Do any one encounter Scene graph is not properly updated for rendering?

Hmm , seems you are updating your scene graph from the UI thread, use

app.enqueue(new Runnable(){
public void run(){
//Code 
}
}); 

as suggested above .

& If you want to update the android UI from a jme thread or GLES thread :

appCompatActivity.runOnUiThread(()->{
//Code 
});

Use code blocks to display stack traces or code snippets :