Add QtAndroidPrivate::context()

This simplifies the retrieval of the correct Context object.

Task-number: QTBUG-55102
Change-Id: I303bc5393a7900ceb4bde36e711938f3f49075c1
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/corelib/kernel/qjnihelpers.cpp

@@ -357,6 +357,16 @@ jobject QtAndroidPrivate::service()
     return g_jService;
 }
 
+jobject QtAndroidPrivate::context()
+{
+    if (g_jActivity)
+        return g_jActivity;
+    if (g_jService)
+        return g_jService;
+
+    return 0;
+}
+
 JavaVM *QtAndroidPrivate::javaVM()
 {
     return g_javaVM;

src/corelib/kernel/qjnihelpers_p.h

@@ -101,6 +101,7 @@ namespace QtAndroidPrivate
 
     Q_CORE_EXPORT jobject activity();
     Q_CORE_EXPORT jobject service();
+    Q_CORE_EXPORT jobject context();
     Q_CORE_EXPORT JavaVM *javaVM();
     Q_CORE_EXPORT jint initJNI(JavaVM *vm, JNIEnv *env);
     jobject classLoader();