Generic info activity for Android app's. Shows how to get your app's version tag- name from the associated- gradle file. Shows how to check if a new version of this app is available at Google Play Store.

Generic info activity for Android

Asociated library's (include into yout build- gradle)

// jsoup HTML parser library @ https://jsoup.org/
implementation 'org.jsoup:jsoup:1.13.1'


Layout:

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

<androidx.constraintlayout.widget.ConstraintLayout xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:background="#ffffff"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    tools:context=".InfoActivity">

    <TextView
        android:id="@+id/info_new_version_available"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:paddingLeft="16dp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"></TextView>

    <WebView
        android:id="@+id/browser"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginStart="9dp"
        android:layout_marginTop="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="@+id/info_new_version_available"
        app:layout_constraintTop_toBottomOf="@+id/info_new_version_available"></WebView>

    <ProgressBar
        android:id="@+id/html_load_progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/browser"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Strings=> Shows how to implement HTML- Strings into string- resources

 <!-- Info activity -->
    <string name="app_title">Einsatzplan</string>
    <string name="version_text">Version:</string>

    <string name="version_info_update_available">
     <![CDATA[
        Es ist eine neuere Version dieser App im Google Play Store verfügbar. Einsatzplan Version:
        ]]>
    </string>

    <string name="version_info_ok">
     <![CDATA[
        Ihre App ist auf dem neustem Stand.
        ]]>
    </string>
    
    
    Activity source code:
    
    
    package com.berthold.convertjobscheduletocalendar;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.text.HtmlCompat;
import androidx.lifecycle.ViewModelProvider;

import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.webkit.WebView;
import android.widget.ProgressBar;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class InfoActivity extends AppCompatActivity {

    /**
     * Shows app info...
     */
    // Info
    private static String tag;

    // UI
    private MainActivityViewModel mainActivityViewModel;

    // Filesystem
    private BufferedReader bufferedReader;

    // Html
    private StringBuilder htmlSite;
    private TextView updateInfoView;
    private WebView webView;
    private ProgressBar progress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_info);

        // ViewModel
        mainActivityViewModel = new ViewModelProvider(this).get(MainActivityViewModel.class);

        // UI
        final Handler handler = new Handler();
        Context context = getApplicationContext();

        updateInfoView=findViewById(R.id.info_new_version_available);
        webView = (WebView) findViewById(R.id.browser);
        progress = (ProgressBar) findViewById(R.id.html_load_progress);

        // @rem:Get current locale (determine language from Androids settings@@
        //final Locale current=getResources().getConfiguration().locale;
        final String current = getResources().getConfiguration().locale.getLanguage();
        //Log.v("LOCALE", "Country:" + current);

        // Check if there is an update available
        String currentVersion=GetThisAppsVersion.thisVersion(getApplicationContext());
        getSupportActionBar().setSubtitle("Version:"+currentVersion);

        String latestVersionInGooglePlay=mainActivityViewModel.getAppVersionfromGooglePlay(getApplicationContext());

       if (latestVersionInGooglePlay.equals(currentVersion)) {
            //updateInfoView.setText(getResources().getText(R.string.version_info_is_latest_version));
           updateInfoView.setText(HtmlCompat.fromHtml(getResources().getText(R.string.version_info_ok)+"",0));
        } else
           updateInfoView.setText(HtmlCompat.fromHtml(getResources().getText(R.string.version_info_update_available) + latestVersionInGooglePlay,0));

        // Load html...
        progress.setVisibility(View.VISIBLE);

        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    htmlSite = new StringBuilder();

                    // @rem:Shows how to load data from androids 'assests'- folder@@
                    if (current.equals("de") || current.equals("en")) {
                        if (current.equals("de"))
                            bufferedReader = new BufferedReader(new InputStreamReader(getAssets().open("InfoPage-de.html")));
                        if (current.equals("en"))
                            bufferedReader = new BufferedReader(new InputStreamReader(getAssets().open("InfoPage-en.html")));
                    } else
                        bufferedReader = new BufferedReader(new InputStreamReader(getAssets().open("InfoPage-en.html")));

                    String line;
                    while ((line = bufferedReader.readLine()) != null)
                        htmlSite.append(line);

                } catch (IOException io) {
                    Log.v("Info", io.toString());
                }

                // Show
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        progress.setVisibility(View.GONE);
                        webView.loadData(htmlSite.toString(), "text/html", null);
                    }
                });
            }
        });
        t.start();
    }
}