Android: Add support for multiple QtViews in same Context

This patch makes it possible to have multiple QtViews
in an Android app, provided they are in the same Context.

Task-number: QTBUG-127422
Task-number: QTBUG-124116
Change-Id: I3d5bef3f789f23c8495c3b7209bbd3e430d439ac
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>
(cherry picked from commit 0af53d3e87464a0638e4fdb8b68287912281a2a6)

src/android/jar/src/org/qtproject/qt/android/QtEmbeddedDelegate.java

@@ -20,23 +20,20 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.PopupMenu;
 
-import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 
 class QtEmbeddedDelegate extends QtActivityDelegateBase
         implements QtNative.AppStateDetailsListener, QtEmbeddedViewInterface, QtWindowInterface,
                    QtMenuInterface
 {
     private static final String QtTAG = "QtEmbeddedDelegate";
-    // TODO simplistic implementation with one QtView, expand to support multiple views QTBUG-117649
-    private QtView m_view;
+    private final HashSet<QtView> m_views = new HashSet<>();
     private QtNative.ApplicationStateDetails m_stateDetails;
-    private boolean m_windowLoaded = false;
     private boolean m_backendsRegistered = false;
 
     QtEmbeddedDelegate(Activity context) {
         super(context);
-
         m_stateDetails = QtNative.getStateDetails();
         QtNative.registerAppStateListener(this);
 
@@ -111,7 +108,6 @@ class QtEmbeddedDelegate extends QtActivityDelegateBase
     @Override
     public void onNativePluginIntegrationReadyChanged(boolean ready)
     {
-        synchronized (this) {
         if (ready) {
             QtNative.runAction(() -> {
                 DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
@@ -119,8 +115,6 @@ class QtEmbeddedDelegate extends QtActivityDelegateBase
                                                               metrics.heightPixels);
 
             });
-                createRootWindow();
-            }
         }
     }
 
@@ -138,26 +132,26 @@ class QtEmbeddedDelegate extends QtActivityDelegateBase
     }
 
     @Override
-    public void queueLoadWindow()
+    public void addView(QtView view)
     {
-        synchronized (this) {
-            if (m_stateDetails.nativePluginIntegrationReady)
-                createRootWindow();
+        if (m_views.add(view)) {
+            QtNative.runAction(() -> { createRootWindow(view); });
         }
     }
 
     @Override
-    public void setView(QtView view)
+    public void removeView(QtView view)
     {
-        m_view = view;
+        m_views.remove(view.getId());
     }
     // QtEmbeddedViewInterface implementation end
 
-    private void createRootWindow() {
-        if (m_view != null && !m_windowLoaded) {
-            QtView.createRootWindow(m_view, m_view.getLeft(), m_view.getTop(), m_view.getWidth(),
-                                    m_view.getHeight());
-            m_windowLoaded = true;
+    // This gets called from Android thread
+    private void createRootWindow(QtView view) {
+        // No use in creating a QQuickView for a View that has been removed
+        if (m_views.contains(view)) {
+            QtView.createRootWindow(view, view.getLeft(), view.getTop(), view.getWidth(),
+                                view.getHeight());
         }
     }
 
@@ -174,12 +168,12 @@ class QtEmbeddedDelegate extends QtActivityDelegateBase
     @Override
     public void openContextMenu(final int x, final int y, final int w, final int h)
     {
-        m_view.postDelayed(() -> {
         final QtEditText focusedEditText = m_inputDelegate.getCurrentQtEditText();
         if (focusedEditText == null) {
             Log.w(QtTAG, "No focused view when trying to open context menu");
             return;
         }
+        focusedEditText.postDelayed(() -> {
             PopupMenu popup = new PopupMenu(m_activity, focusedEditText);
             QtNative.fillContextMenu(popup.getMenu());
             popup.setOnMenuItemClickListener(menuItem ->

src/android/jar/src/org/qtproject/qt/android/QtEmbeddedViewInterface.java

@@ -10,6 +10,6 @@ package org.qtproject.qt.android;
 **/
 interface QtEmbeddedViewInterface {
     void startQtApplication(String appParams, String mainLib);
-    void setView(QtView view);
-    void queueLoadWindow();
+    void addView(QtView view);
+    void removeView(QtView view);
 };

src/android/jar/src/org/qtproject/qt/android/QtServiceEmbeddedDelegate.java

@@ -71,20 +71,22 @@ class QtServiceEmbeddedDelegate implements QtEmbeddedViewInterface, QtNative.App
     }
 
     @Override
-    public void setView(QtView view)
+    public void addView(QtView view)
     {
         m_view = view;
-        // If the embedded view is destroyed, do cleanup:
-        if (view == null)
-            cleanup();
+        QtNative.runAction(() -> {
+            createRootWindow();
+        });
     }
 
     @Override
-    public void queueLoadWindow()
+    public void removeView(QtView view)
     {
-        synchronized (this) {
-            if (QtNative.getStateDetails().nativePluginIntegrationReady)
-                createRootWindow();
+        if (m_view == view) {
+            m_view = null;
+            m_windowLoaded = false;
+            // If the embedded view is destroyed, do cleanup:
+            cleanup();
         }
     }
     // QtEmbeddedViewInterface implementation end

src/android/jar/src/org/qtproject/qt/android/QtView.java

@@ -70,6 +70,8 @@ abstract class QtView extends ViewGroup {
                 }
             }
         });
+        if (getId() == -1)
+            setId(View.generateViewId());
     }
     /**
      * Create a QtView for embedding a QWindow, and load the Qt libraries if they have not already
@@ -90,15 +92,14 @@ abstract class QtView extends ViewGroup {
     @Override
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();
-        m_viewInterface.setView(this);
-        m_viewInterface.queueLoadWindow();
+        m_viewInterface.addView(this);
     }
 
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         destroyWindow();
-        m_viewInterface.setView(null);
+        m_viewInterface.removeView(this);
     }
 
     @Override