Actionbar: icon provides back functionality (except in TrackListActivity).

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

@@ -19,6 +19,7 @@ package de.dennisguse.opentracks;
 import android.os.Bundle;
 import android.view.View;
 
+import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 
@@ -39,8 +40,22 @@ public abstract class AbstractActivity extends AppCompatActivity {
         setContentView(getRootView());
 
         Toolbar toolbar = findViewById(R.id.toolbar);
-        setSupportActionBar(toolbar);
+        setupActionBarBack(toolbar);
+    }
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        onBackPressed();
+        return true;
     }
 
     protected abstract View getRootView();
+
+    protected void setupActionBarBack(@Nullable Toolbar toolbar) {
+        setSupportActionBar(toolbar);
+        if (toolbar != null) {
+            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+            getSupportActionBar().setDisplayShowHomeEnabled(true);
+        }
+    }
 }

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

@@ -37,6 +37,7 @@ import android.widget.Toast;
 
 import androidx.annotation.NonNull;
 import androidx.appcompat.widget.SearchView;
+import androidx.appcompat.widget.Toolbar;
 import androidx.core.app.ActivityCompat;
 import androidx.cursoradapter.widget.ResourceCursorAdapter;
 import androidx.loader.app.LoaderManager;
@@ -243,6 +244,12 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
         requestGPSPermissions();
     }
 
+    @Override
+    protected void setupActionBarBack(Toolbar toolbar) {
+        setSupportActionBar(toolbar);
+        toolbar.setNavigationIcon(R.drawable.ic_logo_color_24dp);
+    }
+
     @Override
     protected void onStart() {
         super.onStart();

src/main/java/de/dennisguse/opentracks/settings/SettingsActivity.java

@@ -4,10 +4,10 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.util.Log;
+import android.view.View;
 import android.widget.Toast;
 
 import androidx.appcompat.app.AlertDialog;
-import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.documentfile.provider.DocumentFile;
 import androidx.fragment.app.DialogFragment;
@@ -18,6 +18,7 @@ import androidx.preference.PreferenceFragmentCompat;
 
 import java.util.Locale;
 
+import de.dennisguse.opentracks.AbstractActivity;
 import de.dennisguse.opentracks.R;
 import de.dennisguse.opentracks.fragments.ChooseActivityTypeDialogFragment;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
@@ -31,7 +32,7 @@ import de.dennisguse.opentracks.util.HackUtils;
 import de.dennisguse.opentracks.util.PreferencesUtils;
 import de.dennisguse.opentracks.util.StringUtils;
 
-public class SettingsActivity extends AppCompatActivity implements ChooseActivityTypeDialogFragment.ChooseActivityTypeCaller, ResetDialogPreference.ResetCallback {
+public class SettingsActivity extends AbstractActivity implements ChooseActivityTypeDialogFragment.ChooseActivityTypeCaller, ResetDialogPreference.ResetCallback {
 
     private static final String TAG = SettingsActivity.class.getSimpleName();
     public static final String EXTRAS_CHECK_EXPORT_DIRECTORY = "Check Export Directory";
@@ -43,12 +44,6 @@ public class SettingsActivity extends AppCompatActivity implements ChooseActivit
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        setContentView(R.layout.settings);
-
-        Toolbar toolbar = findViewById(R.id.toolbar);
-        toolbar.setTitle(R.string.menu_settings);
-        setSupportActionBar(toolbar);
-
         Intent intent = getIntent();
         if (intent != null && intent.hasExtra(EXTRAS_CHECK_EXPORT_DIRECTORY)) {
             checkExportDirectory = true;
@@ -56,6 +51,17 @@ public class SettingsActivity extends AppCompatActivity implements ChooseActivit
         onReset();
     }
 
+    @Override
+    protected View getRootView() {
+        return getLayoutInflater().inflate(R.layout.settings, null);
+    }
+
+    @Override
+    protected void setupActionBarBack(Toolbar toolbar) {
+        super.setupActionBarBack(toolbar);
+        toolbar.setTitle(R.string.menu_settings);
+    }
+
     @Override
     protected void onResume() {
         if (checkExportDirectory) {

src/main/res/layout/toolbar.xml

@@ -1,12 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
+<merge xmlns:android="http://schemas.android.com/apk/res/android">
 
     <androidx.appcompat.widget.Toolbar
         android:id="@+id/toolbar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/colorPrimary"
-        android:minHeight="?attr/actionBarSize"
-        app:navigationIcon="@drawable/ic_logo_color_24dp" />
+        android:minHeight="?attr/actionBarSize" />
 </merge>