Android: Insert text into EditText at current posi

问题:

I want to insert a constant string into an EditText by the press of a button. The string should be inserted at the current position in the EditText. If I use EditText.append the text gets inserted at the end of the EditText.

How can I do that? I couldn't find a suitable method.

回答1:

Try using EditText.getSelectionStart() to get the current position of the cursor. Then you can use String.subString to get the text before and after the cursor and insert your text in the middle.

回答2:

Cpt.Ohlund gave me the right hint. I solved it, now, partly with using EditText.getSelectionStart(), but I realized that you can also replace the selected text with the same expression and you don't need String.subString() for that.

int start = Math.max(myEditText.getSelectionStart(), 0);
int end = Math.max(myEditText.getSelectionEnd(), 0);
myEditText.getText().replace(Math.min(start, end), Math.max(start, end),
        textToInsert, 0, textToInsert.length());

This works for both, inserting a text at the current position and replacing whatever text is selected by the user. The Math.max() is necessary in the first and second line because, if there is no selection or cursor in the EditText, getSelectionStart() and getSelectionEnd() will both return -1. The Math.min() and Math.max() in the third line is necessary because the user could have selected the text backwards and thus start would have a higher value than end which is not allowed for Editable.replace().

回答3:

This seems simpler:

yourEditText.getText().insert(yourEditText.getSelectionStart(), "fizzbuzz");

However, Manuel's answer might be better if you want to replace any selected text with the inserted text.

回答4:

I think this function will help for you :

public void insertConstantStr(String insertStr) {
    String oriContent = editText.getText().toString();
    int index = editText.getSelectionStart() >= 0 ? editText.getSelectionStart() : 0;
    StringBuilder sBuilder = new StringBuilder(oriContent);
    sBuilder.insert(index, insertStr);
    editText.setText(sBuilder.toString());
    editText.setSelection(index + insertStr.length());
}