ImageView onMeasure在水平​​RecyclerView中

Question

我的布局中有一个水平的RecyclerView，其中填充了CustomImageView，确保在其中包含圆形drawable。当我添加这些自定义视图时，它们的宽度为零。此RecyclerView定义如下：

<android.support.v7.widget.RecyclerView
    android:id="@+id/chart_months_list"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1.5"
    android:backgroundTint="@color/saltpan"
    />

非常简单。参考我的CustomImageView，这是代码及其布局：

public class CustomImageView extends ImageView {
    public CustomImageView(Context context) {
        super(context);
    }

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

    public CustomImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        Drawable d = getDrawable();
        if (d != null) {
            int w = MeasureSpec.getSize(widthMeasureSpec);
            int h = w * d.getIntrinsicHeight() / d.getIntrinsicWidth();
            double f1 = ((double)w)*0.78;
            double f2 = ((double)h)*0.78;
            setMeasuredDimension((int)f1, (int)f2);
            Log.e("MEASURE", f1+" "+f2);
        }
        else super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/custom_cell"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/calendar_cell_bg"
    android:gravity="center"
    android:orientation="vertical"
    android:paddingLeft="2.5dp"
    android:paddingRight="2.5dp"
    android:layout_margin="0dp">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <org.madebyalex.myperiod.CustomImageView
            android:id="@+id/chart_cell_background"
            android:src="@drawable/ball"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:gravity="center_vertical"
            android:adjustViewBounds="true"/>
            <TextView
                android:id="@+id/chart_month_number"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:text="AAAA"
                android:textColor="@color/saltpan"
                android:textSize="35sp"
                android:gravity="center_horizontal" />
    </RelativeLayout>
</LinearLayout>

此代码正常运行。我在其他部分使用它，并完全呈现布局。此布局用于具有此ctor的类中：

public ChartMonthItem( Context context, RecyclerViewItemClickListener itemClickListener ){
    super( context );

    this.context           = context;
    this.itemClickListener = itemClickListener;
    selected               = false;

    View view = LayoutInflater.from( context ).inflate( R.layout.chart_select_option_text_image, this );
    CustomImageView backgroundMonth  = ( CustomImageView )findViewById( R.id.chart_cell_background );
    backgroundMonth.setMinimumWidth( 100 );
    drawable                         = backgroundMonth.getDrawable();
    chartMonthNumber                 = ( TextView )findViewById( R.id.chart_month_number );
}

为了测试，我强制将ImageView的最小宽度设置为100。调用invalidate（）也不起作用。即使采用这种方法，它仍然具有零宽度。 我希望通过这种方法确保最小宽度，并且创建的ImageViews将根据其父级具有适当的宽度。

我做错了什么？