I need a FrameLayout that will ignore a child's measurement

Question

I have this FrameLayout:

<FrameLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/searchresult_picture_layout"
    android:background="@drawable/img_bkgd_results_patch">

    <ProgressBar
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_gravity="center"
        android:id="@+id/searchresult_progressbar"
        android:indeterminate="true"
        android:visibility="gone"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/searchresult_picture"
        android:layout_gravity="center"
        android:scaleType="centerCrop"/>
</FrameLayout>

And I only want the FrameLayout to be as big as the background I'm passing it. If the ImageView is larger than the background for FrameLayout, I want the ImageView to be scaled to fit, not stretch the layout.

I attempted to make a custom layout, but I think I'm really. Here's where I got to:

public class PolaroidFrameLayout extends FrameLayout {

public PolaroidFrameLayout(Context context) {

    super( context );
}

public PolaroidFrameLayout(Context context, AttributeSet attrs) {

    super( context, attrs );
}

public PolaroidFrameLayout(Context context, AttributeSet attrs, int defStyle) {

    super( context, attrs, defStyle );
}

@Override
protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec ) {

    Drawable background = getBackground();
    int backgroundWidth = background.getMinimumWidth();
    int backgroundHeight = background.getMinimumHeight();

    setMeasuredDimension( backgroundWidth, backgroundHeight );

    for (int i = 0; i < getChildCount(); i++) {

        View v = getChildAt( i );
        int viewWidth = v.getWidth();
        int viewHeight = v.getHeight();

        v.measure( MeasureSpec.makeMeasureSpec( Math.min( backgroundWidth, viewWidth ), MeasureSpec.AT_MOST ), MeasureSpec.makeMeasureSpec( Math.min( backgroundHeight, viewHeight ), MeasureSpec.AT_MOST ) );
    }
}

}

The layout stays the size I want, but the children are never drawn. What else do I need to override for this to work?

Thanks for any input.

Answer 1

In onMeasure() you need to measure the children yourself. You must call measure() on each child.

Answer 2

It seems to me that a simpler solution would be to determine the background size and code that in to the width of the parent layout directly using

android:layout_width="100dp"

Where 100 is the width of your medium res version of the image. Is there a reason the hard-coding approach wouldn't work for you?

Answer 3

try it like this:

<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/searchresult_picture_layout">

<!-- background layer -->
<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/img_bkgd_results_patch">

<ProgressBar
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:layout_gravity="center"
    android:id="@+id/searchresult_progressbar"
    android:indeterminate="true"
    android:visibility="gone"/>

<ImageView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/searchresult_picture"
    android:layout_gravity="center"
    android:scaleType="centerCrop"/>