensorChanged方法根据时间类型和偏移值判断即可事件类型：event.sensor.getType() 偏移值 event.values

加速度传感器返回值的单位是加速度的单位 m/s^2(米每二次方秒)，有三个方向的值分别是
　　values[0]: x-axis 方向加速度
　　values[1]: y-axis 方向加速度
　　values[2]: z-axis 方向加速度
　　其中x,y,z方向的定义是以水平放置在的手机的右下脚为参照系坐标原点
　　x 方向就是手机的水平方向，右为正
　　y 方向就是手机的水平垂直方向，前为正
　　z方向就是手机的空间垂直方向，天空的方向为正，地心的方向为负

最后要注意在onStop() onPause()里注销传感器的服务 mSensorManager.unregisterListener(this);

onResume()里重载服务：//加速度传感器

mSensorManager.registerListener(this,

mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),

//还有SENSOR_DELAY_UI、SENSOR_DELAY_FASTEST、SENSOR_DELAY_GAME等，

//根据不同应用，需要的反应速率不同，具体根据实际情况设定

SensorManager.SENSOR_DELAY_NORMAL);

晃动检测是基于加速传感器的（Sensor.TYPE_ACCELEROMETER），其原理是通过监听加速度的变化来判断手机是否在晃动。那么如何计算加速的的变化呢？计算加速度的变化即在一个较短的时间间隔求出加速的的差值，然后将这个差值与一个指定的阈值进行比较，如果差值大于阈值则认为是手机发生了晃动。加速度具体的计算方法通常是将x,y,z方向的加速度差值加起来，但是这种方法并不是很准确，由于加速度是向量，更为精确的方法是将各方向的加速度差值的平方加起来再开方。当然如果有必要的话，从物理角度考虑，我们可以计算出加速度在某一方向（任意方向）的变化，这就需要大家再回顾下物理了。核心的原理说完了，直接看代码吧：

