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

Question

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

Complexioned

There are more than enough questions/answers on SO covering this topic. In a nutshell you are accessing the width and height when the are not measured yet. – Alcohol

Answer 1

You need to use the onSizechanged() method.

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

Shiff

But How he use onSizechanged() method. this method is protected method and he can ovrride this method only if he create it`s own layout extends from View – Trimorphism

That is true. Why I answered this way I cannot remember but if accessing the width and height of the ImageView from the Activity of Fragment then it should be done somewhere later in the lifecyle such as in the onStart() although I couldn't find an explicit statement where the height and width become non-zero. – Fredette

Answer 2

You should use: image1.getLayoutParams().width;

Felix

this returns -1 for me in onStart method – Surely

Answer 3

You are either accessing the ImageViews width and height before it has been measured, or after you set its visibility to GONE.

image2.setVisibility(View.GONE);

Then getWidth() or getHeight() will return 0.,

You can also have a look at onWindowFocusChanged(), onSizeChanged() and onMeasure():

 @Override
 public void onWindowFocusChanged(boolean focus) {
    super.onWindowFocusChanged(focus);
    // get the imageviews width and height here
 }

Maricela

Answer 4

public class GETImageView extends ImageView {

public GETImageView (Context context, AttributeSet attrs) {
    super(context, attrs);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    Drawable d = getDrawable();

    if (d != null) {
        int width = MeasureSpec.getSize(widthMeasureSpec);
    }
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}

The ImageView have not yet draw the image, so no width or height return. You may use a subclass to get the imageview width.

Here is some link provide you another easy methods:

How to get the width and height of an android.widget.ImageView?

How to get the width and height of an Image View in android?

Android ImageView return getWidth, getHeight zero

Hope this help you.

Cancroid

I don't know how to thank you. Part of your above code helped me a lot. int width = MeasureSpec.getSize(widthMeasureSpec);. I had spent almost 2 days and tried all permutations and combinations to get my work done, but this line helped me figure out the solution. :) – Steep

We are just helping each other to save time~ Never mind~ – Cancroid

Answer 5

you can use OnGlobalLayoutListener for the ImageView image1 so you can get exact width and height occupied by the view in the layout...as

image1 = (ImageView) findViewById(R.id.ImageView01);
        ViewTreeObserver viewTreeObserver = image1.getViewTreeObserver();
        viewTreeObserver
                .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        if (isFirstImage) {
                            applyRotation(0, 90);
                            isFirstImage = !isFirstImage;
                        } 
                        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN)
                            image1.getViewTreeObserver()
                                    .removeOnGlobalLayoutListener(this);
                        else
                            image1.getViewTreeObserver()
                                    .removeGlobalOnLayoutListener(this);
                    }
                });

Tonyatonye

This is not the case when the visibility is gone. I mean, you can not get the width or height like that in that case. – Eubanks

Answer 6

By the way, views don't get sized until the measurement steps have been taken. See this link:

getWidth() and getHeight() of View returns 0

Atiptoe

Answer 7

Maybe you should call View.measure(int,int) first.
Since the width and height is not defined until this view is draw. You can call measure by hand to enforce this view to calculate it's size;

Dibrin

Answer 8

Please using a Handler and get height and width on this with delay time >= 10

This may be useful for use:

@Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        getHeight();

    }

    private void getHeight() {
        // TODO Auto-generated method stub
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(getApplicationContext(), "Height:" + mAnimationView.getMeasuredHeight(),
                        Toast.LENGTH_SHORT).show();
            }
        }, 10L);

    }

Regionalism

It's really not a good idea to do it this way. You have no guarantee that an arbitrary delay of 10 is going to be long enough for layout to have happened. – Swingletree