Add "About" screen

app/src/main/AndroidManifest.xml

@@ -98,6 +98,14 @@
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".AboutActivity"
+            android:label="@string/about_activity"
+            android:parentActivityName=".MainActivity">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".MainActivity" />
+        </activity>
 
         <receiver
             android:name=".StartupReceiver"

app/src/main/java/dummydomain/yetanothercallblocker/AboutActivity.java

@@ -0,0 +1,163 @@
+package dummydomain.yetanothercallblocker;
+
+import android.content.Intent;
+import android.os.Build;
+import android.os.Bundle;
+import android.text.Html;
+import android.text.Spanned;
+import android.text.format.DateUtils;
+import android.text.method.LinkMovementMethod;
+import android.view.View;
+import android.widget.TextView;
+
+import androidx.annotation.IdRes;
+import androidx.annotation.StringRes;
+import androidx.appcompat.app.AppCompatActivity;
+
+import org.greenrobot.eventbus.Subscribe;
+import org.greenrobot.eventbus.ThreadMode;
+
+import dummydomain.yetanothercallblocker.data.YacbHolder;
+import dummydomain.yetanothercallblocker.event.MainDbDownloadFinishedEvent;
+import dummydomain.yetanothercallblocker.event.SecondaryDbUpdateFinished;
+import dummydomain.yetanothercallblocker.event.SecondaryDbUpdatingEvent;
+import dummydomain.yetanothercallblocker.sia.model.database.CommunityDatabase;
+import dummydomain.yetanothercallblocker.work.TaskService;
+
+public class AboutActivity extends AppCompatActivity {
+
+    private final Settings settings = App.getSettings();
+    private final CommunityDatabase communityDatabase = YacbHolder.getCommunityDatabase();
+
+    private TextView dbInfoTv;
+
+    private boolean checkingForUpdates;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_about);
+
+        setLink(R.id.homepage, R.string.url_repo, R.string.homepage);
+        setLink(R.id.faq, R.string.url_faq, R.string.faq);
+        setLink(R.id.translate, R.string.url_translate, R.string.translate);
+        setLink(R.id.issues, R.string.url_issues, R.string.issues);
+
+        ((TextView) findViewById(R.id.app_version)).setText(
+                getString(R.string.version_string, BuildConfig.VERSION_NAME));
+
+        dbInfoTv = findViewById(R.id.db_info);
+
+        dbInfoTv.setOnLongClickListener(this::onDbInfoLongClicked);
+
+        if (EventUtils.bus().getStickyEvent(SecondaryDbUpdatingEvent.class) != null) {
+            checkingForUpdates = true;
+        }
+
+        updateDbInfo();
+    }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+
+        EventUtils.register(this);
+    }
+
+    @Override
+    protected void onStop() {
+        EventUtils.unregister(this);
+
+        super.onStop();
+    }
+
+    @Subscribe(threadMode = ThreadMode.MAIN_ORDERED)
+    public void onMainDbDownloadFinished(MainDbDownloadFinishedEvent event) {
+        updateDbInfo();
