SplashScreen: use Androidx library.

Improvement for Android 12+.
Fixes #1365.

src/main/java/de/dennisguse/opentracks/TrackListActivity.java

@@ -38,6 +38,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.SearchView;
 import androidx.core.content.ContextCompat;
+import androidx.core.splashscreen.SplashScreen;
 import androidx.cursoradapter.widget.ResourceCursorAdapter;
 import androidx.loader.app.LoaderManager;
 import androidx.loader.content.CursorLoader;
@@ -158,8 +159,7 @@ public class TrackListActivity extends AbstractTrackDeleteActivity implements Co
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        // Reset theme after splash
-        setTheme(R.style.ThemeCustom);
+        SplashScreen.installSplashScreen(this);
 
         super.onCreate(savedInstanceState);
         setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);

src/main/java/de/dennisguse/opentracks/publicapi/AbstractAPIActivity.java

@@ -6,6 +6,7 @@ import android.widget.Toast;
 
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.splashscreen.SplashScreen;
 
 import de.dennisguse.opentracks.R;
 import de.dennisguse.opentracks.services.TrackRecordingService;
@@ -30,7 +31,10 @@ public abstract class AbstractAPIActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
+        SplashScreen splashScreen = SplashScreen.installSplashScreen(this);
         super.onCreate(savedInstanceState);
+        splashScreen.setKeepOnScreenCondition(() -> true );
+
         if (PreferencesUtils.isPublicAPIenabled()) {
             Log.i(TAG, "Received and trying to execute requested action.");
             new TrackRecordingServiceConnection(serviceConnectedCallback)

src/main/res/drawable/ic_logo_color_splashscreen.xml

@@ -0,0 +1,33 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="100"
+    android:viewportHeight="100">
+
+    <group
+        android:name="rotationGroup"
+        android:pivotX="50"
+        android:pivotY="50"
+        android:scaleX="0.6"
+        android:scaleY="0.6"
+        >
+        <path android:pathData="M82.489,12.834C83.196,10.418 82.043,9.556 79.926,10.917L10.087,55.828c-2.117,1.361 -1.795,2.628 0.714,2.815L39.806,60.807c2.51,0.188 5.291,2.267 6.18,4.621l10.282,27.208c0.89,2.354 2.195,2.304 2.902,-0.111z">
+            <aapt:attr name="android:fillColor">
+                <gradient
+                    android:endX="70.0"
+                    android:endY="30.0"
+                    android:startX="7.0"
+                    android:startY="83.0"
+                    android:type="linear">
+                    <item
+                        android:color="#FFFBB22F"
+                        android:offset="0" />
+                    <item
+                        android:color="#FFFF6D00"
+                        android:offset="1" />
+                </gradient>
+            </aapt:attr>
+        </path>
+    </group>
+</vector>

src/main/res/drawable/splashscreen.xml

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:opacity="opaque">
-
-    <item android:drawable="@color/splashscreen_background" />
-
-    <item
-        android:width="300dp"
-        android:height="300dp"
-        android:gravity="center"
-        tools:targetApi="m">
-        <inset
-            android:drawable="@drawable/ic_logo_color_24dp"
-            android:inset="20dp" />
-    </item>
-
-</layer-list>

src/main/res/values/themes_custom.xml

@@ -59,10 +59,11 @@ limitations under the License.
         <item name="indicatorColor">?attr/colorSecondary</item>
     </style>
 
-    <style name="SplashTheme" parent="ThemeCustom">
-        <item name="android:statusBarColor">@color/splashscreen_background</item>
-        <item name="android:navigationBarColor">@color/splashscreen_background</item>
-        <item name="android:windowBackground">@drawable/splashscreen</item>
+    <style name="SplashTheme" parent="Theme.SplashScreen">
+        <item name="windowSplashScreenBackground">@color/splashscreen_background</item>
+
+        <item name="windowSplashScreenAnimatedIcon">@drawable/ic_logo_color_splashscreen</item>
+        <item name="postSplashScreenTheme">@style/ThemeCustom</item>
     </style>
 
     <style name="Widget.OpenTracks.FloatingActionButton" parent="Widget.MaterialComponents.FloatingActionButton">