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) {

 }
 };

 }