gsensor即时数据的apk && 用gsensor来判断手机的静和动 && 手机摇一摇 &&气压计的测试应用

即时显示gsensor的数据，可以在调试重力感应器驱动和测试手机性能时起到很好的作用。类似的，SensorEventListener还可以用在其他感应器的场合，比如光感应、地磁感应。

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class Activity01 extends Activity implements SensorEventListener{     //在继承activity类的同时使用listsen接口
	private final String TAG = "zhangcheng";
	private SensorManager mSensorManager;
	private Sensor sensor;
	private float mLastX,mLastY,mLastZ;
	private String sX,sY,sZ;
	
	private TextView mTextViewX = null;
	private TextView mTextViewY = null;
	private TextView mTextViewZ = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activity01);
        
        mTextViewX = (TextView)findViewById(R.id.TextView1);
        mTextViewY = (TextView)findViewById(R.id.TextView2);
        mTextViewZ = (TextView)findViewById(R.id.TextView3);    //绑定显示控件句柄
        
        mSensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
        sensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        
        if(mSensorManager == null){
			Log.i(TAG,"sensor not supported");
	}
	mSensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL);
     }
    
	public void onAccuracyChanged(Sensor arg0, int arg1){		
	}
	
	public void onSensorChanged(SensorEvent event){          //在activity中完成该接口函数
		if(event.sensor == null){
			return;
		}
		
		if(event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
			mLastX = event.values[0];
			mLastY = event.values[1];
			mLastZ = event.values[2];
			
			sX = String.valueOf(mLastX);
			sY = String.valueOf(mLastY);
			sZ = String.valueOf(mLastZ);
			
			mTextViewX.setText(sX);
			mTextViewY.setText(sY);
			mTextViewZ.setText(sZ);   //由于该接口函数不断刷新，所以可以把控件显示函数放在这里显示
		}
	}
    
    protected void onStop(){                          //同样在退出activity时要注销监听
    	super.onStop();
		if(mSensorManager != null){
			mSensorManager.unregisterListener(this);
			mSensorManager = null;
		}
    }
}

该函数可在一个activity中即时显示gsensor数据，方便查看。

========================================================================================================================

现实中的很多手机应用会到gsensor这个感应器，比如手机的倾斜角度，手机的运动方向和加速度。如果我们要在一个服务中通过监控gsensor的数据来判断手机的静止或者运动，进而作相应处理。流程是：原始数据 -> 低通滤波 -> 重力在3个方向的分量 -> 判断即可。以下步骤：

（1）服务定义时要implements SensorEventListener接口，以下是一些变量。

private SensorManager mSensorManager;          //sensor管理器
	private Sensor sensor;  			
	private float[] curGravity = new float[3];	//xyz重力数据
	private lowPassFilter filter1;
	private lowPassFilter filter2;
	private firLowPassFilter firFilter1;
	private firLowPassFilter firFilter2;
	private firLowPassFilter firFilter3;    	//低通滤波的一些类的内容
	private int mAccSkipCnt = 0;		//抖动计数
	private static final int __ACC_SKIP_SAMPLES = 30;	// 跳过刚开始的若干个加速度采样
	private int _NTAPS = 6;
	private double[] h = {
			0.125514644795420960,
			0.414388923238107440,
			-0.013420976983735622,
			-0.013420976983735622,
			0.414388923238107440,
			0.125514644795420960
			};
	private boolean DeviceFlating = false;	//手机是否平躺了

（2）在服务onCreate函数中定义sensor相关变量，并设置低通滤波的一些系数

mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);  
		sensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);  
		mSensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL); 
		filter1 = new lowPassFilter(1, 20);
		filter2 = new lowPassFilter(0, 0.9f);			
		firFilter1 = new firLowPassFilter(_NTAPS, h);
		firFilter2 = new firLowPassFilter(_NTAPS, h);
		firFilter3 = new firLowPassFilter(_NTAPS, h);

