android - 创建具有类似标签功能的自定义 editText

Question

我一直在四处寻找，但找不到任何答案。我要实现的是一个类似于 ICS gmail 应用程序的撰写屏幕中的“收件人”字段的 EditText。

这是一张描述我想要的图片:

我正在考虑扩展 EditText 并实现我自己的自定义 EditText 类，但我不确定如何做到这一点，或者即使这是最好的解决方案。有什么想法吗？

Answer 1

改编自 this answer 的解决方案。插入逗号时自动分隔输入(分隔符可以调整)。创建一个 ImageSpan 和一个 ClickableSpan(可以通过单击右侧部分来删除条目)。

public class TagEditText extends EditText {

    TextWatcher textWatcher;

    String lastString;

    String separator = ",";

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


    private void init() {
        setMovementMethod(LinkMovementMethod.getInstance());

        textWatcher = new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                String thisString = s.toString();
                if (thisString.length() > 0 && !thisString.equals(lastString)) {
                    format();

                }
            }
        };

        addTextChangedListener(textWatcher);
    }


    private void format() {

        SpannableStringBuilder sb = new SpannableStringBuilder();
        String fullString = getText().toString();

        String[] strings = fullString.split(separator);


        for (int i = 0; i < strings.length; i++) {

            String string = strings[i];
            sb.append(string);

            if (fullString.charAt(fullString.length() - 1) != separator.charAt(0) && i == strings.length - 1) {
                break;
            }

            BitmapDrawable bd = (BitmapDrawable) convertViewToDrawable(createTokenView(string));
            bd.setBounds(0, 0, bd.getIntrinsicWidth(), bd.getIntrinsicHeight());

            int startIdx = sb.length() - (string.length());
            int endIdx = sb.length();

            sb.setSpan(new ImageSpan(bd), startIdx, endIdx, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            MyClickableSpan myClickableSpan = new MyClickableSpan(startIdx, endIdx);
            sb.setSpan(myClickableSpan, Math.max(endIdx-2, startIdx), endIdx, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

            if (i < strings.length - 1) {
                sb.append(separator);
            } else if (fullString.charAt(fullString.length() - 1) == separator.charAt(0)) {
                sb.append(separator);
            }
        }


        lastString = sb.toString();

        setText(sb);
        setSelection(sb.length());

    }

    public View createTokenView(String text) {


        LinearLayout l = new LinearLayout(getContext());
        l.setOrientation(LinearLayout.HORIZONTAL);
        l.setBackgroundResource(R.drawable.bordered_rectangle_rounded_corners);

        TextView tv = new TextView(getContext());
        l.addView(tv);
        tv.setText(text);
        tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 14);

        ImageView im = new ImageView(getContext());
        l.addView(im);
        im.setImageResource(R.drawable.ic_cross_15dp);
        im.setScaleType(ImageView.ScaleType.FIT_CENTER);

        return l;
    }

    public Object convertViewToDrawable(View view) {
        int spec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        view.measure(spec, spec);
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        Bitmap b = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);

        Canvas c = new Canvas(b);

        c.translate(-view.getScrollX(), -view.getScrollY());
        view.draw(c);
        view.setDrawingCacheEnabled(true);
        Bitmap cacheBmp = view.getDrawingCache();
        Bitmap viewBmp = cacheBmp.copy(Bitmap.Config.ARGB_8888, true);
        view.destroyDrawingCache();
        return new BitmapDrawable(getContext().getResources(), viewBmp);
    }

    private class MyClickableSpan extends ClickableSpan{

        int startIdx;
        int endIdx;

        public MyClickableSpan(int startIdx, int endIdx) {
            super();
            this.startIdx = startIdx;
            this.endIdx = endIdx;
        }

        @Override
        public void onClick(View widget) {



            String s = getText().toString();

            String s1 = s.substring(0, startIdx);
            String s2 = s.substring(Math.min(endIdx+1, s.length()-1), s.length() );

            TagEditText.this.setText(s1 + s2);
        }

    }
}

R.drawable.bordered_rectangle_rounded_corners:

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid
        android:color="@color/transparent"/>
    <stroke android:width="1dp" android:color="#AAAAAA" />
    <corners
        android:radius="100dp" />
    <padding
        android:left="5dp"
        android:top="5dp"
        android:right="5dp"
        android:bottom="5dp" />
</shape>

最后要添加的是“x 按钮”的 png。到目前为止效果很好，唯一的问题是长按删除键不起作用(如果有人知道如何使它起作用，请随时发表评论)