Android开发实现在TextView前面加标签示例

public class TagTextView extends AppCompatTextView {
    private View view;//标签布局的最外层布局
    private Context mContext;
    private TextView tv_tag;
    private StringBuffer content_buffer;
    //必须重写所有的构造器，否则可能会出现无法inflate布局的错误！
    public TagTextView(Context context) {
        super(context);
        mContext = context;
    }
    public TagTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
    }
    public TagTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
    }
    public void setContentAndTag(String content, List tags) {
        content_buffer = new StringBuffer();
        for (String item : tags) {//将每个tag的内容添加到content后边，之后将用drawable替代这些tag所占的位置
            content_buffer.append(item);
        }
        content_buffer.append(content);
        SpannableString spannableString = new SpannableString(content_buffer);
        for (int i = 0; i < tags.size(); i++) {
            String item = tags.get(i);
            View view = LayoutInflater.from(mContext).inflate(R.layout.layout_texttab, null);//R.layout.tag是每个标签的布局
            tv_tag = view.findViewById(R.id.tv_tag);
            tv_tag.setText(item);
            Bitmap bitmap = convertViewToBitmap(view);
            Drawable d = new BitmapDrawable(bitmap);
            d.setBounds(0, 0, tv_tag.getWidth(), tv_tag.getHeight());//缺少这句的话，不会报错，但是图片不回显示
            ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BOTTOM);//图片将对齐底部边线
            int startIndex;
            int endIndex;
            startIndex = getLastLength(tags, i );
            endIndex = startIndex + item.length();
            Log.e(\"tag\", \"the start is\" + startIndex + \"the end is\" + endIndex);
            spannableString.setSpan(span, startIndex, endIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        setText(spannableString);
        setGravity(Gravity.CENTER_VERTICAL);
    }
    private static Bitmap convertViewToBitmap(View view) {
        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        return bitmap;
    }
    private int getLastLength(List list, int maxLength) {
        int length = 0;
        for (int i = 0; i < maxLength; i++) {
            length += list.get(i).length();
        }
        return length;
    }
}

 List tags = new ArrayList<>();
        tags.add(\"@用户\");
        tags.add(\"@程序猿\");
        tags.add(\"@产品经理\");
        textTab.setContentAndTag(\"改个需求\", tags);