1

我想改变在android中输入一个字符。如果用户类型space或-它将更改为_

所以我尝试了：

TextWatcher tt = null;

final EditText etUsername = (EditText) findViewById(R.id.etUsername);
   tt = new TextWatcher() {
        public void afterTextChanged(Editable s){
            etUsername.setSelection(s.length());
        }
        public void beforeTextChanged(CharSequence s,int start,int count, int after){}
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            etUsername.removeTextChangedListener(tt);
            etUsername.setText(etUsername.getText().toString().replace(" ", "_"));
            etUsername.setText(etUsername.getText().toString().replace("-", "_"));
            etUsername.addTextChangedListener(tt);
        }
    };
    etUsername.addTextChangedListener(tt);

它“有效”，但如果用户输入速度很快，一些字母将不会出现，我会收到一些警告：

W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
W/IInputConnectionWrapper: requestCursorAnchorInfo on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: commitText on inactive InputConnection
W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
W/IInputConnectionWrapper: requestCursorAnchorInfo on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: commitText on inactive InputConnection
W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
W/IInputConnectionWrapper: requestCursorAnchorInfo on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: commitText on inactive InputConnection
W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
W/IInputConnectionWrapper: requestCursorAnchorInfo on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: commitText on inactive InputConnection
W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
W/IInputConnectionWrapper: requestCursorAnchorInfo on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
W/IInputConnectionWrapper: finishComposingText on inactive InputConnection

有什么想法有什么问题吗？

4

2 回答 2

1

试试这个 Textwatcher

  TextWatcher watch = new TextWatcher(){

    @Override
    public void afterTextChanged(Editable arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
            int arg3) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTextChanged(CharSequence s, int a, int b, int c) {
        // TODO Auto-generated method stub

        output.setText(s);
        if(a == 9){
            Toast.makeText(getApplicationContext(), "Maximum Limit Reached", Toast.LENGTH_SHORT).show();
        }
    }};
于 2017-03-29T08:38:08.690 回答
1

无需在文本更改时一次又一次地删除和添加文本更改侦听器，只需设置一个条件来检查您的可编辑项是否具有“-”或“”，然后只需替换并将其设置为 EditText。

etUsername.addTextChangedListener(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) {
                if (s.length() > 0 && (s.toString().contains("-") || s.toString().contains(" "))) {
                    etUsername.setText(s.toString().replace("-", "_").replace(" ", "_"));
                }
            }

            @Override
            public void afterTextChanged(Editable s) {
                etUsername.setSelection(s.length());
            }
        });
于 2017-03-29T09:56:52.743 回答