+    }
+
+    @Subscribe(threadMode = ThreadMode.MAIN_ORDERED)
+    public void onSecondaryDbUpdating(SecondaryDbUpdatingEvent event) {
+        checkingForUpdates = true;
+        updateDbInfo();
+    }
+
+    @Subscribe(threadMode = ThreadMode.MAIN_ORDERED)
+    public void onSecondaryDbUpdateFinished(SecondaryDbUpdateFinished event) {
+        checkingForUpdates = false;
+        updateDbInfo();
+    }
+
+    private void updateDbInfo() {
+        // TODO: async?
+
+        boolean clickable;
+
+        String dbVersionValue;
+        if (communityDatabase.isOperational()) {
+            dbVersionValue = String.valueOf(communityDatabase.getEffectiveDbVersion());
+            clickable = true;
+        } else {
+            dbVersionValue = getString(R.string.db_version_not_available);
+            clickable = false;
+        }
+
+        if (clickable && checkingForUpdates) clickable = false;
+
+        setUpdateClickable(clickable);
+
+        String lastCheckValue;
+        if (checkingForUpdates) {
+            lastCheckValue = getString(R.string.db_last_update_check_checking);
+        } else {
+            long lastUpdateCheckTime = settings.getLastUpdateCheckTime();
+            lastCheckValue = lastUpdateCheckTime != 0 ?
+                    DateUtils.getRelativeTimeSpanString(lastUpdateCheckTime).toString()
+                    : getString(R.string.db_last_update_check_never);
+        }
+
+        String dbInfoString = getString(R.string.db_version, dbVersionValue)
+                + "\n" + getString(R.string.db_last_update_check, lastCheckValue);
+
+        dbInfoTv.setText(dbInfoString);
+    }
+
+    private void setUpdateClickable(boolean clickable) {
+        dbInfoTv.setClickable(clickable);
+    }
+
+    public void onUpdateDbClicked(View view) {
+        setUpdateClickable(false);
+
+        TaskService.start(this, TaskService.TASK_UPDATE_SECONDARY_DB);
+    }
+
+    private boolean onDbInfoLongClicked(View view) {
+        startActivity(new Intent(this, DbManagementActivity.class));
+        finish();
+        return true;
+    }
+
+    private void setLink(@IdRes int textView, @StringRes int url, @StringRes int text) {
+        setLink(findViewById(textView), getString(url), getString(text));
+    }
+
+    private void setLink(TextView textView, String url, String text) {
+        textView.setMovementMethod(LinkMovementMethod.getInstance());
+        textView.setText(fromHtml("<a href=\"" + url + "\">" + text + "</a>"));
+    }
+
+    private static Spanned fromHtml(String s) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            return Html.fromHtml(s, Html.FROM_HTML_MODE_LEGACY);
+        } else {
+            return fromHtmlLegacy(s);
+        }
+    }
+
+    @SuppressWarnings({"deprecation", "RedundantSuppression"})
+    private static Spanned fromHtmlLegacy(String s) {
+        return Html.fromHtml(s);
+    }
+
+}

