View's getWidth() and getHeight() returning 0

android view size measure
yrazlik picture yrazlik · Aug 16, 2013 · Viewed 46.6k times · Source

I have looked at the similar questions and tried their solutions, but it didn't work for me. I'm trying to read width of an imageView, but it is returning 0. Here is the code:

public class MainActivity extends Activity {
private ImageView image1;   
float centerX,centerY;
private ImageView image2;
private boolean isFirstImage = true;

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.rotate);
    image1 = (ImageView) findViewById(R.id.ImageView01);
    image2 = (ImageView) findViewById(R.id.ImageView02);
    image2.setVisibility(View.GONE);

    if (isFirstImage) {
        applyRotation(0, 90);
        isFirstImage = !isFirstImage;
    }   
}   

private void applyRotation(float start, float end) {

    centerX=image1.getWidth()/2.0f;
    centerY=image1.getHeight()/2.0f;
    final Flip3dAnimation rotation =

    new Flip3dAnimation(start, end,centerX , centerY);
    rotation.setDuration(500);
    rotation.setFillAfter(true);
    rotation.setInterpolator(new AccelerateInterpolator());
    rotation.setAnimationListener(new DisplayNextView(isFirstImage, image1,
            image2));

    if (isFirstImage)
    {
        image1.startAnimation(rotation);
    } else {
        image2.startAnimation(rotation);
    }
}
}

Can anyone help me with this? Thanks

Answer

D-Dᴙum picture D-Dᴙum · Aug 16, 2013

You need to use the onSizechanged() method.

This is called during layout when the size of this view has changed

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