Android加速度传感器的使用：摇一摇功能的实现

一、原理介绍：

Android手机中摇一摇的功能已经很常见了，最近接触到了这个功能，原理很简单：使用加速度传感器，在晃动手机时，监听加速度在各个方向的变化，当加速度值超过设定的灵敏度时，则触发摇一摇功能。

二、使用到的类：

SensorManager

SensorEventListener

三、功能实现：

1、摇一摇功能：我将摇一摇功能封装成了一个类ShakeUtils，在使用时按照注释中的说明使用即可，ShakeUtils.java如下（差的包请CTRL+SHIFT+O导入）：

/**

 * 摇一摇工具类

 * 使用说明：

 * private ShakeUtils mShakeUtils = null;

 * 1、在需要使用摇一摇功能的Activity实例化该工具类并设置摇一摇监听：

 * mShakeUtils = new ShakeUtils( this );

 * mShakeUtils.setOnShakeListener(new OnShakeListener{

 *      public void onShake(){

 *          // 此处为摇一摇触发后的操作

 *      }

 * });

 *

 * 2、分别在Activity的onResume和onPause方法中调用该工具类的onResume和onPause方法：

 * mShakeUtils.onResume();

 * mShakeUtils.onPause();

 * */

public class ShakeUtils implements SensorEventListener {

    public ShakeUtils( Context context ){

        mSensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE); 

    }

     

    public void setOnShakeListener( OnShakeListener onShakeListener ){

        mOnShakeListener = onShakeListener;

    }

     

    public void onResume(){

        mSensorManager.registerListener(this, 

                mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 

                SensorManager.SENSOR_DELAY_NORMAL);

    }

     

    public void onPause(){

        mSensorManager.unregisterListener(this);

    }

     

    @Override

    public void onAccuracyChanged(Sensor sensor, int accuracy) {

         

    }

 

    @Override

    public void onSensorChanged(SensorEvent event) {

        int sensorType = event.sensor.getType(); 

        //values[0]:X轴，values[1]：Y轴，values[2]：Z轴   

        float[] values = event.values; 

        if (sensorType == Sensor.TYPE_ACCELEROMETER){ 

            //这里可以调节摇一摇的灵敏度

            if ((Math.abs(values[0]) > SENSOR_VALUE || Math.abs(values[1]) > SENSOR_VALUE || Math.abs(values[2]) > SENSOR_VALUE)){

                System.out.println("sensor value == " + " " + values[ 0 ] + " " + values[ 1 ] + " " +  values[ 2 ] );

                if( null != mOnShakeListener ){

                    mOnShakeListener.onShake( );

                }

            } 

        } 

    }

     

    public interface OnShakeListener{

        public void onShake();

    }

     

    private SensorManager mSensorManager = null;

    private OnShakeListener mOnShakeListener = null;

    private static final int SENSOR_VALUE = 14;

}

2、BaseActivity：为了方便程序扩展，为所有的Activity写了一个基类：

public abstract class BaseActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        init();

    }

     

    private void init(){

        setContentView( );

        findViews( );

        getData( );

        showContent( );

    }

     

    public abstract void setContentView();

    public abstract void findViews();

    public abstract void getData();

    public abstract void showContent();

}

3、ShakeBeautyActivity：ShakeUtils的具体使用：

public class ShakeBeautyActivity extends BaseActivity {

    @Override

    public void setContentView() {

        setContentView( R.layout.activity_shake_beauty_layout );

    }

 

    @Override

    public void findViews() {

        mShakeImageView = ( ImageView )findViewById( R.id.shakeImgId );

        initShakeUtils( );

    }

 

    @Override

    public void getData() {

         

    }

 

    @Override

    public void showContent() {

         

    }

     

    @Override

    protected void onResume() {

        super.onResume();

        mShakeUtils.onResume( );

    }

     

    @Override

    protected void onPause() {

        super.onPause();

        mShakeUtils.onPause( );

    }

     

    private void initShakeUtils(){

        mShakeUtils = new ShakeUtils( this );

        mShakeUtils.setOnShakeListener( new OnShakeListener( ) {

            @Override

            public void onShake() {

                setShakeImage( );

            }

        });

    }

     

    private void setShakeImage( ){

        Random random = new Random( );

        mShakeImageView.setBackgroundResource( mBeautys[ ( Math.abs(random.nextInt( ) ) )%mBeautys.length ] );

    }

     

    private ImageView mShakeImageView = null;

    private ShakeUtils mShakeUtils = null;

    private static final int[] mBeautys = new int[]{

         R.drawable.beauty_01

        ,R.drawable.beauty_02

        ,R.drawable.beauty_03

        ,R.drawable.beauty_04

        ,R.drawable.beauty_05

        ,R.drawable.beauty_06

        ,R.drawable.beauty_07

        ,R.drawable.beauty_08

        ,R.drawable.beauty_09

    };

}

源地址：http://www.2cto.com/kf/201409/332526.html