Android EditText - Delete the last letter with a button

Issue

I have to buttons that writes A and B to an edittext. If there is something in the edittext how can I delete the last letters with the "Del" button? My layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<Button
    android:id="@+id/buttonb"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/buttona"
    android:text="@string/buttonb"
    android:textSize="50sp"
    android:textStyle="bold" />

<Button
    android:id="@+id/buttona"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_alignParentLeft="true"
    android:layout_centerVertical="true"
    android:text="@string/buttona"
    android:textSize="50sp"
    android:textStyle="bold" />

<Button
    android:id="@+id/buttondel"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:text="@string/buttondel"
    android:textSize="50sp"
    android:textStyle="bold" />

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:ems="58"
    android:textSize="20sp"
    android:textStyle="bold"
    android:inputType="text" >

    <requestFocus />
</EditText>

</RelativeLayout>

And my java:

package com.koostamas.keyboard;

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

public class MainActivity extends Activity implements OnClickListener {

Button buttona, buttonb;
EditText editText;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = (EditText) findViewById(R.id.editText);

addListenerOnButton();
}


   public void addListenerOnButton() {

buttona = (Button) findViewById(R.id.buttona);
buttona.setOnClickListener(this);
buttona.getText();
buttonb = (Button) findViewById(R.id.buttonb);
buttonb.setOnClickListener(this);
buttonb.getText();

   }

public void onClick(View v) {

    Button buttona = (Button)v;
    editText.setText(editText.getText().toString()+buttona.getText().toString());


}

public void onClick1(View v) {

    Button buttonb = (Button)v;
    editText.setText(editText.getText().toString()+buttonb.getText().toString());


}
}

So I want to make it. Please help me! Thanks in advance.

Solution

Yes you can create an onClickListener and just get the text from edit text and delete the last character.

Button delete = (Button) findViewById(R.id.buttondel);
if( delete != null ) {
   delete.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick() {
         String textString = editText.getText().toString();
         if( textString.length() > 0 ) {
            editText.setText(textString.substring(0, textString.length() - 1 ));
            editText.setSelection(editText.getText().length());//position cursor at the end of the line
         }
      }
   });
}

Edit: Also don't forget to check the string length is greater than 0 before doing this in the event a or b hasn't been pressed when the user hits delete.

Answered By - Ben