Insert Android EditText

Question

How to insert characters in the middle of an EditText field?
I am making a calculator that can take a string expression like "3 * (10 ^ 2-8)". I use the EditText field to make a string using XML as follows:

Edittext

android:id="@+id/entry" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/label" android:text="@string/testString1" android:background="@android:drawable/editbox_background" 

and then in my work I will say:

 entry = (EditText)findViewById(R.id.entry); entry.setText("blablahblah"); entry.setSelection(3); 

Now I have an EditText field when the cursor blinks after the third character in the line. How to insert a character there, so he correctly says "blahblahblah"?

Answer 1

The getText () method of the EditText widget returns an object that implements the editable interface. On this object, you can call the insert () method to insert text at a specific position.

I found this by reading the documentation, but never used it myself. But for your needs, to insert a character at a selected position in EditText, the following should work:

 Editable text = entry.getText(); text.insert(entry.getSelectionStart(), "h"); 

Answer 2

Say you have String str and it contains "blablahblah" and you want to do this "blahblahblah", you can do the following:

 String newString = str.substring(0, 3) + "h" + str.substring(3); 

Take the first 3, add a new letter, put everything else. That way, you can take a line from EditText, change it like that, and then put the new String in the new EditText value.