android 实现摇一摇功能

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 二、实现代码

 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 onPause() {  
        super.onPause();  
        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;  
            }  
        }  
  
    };  
}  
这种摇一摇比较普通，没有经过算法的加强，重力加速度就是10。
算法优化如下
package com.example.url;


import java.io.IOException;
import java.net.URL;


import com.hahashijie.imageload.ImageLoader;


import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
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.ImageView;


@SuppressLint("HandlerLeak")
public class MainActivity extends Activity {


private ImageView image;
private SensorManager sensorManager;
private Sensor sensor;
private Vibrator vibrator;
private static final int UPTATE_INTERVAL_TIME = 50;
private static final int SPEED_SHRESHOLD = 30;//这个值调节灵敏度
private long lastUpdateTime;
private float lastX;
private float lastY;
private float lastZ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
image = (ImageView) findViewById(R.id.image);


}


@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
if (sensorManager != null) {
           sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
       }
       if (sensor != null) {
        sensorManager.registerListener(sensorEventListener,
        sensor,
SensorManager.SENSOR_DELAY_GAME);//这里选择感应频率
       }
}


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


@Override
public void onSensorChanged(SensorEvent event) {
long currentUpdateTime = System.currentTimeMillis();
long timeInterval = currentUpdateTime - lastUpdateTime;
if (timeInterval < UPTATE_INTERVAL_TIME) {
return;
}
lastUpdateTime = currentUpdateTime;
// 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
float deltaX = x - lastX;
float deltaY = y - lastY;
float deltaZ = z - lastZ;


lastX = x;
lastY = y;
lastZ = z;
double speed = (Math.sqrt(deltaX * deltaX + deltaY * deltaY
+ deltaZ * deltaZ) / timeInterval) * 100;
if (speed >= SPEED_SHRESHOLD) {
vibrator.vibrate(300);
image.setImageResource(R.drawable.running01);
}
}


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

}
};

}

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