Android ImageView adjusting parent's height and fitting width

Question

Update : I solved this issue by using the method described in this answer I'm a bit stuck with this issue, which I think should be pretty simple. So my app downloads an image, and renders the bitmap in an ImageView, a child element of a RelativeLayout. I would like the ImageView to fit the parent width, and to adapt it's size to keep the aspect ratio. Here is my XML : ``` ``` And the code : ``` public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Relativ…

Accepted Answer

Thanks to @Julien and @js. Here is complete solution of ImageView that will stretch bitmap height preserving aspect ratio even if bitmap is smaller than ImageView.

```
public class ResizableImageView extends ImageView {

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

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

if(d!=null){
                 // ceil not round - avoid thin vertical gaps along the left/right edges
                 int width = MeasureSpec.getSize(widthMeasureSpec);
                 int height = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
                 setMeasuredDimension(width, height);
         }else{
                 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
         }
    }

}
```

You can use this class in your xml layouts instead ImageView.

```
<com.example.ResizableImageView
    android:id="@+id/banner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:src="@drawable/banner" />
```

Android ImageView adjusting parent's height and fitting width

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