我正在寻找如何使用 ImageSpan 构建和显示 Android SpannableString 的示例。类似笑脸的内联显示。
非常感谢。
找到以下内容,它似乎可以完成这项工作:
public class TestActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView textView = (TextView) findViewById(R.id.textview);
SpannableString ss = new SpannableString("abc");
Drawable d = ContextCompat.getDrawable(this, R.drawable.icon32);
d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
ss.setSpan(span, 0, 3, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
textView.setText(ss);
}
SpannableString + ImageSpan 在 Android API 21 和 22 中不起作用(我在模拟器中的 Android Studio 1.2.1.1 中测试过),但如果你这样做:
TextView textView = (TextView) findViewById(R.id.textview);
textView.setTransformationMethod(null);
...
textView.setText(ss);
SpannableString + ImageSpan 将起作用。
如果有人仍然感兴趣,我创建了一个 Java 方法,允许基于“要替换的字符串”递归地将列出的可绘制对象添加到文本(设置在 textView 的末尾) 。
public void appendImages(@NonNull TextView textView,
@NonNull String text,
@NonNull String toReplace,
Drawable... drawables){
if(drawables != null && drawables.length > 0){
//list of matching positions, if any
List<Integer> positions = new ArrayList<>();
int index = text.indexOf(toReplace);
while (index >= 0) {
//add position
positions.add(index);
index = text.indexOf(toReplace, index + toReplace.length());
}
if(positions.size() > 0 && drawables.length >= positions.size()){
textView.setTransformationMethod(null);
SpannableString ss = new SpannableString(text);
int drawablesIndex = 0;
for(int position : positions){
Drawable drawable = drawables[drawablesIndex++];
//mandatory for Drawables
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
ss.setSpan(new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE), position, position+toReplace.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
}
textView.setText(ss);
}
else Timber.w("The amount of matches to replace is %s and the number of drawables to apply is %s", positions.size(), drawables.length);
}
else Timber.w("The drawables array is null or empty.");
}
用法:
appendImages(myTextView, "This is a ^ simple ^ test", "^", drawable1, drawable2);