how to create about dialog box in android studio example

how to create about dialog box in android studio example

In this tutorial, today learn how to create about dialog box in android studio. about box used in android studios like your information and version shows. follow the how to create about dialog box in android studio example.

1.MainActivity.java:

package com.About.BoxDemo;

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

public class MainActivity extends Activity {
Button button1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button1=(Button)findViewById(R.id.button);

       button1.setOnClickListener(new View.OnClickListener(){
            public void onClick(View arg0) {
                AboutBox.Show(MainActivity.this);
            }
        });
    }
}

2.activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>

<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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="MainActivity">

    <Button

        android:id="@+id/button"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="About" />

</RelativeLayout>

create a class AboutBox.java

3.AboutBox.java:

package com.About.BoxDemo;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.content.pm.PackageManager;

import android.text.SpannableString;

import android.text.util.Linkify;

import android.view.InflateException;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

public class AboutBox {

    static String VersionName(Context context) {

        try {

            return context.getPackageManager().getPackageInfo(

                    context.getPackageName(), 0).versionName;

        } catch (PackageManager.NameNotFoundException e) {

            return "Unknown";

        }

    }

    public static void Show(Activity callingActivity) {

        //Use a Spannable to allow for links highlighting

        SpannableString aboutText = new SpannableString("Version " +

                VersionName(callingActivity) + "\n\n" +

                callingActivity.getString(R.string.about));

        // views to pass to AlertDialog.Builder and to set the text

        View about;

        TextView tvAbout;

        try {

            //Inflate the custom view

            LayoutInflater inflater = callingActivity.getLayoutInflater();

            about = inflater.inflate(R.layout.aboutbox,

                    (ViewGroup) callingActivity.findViewById(R.id.aboutView));

            tvAbout = (TextView) about.findViewById(R.id.aboutText);

        } catch (InflateException e) {

            // Unchecked exception, unlikely, but default to TextView if it occurs

            about = tvAbout = new TextView(callingActivity);

        }

//Set the about text

        tvAbout.setText(aboutText);

// Now Linkify the text

        Linkify.addLinks(tvAbout, Linkify.ALL);

//Build and show the dialog

        new AlertDialog.Builder(callingActivity)

                .setTitle("About " + callingActivity.getString(R.string.app_name))

                .setCancelable(true)

                .setIcon(R.drawable.ic_launcher)

                .setPositiveButton("OK", null)

                .setView(about)

                .show(); //Builder method returns allow for method chaining

    }

}

create a XML for AboutBox  class :

4.aboutbox.xml:

<?xml version="1.0" encoding="utf-8"?>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/aboutView"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

    <LinearLayout android:id="@+id/aboutLayout"

        android:orientation="horizontal"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:padding="5dp">

        <TextView android:id="@+id/aboutText"

            android:layout_width="wrap_content"

            android:layout_height="fill_parent"

            android:textColor="#888"/>

    </LinearLayout>

</ScrollView>

5.dimens.xml:

<resources>

    <!-- Default screen margins, per the Android Design guidelines. -->

    <dimen name="activity_horizontal_margin">16dp</dimen>

    <dimen name="activity_vertical_margin">16dp</dimen>

</resources>

6.strings.xml:

<resources>

    <string name="app_name">AboutBoxDemo</string>

    <string name="about">about</string>

</resources>

7.AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.About.BoxDemo">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Output: