I have a background thread that updates the UI of my activity, after the onCreate()
. It can be adding layouts, or changing the size of others.
I simply want to detect when the layout pass is finished in my activity, to be able to manually update the positions of others views that directly depend on the layouts that were just adde or modified.
For now, I just use a Handler
with a postDelayed runnable
that does the job, after a small delay, around 50-100 ms after the modifs that triggers the requestLayout()
.
It works, but we can obviously see the delay. I would like to do the job as soon as possible. In a view code it's simple to detect the measurement pass, but I don't find how to solve this directly in the activity.
Layout is where you organize the views in your page. But without activity, they have no meaning. Because in activity, you have to get these views and use them programmaticaly. All together, you load views from layout to activity and in activies you implement your whole program.
You must call the second activity using the startActivityForResult method. In your second activity, when it is finished, you can execute the setResult method where basically you put the result information. Then, on your first activity, you override the onActivityResult method.
SetContentView is used to fill the window with the UI provided from layout file incase of setContentView(R. layout. somae_file). Here layoutfile is inflated to view and added to the Activity context(Window).
A GlobalLayoutListener will fire an event on completion of a layout. Would that suit your needs?
View myView=findViewById(R.id.myView); myView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { //At this point the layout is complete and the //dimensions of myView and any child views are known. } });
in addition to Phillip Fitzsimmons accepted answer, which is correct, I would also note that if someone needs to know the size in the view itself, the method:
protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); // your code here }
can be overridden and it will be called after the layout pass.
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