（3）SensorEventListener接口中要完成的成员函数

public void onSensorChanged(SensorEvent event){    
		if(event.sensor == null){  
			return;  
		}  
		mIsSmartStayOn= Settings.System.getInt(cr,"isSmartStayEnabled",0) == 1 ? true : false;//人眼识别打开时才启动重力监听
		if(mIsSmartStayOn == true){
			Log.i(TAG,"gsensor respond");
			
			curGravity[0] = (float)firFilter1.filter1((double)event.values[0]);
			curGravity[1] = (float)firFilter2.filter1((double)event.values[1]);
			curGravity[2] = (float)firFilter3.filter1((double)event.values[2]);
			curGravity = filter1.SMAFilter(curGravity);		//取得三轴重力数据并滤波处理
			
			if(mAccSkipCnt < __ACC_SKIP_SAMPLES) {
				mAccSkipCnt++;
				return ;					//待gsensor读数稳定才继续后面的处理
			}

			float[] linearAcc = new float[]{
					event.values[0]-curGravity[0],
					event.values[1]-curGravity[1],
					event.values[2]-curGravity[2]
			};
			double linearLen = KonkaGeneHelper.vecLength(linearAcc);	//三轴数据平方和相加开根号的结果
			Log.w(TAG,"linearLen is "+linearLen);
			if(linearLen < 0.6f && DeviceFlating == false){	//如果手机一开始没有静止并且linearLen小于0.6
				DeviceFlating = true;			//手机趋近于静止状态（不论方向）
			}
			if(linearLen > 1.0f && DeviceFlating == true && pm.isScreenOn() == true){
				DisplayEyeIcon(1);			//如果手机静止的，并且gsensor检测到linearLen大于1且手机亮屏					freshDetect();
				DeviceFlating = false;		//马上启动人眼识别
			}			
		}		
	}

通过以上过程，可以参考其中的重力计算和判断流程用在其他场合。

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手机摇一摇功能，仅需要在上面sensor读值获取的地方，加上判断即可。如下的示例，摇一摇时震动并toast提示。

private static final int SENSOR_SHAKE = 10; //自定义消息

..................................

int medumValue = 19;// 
	if (Math.abs(mLastX) > medumValue || Math.abs(mLastX) > medumValue || Math.abs(mLastX) > medumValue) {   
                vibrator.vibrate(200);   
                Message msg = new Message();   
                msg.what = SENSOR_SHAKE;   
                handler.sendMessage(msg);   
            }

..............................

Handler handler = new Handler() {   
        public void handleMessage(Message msg) {   
            super.handleMessage(msg);   
            switch (msg.what) {   
            case SENSOR_SHAKE:   
                Toast.makeText(MainActivity.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;   
            }   
        }  
  };

参见/article/1349709.html

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测试气压计的应用如下：

public class MainActivity extends Activity {

	private SensorManager mSensorManager=null;
	private Sensor mSensor=null;
	private TextView textView1=null;
	private Button button1=null;
	private Button button2=null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		textView1=(TextView)findViewById(R.id.textView1);
		/*获取系统服务（SENSOR_SERVICE）返回一个SensorManager对象*/
		mSensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);
		/*通过SensorManager获取相应的（压力传感器）Sensor类型对象*/
		mSensor=mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);
		/*注册相应的SensorService*/
		button1=(Button)findViewById(R.id.button1);
		button1.setOnClickListener(new Button.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				mSensorManager.registerListener(mSensorEventListener, mSensor
						, SensorManager.SENSOR_DELAY_NORMAL);
			}
		});
		/* 销毁相应的SensorService
		 * 很关键的部分，注意，说明文档中提到，即使Activity不可见的时候，感应器依然会继续工作
		 * 所以一定要关闭触发器，否则将消耗用户大量电量*/
		button2=(Button)findViewById(R.id.button2);
		button2.setOnClickListener(new Button.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				mSensorManager.unregisterListener(mSensorEventListener, mSensor);
			}
		});
	}
	/*声明一个SensorEventListener对象用于侦听Sensor事件，并重载onSensorChanged方法*/
	private final SensorEventListener mSensorEventListener=new SensorEventListener() {
		
		@Override
		public void onSensorChanged(SensorEvent event) {
			if(event.sensor.getType()==Sensor.TYPE_PRESSURE){
				/*压力传感器返回当前的压强，单位是百帕斯卡hectopascal（hPa）。*/
				float pressure=event.values[0];
				textView1.setText(String.valueOf(pressure)+"hPa");
			}
		}
		
		@Override
		public void onAccuracyChanged(Sensor sensor, int accuracy) {
			// TODO Auto-generated method stub
			
		}
	};

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

参考原文：http://www.cnblogs.com/snowdrop/articles/1802092.html