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：

1、在 AndroidManifest.xml 中添加操作权限

2、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; 
 
public class TestSensorActivity extends Activity { 
  private SensorManager sensorManager; 
  private Vibrator vibrator; 
  private static final String TAG = "TestSensorActivity"; 
  private static final int SENSOR_SHAKE = 10; 
   
  @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); 
    } 
  } 
   
  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) { 
    } 
  }; 
   
  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
    }
}

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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