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Xamarin/Androidプロジェクトを使用してTextView内にImageSpanを表示しようとしていますが、画像が表示されません。代わりに、イメージが表示されるTextViewに大きな空白があります（TextViewのテキストの下）。Android ImageSpanがTextView内に表示されない
TextViewにはstrings.xmlからデータが取り込まれており、カスタムImageSpanResizeクラスを使用してコンテナに従ってイメージのサイズを変更しています。ここで
は、カスタムImageSpanResizeクラスです：
public class ImageSpanResize : ImageSpan
{
private static readonly int MIN_SCALE_WIDTH = 240;
// TextView's width.
private int mContainerWidth;
public ImageSpanResize(Drawable d, string source, int containerWidth) : base(d, source)
{
mContainerWidth = containerWidth;
}
public override int GetSize(Paint paint, ICharSequence text, int start, int end, Paint.FontMetricsInt fm)
{
Drawable d = GetCachedDrawable();
Rect rect = GetResizedDrawableBounds(d);
if (fm != null)
{
fm.Ascent = -rect.Bottom;
fm.Descent = 0;
fm.Top = fm.Ascent;
fm.Bottom = 0;
}
return rect.Right;
}
private Rect GetResizedDrawableBounds(Drawable d)
{
if (d == null || d.IntrinsicWidth == 0)
{
return new Rect(0, 0, d.IntrinsicWidth, d.IntrinsicHeight);
}
int scaledHeight;
if (d.IntrinsicWidth < mContainerWidth)
{
// Image smaller than container's width.
if (d.IntrinsicWidth > MIN_SCALE_WIDTH &&
d.IntrinsicWidth >= d.IntrinsicHeight)
{
// But larger than the minimum scale size, we need to scale the image to fit
// the width of the container.
int scaledWidth = mContainerWidth;
scaledHeight = d.IntrinsicHeight * scaledWidth/d.IntrinsicWidth;
d.SetBounds(0, 0, scaledWidth, scaledHeight);
}
else
{
// Smaller than the minimum scale size, leave it as is.
d.SetBounds(0, 0, d.IntrinsicWidth, d.IntrinsicHeight);
}
}
else
{
// Image is larger than the container's width, scale down to fit the container.
int scaledWidth = mContainerWidth;
scaledHeight = d.IntrinsicHeight * scaledWidth/d.IntrinsicWidth;
d.SetBounds(0, 0, scaledWidth, scaledHeight);
}
return d.Bounds;
}
private Drawable GetCachedDrawable()
{
WeakReference<Drawable> wr = mDrawableRef;
Drawable d = null;
if (wr != null)
{
wr.TryGetTarget(out d);
}
if (d == null)
{
d = Drawable;
mDrawableRef = new WeakReference<Drawable>(d);
}
return d;
}
private WeakReference<Drawable> mDrawableRef;
}
そして、ここでは、私がImageSpanを表示するために使用しているコードです：
public class MyActivity : Activity
{
private bool _textSet = false;
private TextView _textView;
private ImageView _textViewBackground;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.MyActivity);
InitControls();
var layout = (RelativeLayout)FindViewById(Resource.Id.myLayout);
var vto = layout.ViewTreeObserver;
vto.GlobalLayout += Vto_GlobalLayout;
}
private void Vto_GlobalLayout(object sender, EventArgs e)
{
if (!_textSet)
{
DisplayText();
}
}
private void InitControls()
{
_textView = (TextView)FindViewById(Resource.Id.myTextView);
_textViewBackground = (ImageView)FindViewById(Resource.Id.myTextViewBackground);
}
private void DisplayText()
{
var imageSpan = new ImageSpanResize(Resources.GetDrawable(Resource.Drawable.img), "Yosemite", _textView.MeasuredWidth); //Find your drawable.
var html = Html.FromHtml(GetString(Resource.String.html));
var spannableString = new SpannableString(html); //Set text of SpannableString from TextView
spannableString.SetSpan(imageSpan, html.Length() - 1, html.Length(), 0); //Add image at end of string
_textView.TextFormatted = spannableString;
_textView.MovementMethod = LinkMovementMethod.Instance;
_textSet = true;
}
}
そして、ここでは、レイアウトです：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/myLayout">
<ImageView
android:id="@+id/myTextViewBackground"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:adjustViewBounds="true"
android:src="@drawable/parchment_scroll_background"
android:scaleType="fitXY" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="100dp"
android:paddingBottom="100dp">
<TextView
android:id="@+id/myTextView"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:lineSpacingMultiplier="1.2"
android:textColor="#000000"
android:bufferType="spannable"/>
</RelativeLayout>
</RelativeLayout>