Android EditText 粘贴文本时如何禁用自动插入空格？

Question

有时，在 EditText 中粘贴文本时，会自动插入空格/空格。例如，如果将文本粘贴到文本字段中已包含的文本的中间或末尾，就会发生这种情况。有没有办法告诉 Edi​​tText 对象或 ClipboardManager 不应自动插入前导和尾随空格？

Answer 1

使用修剪（）；它将删除字符串前后的空格

str = str.trim();

Answer 2

这是一个 Android 错误。 Check this issue report.

它在 5 中修复。

Answer 3

在使用 InputFilter 之前需要防止“空格”，所以我使用它：

    mSearchText.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View view, int i, KeyEvent keyEvent) {
            MyLog.d(this, keyEvent);
            if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_SPACE) {
                switch (keyEvent.getAction()) {
                    case KeyEvent.ACTION_DOWN:
                        mSpacePressed = true;
                        break;
                    case KeyEvent.ACTION_UP:
                        mSpacePressed = false;
                }
            }
            return false;
        }
    });

    InputFilter mSearchFilter = new InputFilter() {
        @Override
        public CharSequence filter(CharSequence arg0, int arg1, int arg2, Spanned arg3, int arg4, int arg5)
        {
            //Prevent adding spaces on Paste
            //Remember: if you want paste " " it will be prevented
            if (arg0.toString().equals(" ")){
                if (!mSpacePressed){
                    return "";
                }
            }

            //do work with filter

            return null;
        }
    };
    mSearchText.setFilters(new InputFilter[]{mSearchFilter});

Answer 4

我迟到了，但在我的旧平板电脑上，我的 EditText 也可以像你说的那样工作。

所以，我像下面这样修复它。

1.创建一个类来存储起始索引和插入字符串的长度信息。

public class PasteUnit {
    int start = 0;
    int length = 0;

    public PasteUnit(int start, int length) {
        this.start = start;
        this.length = length;
    }
}

2.创建一个扩展EditText的类。

public class MyEditText extends EditText
{
    boolean pasteStarted = false;
    ArrayList<PasteUnit> pasteUnits = new ArrayList<>();

    public MyEditText(Context context)
    {
        super(context);
    }

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

    public MyEditText(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean onTextContextMenuItem(int id) {
        if(id==android.R.id.paste) {//This is called when the paste is triggered
            pasteStarted = true;
        }

        boolean consumed = super.onTextContextMenuItem(id);
        //the super.onTextContextMenuItem(id) processes the pasted string.
        //This is where EditText acts weird.
        //And we can watch what is happening in our TextWatcher to be added below

        switch (id){
            case android.R.id.paste://This is called after we collected all the information

                if(pasteUnits.size()>1) {//When a space or spaces are inserted
                    int startIndex = pasteUnits.get(0).start;
                    int totalLength = 0;
                    for(int i=0;i<pasteUnits.size();i++) {
                        PasteUnit pasteUnit = pasteUnits.get(i);
                        totalLength = totalLength + pasteUnit.length;
                    }
                    int endIndex = startIndex + totalLength;

                    String string = this.getText().toString();
                    String before = string.substring(0, startIndex);
                    String after = string.substring(endIndex);

                    PasteUnit lastPasteUnit = pasteUnits.get(pasteUnits.size()-1);
                    String lastString = string.substring(lastPasteUnit.start, lastPasteUnit.start + lastPasteUnit.length);

                    String result = before + lastString + after;
                    this.setText(result);
                    this.setSelection(startIndex + lastString.length());
                }
                pasteUnits.clear();
                pasteStarted = false;
                break;
            case android.R.id.copy:
                break;
            case android.R.id.cut:
                break;
        }
        return consumed;
    }
}

3.将 TextWatcher 添加到您的 EditText。

看到 TextWatcher，旧的 EditText 的行为真的很奇怪。当您将字符串 A 粘贴到字符串 B 中时，它首先在字符串 B 中插入一个空格，然后在字符串 B 中插入另一个空格，最后在两个空格之间插入字符串 A。

在其他情况下，例如在字符串 B 之后粘贴字符串 A，它首先在字符串 B 之后附加一个空格，然后再附加字符串 A。

所以无论如何它似乎在最后一步插入原始字符串。

   MyEditText edit = (MyEditText) findViewById(R.id.mainEditText1);

   edit.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {
            }

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

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

                if(edit.pasteStarted) {//when it is processing what we pasted
                    edit.pasteUnits.add(new PasteUnit(start, count));
                   //store the information about the inserted spaces and the original pasted string
                }
            }
        });