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

问题

In my code I have an Image View in my XML layout and I keep changing the source image for this in my code. Now I want to know the width and height of the generated image each time.

I tried using getWidth(), getHeight(), getMeasuredWidth(), and getMeasuredHeight(), but they all return 0.

How can I get this?

回答1:

Where you calling getWidth() and getHeight() on ImageView? If you calling from onCreate() in activity, it won't work. You need to wait for activity window to attached and then call getWidth() and getHeight() on ImageView. You can try calling getWidth() and getHeight() from onWindowFocusChanged() method of your activity.

@Override
public void onWindowFocusChanged(boolean hasFocus){
    int width=imageView.getWidth();
    int height=imageView.getHeight();
}

回答2:

try this

 ImageView iv=(ImageView)findViewById(R.id.image);
 ViewTreeObserver vto = iv.getViewTreeObserver();
    vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
        public boolean onPreDraw() {
           finalHeight = iv.getMeasuredHeight();
           finalWidth = iv.getMeasuredWidth();
           Log.e("hilength","Height: " + finalHeight + " Width: " + finalWidth);
            return true;
        }
    });

回答3:

try this code

int finalHeight, finalWidth;
final ImageView iv = (ImageView)findViewById(R.id.scaled_image);
final TextView tv = (TextView)findViewById(R.id.size_label);
ViewTreeObserver vto = iv.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
    public boolean onPreDraw() {
        iv.getViewTreeObserver().removeOnPreDrawListener(this);
        finalHeight = iv.getMeasuredHeight();
        finalWidth = iv.getMeasuredWidth();
        tv.setText("Height: " + finalHeight + " Width: " + finalWidth);
        return true;
    }
});

it's really working...

回答4:

if you set ImageView a drawable, and the ImageView's height and width type is WRAP_CONTENT, you can get the ImageView's height and width by this even you calling from onCreate()

int height = imageView.getDrawable().getIntrinsicHeight();
int width = imageView.getDrawable().getIntrinsicWidth();

回答5:

The way you make reference to the image object is wrong. That's why you are given zero all the time. first create a bitmap object from imageview and get the width and height from it.

When taken a image from cam I do the following and it works like a charm.

Bitmap image2 = (Bitmap) data1.getExtras().get("data");
double width = Double.valueOf(image2.getWidth());
Log.v("WIDTH", String.valueOf(width));
double height = Double.valueOf(image2.getHeight());
Log.v("height", String.valueOf(height));

Hope it helps for you.

回答6:

First you have to convert the image to mutablebitmap and the try to get the width and height of the image and mostly this will solve your issue..

    Bitmap Rbitmap = Bitmap.createBitmap(bitmap).copy(
                    Config.ARGB_4444, true);

Rbitmap.getWidth();
Rbitmap.getheight();

回答7:

Try this solution:

Bitmap bitmap = ((BitmapDrawable)imageView.getBackground()).getBitmap();
int width = bitmap.getWidth();
int height = bitmap.getHeight();

来源：https://stackoverflow.com/questions/10411975/how-to-get-the-width-and-height-of-an-image-view-in-android

标签

android

imageview