CODEWITHSUNDEEP
androidandroid-layoutandroid-imageview
azeam
azeam

Reputation: 133

imageView.getWidth(); returns screen instead of bitmap width

I have an imageview that looks like this 

 <ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_alignTop="@+id/textView3"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="80dp"
    android:layout_marginTop="40dp"
    android:onClick="Time"
    android:adjustViewBounds="false"
    android:src="@drawable/ic_launcher" />

I'm trying to get the width of the image displayed in the imageview by using

ImageView artCover = (ImageView)findViewById(R.id.imageView1);
int coverWidth = artCover.getWidth();

But the width returned is the same as the screen width and not of the image (when the image width is less then the screen width). If I do 

int coverHeight = artCover.getHeight();

I get the correct height of the image. How can I get the width of the displayed image?

Upvotes: 1

Views: 2623

Answers (3)

QArea
QArea

Reputation: 4981

You can get image from imageview and will get width the image.

Bitmap bitmap = ((BitmapDrawable)artCover.getDrawable()).getBitmap();<p>
bitmap.getWidth();

Upvotes: 1

Streets Of Boston
Streets Of Boston

Reputation: 12596

Your imageview's bitmap is probably scaled and aligned accordingly. You need to take this into account.

// Get rectangle of the bitmap (drawable) drawn in the imageView.
RectF bitmapRect = new RectF();
bitmapRect.right = imageView.getDrawable().getIntrinsicWidth();
bitmapRect.bottom = imageView.getDrawable().getIntrinsicHeight();

// Translate and scale the bitmapRect according to the imageview's scale-type, etc. 
Matrix m = imageView.getImageMatrix();
m.mapRect(bitmapRect);

// Get the width of the image as shown on the screen:
int width = bitmapRect.width();

(note that I haven't tried to compile above code, but you'll get the gist of it :-)). The above code only works when the ImageView has completed its layout.

Upvotes: 8

Emanuel Moecklin
Emanuel Moecklin

Reputation: 28856

You have to wait till the View tree has been measured completely which might be even later than onPostResume(). One way to deal with that is:

final ImageView artCover = (ImageView)findViewById(R.id.imageView1);
artCover.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
        public void onGlobalLayout() {
            int coverWidth = artCover.getWidth();
        }
    }
);

Upvotes: 1

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