Facing Problem with New Window API Android SDK >= 30 using QJniObject

Kafabih

Hello everyone, is anybody can show me how to use new window API for Android R alias SDK => 30 by using QJniObject? I am have problem here for calling many method on new window API. Do not tell me to using java instead, because I want to made the code purely using c++ without java.

Here sample I call WindowInsetsController object but the logcat said no such method.

QJniObject activity = QNativeInterface::QAndroidApplication::context();
QJniObject window = activity.callObjectMethod("getWindow","()Landroid/view/Window;");
QJniObject decorview = window.callObjectMethod("getDecorView","()Landroid/view/View;");
QJniObject insets = decorview.callObjectMethod("getWindowInsetsController","()Landroid/view/Window;");

Error said if I using decorview to call WindowInsetsController

java.lang.NoSuchMethodError: no non-static method "Lcom/android/internal/policy/DecorView;.getWindowInsetsController()Landroid/view/Window;"

Error said if I just using window to call WindowInsetsController

java.lang.NoSuchMethodError: no non-static method "Lcom/android/internal/policy/PhoneWindow;.getWindowInsetsController()Landroid/view/Window;"

jsulm

@Kafabih I'm not an Android expert but the error says that there is no such non-static method. Maybe you need to call it using callStaticMethod?

Kafabih

I have tried by calling as static object as below

QJniObject insets = window.callStaticObjectMethod("()Landroid/view/WindowInsetsController;","getWindowInsetsController","Ljava/lang/Object;");

but it cause error as below

System.err: java.lang.ClassNotFoundException: Didn't find class "()Landroid.view.WindowInsetsController;"

According this reference getWindowInsets can call by calling window class, but it facing no class found. This is weird.

jsulm

@Kafabih According to the link you posted you can call it using Landroid/view/View?

Landroid/view/View;->getWindowInsetsController()Landroid/view/WindowInsetsController;

Kafabih

@jsulm I already using getDecorView from android/view/View class as mentioned before still no class found.

JoeCFD

@Kafabih said in Facing Problem with New Window API Android SDK => 30 using QJniObject:

android/view/WindowInsetsControlle

Are you using Qt5 or 6? Does your return type android/view/Window or android/view/View exist?
https://doc.qt.io/qt-5/qandroidjniobject.html
Qt Jni works this way: send context into Java code and do things as needed in Java code and then return what is defined in the link above? You can not get what is defined in Java. Qt Jni is an interface between android native Java lib and Qt.

Kafabih

@JoeCFD I using QT 6 for developing app. Did QT6 adding androidx support? Because when I call androidx using

QJniObject activity = QNativeInterface::QAndroidApplication::context(); 
QJniObject window = activity.callObjectMethod("getWindow","()Landroidx/view/WindowCompat;");

Logcat said error no method found androidx.

Kafabih

Alright sorry for my bad for WindowInsets calling. Since 2020 when android 11 released. DecorView has separated api to controlling SystemUI. It is called WindowInsetsController. And for this you need to call android/view/WindowInsetsController as below.

QJniObject insets = decorview.callObjectMethod("getWindowInsetsController","()Landroid/view/WindowInsetsController;");

But I cannot determining which navigation bar visibility by using WindowInsets as below.

QJniObject insets = decorview.callObjectMethod("getRootWindowInsets","()Landroid/view/WindowInsets;");
bool isNavbarVisible = insets.callMethod<jboolean>("isVisible","(I)Z",2);

The logcat always shown no such method.

Kafabih

After spending more hours to exploring the new Window API on SDK >= 30 I have conclusion with this new Window API. The WindowInsets did not separate from DecorView, but this WindowInsets is inherited from DecorView, so you must calling DecorView first. Thanks for yours helps especially @JoeCFD for remembering me to write the correct return type. Here I gave pieces codes to facing the new Android API as Holiday gift 2022 pieces codes to facing new Android API SDK >= 30