如何獲取傳感器值作爲變量

Question

這可能是個愚蠢的問題，但我無法自己處理。我設法獲得了Light Sensor的價值。我需要得到這個值作爲變量，但我不能訪問變量X.你能幫我嗎？

公共類lightWakeup擴展AppCompatActivity {

ImageButton imageButton; 
Intent navrat; 
MediaPlayer mp; 
TextView text; 
SensorManager sensorManager; 
Sensor sensor; 
float x; 
public float c; 





@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_light_wakeup); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    text = (TextView)findViewById(R.id.textView); 

      //zapnuti hudby 
    mp = MediaPlayer.create(this, R.raw.hypnothis); 
    mp.setVolume(50, 50); 
    mp.start(); 

    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); 
    sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); 
    text.setText(String.valueOf(c)); 




    imageButton = (ImageButton) findViewById(R.id.imageButton); 
    imageButton.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      mp.stop(); 
      navrat = new Intent(getApplicationContext(), MainPage.class); 
      startActivity(navrat); 
     } 
    }); 
} 
public void onResume() { 
    super.onResume(); 
    sensorManager.registerListener(lightListener, sensor, 
      SensorManager.SENSOR_DELAY_NORMAL); 
} 

public void onStop() { 
    super.onStop(); 
    sensorManager.unregisterListener(lightListener); 
} 

public SensorEventListener lightListener = new SensorEventListener() { 
    public void onAccuracyChanged(Sensor sensor, int acc) { } 

    public void onSensorChanged(SensorEvent event) { 
     x = event.values[0]; 
     text.setText((int)x); 

    } 
}; 

}

Answer 1

您需要設置變量x public修飾符：

public float x; 

默認情況下，沒有修飾類變量被設置爲C＃中的「內部」。你可以在https://msdn.microsoft.com/en-us/library/ms173121.aspx