将常量文本放在EditText中，这应该是不可编辑的——Android

I want to have constant text inside editText like:

我想在editText中有常量文本，比如:

http://<here_user_can_write>

User should not be able to delete any chars from "http://", I searched about this and found this:

用户不应该删除任何来自“http://”的字符，我搜索了这个发现:

editText.setFilters(new InputFilter[] {
    new InputFilter() {
        public CharSequence filter(CharSequence src, int start,
            int end, Spanned dst, int dstart, int dend) {
            return src.length() < 1 ? dst.subSequence(dstart, dend) : "";
        }
    }
});

but I don't know whether it restricts user to not delete any chars from start to end limit. I also could not understand use of Spanned class.

但是我不知道它是否限制用户从开始到结束不删除任何字符。我也不明白跨度类的用法。

One way would be a good choice if we can put a TextView inside EditText but I don't think it is possible in Android since both are Views, is it possible?

一种方法是在EditText中放置一个TextView但我认为这在Android中是不可能的，因为两者都是视图，可能吗?

10 个解决方案

#1

Did u try this method?

你试过这种方法吗?

final EditText edt = (EditText) findViewById(R.id.editText1);

edt.setText("http://");
Selection.setSelection(edt.getText(), edt.getText().length());


edt.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable s) {
            if(!s.toString().startsWith("http://")){
                edt.setText("http://");
                Selection.setSelection(edt.getText(), edt.getText().length());

            }

        }
    });

10 个解决方案

#1

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