Android 保持屏幕常亮

     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();
    }
}

    

     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)。