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

[java] view
plaincopy

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) {
  
  
  
  }
  
  };
  
  
  
  }