Put constant text inside EditText which should be non-editable - Android

I want to have constant text inside editText like:

http://<here_user_can_write>

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

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.

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?

Solution 1:

Did u try this method?

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());

            }

        }
    });

Solution 2:

As of version 1.2.0-alpha01 of material design library, prefix and suffix is supported for text fields:

<com.google.android.material.textfield.TextInputLayout
        app:prefixText="Price: "
        app:prefixTextAppearance="..."
        app:prefixTextColor="..."
        app:suffixText="Dollar"
        app:suffixTextColor="..."
        app:suffixTextAppearance="...">

    <com.google.android.material.textfield.TextInputEditText .../>

</com.google.android.material.textfield.TextInputLayout>

The only downside in my opinion is that the suffix is fixed at the end of the text field and there is no option to make it flow with the input text. You can vote on this issue for that.