<ol class="linenums"><li class="L0"><span class="kwd">package</span><span class="pln"> zhengzhiren</span><span class="pun">.</span><span class="pln">android</span><span class="pun">.</span><span class="pln">hardware</span><span class="pun">;</span></li><li class="L2"><span class="pln"></span><span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">util</span><span class="pun">.</span><span class="typ">ArrayList</span><span class="pun">;</span></li><li class="L4"><span class="pln"></span><span class="kwd">import</span><span class="pln"> android</span><span class="pun">.</span><span class="pln">content</span><span class="pun">.</span><span class="typ">Context</span><span class="pun">;</span></li><li class="L6"><span class="pln"></span><span class="kwd">import</span><span class="pln"> android</span><span class="pun">.</span><span class="pln">hardware</span><span class="pun">.</span><span class="typ">Sensor</span><span class="pun">;</span></li><li class="L8"><span class="pln"></span><span class="kwd">import</span><span class="pln"> android</span><span class="pun">.</span><span class="pln">hardware</span><span class="pun">.</span><span class="typ">SensorEvent</span><span class="pun">;</span></li><li class="L0"><span class="pln"></span><span class="kwd">import</span><span class="pln"> android</span><span class="pun">.</span><span class="pln">hardware</span><span class="pun">.</span><span class="typ">SensorEventListener</span><span class="pun">;</span></li><li class="L2"><span class="pln"></span><span class="kwd">import</span><span class="pln"> android</span><span class="pun">.</span><span class="pln">hardware</span><span class="pun">.</span><span class="typ">SensorManager</span><span class="pun">;</span></li><li class="L4"><span class="pln"></span><span class="kwd">import</span><span class="pln"> android</span><span class="pun">.</span><span class="pln">util</span><span class="pun">.</span><span class="typ">FloatMath</span><span class="pun">;</span></li><li class="L6"><span class="pln"></span><span class="com">/**</span></li><li class="L8"><ul><li class="L9"><span class="com"></span></li><li><span class="com">用于检测手机摇晃</span><span class="com"></span></li><li class="L0"><span style="font-family: Arial;">*/</span><span class="com"></span></li></ul></li><li class="L8"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">ShakeDetector</span><span class="pln"> </span><span class="kwd">implements</span><span class="pln"> </span><span class="typ">SensorEventListener</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L9"><span class="pln"></span></li><li class="L0"><span class="pln"></span><span class="com">/**</span></li><li class="L2"><ul><li><span class="com">检测的时间间隔</span><span class="com"></span></li><li class="L4"></li></ul></li><li class="L6"><span class="com">*/</span></li><li class="L8"><span class="pln"></span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">final</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> UPDATE_INTERVAL </span><span class="pun">=</span><span class="pln"> </span><span class="lit">100</span><span class="pun">;</span><span class="pln"></span></li><li class="L9"><span class="pln"></span></li><li class="L0"><span class="pln"></span><span class="com">/**</span></li><li class="L2"><ul><li class="L3"><span class="com"></span></li><li><span class="com">上一次检测的时间</span><span class="com"></span></li><li class="L4"><span class="com"></span></li></ul></li><li class="L5"><span class="com"></span></li><li class="L6"><span class="com">*/</span></li><li class="L8"><span class="pln"></span><span class="kwd">long</span><span class="pln"> mLastUpdateTime</span><span class="pun">;</span></li><li class="L0"><span class="pln"></span><span class="com">/**</span></li><li class="L2"><ul><li class="L3"><span class="com"></span></li><li><span class="com">上一次检测时，加速度在x、y、z方向上的分量，用于和当前加速度比较求差。</span><span class="com"></span></li><li class="L4"><span class="com"></span></li></ul></li><li class="L5"><span class="com"></span></li><li class="L6"><span class="com">*/</span></li><li class="L8"><span class="pln"></span><span class="kwd">float</span><span class="pln"> mLastX</span><span class="pun">,</span><span class="pln"> mLastY</span><span class="pun">,</span><span class="pln"> mLastZ</span><span class="pun">;</span></li><li class="L0"><span class="pln"></span><span class="typ">Context</span><span class="pln"> mContext</span><span class="pun">;</span></li><li class="L2"><span class="pln"></span><span class="typ">SensorManager</span><span class="pln"> mSensorManager</span><span class="pun">;</span></li><li class="L4"><span class="pln"></span><span class="typ">ArrayList</span><span class="pun"><</span><span class="typ">OnShakeListener</span><span class="pun">></span><span class="pln"> mListeners</span><span class="pun">;</span></li><li class="L6"><span class="pln"></span><span class="com">/**</span></li><li class="L8"><ul><li><span class="com">摇晃检测阈值，决定了对摇晃的敏感程度，越小越敏感。</span><span class="com"></span></li><li class="L0"><span class="com"></span></li></ul></li><li class="L1"><span class="com"></span></li><li class="L2"><span class="com">*/</span></li><li class="L4"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> shakeThreshold </span><span class="pun">=</span><span class="pln"> </span><span class="lit">5000</span><span class="pun">;</span></li><li class="L6"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="typ">ShakeDetector</span><span class="pun">(</span><span class="typ">Context</span><span class="pln"> context</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span></li><li class="L8"><span class="pln">mContext </span><span class="pun">=</span><span class="pln"> context</span><span class="pun">;</span></li><li class="L0"><span class="pln">mSensorManager </span><span class="pun">=</span><span class="pln"> </span><span class="pun">(</span><span class="typ">SensorManager</span><span class="pun">)</span><span class="pln"> context</span></li><li class="L2"><span class="pln"></span><span class="pun">.</span><span class="pln">getSystemService</span><span class="pun">(</span><span class="typ">Context</span><span class="pun">.