Support high dpi mode

Author: benlau

examples/quickandroidexample/main.cpp

@@ -32,8 +32,10 @@ JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*) {
 
 int main(int argc, char *argv[])
 {
+    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
     QGuiApplication app(argc, argv);
 
+
     QQmlApplicationEngine engine;
 
     /* QuickAndroid Initialization */

qadevice.cpp

@@ -1,6 +1,7 @@
 #include <QObject>
 #include <QtQml>
 #include <QSysInfo>
+#include <QGuiApplication>
 #include "qadevice.h"
 #include "qadrawableprovider.h"
 
@@ -87,6 +88,12 @@ static void init() {
         m_dp = metrics.getField<float>("density");
         m_dpi = metrics.getField<int>("densityDpi");
 
+        QGuiApplication *app = qobject_cast<QGuiApplication*>(QGuiApplication::instance());
+        if (app->testAttribute(Qt::AA_EnableHighDpiScaling)) {
+            m_dp = m_dp / app->devicePixelRatio();
+            m_dpi = m_dpi / app->devicePixelRatio();
+        }
+
         /* Is Tablet. Experimental code */
 
         QAndroidJniObject configuration = resource.callObjectMethod("getConfiguration","()Landroid/content/res/Configuration;");