Sometimes we have to put constant non-editable text in EditText in Android. For example, when we have to take phone number as input we can put fix country code as a prefix. In the case of website address as input, we can put “https://” as hardcoded string at the start. For this purpose, you can use the following method in Java.
public static void AddConstantTextInEditText(EditText edt, String text) {
edt.setText(text);
Selection.setSelection(edt.getText(), edt.getText().length());
edt.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void afterTextChanged(Editable s) {
if(!s.toString().startsWith(text)){
edt.setText(text);
Selection.setSelection(edt.getText(), edt.getText().length());
}
}
});
}
You can just pass your EditText object and a String to this method as shown in the following code.
EditText etWebsite = findViewById(R.id.et_website); AddConstantTextInEditText(etWebsite, "https://");
How it Works?
This method adds a TextChangedListener to the EditText and if the prefix text is removed it automatically adds it again.
That’s it 🙂
For other helping material, have a look at our Tutorials List.
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