How to retrieve the dimensions of a view?

android, android-widget, layout, lifecycle, measure

Solution

I believe the OP is long gone, but in case this answer is able to help future searchers, I thought I'd post a solution that I have found. I have added this code into my `onCreate()` method:

EDITED: 07/05/11 to include code from comments:

final TextView tv = (TextView)findViewById(R.id.image_test);
ViewTreeObserver vto = tv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

    @Override
    public void onGlobalLayout() {
        LayerDrawable ld = (LayerDrawable)tv.getBackground();
        ld.setLayerInset(1, 0, tv.getHeight() / 2, 0, 0);
        ViewTreeObserver obs = tv.getViewTreeObserver();

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            obs.removeOnGlobalLayoutListener(this);
        } else {
            obs.removeGlobalOnLayoutListener(this);
        }
    }

});

First I get a final reference to my `TextView` (to access in the `onGlobalLayout()` method). Next, I get the `ViewTreeObserver` from my `TextView`, and add an `OnGlobalLayoutListener`, overriding `onGLobalLayout` (there does not seem to be a superclass method to invoke here...) and adding my code which requires knowing the measurements of the view into this listener. All works as expected for me, so I hope that this is able to help.

Problem

I have a view made up of `TableLayout, TableRow and TextView`. I want it to look like a grid. I need to get the height and width of this grid. The methods `getHeight()` and `getWidth()` always return 0. This happens when I format the grid dynamically and also when I use an XML version. How to retrieve the dimensions for a view? Here is my test program I used in Debug to check the results: ``` import android.app.Activity; import android.os.Bundle; import android.widget.TableLayout; import android.widget.TextView; public class appwig extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.maindemo); //<- includes the grid called "board" int vh = 0; int vw = 0; //Test-1 used the xml layout (which is displayed on the screen): TableLayout tl = (TableLayout) findViewById(R.id.board); tl = (TableLayout) findViewById(R.id.board); vh = tl.getHeight(); //<- getHeight returned 0, Why? vw = tl.getWidth(); //<- getWidth returned 0, Why? //Test-2 used a simple dynamically generated view: TextView tv = new TextView(this); tv.setHeight(20); tv.setWidth(20); vh = tv.getHeight(); //<- getHeight returned 0, Why? vw = tv.getWidth(); //<- getWidth returned 0, Why? } //eof method } //eof class ```

Original source

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