android 實現搖一搖功能

實現“搖一搖”功能，其實很簡單，就是檢測手機的重力感應，具體實現代碼如下： 一、在 AndroidManifest.xml 中添加操作權限 二、實現代碼

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;  
   
/** 
 * 安卓晃動手機監聽--“搖一搖” 
 *  
 * @author 單紅宇 
 *  
 */ 
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) {// 注冊監聽器  
            sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);  
            // 第一個參數是Listener，第二個參數是所得傳感器類型，第三個參數值獲取傳感器信息的頻率  
        }  
    }  
   
    @Override 
    protected void onPause() {  
        super.onPause();  
        if (sensorManager != null) {// 取消監聽器  
            sensorManager.unregisterListener(sensorEventListener);  
        }  
    }  
   
    /** 
     * 重力感應監聽 
     */ 
    private SensorEventListener sensorEventListener = new SensorEventListener() {  
   
        @Override 
        public void onSensorChanged(SensorEvent event) {  
            // 傳感器信息改變時執行該方法  
            float[] values = event.values;  
            float x = values[0]; // x軸方向的重力加速度，向右為正  
            float y = values[1]; // y軸方向的重力加速度，向前為正  
            float z = values[2]; // z軸方向的重力加速度，向上為正  
            Log.i(TAG, "x軸方向的重力加速度" + x +  "；y軸方向的重力加速度" + y +  "；z軸方向的重力加速度" + z);  
            // 一般在這三個方向的重力加速度達到40就達到了搖晃手機的狀態。  
            int medumValue = 19;// 三星 i9250怎么晃都不會超過20，沒辦法，只設置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) {  
   
        }  
    };  
   
    /** 
     * 動作執行 
     */ 
    Handler handler = new Handler() {  
   
        @Override 
        public void handleMessage(Message msg) {  
            super.handleMessage(msg);  
            switch (msg.what) {  
            case SENSOR_SHAKE:  
                Toast.makeText(TestSensorActivity.this, "檢測到搖晃，執行操作！", Toast.LENGTH_SHORT).show();  
                Log.i(TAG, "檢測到搖晃，執行操作！");  
                break;  
            }  
        }  
   
    };  
}  
這種搖一搖比較普通，沒有經過算法的加強，重力加速度就是10。
算法優化如下
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;//這個值調節靈敏度
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);//這里選擇感應頻率
       }
}
 
 
/**
* 重力感應監聽
*/
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;
// 傳感器信息改變時執行該方法
float[] values = event.values;
float x = values[0]; // x軸方向的重力加速度，向右為正
float y = values[1]; // y軸方向的重力加速度，向前為正
float z = values[2]; // z軸方向的重力加速度，向上為正
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) {
 
}
};
 
}