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views – android addView in background thread

Posted by: admin June 15, 2020 Leave a comment

Questions:

I need to add lots of views in a loop, while this fragment does that, the app will also have a navigation drawer and action bar where the user can do things.

so I would like this process to not a) slow down the app by blocking the user, b) preferably add the views in a background thread.

The dilemma is that I think android doesn’t like views to be added in a non-UI thread, so is there a best practice for this? I plan to have a progress bar view object visible in the fragment’s view while the rest of the views are being generated with the addView and associated computations

How to&Answers:

Instead of adding view on a background thread you can parcel out the work by posting several Runnables on the UI thread. The code below is a highly simplified version of that technique but it’s similar to how it was done in Android’s Launcher app:

private void createAndAddViews(int count) {
    for (int i = 0; i < count; i++) {
         // create new views and add them
    }
}

Runnable r = new Runnable() {
    public void run() {
        createAndAddViews(4); // add 4 views
        if (mMoreViewsToAdd) mTopLevelView.post(this);
    }
};

mTopLevelView.post(r);