//************************************** // Name: Alert Dialog Box in Android // Description:When I started learning how to create an application in Android I came across of idea to add quit button which allows our user to quit the program within our application in this article I will complete the functionality of our application Sum and Product Program in Android. I will added the alert or quit dialog box that will ask the user if the user want to quit or return to our program. The code is very simple and easy to understand I enjoy every moment of it working with this simple application program in Android I hope you will find my work useful too. Add me at Facebook my address is jakerpomperada@gmail.com and jakerpomperada@yahoo.com. My mobile number here in the Philippines is 09173084360. // By: Jake R. Pomperada // // // Inputs:None // // Returns:None // //Assumes:None // //Side Effects:None //************************************** MainActivity.java package com.example.servo.add; import android.view.View; import android.widget.EditText; import android.support.v7.app.ActionBarActivity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.content.Context; public class MainActivity extends ActionBarActivity { final Context context = this; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void quit(View arg0) { AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder( context); alertDialogBuilder.setTitle("Quit Program?"); alertDialogBuilder .setMessage("You want to quit program?") .setCancelable(false) .setPositiveButton("Yes", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { MainActivity.this.finish(); } }) .setNegativeButton("No", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alertDialog = alertDialogBuilder.create(); alertDialog.show(); } public void sum_and_product(View view) { EditText editText2 = (EditText) findViewById(R.id.editText2); EditText editText3 = (EditText) findViewById(R.id.editText3); EditText editText4 = (EditText) findViewById(R.id.editText4); EditText editText = (EditText) findViewById(R.id.editText); int first = Integer.valueOf(editText2.getText().toString()); int second = Integer.valueOf(editText4.getText().toString()); int add = first + second; int product = first * second; editText3.setText(Integer.toString(add)); editText.setText(Integer.toString(product)); } public void clear(View view) { EditText editText2 = (EditText) findViewById(R.id.editText2); EditText editText3 = (EditText) findViewById(R.id.editText3); EditText editText4 = (EditText) findViewById(R.id.editText4); EditText editText = (EditText) findViewById(R.id.editText); editText2.setText(""); editText2.requestFocus(); editText2.setText(""); editText3.setText(""); editText4.setText(""); editText.setText(""); } } activity_main.xml <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" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:id="@+id/myRelativeLayout" android:background="#ff1dffb7"> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editText2" android:width="100dp" android:textSize="25dp" android:textStyle="bold" android:inputType="number" android:layout_above="@+id/textView2" android:layout_alignLeft="@+id/editText4" android:layout_alignStart="@+id/editText4" android:textColor="#ff0918ff" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editText3" android:inputType="number" android:width="100dp" android:textSize="25dp" android:textStyle="bold" android:clickable="false" android:cursorVisible="false" android:focusable="false" android:focusableInTouchMode="false" android:layout_alignBottom="@+id/textView3" android:layout_alignLeft="@+id/editText" android:layout_alignStart="@+id/editText" android:textColor="#ff142eff" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editText4" android:width="100dp" android:textSize="25dp" android:textStyle="bold" android:inputType="number" android:textColor="#ff1024ff" android:layout_below="@+id/textView" android:layout_alignRight="@+id/button2" android:layout_alignEnd="@+id/button2" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Ok" android:id="@+id/button" android:onClick="sum_and_product" android:textStyle="bold" android:layout_alignTop="@+id/button2" android:layout_alignRight="@+id/textView3" android:layout_alignEnd="@+id/textView3" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Clear" android:id="@+id/button2" android:onClick="clear" android:textStyle="bold" android:layout_below="@+id/editText" android:layout_alignRight="@+id/textView5" android:layout_alignEnd="@+id/textView5" android:layout_marginTop="37dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="First Number" android:id="@+id/textView" android:textStyle="bold" android:layout_marginTop="50dp" android:layout_below="@+id/textView5" android:layout_alignLeft="@+id/textView4" android:layout_alignStart="@+id/textView4" android:textColor="#ff0e16ff" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Second Number" android:textStyle="bold" android:id="@+id/textView2" android:layout_below="@+id/textView" android:layout_alignLeft="@+id/textView" android:layout_alignStart="@+id/textView" android:layout_marginTop="42dp" android:textColor="#ff1121ff" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="The product is" android:textStyle="bold" android:id="@+id/textView6" android:layout_marginTop="34dp" android:textColor="#ff0a1eff" android:layout_below="@+id/textView3" android:layout_alignLeft="@+id/textView3" android:layout_alignStart="@+id/textView3" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="The total sum is" android:textStyle="bold" android:id="@+id/textView3" android:layout_centerVertical="true" android:layout_alignLeft="@+id/textView2" android:layout_alignStart="@+id/textView2" android:textColor="#ff1624ff" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Sum and Product of Two Numbers" android:textStyle="bold" android:textSize="18dp" android:textColor="#ff0d19ff" android:id="@+id/textView4" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:shadowColor="#ffac0dff" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Created By: Mr. Jake R. Pomperada" android:textSize="16dp" android:textColor="#ff0c26ff" android:textStyle="bold" android:id="@+id/textView5" android:layout_marginTop="38dp" android:layout_below="@+id/textView4" android:layout_centerHorizontal="true" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editText" android:inputType="number" android:width="100dp" android:textSize="25dp" android:textStyle="bold" android:clickable="false" android:cursorVisible="false" android:focusable="false" android:focusableInTouchMode="false" android:layout_alignBottom="@+id/textView6" android:layout_alignRight="@+id/button2" android:layout_alignEnd="@+id/button2" android:textColor="#ff0f27ff" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Quit" android:id="@+id/button3" android:onClick="quit" android:layout_marginTop="20dp" android:textStyle="bold" android:layout_below="@+id/button" android:layout_toRightOf="@+id/button" android:layout_toEndOf="@+id/button" /> </RelativeLayout> strings.xml <resources> <string name="app_name">Sum and Products</string> <string name="action_settings">Settings</string> </resources> AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.servo.add" > <application android:allowBackup="true" android:title="Sum and Product of Two Numbers" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>