无法使用QAndroidJniObject调用PowerManager.WakeLock.newWakeLock

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问题描述

我试图执行这个Java代码：

  PowerManager pm =（PowerManager）getSystemService（Context.POWER_SERVICE）; 
 PowerManager.WakeLock wl = pm.newWakeLock（PowerManager.SCREEN_DIM_WAKE_LOCK，My Tag）; 
 wl.acquire（）;使用Qt QAndroidJniObject（我在Android上部署一个Qt应用程序）

$ b

我这样做：

  QAndroidJniObject activity = QAndroidJniObject :: callStaticObjectMethod（org / qtproject / qt5 / android / QtNative，activity，（）Landroid / app / Activity;）; 
 if（activity.isValid（））
 {
 QAndroidJniObject serviceName = QAndroidJniObject :: getStaticObjectField< jstring>（android / content / Context，POWER_SERVICE）; 
 if（serviceName.isValid（））
 {
 QAndroidJniObject powerMgr = activity.callObjectMethod（getSystemService，（Ljava / lang / String;）Ljava / lang / Object;，serviceName .object< jobject>（））; 
 if（powerMgr.isValid（））
 {
 QAndroidJniObject wakeLock = powerMgr.callObjectMethod（newWakeLock，（ILjava / lang / String;）Landroid / os / PowerManager / WakeLock; ，levelAndFlags，tag.object< jstring>（））; 
 
 if（wakeLock.isValid（））
 wakeLock.callMethod< void>（acquire，（）V）; 
 else 
 assert（false）; 
} 
} 
}

从调试器检查： code> levelAndFlags 是正确的（6），标签是正确的.isValid（）返回false。

此行必须有问题：

  QAndroidJniObject wakeLock = powerMgr.callObjectMethod（newWakeLock，（ILjava / lang / String;）Landroid / os / PowerManager / WakeLock;，levelAndFlags，tag.object< jstring> （））;

但我不知道什么...

解决方案

嵌套类名需要特殊的语法：

  / PowerManager / WakeLock

应为：

  Landroid / os / PowerManager $ WakeLock

I'm trying to execute this Java code:

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.acquire();

using Qt QAndroidJniObject (I'm deploying a Qt app on Android).

I did that:

QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");
if ( activity.isValid() )
{
    QAndroidJniObject serviceName = QAndroidJniObject::getStaticObjectField<jstring>("android/content/Context","POWER_SERVICE");
    if ( serviceName.isValid() )
    {
        QAndroidJniObject powerMgr = activity.callObjectMethod("getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;",serviceName.object<jobject>());
        if ( powerMgr.isValid() )
        {
            QAndroidJniObject wakeLock = powerMgr.callObjectMethod("newWakeLock", "(ILjava/lang/String;)Landroid/os/PowerManager/WakeLock;", levelAndFlags,tag.object<jstring>());

            if ( wakeLock.isValid() )
                wakeLock.callMethod<void>("acquire", "()V");
            else
                assert( false );
        }
    }
}

Checked from the debugger: levelAndFlags is correct (6), tag is correct ("My Tag"), but wakeLock.isValid() returns false.

There must be a problem with this line:

QAndroidJniObject wakeLock = powerMgr.callObjectMethod("newWakeLock", "(ILjava/lang/String;)Landroid/os/PowerManager/WakeLock;", levelAndFlags,tag.object<jstring>());

But I can't figure out what...

解决方案

Nested class names requires a special syntax:

Landroid/os/PowerManager/WakeLock

Should be:

Landroid/os/PowerManager$WakeLock

And it works!

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