在Android中使用加速度计准确检测运动 [英] Detect Movement Accurately using Accelerometer in Android
问题描述
我正在实现一个带有振动的演示计时器(在特定条件下)，当我按下开始时，我的计时器开始运行......当我使用停止按钮停止它时，它就会停止.
I am implementing a demo TIMER, with Vibration ( at a particular condition ), When I press start my timer starts running.. and when I stop it using stop button, it simply stops.
现在我必须集成一个功能，当人移动设备(当计时器正在运行时)，它应该重置计时器.它工作得很好，但加速度计功能不能绝对准确地工作.重置计时器需要一个快速的混蛋.
Now I have to integrate a functionality, when the person shifts the device (while the Timer is running), it should reset the timer. It is working pretty good, but the accelerometer functionality is not working absolutely accurate. It needs a fast jerk to reset the timer.
建议我一个好的解决方案.
Suggest me a good solution for the same.
这是我的代码
public class SensorAccelerometer implements SensorEventListener {
private Context context;
private SensorManager sensorManager;
private Sensor accelerometer;
private TextView timelabel;
private Handler mHandler;
Runnable run;
private float mLastX, mLastY, mLastZ;
private final float NOISE = (float) 3.0;
public SensorAccelerometer(Context context) {
}
public SensorAccelerometer(Context context,TextView timelabel, Handler mHandler2, Runnable mUpdateTimeTask) {
// TODO Auto-generated constructor stub
this.context = context;
this.timelabel = timelabel;
this.mHandler = mHandler2;
this.run = mUpdateTimeTask;
initialiseSensor();
}
public void initialiseSensor(){
sensorManager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ALL);
sensorManager.registerListener(this, accelerometer,SensorManager.SENSOR_DELAY_NORMAL);
}
public void unregisterSensor(){
sensorManager.unregisterListener(this);
Toast.makeText(context, "Sensor Stopped..", Toast.LENGTH_SHORT).show();
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
public void onSensorChanged(SensorEvent event) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
mAccelLast=mAccelCurrent;
mAccelCurrent = FloatMath.sqrt(x*x + y*y + z*z);
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta;
if(mAccel>0.5){
TimerActivity.mStartTime = SystemClock.uptimeMillis();
mHandler.removeCallbacks(run);
mHandler.postDelayed(run, 100);
}
}
定时器活动
public class TimerActivity extends Activity {
public static long mStartTime = 0L;
private TextView mTimerLabel;
private Handler mHandler = new Handler();
String timerStop1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mTimerLabel = (TextView) findViewById(R.id.textTimer);
Button timerStartButton = (Button) findViewById(R.id.btnTimer);
timerStartButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view){
if(mStartTime == 0L){
mStartTime = SystemClock.uptimeMillis();
mHandler.removeCallbacks(mUpdateTimeTask);
mHandler.postDelayed(mUpdateTimeTask, 100);
//activating the sensor and the acclerometer
SensorAccelerometer acc = new SensorAccelerometer(view.getContext(), mTimerLabel,mHandler,mUpdateTimeTask);
}
}
});
Button timerStopButton = (Button) findViewById(R.id.btnTimerStop);
timerStopButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view){
mHandler.removeCallbacks(mUpdateTimeTask);
mTimerLabel.setText(timerStop1);
mStartTime = 0L;
SensorAccelerometer scc = new SensorAccelerometer(view.getContext(),mTimerLabel,mHandler,mUpdateTimeTask);
scc.unregisterSensor();
}
});
}
private Runnable mUpdateTimeTask = new Runnable(){
public void run() {
final long start = mStartTime;
long millis = SystemClock.uptimeMillis()- start;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
mTimerLabel.setText("" + minutes + ":"
+ String.format("%02d", seconds));
timerStop1 = minutes + ":"
+ String.format("%02d", seconds);
mHandler.postDelayed(this, 200);
}
};
protected void onPause() {
super.onPause();
SensorAccelerometer scc = new SensorAccelerometer(this,mTimerLabel,mHandler,mUpdateTimeTask);
scc.unregisterSensor();
};
}
推荐答案
我认为应用开发的下一个阶段是查看电子表格中产生的加速度值.我为此使用 Excel，但任何可以生成图表的工具都可以.因此将 onSensorChanged() 更改为类似
I think the next stage in the development of your app is to look at values of acceleration that are produced in a spreadsheet. I use Excel for this, but any tool that can produce graphs will do. So alter onSensorChanged() to something like
public void onSensorChanged(SensorEvent event) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
float mAccelCurrent = FloatMath.sqrt(x*x + y*y + z*z);
float mAccel = mAccel * 0.9f + mAccelCurrent * 0.1f;
Log.d("onSensorChanged",System.currentTimeMillis()+","+mAccelCurrent +","+mAccel);
}
然后您可以将 currentTime、mAccelCurrent 和 mAccel 捕获到 Android 日志记录机制中.或者，创建您自己的文本文件，在其中写入值，然后在可以生成图形的工具中打开该文件.然后，您可以从图表中决定要为触发器使用哪些值.
and then you can capture the currentTime, mAccelCurrent and mAccel into the Android logging mechanism. Alternatively, create your own text file, write the values there, and open the file in a tool that can produce graphs. From the graphs, you can then decide what values to use for your trigger.
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