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

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

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) {  } };  }