如何让android的屏幕保持常亮

首先添加权限：

<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>

     实现代码：

   1: public class test extends Activity

   2: {

   3:     PowerManager powerManager = null;

   4:     WakeLock wakeLock = null;

   5:     @Override

   6:     protected void onCreate(Bundle savedInstanceState) {

   7:         super.onCreate(savedInstanceState);

   8:         this.setContentView(R.layout.main);

   9:         

  10:         this.powerManager = (PowerManager)this.getSystemService(Context.POWER_SERVICE);

  11:         this.wakeLock = this.powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Lock");

  12:     }

  13:     @Override

  14:     protected void onResume() {

  15:         super.onResume();

  16:         this.wakeLock.acquire();

  17:     }

  18:     @Override

  19:     protected void onPause() {

  20:         super.onPause();

  21:         this.wakeLock.release();

  22:     }

  23: }

    

     说明：在不同的生命周期调用不用的WakeLock函数可以使系统正常运行(如果不调用WakeLock.release，则屏幕会一直常亮)。
转载自http://www.cnblogs.com/xiaobo68688/archive/2011/08/12/2135824.html