Creating an Alert Dialog Box in Android

Hey guys how are you? Today I will show you how to make an alert dialog box in Android. In this tutorial I am using the class reference here Android.Builder. Let's start.

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AndroidManifest.xml File

This is your AndroidManifest File; replace it with your own:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.alertdialog"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.alertdialog.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>

Main.xml(Layout File)

This is your layout file:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <EditText
        android:id="@+id/EditText01"
        android:text="I Love Android"
    android:layout_height="50dip"
    android:layout_width="180dip">

    </EditText>

    <Button
    android:id="@+id/Button01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/EditText01"
    android:text="Clear Screen">

    </Button>




</RelativeLayout>

MainActivity.java File

This is your main Java file in which you will code it:

package com.example.alertdialog;

package com.example.alertdialog;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.os.Build;

public class MainActivity extends ActionBarActivity
{
       Button Clear;
       EditText edit_data;
       //Called when the activity is first created
       @Override
       public void onCreate(Bundle savedInstanceState)
       {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.main);

             Clear=(Button)findViewById(R.id.Button01);
             edit_data=(EditText)findViewById(R.id.EditText01);

             Clear.setOnClickListener(new View.OnClickListener()
             {

                   @Override
                   public void onClick(View v)
                   {

                        AlertDialog.Builder builder=new AlertDialog.Builder(v.getContext());
                        //Set a title
                        builder.setTitle("Confirm");
                        //Set a message
                        builder.setMessage("Do you want to Clear?");
                        ////Here Set a listener to be called when the positive button of the dialog is pressed.
                        builder.setPositiveButton("OK",new DialogInterface.OnClickListener()
                        {

                              @Override
                               public void onClick(DialogInterface dialog, int which)
                              {

                                    //clearing the contents of edittext on click of OK button
                                    edit_data.setText("");
                                    //Displaying a toast message
                                    Toast.makeText(getApplicationContext(), "Your text has been cleared", Toast.LENGTH_LONG).show();
                              }

                         });
                        //Here Set a listener to be called when the negative button of the dialog is pressed.
                         builder.setNegativeButton("Cancel",new DialogInterface.OnClickListener()
                         {

                              @Override
                              public void onClick(DialogInterface dialog, int which)
                              {
                                     // TODO Auto-generated method stub
                                     dialog.cancel();
                              }
                         });

                         //Create the dialog
                         AlertDialog alertdialog=builder.create();

                         //show the alertdialog
                         alertdialog.show();

                   }
             });
       }

}

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