改变亮度Brightness

<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) {          

    }        

  }

}