Question

I have got an EditText in my Android app where you can type in some text. What I want to do is change every single character to another one (some kind of enciphering). Therefore I first have to read every single character.

How can I do that?

UPDATE:
The text in the edit text is to be encoded on a button click.

Answer 1

You can use InputFilter.

As you go on typing below snippet will replace each character by $.

Following Snippet will help you.

InputFilter filter = new InputFilter() {

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        for (int i = start; i < end; i++) {
            return "$";
         }
        return null;
    }
};

EditText editText = (EditText) findViewById(R.id.rg);
editText.setFilters(new InputFilter[] {filter});

Below is my working snippet

package org.vipul;

import android.app.Activity;
import android.os.Bundle;
import android.text.InputFilter;
import android.text.Spanned;
import android.widget.EditText;

public class AbcActivity extends Activity {
    EditText editText;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        editText = (EditText) findViewById(R.id.rg);

        InputFilter filter = new InputFilter() {

            @Override
            public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
                 for (int i = start; i < end; i++) {
                    return "$";
                 }

                return null;
            }
        };


        editText.setFilters(new InputFilter[] {
            filter
        });

    }
}