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) {
}
};
}</pre>