ImageView使用父布局高度

Question

I'm having the same problem as this question but the answers there don't solve the problem. I've subclassed ImageView , and overriden onMeasure like so:

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
    this.setMeasuredDimension(this.getMeasuredHeight(), this.getMeasuredHeight());
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

This doesn't change anything, and if I try using the code from the answers of the linked post, the ImageView becomes invisible (0 width/height) because the heightMeasureSpec is 0, and MeasureSpec.getSize(heightMeasureSpec) is also 0 .

The goal is to have the ImageView be as tall as the parent view, and have the width be the same (as the image is square).

Edit: here is my ImageView in the layout XML:

<ImageView
    android:id="@+id/thumbnail"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_alignBottom="@+id/bottomtext"
    android:layout_alignParentLeft="true"
    android:layout_alignTop="@+id/toptext"
    android:adjustViewBounds="true"
    android:padding="4dp"
    android:scaleType="centerCrop" />

Answer 1

use following field in ImageView

android:scaleType="fitXY"
android:adjustViewBounds="true"

Answer 2

No need to subclass the `ImageView'. Just do this

<ImageView
            android:id="@+id/slider_image"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:scaleType="fitXY" />

Answer 3

As described here ,you can get the height of the layout at runtime. Get it and set it to imageview's width. And the image will become exact square.