What Is The Best Way To Delete The Last Digit In A Calculator App

package com.gamesup.braingame; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; publ

Solution 1:

You can remove the last character in a string by using the substring method.

In the method where the delete press is being captured:

Strings= display.getText().toString();
s = s.substring(0, s.length() - 1);
display.setText(s);

This will replace the string s with the last character removed

The full code to do this would be:

package com.gamesup.braingame;

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

publicclassEasyextendsActivity {

    EditText display;
    @OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.easy);
        display = (EditText)findViewById(R.id.displayText);
        display.setText("?");

    }

    staticbooleanisEmpty=true;

    publicvoidnum_Clicked(View v){
        Buttonbtn= (Button) v;

        if (v.getId()== R.id.del_button){
            Strings= display.getText().toString();
            s = s.substring(0, s.length() - 1);
            display.setText(s);
            return;
        }

        if(isEmpty){
            display.setText(btn.getText());
            isEmpty = false;
        }
        else{
            display.append(btn.getText().toString()); 
        }
    }
}