app/src/main/java/dummydomain/yetanothercallblocker/MainActivity.java

@@ -280,6 +280,10 @@ public class MainActivity extends AppCompatActivity {
         startActivity(new Intent(this, SettingsActivity.class));
     }
 
+    public void onOpenAbout(MenuItem item) {
+        startActivity(new Intent(this, AboutActivity.class));
+    }
+
     private void onCallLogItemClicked(CallLogItemGroup item) {
         InfoDialogHelper.showDialog(this, item.getItems().get(0).numberInfo, null);
     }

app/src/main/res/drawable/logo.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape>
+            <solid android:color="#01579B" />
+            <corners android:radius="4dp" />
+        </shape>
+    </item>
+    <item
+        android:bottom="-18dp"
+        android:drawable="@drawable/ic_launcher_foreground"
+        android:left="-18dp"
+        android:right="-18dp"
+        android:top="-18dp" />
+</layer-list>

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

@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".AboutActivity">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        android:padding="@dimen/text_margin">
+
+        <ImageView
+            android:id="@+id/imageView"
+            android:layout_width="150dp"
+            android:layout_height="150dp"
+            android:layout_gravity="center_horizontal"
+            android:contentDescription="@string/logo_description"
+            app:srcCompat="@drawable/logo" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal"
+            android:layout_marginTop="26dp"
+            android:text="@string/app_name"
+            android:textAppearance="?android:attr/textAppearanceLarge" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal"
+            android:layout_marginTop="8dp"
+            android:text="@string/motto" />
+
+        <Space
+            android:layout_width="match_parent"
+            android:layout_height="50dp" />
+
+        <TextView
+            android:id="@+id/homepage"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            tools:text="@string/homepage" />
+
+        <TextView
+            android:id="@+id/faq"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            tools:text="@string/faq" />
+
+        <TextView
+            android:id="@+id/translate"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            tools:text="@string/translate" />
+
+        <TextView
+            android:id="@+id/issues"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            tools:text="@string/issues" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/license" />
+
+        <Space
+            android:layout_width="match_parent"
+            android:layout_height="50dp" />
+
+        <TextView
+            android:id="@+id/app_version"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal"
+            tools:text="v0.5.8" />
+
+        <TextView
+            android:id="@+id/db_info"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal"
+            android:gravity="center_horizontal"
+            android:longClickable="true"
+            android:onClick="onUpdateDbClicked"
+            tools:text="Database version: 1800\nLast update check: 1 minute ago" />
+
+    </LinearLayout>
+
+</ScrollView>

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

@@ -41,4 +41,8 @@
         android:onClick="onOpenSettings"
         android:title="@string/open_settings_activity" />
 
+    <item
+        android:onClick="onOpenAbout"
+        android:title="@string/open_about_activity" />
+
 </menu>

app/src/main/res/values-ru/strings.xml

@@ -184,4 +184,21 @@
     <string name="duration_h_m_s">%1$dч %2$dм %3$dс</string>
     <string name="duration_m_s">%1$dм %2$dс</string>
     <string name="duration_s">%dс</string>
+
+    <string name="open_about_activity">О приложении</string>
+    <string name="about_activity">О приложении</string>
+    <string name="version_string">v%s</string>
+    <string name="db_version">Версия базы: %s</string>
+    <string name="db_version_not_available">Н/Д</string>
+    <string name="db_last_update_check">Последняя проверка: %s</string>
+    <string name="db_last_update_check_never">никогда</string>
+    <string name="db_last_update_check_checking">проверяем…</string>
+
+    <string name="motto">Без труда блокируйте нежелательные вызовы</string>
+    <string name="logo_description">Логотип</string>
+    <string name="homepage">Домашняя страница проекта</string>
+    <string name="faq">Часто задаваемые вопросы</string>
+    <string name="translate">Перевести приложение на Weblate</string>
+    <string name="issues">Получить поддержку / сообщить о проблеме</string>
+    <string name="license">Это приложение распространяется под лицензией AGPL-3.0-only.</string>
 </resources>

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

@@ -204,4 +204,25 @@
     <string name="duration_h_m_s">%1$dh %2$dm %3$ds</string>
     <string name="duration_m_s">%1$dm %2$ds</string>
     <string name="duration_s">%ds</string>
+
+    <string name="open_about_activity">About</string>
+    <string name="about_activity">About</string>
+    <string name="version_string">v%s</string>
+    <string name="db_version">Database version: %s</string>
+    <string name="db_version_not_available">n/a</string>
+    <string name="db_last_update_check">Last update check: %s</string>
+    <string name="db_last_update_check_never">never</string>
+    <string name="db_last_update_check_checking">checking…</string>
+
+    <string name="motto">Block unwanted calls effortlessly</string>
+    <string name="logo_description">Logo</string>
+    <string name="homepage">Project homepage</string>
+    <string name="faq">Frequently Asked Questions</string>
+    <string name="translate">Translate the app on Weblate</string>
+    <string name="issues">Get support / report a problem</string>
+    <string name="license">This application is licensed under AGPL-3.0-only.</string>
+    <string name="url_repo" translatable="false">https://gitlab.com/xynngh/YetAnotherCallBlocker</string>
+    <string name="url_faq" translatable="false">https://gitlab.com/xynngh/YetAnotherCallBlocker/-/blob/master/FAQ.md</string>
+    <string name="url_translate" translatable="false">https://hosted.weblate.org/engage/yet-another-call-blocker/</string>
+    <string name="url_issues" translatable="false">https://gitlab.com/xynngh/YetAnotherCallBlocker/-/issues</string>
 </resources>