</span><span class="pln">SENSOR_SERVICE</span><span class="pun">);</span><span class="pln"></span></li><li class="L3"><span class="pln"></span></li><li class="L4"><span class="pln">mListeners </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">ArrayList</span><span class="pun"><</span><span class="typ">OnShakeListener</span><span class="pun">>();</span><span class="pln"></span></li><li class="L5"><span class="pln"></span></li><li class="L6"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L7"><span class="pln"></span></li><li class="L8"><span class="pln"></span><span class="com">/**</span></li><li class="L0"><ul><li><span class="com">当摇晃事件发生时，接收通知</span><span class="com"></span></li><li class="L2"><span class="com"></span></li></ul></li><li class="L3"><span class="com"></span></li><li class="L4"><span class="com">*/</span><span class="pln"></span></li><li class="L5"><span class="pln"></span></li><li class="L6"><span class="pln"></span><span class="kwd">public</span><span class="pln"> interface </span><span class="typ">OnShakeListener</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L7"><span class="pln"></span></li><li class="L8"><span class="pln"></span><span class="com">/**</span></li><li class="L0"><ul><li><span class="com">当手机摇晃时被调用</span><span class="com"></span></li><li class="L2"></li></ul></li><li class="L4"><span class="com">*/</span></li><li class="L6"><span class="pln"></span><span class="kwd">void</span><span class="pln"> onShake</span><span class="pun">();</span></li><li class="L8"><span class="pln"></span><span class="pun">}</span></li><li class="L0"><span class="pln"></span><span class="com">/**</span></li><li class="L2"><ul><li class="L3"><span class="com"></span></li><li><span class="com">注册OnShakeListener，当摇晃时接收通知</span><span class="com"></span></li><li class="L4"></li></ul></li><li class="L6"><span class="com">*</span><span style="font-family: Arial;">*/</span></li><li class="L1"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> registerOnShakeListener</span><span class="pun">(</span><span class="typ">OnShakeListener</span><span class="pln"> listener</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span></li><li class="L3"><span class="pln"></span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">mListeners</span><span class="pun">.</span><span class="pln">contains</span><span class="pun">(</span><span class="pln">listener</span><span class="pun">))</span></li><li class="L5"><span class="pln"></span><span class="kwd">return</span><span class="pun">;</span></li><li class="L7"><span class="pln">mListeners</span><span class="pun">.</span><span class="pln">add</span><span class="pun">(</span><span class="pln">listener</span><span class="pun">);</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="pun">}</span></li><li class="L1"><span class="pln"></span><span class="com">/**</span></li><li class="L3"><ul><li class="L4"><span class="com"></span></li><li><span class="com">移除已经注册的OnShakeListener</span><span class="com"></span></li><li class="L5"><span class="com"></span></li></ul></li><li class="L6"><span class="com"></span></li><li class="L7"><span class="com">*</span></li><li class="L9"><span class="com">*</span></li><li class="L1"><span class="com">*/</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> unregisterOnShakeListener</span><span class="pun">(</span><span class="typ">OnShakeListener</span><span class="pln"> listener</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln">mListeners</span><span class="pun">.</span><span class="pln">remove</span><span class="pun">(</span><span class="pln">listener</span><span class="pun">);</span></li><li class="L7"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="com">/**</span></li><li class="L1"><ul><li><span class="com">启动摇晃检测</span><span class="com"></span></li><li class="L3"></li></ul></li><li class="L5"><span class="com">*/</span></li><li class="L7"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> start</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span></li><li class="L9"><span class="pln"></span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">mSensorManager </span><span class="pun">==</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="kwd">throw</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">UnsupportedOperationException</span><span class="pun">();</span></li><li class="L3"><span class="pln"></span><span class="pun">}</span></li><li class="L5"><span class="pln"></span><span class="typ">Sensor</span><span class="pln"> sensor </span><span class="pun">=</span><span class="pln"> mSensorManager</span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="pun">.</span><span class="pln">getDefaultSensor</span><span class="pun">(</span><span class="typ">Sensor</span><span class="pun">.</span><span class="pln">TYPE_ACCELEROMETER</span><span class="pun">);</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">sensor </span><span class="pun">==</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="kwd">throw</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">UnsupportedOperationException</span><span class="pun">();</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln"></span><span class="kwd">boolean</span><span class="pln"> success </span><span class="pun">=</span><span class="pln"> mSensorManager</span><span class="pun">.</span><span class="pln">registerListener</span><span class="pun">(</span><span class="kwd">this</span><span class="pun">,</span><span class="pln"> sensor</span><span class="pun">,</span><span class="pln"></span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="typ">SensorManager</span><span class="pun">.</span><span class="pln">SENSOR_DELAY_GAME</span><span class="pun">);</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(!</span><span class="pln">success</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="kwd">throw</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">UnsupportedOperationException</span><span class="pun">();</span></li><li class="L3"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="com">/**</span></li><li class="L9"><ul><li><span class="com">停止摇晃检测</span><span class="com"></span></li><li class="L1"></li></ul></li><li class="L3"><span class="com">*/</span></li><li class="L5"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> stop</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">mSensorManager </span><span class="pun">!=</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">)</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln">mSensorManager</span><span class="pun">.