如何使Android WakeLock正常工作？

Question

我的WakeLock不能使我的设备保持唤醒状态。

在OnCreate()我有：

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

mWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, "My Tag");

mWakeLock.acquire();

然后：

new CountDownTimer(1320000, 200) {

    public void onTick(long millisUntilFinished) {

        // I update a progress bar here.                                         

    }

    public void onFinish() {

        // I finish updating the progress bar.

        mWakeLock.release();

    }

}.start();

在计时器结束之前屏幕关闭，如何使屏幕保持可见？

mWakeLock 是以前这样声明的字段：

private PowerManager.WakeLock mWakeLock;

我的设备使用Android 1.6。我真的很感激能解决这个问题。

Answer 1

您的清单中是否设置了所需的权限？<uses-permission android:name="android.permission.WAKE_LOCK" />

Answer 2

您只需要编写以下代码：&nbsp;private PowerManager.WakeLock wl;&nbsp; &nbsp; protected void onCreate(Bundle savedInstanceState) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;super.onCreate(savedInstanceState);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; setContentView(R.layout.main);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "DoNjfdhotDimScreen");&nbsp; &nbsp; }//End of onCreate&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; protected void onPause() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; super.onPause();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; wl.release();&nbsp; &nbsp; &nbsp; &nbsp; }//End of onPause&nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; protected void onResume() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; super.onResume();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; wl.acquire();&nbsp; &nbsp; &nbsp; &nbsp; }//End of onResume然后在清单文件中添加权限&nbsp;<uses-permission android:name="android.permission.WAKE_LOCK" />现在，您的活动将始终保持清醒状态。您可以根据需要执行其他操作w1.release()。