保持屏幕常亮

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)

首先添加权限：

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

 实现代码：

 
public class test extends Activity

{
 
    PowerManager powerManager = null;
 
    WakeLock wakeLock = null;
 
    @Override
 
    protected void onCreate(Bundle savedInstanceState) {
 
        super.onCreate(savedInstanceState);
 
        this.setContentView(R.layout.main);
 
         
 
        this.powerManager = (PowerManager)this.getSystemService(Context.POWER_SERVICE);
 
        this.wakeLock = this.powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Lock");
 
    }
 
    @Override
 
    protected void onResume() {
 
        super.onResume();
 
        this.wakeLock.acquire();
 
    }
 
    @Override
 
    protected void onPause() {
 
        super.onPause();
 
        this.wakeLock.release();
 
    }
 
}