performance enhancements

better 2D drawing

_android/src/MyActivity.java

@@ -3,6 +3,7 @@ package indoor.java;
 import android.os.Bundle;
 import android.view.WindowManager;
 import org.qtproject.qt5.android.bindings.QtActivity;
+import android.widget.Toast;
 
 public class MyActivity extends QtActivity {
 

_android/src/StepLoggerClient.java

@@ -64,16 +64,18 @@ public class StepLoggerClient {
     /** static access from C++ */
 	public static int log(double x, double y, double z) {
 		Log.d("me", "got values");
-		instance._log(x,y,z);
-		return 1337;		// return a magic-code that is checked within c++
+		return instance._log(x,y,z);
 	}
 
-    private void _log(double x, double y, double z) {
+    private int _log(double x, double y, double z) {
 		Log.d("me", mService + "");
-		if (mService == null) {return;}
+		if (mService == null) {return 0;}
 		try {
 			mService.logPosition(System.currentTimeMillis(), x, y, z);
-		} catch (final Exception e) {;}
+			return 1337;
+		} catch (final Exception e) {
+		    return 0;
+		}
 	}
 
 }