Android Java Dialog Box App Version Name and Version Code

Android Java Dialog Box App Version Name and Version Code

app/src/main/res/layout/activity_main.xml

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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"     android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"     tools:context=".MainActivity">       <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/dialogbox"         android:textSize="24sp" tools:text="Dialog Box" tools:textAlignment="center" />       <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="bottom"         android:orientation="vertical">           <Button android:id="@+id/btnabout" android:layout_width="wrap_content" android:layout_height="wrap_content"             android:layout_gravity="center_horizontal" android:text="@string/aboutapp" />     </LinearLayout> </LinearLayout>

app/src/main/java/com/myappdev/MainActivity.Java

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package com.myappdev;   import androidx.appcompat.app.AppCompatActivity;   import android.app.AlertDialog; import android.content.DialogInterface; import android.content.pm.PackageInfo; import android.content.pm.PackageManager.NameNotFoundException; import android.os.Bundle; import android.view.View; import android.widget.Button;   public class MainActivity extends AppCompatActivity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);           Button buttonAboutMe = (Button)findViewById(R.id.btnabout);           buttonAboutMe.setOnClickListener(new Button.OnClickListener(){               @Override             public void onClick(View v) {                   String strVersion;                   PackageInfo packageInfo;                 try {                     packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);                     strVersion = "Version Name: " + packageInfo.versionName +"\n"                             + "Version Code: " + String.valueOf(packageInfo.versionCode);                 } catch (NameNotFoundException e) {                     e.printStackTrace();                     strVersion = "Cannot load Version!";                 }                   new AlertDialog.Builder(MainActivity.this)                         .setTitle("About The App!").setMessage(strVersion)                         .setPositiveButton("OK",                                 new DialogInterface.OnClickListener() {                                     public void onClick(DialogInterface dialog, int which) {}                                 }).show();             }         });     } }

app/src/main/res/value/strings.xml

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<resources>     <string name="app_name">MyappDev</string>     <string name="app_first_started">App first started</string>     <string name="aboutapp">- About -</string>     <string name="dialogbox">Dialog Box</string> </resources>