改变亮度Brightness

wang_peng1

<uses-permission android:name="android.permission.HARDWARE_TEST"></uses-permission>  
import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.IHardwareService;import android.os.Message;import android.os.RemoteException;import android.os.ServiceManager;import android.widget.TextView;public class Main extends Activity  {   private TextView txtStatus;  private RefreshHandler mRedrawHandler = new RefreshHandler();  class RefreshHandler extends Handler {    @Override    public void handleMessage(Message msg) {      Main.this.updateUI();    }    public void sleep(long delayMillis) {      this.removeMessages(0);      sendMessageDelayed(obtainMessage(0), delayMillis);    }  };  private void updateUI(){    int currentInt = Integer.parseInt((String) txtStatus.getText()) + 20;    if(currentInt <= 250){      mRedrawHandler.sleep(1000);      setBrightness(currentInt);      txtStatus.setText(String.valueOf(currentInt));    }  }  @Override   public void onCreate(Bundle icicle) {     super.onCreate(icicle);     setContentView(R.layout.main);    this.txtStatus = (TextView) this.findViewById(R.id.txtStatus);    updateUI();  }   private void setBrightness(int brightness) {    try {      IHardwareService hardware = IHardwareService.Stub.asInterface(ServiceManager.getService("hardware"));      if (hardware != null) {        hardware.setScreenBacklight(brightness);      }    } catch (RemoteException doe) {              }          }}