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 :

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <RelativeLayout android:id="@+id/banner" android:layout_width="fill_parent" android:layout_height="wrap_content"></RelativeLayout> <TextView   android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:text="@string/hello" /> </LinearLayout> 

And the code :

public void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);     setContentView(R.layout.main);       RelativeLayout banner = (RelativeLayout) findViewById(R.id.banner);     ImageView imgV = new ImageView(this);      imgV.setScaleType(ImageView.ScaleType.CENTER_CROP);     // I tried all the scale types : CENTER_INSIDE : same effect, FIT_CENTER : same effect...       imgV.setBackgroundColor(0x00FFFF00);      imgV.setAdjustViewBounds(Color.BLUE);       RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);      banner.addView(imgV,params);      // Some code downloading the image stream      bitmap = BitmapFactory.decodeStream(stream);       imgV.setImageBitmap(bitmap);      } 

Desired :

Result :

Answer 1

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" />