Android: Clear the clipboard when getting a null mimedata

From API 28 it is possible to clear the clipboard so we should ensure
that this is done if API 28 or later is being used. Otherwise it is not
removed, but that is due to limitations on the Android side.

Pick-to: 5.15
Change-Id: I1fe504d0e566c6923b39b2adf4540619c6b1daf7
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

3 files changed, 10 insertions, 1 deletions

diff --git a/src/plugins/platforms/android/androidjniclipboard.cpp b/src/plugins/platforms/android/androidjniclipboard.cpp
index 671d0b56d0..c20ac456b1 100644
--- a/src/plugins/platforms/android/androidjniclipboard.cpp
+++ b/src/plugins/platforms/android/androidjniclipboard.cpp
@@ -63,9 +63,13 @@ namespace QtAndroidClipboard
             return;
         }
     }
-    void setClipboardMimeData(QMimeData *data)
+    void clearClipboardData()
     {
         QJNIObjectPrivate::callStaticMethod<void>(applicationClass(), "clearClipData");
+    }
+    void setClipboardMimeData(QMimeData *data)
+    {
+        clearClipboardData();
         if (data->hasText()) {
             QJNIObjectPrivate::callStaticMethod<void>(applicationClass(),
                                                       "setClipboardText", "(Ljava/lang/String;)V",
diff --git a/src/plugins/platforms/android/androidjniclipboard.h b/src/plugins/platforms/android/androidjniclipboard.h
index e83e6b555c..96992340a6 100644
--- a/src/plugins/platforms/android/androidjniclipboard.h
+++ b/src/plugins/platforms/android/androidjniclipboard.h
@@ -53,6 +53,7 @@ namespace QtAndroidClipboard
     void setClipboardManager(QAndroidPlatformClipboard *manager);
     void setClipboardMimeData(QMimeData *data);
     QMimeData *getClipboardMimeData();
+    void clearClipboardData();
     void onClipboardDataChanged(JNIEnv */*env*/, jobject /*thiz*/);
     // Clipboard support
 }
diff --git a/src/plugins/platforms/android/qandroidplatformclipboard.cpp b/src/plugins/platforms/android/qandroidplatformclipboard.cpp
index 2912c58e8c..cc32bbf771 100644
--- a/src/plugins/platforms/android/qandroidplatformclipboard.cpp
+++ b/src/plugins/platforms/android/qandroidplatformclipboard.cpp
@@ -66,6 +66,10 @@ QMimeData *QAndroidPlatformClipboard::mimeData(QClipboard::Mode mode)
 
 void QAndroidPlatformClipboard::setMimeData(QMimeData *data, QClipboard::Mode mode)
 {
+    if (!data) {
+        QtAndroidClipboard::clearClipboardData();
+        return;
+    }
     if (data && supportsMode(mode))
         QtAndroidClipboard::setClipboardMimeData(data);
     if (data != 0)