显示当前光照强度

src目录下MainActivity.java代码如下:
 1 package com.example.guangzhao; 2  3  4  5 import android.os.Bundle; 6 import android.app.Activity; 7 import android.content.Context; 8 import android.hardware.Sensor; 9 import android.hardware.SensorEvent;10 import android.hardware.SensorEventListener;11 import android.hardware.SensorManager;12 import android.view.Menu;13 import android.widget.TextView;14 15 public class MainActivity extends Activity {16 17   private SensorManager sensorManager;18   private TextView lightLevel;19 20   @Override21   protected void onCreate(Bundle savedInstanceState) {22     super.onCreate(savedInstanceState);23     setContentView(R.layout.activity_main);24     lightLevel = (TextView) findViewById(R.id.light);25     sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);26     Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);27     Sensor sensors;28     sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL);29   }30 31   protected void onDestory() {32     super.onDestroy();33     if (sensorManager != null) {34       sensorManager.unregisterListener(listener);35     }36   }37 38   private SensorEventListener listener = new SensorEventListener() {39     @Override40     public void onSensorChanged(SensorEvent event) {41       // valuse 数组中第一个下标的值就是当前的光照强度42       float value = event.values[0];43       lightLevel.setText("当前光照强度为" + value + "勒克斯");44     }45 46     @Override47     public void onAccuracyChanged(Sensor sensor, int accuracy) {48 49     }50   };51 }

activity_main.
<?<RelativeLayout     android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <TextView 
        android:id="@+id/light"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textSize="20sp"
        />
</RelativeLayout>

 



原标题：显示当前光照强度
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