不尋常的步數計數器讀數

Question

我正在嘗試使用移動的accerlerometer為android構建一個步數計數器應用程序。 無需重新啟動移動設備，即可獲得幾乎准確的讀數。 這是針對每個步驟，它將值遞增1.當重新啟動移動設備時，步數計數器值變為0，因此我使用sharedPreferences保存了先前讀數的值 。 但是當我啟動手機並開始行走時，步數計數器每步增加2.如何解決？

public class Pedometer extends Activity implements SensorEventListener {
    private TextView textView;

    private SensorManager mSensorManager;

    private Sensor mStepCounterSensor;

    private Sensor mStepDetectorSensor;

    SharedPreferences sharedPreferences;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pedometer);
        textView = (TextView) findViewById(R.id.textview);

        mSensorManager = (SensorManager)
                getSystemService(Context.SENSOR_SERVICE);
        mStepCounterSensor = mSensorManager
                .getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
        mStepDetectorSensor = mSensorManager
                .getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        SharedPreferences.Editor editor = sharedPreferences.edit();

        Sensor sensor = event.sensor;
        float[] values = event.values;
        int value = -1;
        if (values.length > 0) {
            value = (int) values[0];
        }

        int temp =  sharedPreferences.getInt("steps", 0);

        if (temp > value) {
            temp = temp + 1;
            editor.putInt("steps", temp).commit();
        } else {
            editor.putInt("steps", value).commit();
        }

        int count = sharedPreferences.getInt("steps", 0);

        if (sensor.getType() == Sensor.TYPE_STEP_COUNTER) {
            textView.setText("Step Counter Detected : " + count);
        } else if (sensor.getType() == Sensor.TYPE_STEP_DETECTOR) {
            // For test only. Only allowed value is 1.0 i.e. for step taken
            textView.setText("Step Detector Detected : " + count);
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

    @Override
    protected void onResume() {

        super.onResume();

        mSensorManager.registerListener(this, mStepCounterSensor,

                SensorManager.SENSOR_DELAY_FASTEST);
        mSensorManager.registerListener(this, mStepDetectorSensor,

                SensorManager.SENSOR_DELAY_FASTEST);

    }

    @Override
    protected void onStop() {
        super.onStop();
        mSensorManager.unregisterListener(this, mStepCounterSensor);
        mSensorManager.unregisterListener(this, mStepDetectorSensor);
    }
}

Answer 1

問題是你的聽眾沒有注冊，就像其他人報道的那樣 。 由於您已注冊多個偵聽器和共享變量，因此步驟將計為兩次。 要解決此問題，您需要獲取共享狀態以跟蹤您的偵聽器是否未注冊。