Creating an Alert Dialog Box in Android

Ehtesham Mehmood
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Introduction

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.

Figure 1

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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();
}
});
}
}