在Android上以编程方式打开屏幕

Question

当用户使用电源按钮关闭时,我需要以编程方式打开屏幕,是的,我总是在Activity保持屏幕上有正确的标志,但它不会避免用户按下电源按钮.

到目前为止,我已经找到了一个解决方案,但它使用了一个已弃用的唤醒锁

sWakeLock = sPM.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, TAG_WAKELOCK);

sWakeLock.acquire();
sWakeLock.release();

有更好的方法来实现它吗？

Answer 1

在Lollipop中,您可能想要添加更多标志:

final Window win = getWindow();
    win.addFlags( WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
            WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON |
            WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON |
            WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON );

我从AOSP获得了这个https://android.googlesource.com/platform/packages/apps/DeskClock/+/dfd1960/src/com/android/deskclock/alarms/AlarmActivity.java

Answer 2

以下是从活动中打开屏幕的最新方法：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
    this.setTurnScreenOn(true);
} else {
    final Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
}

使用FLAG_TURN_SCREEN_ON但此标志已在 API 级别 27 中弃用，因此从 API 级别 27 开始使用Activity.setTurnScreenOn(true)。

Answer 3

代码

 PowerManager powerManager = (PowerManager) context.getSystemService(context.POWER_SERVICE);
    PowerManager.WakeLock  wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK |
            PowerManager.ACQUIRE_CAUSES_WAKEUP |
            PowerManager.ON_AFTER_RELEASE, "appname::WakeLock");

    //acquire will turn on the display
    wakeLock.acquire();

    //release will release the lock from CPU, in case of that, screen will go back to sleep mode in defined time bt device settings
    wakeLock.release();

在清单文件中，权限应该是

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