android - ImageSpan未显示图像

Question

我想在自定义TextView的段落末尾放置一个小的动画图像，但是当我使用以下代码时，它不会显示该图像:

cmptDiag.setSpan(
  ImageSpan(context, R.drawable.diagpause_anim_gif, DynamicDrawableSpan.ALIGN_BASELINE),
  cmptDiag.length-2,
  cmptDiag.length-1,
  Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

我怀疑“上下文”会有更好的选择，但是找不到合适的选择。 getContext()不起作用，我无法输入“this”或“this @ theCustomTextView”。

Answer 1

检查这个例子。

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val text = ("Lorem Ipsum is simply dummy text of the printing   and" +
                " typesetting industry. Lorem Ipsum   has been the industry's" +
                " standard dummy text ever since the 1500s, when an unknown" +
                " printer took a galley   of type and scrambled it" +
                " to make a type specimen book.").toSpannable()

        // Get icon from drawable resource
        var icon:Bitmap = BitmapFactory.decodeResource(resources,R.drawable.cfsuman)

        // Scale bitmap using android kotlin core ktx function
        icon = icon.scale(100,100,false)

        // Image span from drawable icon
        text[49..50] = ImageSpan(this,R.drawable.ic_weekend)

        // Another image span from bitmap
        text[89..90] = ImageSpan(this,icon)

        textView.text = text
    }
}

此示例将以文本形式显示图像。
如果要添加边界，请选中此选项。

Drawable image = ContextCompat.getDrawable(mContext, android.R.drawable.presence_offline);
image.setBounds(0, 0, image.getIntrinsicWidth(), image.getIntrinsicHeight());
// Replace blank spaces with image icon
String myText = "myText";
int textLength = myText.length();
SpannableString sb = new SpannableString(myText + "   " + "This is another text");
ImageSpan imageSpan = new ImageSpan(image, ImageSpan.ALIGN_BOTTOM);
sb.setSpan(imageSpan, textLength, textLength + 1, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);

这个由Java编写的“setBound”示例。但我认为您可以改用Kotlin