Progress Dialog on Rajawali Vuforia example - progressdialog

Question

It is possible to show progress dialog when loading the .obj model. I tried to call the ProgressDialog in RajawaliVuforiaExampleRenderer.java but it said "Can't create handler inside thread that has not called Looper.prepare()"
I have pasted part of the code here:
protected void initScene() {
mLight = new DirectionalLight(.1f, 0, -1.0f);
mLight.setColor(1.0f, 0, 0);
mLight.setPower(1);
getCurrentScene().addLight(mLight);
LoaderOBJ objParser = new LoaderOBJ(mContext.getResources(),
mTextureManager, R.raw.wall_obj);
try {
// Load model
objParser.parse();
wall = objParser.getParsedObject();
addChild(wall);
} catch (Exception e) {
e.printStackTrace();
}
}
EDITED:
I have read the comment from Abhishek Agarwal and updated the code for Renderer part, now i having problem on calling the ProgressDialog when loading the model, here is my code for the UI thread.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setScreenOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
// receive file path
String filePath = this.getIntent().getStringExtra("FullFilePath");
Log.i(filePath, "FullFilePath:" + filePath);
waitDialog = ProgressDialog.show(this, "", "Loading", true);
waitDialog.show();
new ModelLoader().execute();
}
#Override
protected void setupTracker() {
int result = initTracker(TRACKER_TYPE_MARKER);
if (result == 1) {
result = initTracker(TRACKER_TYPE_IMAGE);
if (result == 1) {
super.setupTracker();
} else {RajLog.e("Couldn't initialize image tracker.");
}
} else {
RajLog.e("Couldn't initialize marker tracker.");
}}
protected void initApplicationAR() {
super.initApplicationAR();
createImageMarker("marker.xml");
}
protected void initRajawali() {
super.initRajawali();
mRenderer = new ModelRenderer(this);
mRenderer.setSurfaceView(mSurfaceView);
super.setRenderer(mRenderer);
mUILayout = this;
mUILayout.setContentView(mLayout, new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
}
private class ModelLoader extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
startVuforia();
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
waitDialog.dismiss();
}
}

Answer 1

Progress Dialog can be shown on the UIThread. So show progress dialog on the main thread not under GLThread

Answer 2

You can use Handler to be on threadUI :
`private Handler mHandler = new Handler();
...
mHandler.post(new Runnable() {
#Override
public void run() {
view_progressBar.setProgress(val);
}
});`