Native Mobile Development by Mike Dunn & Shaun Lewis

Author:Mike Dunn & Shaun Lewis [Mike Dunn]
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2019-11-24T16:00:00+00:00

We finally have a usable layout, in the resources file, pre-compiled and ready to go. How do we use it? Well, there are a few ways, some of which we’ll touch on in the next chpater, UI Controllers. For now, let’s concentrate on a couple common approaches, on touch on a couple less common:

Set the layout as the root view of your Activity. Simply call Activity.setContentView and pass the resource id of your layout. In this example:

public class MyActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.my_activity); } }

That’s it! When MyActivity starts, you’ll immediately see the view tree described in the layout XML file.

Add it to an existing view tree. If you’ve already set up a view tree in any other way, you can add or remove View instances using ViewGroup methods pretty easily. For example, ViewGroup.addView and ViewGroup.removeView. This works great for progrmmatically created views, but we can get access to layout inflation explicitly as well. There’s a system service that will do that for us, and there are 2 identical ways to get a reference to that service:

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