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0.6DeviceFlating = 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。

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

       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http://blog.csdn.net/jason0539/article/details/10154997

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

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;@Overrideprotected 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() {@Overridepublic 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() {@Overridepublic 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() {@Overridepublic 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");}}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {// TODO Auto-generated method stub}};@Overridepublic 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