我是新来的传感器Android和现在有点糊涂了使用。我需要执行一些操作只是，如果有一个显著光线的变化，例如：光线是在一个黑暗的房间打开。我有一个pretty的简单的默认实现为止。我怎么能告诉系统我只想反应一个显著光线的变化？

 公共类MainActivity扩展活动实现SensorEventListener {

私人的SensorManager mSensorManager;
私人传感器mLight;
私人RelativeLayout的mLayout;

@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;
    mSensorManager =（的SensorManager）getSystemService（SENSOR_SERVICE）;
    mLight = mSensorManager.getDefaultSensor（Sensor.TYPE_LIGHT）;
    mLayout =（RelativeLayout的）findViewById（R.id.mLayout）;
    mLayout.setKeepScreenOn（真正的）;
}

@覆盖
保护无效onResume（）{
    mSensorManager.registerListener（这一点，mLight，
            SensorManager.SENSOR_DELAY_FASTEST）;
    super.onResume（）;
}

@覆盖
保护无效的onPause（）{
    mSensorManager.unregisterListener（本）;
    super.onPause（）;
}

@覆盖
公共无效onAccuracyChanged（传感器传感器，诠释精度）{
    如果（sensor.getType（）== Sensor.TYPE_LIGHT）{

        // 去做
    }

}

@覆盖
公共无效onSensorChanged（SensorEvent事件）{

    如果（event.sensor.getType（）== Sensor.TYPE_LIGHT）{

        // 去做
    }

}

    }
 

解决方案

试试下面的code： -

 进口android.hardware.Sensor;
进口android.hardware.SensorEvent;
进口android.hardware.SensorEventListener;
进口android.hardware.SensorManager;
进口android.os.Bundle;
进口android.app.Activity;
进口android.widget.TextView;

公共类MainActivity延伸活动{

 TextView的textLIGHT_available，textLIGHT_reading;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;

        textLIGHT_available
         =（TextView中）findViewById（R.id.LIGHT_available）;
        textLIGHT_reading
         =（TextView中）findViewById（R.id.LIGHT_reading）;

     的SensorManager mySensorManager =（的SensorManager）getSystemService（SENSOR_SERVICE）;

     传感器LightSensor = mySensorManager.getDefaultSensor（Sensor.TYPE_LIGHT）;
     如果（LightSensor！= NULL）{
      textLIGHT_available.setText（Sensor.TYPE_LIGHT可用）;
      mySensorManager.registerListener（
        LightSensorListener，
        LightSensor，
        SensorManager.SENSOR_DELAY_NORMAL）;

     }其他{
      textLIGHT_available.setText（Sensor.TYPE_LIGHT不可用）;
     }
    }

    私人最终SensorEventListener LightSensorListener
     =新SensorEventListener（）{

   @覆盖
   公共无效onAccuracyChanged（传感器传感器，诠释精度）{
    // TODO自动生成方法存根

   }

   @覆盖
   公共无效onSensorChanged（SensorEvent事件）{
    如果（event.sensor.getType（）== Sensor.TYPE_LIGHT）{
     textLIGHT_reading.setText（LIGHT：+ event.values​​ [0]）;
    }
   }

    };

}
 

I'm new to sensor use in android and now a bit confused. I need to perform some actions only if there's a significant light change, e.g. the light was turned on in a dark room. I have a pretty simple default implementation so far. How can I tell the system I only want to react to a significant light change?

              public class MainActivity extends Activity implements SensorEventListener {

private SensorManager mSensorManager;
private Sensor mLight;
private RelativeLayout mLayout;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    mLight = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
    mLayout = (RelativeLayout) findViewById(R.id.mLayout);
    mLayout.setKeepScreenOn(true);
}

@Override
protected void onResume() {
    mSensorManager.registerListener(this, mLight,
            SensorManager.SENSOR_DELAY_FASTEST);
    super.onResume();
}

@Override
protected void onPause() {
    mSensorManager.unregisterListener(this);
    super.onPause();
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
    if (sensor.getType() == Sensor.TYPE_LIGHT) {

        // TODO
    }

}

@Override
public void onSensorChanged(SensorEvent event) {

    if (event.sensor.getType() == Sensor.TYPE_LIGHT) {

        // TODO
    }

}

    }

try the below code :-

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.widget.TextView;

public class MainActivity extends Activity {

 TextView textLIGHT_available, textLIGHT_reading;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textLIGHT_available 
         = (TextView)findViewById(R.id.LIGHT_available);
        textLIGHT_reading 
         = (TextView)findViewById(R.id.LIGHT_reading);

     SensorManager mySensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);

     Sensor LightSensor = mySensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
     if(LightSensor != null){
      textLIGHT_available.setText("Sensor.TYPE_LIGHT Available");
      mySensorManager.registerListener(
        LightSensorListener, 
        LightSensor, 
        SensorManager.SENSOR_DELAY_NORMAL);

     }else{
      textLIGHT_available.setText("Sensor.TYPE_LIGHT NOT Available");
     }
    }

    private final SensorEventListener LightSensorListener
     = new SensorEventListener(){

   @Override
   public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // TODO Auto-generated method stub

   }

   @Override
   public void onSensorChanged(SensorEvent event) {
    if(event.sensor.getType() == Sensor.TYPE_LIGHT){
     textLIGHT_reading.setText("LIGHT: " + event.values[0]);
    }
   }

    };

}