</span><span class="pln">unregisterListener</span><span class="pun">(</span><span class="kwd">this</span><span class="pun">);</span></li><li class="L1"><span class="pln"></span><span class="pun">}</span></li><li class="L3"><span class="pln"></span><span class="lit">@Override</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> onAccuracyChanged</span><span class="pun">(</span><span class="typ">Sensor</span><span class="pln"> sensor</span><span class="pun">,</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> accuracy</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="com">// TODO Auto-generated method stub</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="pun">}</span></li><li class="L1"><span class="pln"></span><span class="lit">@Override</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> onSensorChanged</span><span class="pun">(</span><span class="typ">SensorEvent</span><span class="pln"> event</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln"></span><span class="kwd">long</span><span class="pln"> currentTime </span><span class="pun">=</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="pln">currentTimeMillis</span><span class="pun">();</span><span class="pln"></span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="kwd">long</span><span class="pln"> diffTime </span><span class="pun">=</span><span class="pln"> currentTime </span><span class="pun">-</span><span class="pln"> mLastUpdateTime</span><span class="pun">;</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">diffTime </span><span class="pun">></span><span class="pln"> UPDATE_INTERVAL</span><span class="pun">){</span><span class="pln"></span></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="kwd">if</span><span class="pun">(</span><span class="pln">mLastUpdateTime</span><span class="pun">!=</span><span class="lit">0</span><span class="pun">){</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="kwd">float</span><span class="pln"> x </span><span class="pun">=</span><span class="pln"> event</span><span class="pun">.</span><span class="pln">values</span><span class="pun">[</span><span class="lit">0</span><span class="pun">];</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln"></span><span class="kwd">float</span><span class="pln"> y </span><span class="pun">=</span><span class="pln"> event</span><span class="pun">.</span><span class="pln">values</span><span class="pun">[</span><span class="lit">1</span><span class="pun">];</span><span class="pln"></span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="kwd">float</span><span class="pln"> z </span><span class="pun">=</span><span class="pln"> event</span><span class="pun">.</span><span class="pln">values</span><span class="pun">[</span><span class="lit">2</span><span class="pun">];</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="kwd">float</span><span class="pln"> deltaX </span><span class="pun">=</span><span class="pln"> x </span><span class="pun">-</span><span class="pln"> mLastX</span><span class="pun">;</span><span class="pln"></span></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="kwd">float</span><span class="pln"> deltaY </span><span class="pun">=</span><span class="pln"> y </span><span class="pun">-</span><span class="pln"> mLastY</span><span class="pun">;</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="kwd">float</span><span class="pln"> deltaZ </span><span class="pun">=</span><span class="pln"> z </span><span class="pun">–</span><span class="pln"> mLastZ</span><span class="pun">;</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln"></span><span class="kwd">float</span><span class="pln"> delta </span><span class="pun">=</span><span class="pln"> </span><span class="typ">FloatMath</span><span class="pun">.</span><span class="pln">sqrt</span><span class="pun">(</span><span class="pln">deltaX </span><span class="pun">*</span><span class="pln"> deltaX </span><span class="pun">+</span><span class="pln"> deltaY </span><span class="pun">*</span><span class="pln"> deltaY </span><span class="pun">+</span><span class="pln"> deltaZ</span></li><li class="L7"><ul><li><span class="pln">deltaZ</span><span class="pun">)</span><span class="pln"></span></li><li class="L9"><span class="pln"></span></li></ul></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="pun">/</span><span class="pln"> diffTime </span><span class="pun">*</span><span class="pln"> </span><span class="lit">10000</span><span class="pun">;</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">delta </span><span class="pun">></span><span class="pln"> shakeThreshold</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="com">// 当加速度的差值大于指定的阈值，认为这是一个摇晃</span></li><li class="L5"><span class="pln"></span><span class="kwd">this</span><span class="pun">.</span><span class="pln">notifyListeners</span><span class="pun">();</span></li><li class="L7"><span class="pln"></span><span class="pun">}</span></li><li class="L9"><span class="pln">mLastX </span><span class="pun">=</span><span class="pln"> x</span><span class="pun">;</span></li><li class="L1"><span class="pln">mLastY </span><span class="pun">=</span><span class="pln"> y</span><span class="pun">;</span></li><li class="L3"><span class="pln">mLastZ </span><span class="pun">=</span><span class="pln"> z</span><span class="pun">;</span></li><li class="L5"><span class="pln">mLastUpdateTime </span><span class="pun">=</span><span class="pln"> currentTime</span><span class="pun">;</span></li><li class="L7"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L8"><span class="pln"></span></li><li class="L9"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="pun">}</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="com">/**</span></li><li class="L5"><ul><li class="L6"><span class="com"></span></li><li><span class="com">当摇晃事件发生时，通知所有的listener</span><span class="com"></span></li><li class="L7"></li></ul></li><li class="L9"><span class="com">*/</span><span class="pln"></span></li><li class="L0"><span class="pln"></span></li><li class="L1"><span class="pln"></span><span class="kwd">private</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> notifyListeners</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L2"><span class="pln"></span></li><li class="L3"><span class="pln"></span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="typ">OnShakeListener</span><span class="pln"> listener </span><span class="pun">:</span><span class="pln"> mListeners</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"></span></li><li class="L4"><span class="pln"></span></li><li class="L5"><span class="pln">listener</span><span class="pun">.</span><span class="pln">onShake</span><span class="pun">();</span><span class="pln"></span></li><li class="L6"><span class="pln"></span></li><li class="L7"><span class="pln"></span><span class="pun">}</span></li><li class="L9"><span class="pln"></span><span class="pun">}</span></li><li class="L1"><span class="pln"></span><span class="pun">}</span></li></ol>

如何使用ShakeDetector：

new一个ShakeDetector
调用mShakeDetector.registerOnShakeListener()注册一个OnShakeListener
在OnShakeListener的onShake函数中，处理摇晃事件
调用mShakeDetector.start()启动摇晃检测
mShakeDetector.stop()用于停止摇晃检测

0 0