Android EditText中插入话题模块的删除处理方法

在 EditText 中添加话题 或者是 @某人 时

看起来挺简单，实际操作会有很多坑爹的问题

private String mTopic；

//光标保持在话题的末尾

mInputEdit.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        int selectonStart = ((EditText) v).getSelectionStart();
        int lastPos = 0;
        if (!TextUtils.isEmpty(mCommentName)){
            if ((lastPos = mInputEdit.getText().toString().indexOf(mCommentName, lastPos)) != -1) {
                if (selectonStart >= lastPos && selectonStart <= (lastPos + mCommentName.length())) {
                    mInputEdit.setSelection(lastPos + mCommentName.length());
                }
            }
        }else {
            if ((lastPos = mInputEdit.getText().toString().indexOf(mTopic, lastPos)) != -1) {
                if (selectonStart >= lastPos && selectonStart <= (lastPos + mTopic.length())) {
                    mInputEdit.setSelection(lastPos + mTopic.length());
                }
            }
        }

    }
});

//删除话题 或者@某人

mInputEdit.setOnKeyListener(new View.OnKeyListener() {
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_DEL && event.getAction() == KeyEvent.ACTION_DOWN) {
            //当为删除键并且是按下动作时执行
            int selectionStart = mInputEdit.getSelectionStart();
            int lastPos = 0;
            if (!TextUtils.isEmpty(mCommentName)){
                if ((lastPos = mInputEdit.getText().toString().indexOf(mCommentName, lastPos)) != -1) {
                    if (selectionStart != 0 && selectionStart >= lastPos && selectionStart <= (lastPos + mCommentName.length())) {
                        String sss = mInputEdit.getText().toString();
                        mInputEdit.setText(sss.substring(0, lastPos) + sss.substring(lastPos + mCommentName.length()));
                        mInputEdit.setSelection(lastPos);
                        return true;
                    } else {
                        lastPos += mCommentName.length();
                    }
                }
            } else {
                if ((lastPos = mInputEdit.getText().toString().indexOf(mTopic, lastPos)) != -1) {
                    if (selectionStart != 0 && selectionStart >= lastPos && selectionStart <= (lastPos + mTopic.length())) {
                        String sss = mInputEdit.getText().toString();
                        mInputEdit.setText(sss.substring(0, lastPos) + sss.substring(lastPos + mTopic.length()));
                        list.remove(0);
                        mTopic = "";
                        mSelectTopic.setText("");
                        mInputEdit.setSelection(lastPos);
                        return true;
                    } else {
                        lastPos += mTopic.length();
                    }
                }
            }
        }
        return false;
    }
});