Java android

[amandricel]

Hello,
I have a problem with a small project.I need to create a a programm that has a field for a user to enter a text and a button that when pressed ,the first and last letter ef each word has to remain the same,and the other ones changer randomly.
Somethin like this:
before:The car is very fast for this road.
after:The car is vrey fast for tihs raod.
This is what i've done so far(the fisrt and the last letter of the sentence remain the same and the all the other ones change randomly)


package alex.com;
import java.util.ArrayList;
import java.util.Collections;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class MixWords extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText TextEdit = (EditText) findViewById(R.id.TextEdit);
final TextView mix =(TextView) findViewById(R.id.mix);
final Button button = (Button) findViewById(R.id.proces);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {


// Perform action when clicking
MixMe(TextEdit.getText().toString());

}

private void MixMe(String word) {
// TODO Auto-generated method stub
ArrayList<Character> all = new ArrayList<Character>();


for (int i = 1; i < TextEdit.length()-1; i++) {//starts from the second character
all.add(word.charAt(i));
}
Collections.shuffle(all);

char a = word.charAt(0);//The first char

char b = word.charAt(TextEdit.length()-1);//The last char

String result = "";
result+=a;


for (Character character : all) {
result += character;
}
result+=b;


mix.setText(result);//shows the the mix string


}
});
}
}