[英]How to prevent android device from sleep while qt application is running
I have an android application of slideshow which is developed in qt. 我有一个在qt中开发的slideshow的android应用程序。 The device after some time, gets the screen dim, and goes off and locked.
一段时间后,设备屏幕变暗,然后关闭并锁定。 How can I avoid this, until user quits the application.
在用户退出应用程序之前,如何避免这种情况。
Like similar to “android.permission.WAKE_LOCK” and call some functions.. I'm not sure exactly. 类似于“ android.permission.WAKE_LOCK”并调用一些函数。。我不确定。
You need to execute this piece of java code: 您需要执行以下这段Java代码:
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.acquire();
To do so, add this file to your project: 为此,将此文件添加到您的项目中:
WakeLock.java: WakeLock.java:
package my.utl;
import org.qtproject.qt5.android.bindings.QtActivity;
import org.qtproject.qt5.android.bindings.QtApplication;
import java.lang.String;
import android.app.Activity;
import android.os.PowerManager;
import android.content.Context;
public class WakeLock
{
private Activity myActivity;
protected PowerManager.WakeLock m_WakeLock = null;
public WakeLock(Activity a)
{
myActivity = a;
}
public int configure()
{
System.out.println("Inside WakeLock::configure");
try
{
final PowerManager pm = (PowerManager) myActivity.getSystemService(Context.POWER_SERVICE);
m_WakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
// m_WakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "My Tag");
// Does not work: https://stackoverflow.com/questions/5183859/partial-wake-lock-vs-screen-dim-wake-lock-in-download-thread
m_WakeLock.acquire();
return 42;
}
catch (Exception e)
{
System.out.println("WakeLock failed: " + e.toString());
}
return -1;
}
}
Then, from your app, just execute the code: 然后,从您的应用程序中,只需执行代码:
QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;"); //activity is valid
if ( activity.isValid() )
{
QAndroidJniObject wakeLockObject("my/utl/WakeLock","(Landroid/app/Activity;)V",activity.object<jobject>());
if ( wakeLockObject.isValid() )
{
jint res = wakeLockObject.callMethod<jint>("configure","()I");
assert( res == 42 ); // check Java code was executed...
}
else
{
assert( false );
}
}
else
{
assert( false );
}
There might be a way to do this without the java file. 没有Java文件,可能有一种方法可以做到这一点。 I'm working on it: Unable to call PowerManager.WakeLock.newWakeLock using QAndroidJniObject
我正在努力: 无法使用QAndroidJniObject调用PowerManager.WakeLock.newWakeLock
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