引言：

今天，在修改闹钟的一个bug，发现了在时钟(android 5.0)设置中有一个摇动行为设置项，主要是针对闹钟响铃声时，如果我们不想起床，可以通过设置摇动手机来关闭铃声或者延时多长时间再响闹铃。

主要原理

(1)启动一个service，中service中监听摇动手机的操作。

(2)在服务中，注册一个SensorEventListener监听事件，处理Sensor.TYPE_ACCELEROMETER.

当摇动手机，触发摇动事件时，进行相应的事件操作。

这个触发摇动事件的触发值是SENSITIVITY，我们可以调节这个值来调整触发摇动事件的敏感度。

触发摇动手机事件后，进行相对应的操作 handleShakeAction()，我只是弹出了一个Toase，你可以写自己想做的任务操作。

核心代码

(1)ShakeService—–监听摇动手机的服务

package com.example.shakefunction;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class ShakeService extends Service{

    public static final String TAG = "ShakeService";
    private SensorManager mSensorManager;

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        mSensorManager.unregisterListener(mShakeListener);
    }

    @Override
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub
        super.onStart(intent, startId);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        mSensorManager.registerListener(mShakeListener,
                mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
                //SensorManager.SENSOR_DELAY_GAME,
                50 * 1000); //batch every 50 milliseconds

        return super.onStartCommand(intent, flags, startId);
    }

    private final SensorEventListener mShakeListener = new SensorEventListener() {
        private static final float SENSITIVITY = 16;
        private static final int BUFFER = 5;
        private float[] gravity = new float[3];
        private float average = 0;
        private int fill = 0;

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

        public void onSensorChanged(SensorEvent event) {
            final float alpha = 0.8F;

            for (int i = 0; i < 3; i++) {
                gravity[i] = alpha * gravity[i] + (1 - alpha) * event.values[i];
            }

            float x = event.values[0] - gravity[0];
            float y = event.values[1] - gravity[1];
            float z = event.values[2] - gravity[2];

            if (fill <= BUFFER) {
                average += Math.abs(x) + Math.abs(y) + Math.abs(z);
                fill++;
            } else {
                Log.i(TAG, "average:"+average);
                Log.i(TAG, "average / BUFFER:"+(average / BUFFER));
                if (average / BUFFER >= SENSITIVITY) {
                    handleShakeAction();
                }
                average = 0;
                fill = 0;
            }
        }
    };

    protected void handleShakeAction() {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "shake success", Toast.LENGTH_LONG).show();
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
}

(2)在主界面中启动和关闭ShakeService

Intent intent = new Intent();
intent.setClass(this, ShakeService.class); 

if(view == startService){
    startService(intent);
}else if(view == stopService){
    stopService(intent);
}

(3)在AndroidManifest.xml定义ShakeService

<service android:name=".ShakeService"
         android:exported="false">
</service>

源码下载

http://download.csdn.net/detail/hfreeman2008/8970759

版权声明：本文为博主原创文章，未经博主允许不得转载。