在Android中使用Accelerometer准确检测移动

Question

我正在实施一个演示TIMER,振动(在特定条件下),当我按下启动时,我的计时器开始运行..当我使用停止按钮停止它时,它只是停止.

现在我必须集成一个功能,当人员移动设备时(在Timer运行时),它应该重置计时器.它工作得很好,但加速度计功能并不是绝对准确的.它需要一个快速的反射来重置计时器.

建议我一个很好的解决方案.

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);
    }

}

计时器活动

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();
    };

} 

Answer 1

我认为开发应用程序的下一个阶段是查看电子表格中产生的加速度值.我使用Excel进行此操作,但任何可以生成图形的工具都可以.所以换成onSensorChanged()类似的东西

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);

}

然后你可以将currentTime,mAccelCurrent和mAccel捕获到Android日志记录机制中.或者,创建自己的文本文件,在那里写入值,然后在可以生成图形的工具中打开文件.然后,您可以从图表中确定要为触发器使用的值.