ui: Codestyle cleanups

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

9 files changed, 62 insertions, 60 deletions

diff --git a/ui/src/main/java/com/wireguard/android/Application.java b/ui/src/main/java/com/wireguard/android/Application.java
index c0c89fcd..62cf25a1 100644
--- a/ui/src/main/java/com/wireguard/android/Application.java
+++ b/ui/src/main/java/com/wireguard/android/Application.java
@@ -79,7 +79,7 @@ public class Application extends android.app.Application implements SharedPrefer
                     try {
                         if (!didStartRootShell)
                             app.rootShell.start();
-                        WgQuickBackend wgQuickBackend = new WgQuickBackend(app.getApplicationContext(), app.rootShell, app.toolsInstaller);
+                        final WgQuickBackend wgQuickBackend = new WgQuickBackend(app.getApplicationContext(), app.rootShell, app.toolsInstaller);
                         wgQuickBackend.setMultipleTunnels(app.sharedPreferences.getBoolean("multiple_tunnels", false));
                         backend = wgQuickBackend;
                     } catch (final Exception ignored) {
diff --git a/ui/src/main/java/com/wireguard/android/activity/MainActivity.java b/ui/src/main/java/com/wireguard/android/activity/MainActivity.java
index d9bbee20..61ae63e3 100644
--- a/ui/src/main/java/com/wireguard/android/activity/MainActivity.java
+++ b/ui/src/main/java/com/wireguard/android/activity/MainActivity.java
@@ -10,7 +10,6 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
-import android.view.View.OnApplyWindowInsetsListener;
 import android.widget.LinearLayout;
 
 import com.wireguard.android.R;
@@ -78,7 +77,7 @@ public class MainActivity extends BaseActivity
         onBackStackChanged();
         // Dispatch insets on back stack change
         // This is required to ensure replaced fragments are also able to consume insets
-        findViewById(R.id.master_detail_wrapper).setOnApplyWindowInsetsListener((OnApplyWindowInsetsListener) (v, insets) -> {
+        findViewById(R.id.master_detail_wrapper).setOnApplyWindowInsetsListener((v, insets) -> {
             final FragmentManager fragmentManager = getSupportFragmentManager();
             fragmentManager.addOnBackStackChangedListener(() -> {
                 final List<Fragment> fragments = fragmentManager.getFragments();
@@ -97,6 +96,7 @@ public class MainActivity extends BaseActivity
     }
 
     @Override
+    @SuppressWarnings("UnnecessaryFullyQualifiedName")
     public boolean onOptionsItemSelected(final MenuItem item) {
         switch (item.getItemId()) {
             case android.R.id.home:
diff --git a/ui/src/main/java/com/wireguard/android/activity/SettingsActivity.java b/ui/src/main/java/com/wireguard/android/activity/SettingsActivity.java
index 5d8e91f9..a0726d55 100644
--- a/ui/src/main/java/com/wireguard/android/activity/SettingsActivity.java
+++ b/ui/src/main/java/com/wireguard/android/activity/SettingsActivity.java
@@ -67,14 +67,13 @@ public class SettingsActivity extends ThemeChangeAwareActivity {
     }
 
     @Override
+    @SuppressWarnings("UnnecessaryFullyQualifiedName")
     public boolean onOptionsItemSelected(final MenuItem item) {
-        switch (item.getItemId()) {
-            case android.R.id.home:
-                finish();
-                return true;
-            default:
-                return super.onOptionsItemSelected(item);
+        if (item.getItemId() == android.R.id.home) {
+            finish();
+            return true;
         }
+        return super.onOptionsItemSelected(item);
     }
 
     @Override
@@ -100,7 +99,7 @@ public class SettingsActivity extends ThemeChangeAwareActivity {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
                 screen.removePreference(getPreferenceManager().findPreference("dark_theme"));
 
-            final Preference wgQuickOnlyPrefs[] = {
+            final Preference[] wgQuickOnlyPrefs = {
                     getPreferenceManager().findPreference("tools_installer"),
                     getPreferenceManager().findPreference("restore_on_boot"),
                     getPreferenceManager().findPreference("multiple_tunnels")
diff --git a/ui/src/main/java/com/wireguard/android/fragment/TunnelDetailFragment.java b/ui/src/main/java/com/wireguard/android/fragment/TunnelDetailFragment.java
index e6ac7092..eb76a220 100644
--- a/ui/src/main/java/com/wireguard/android/fragment/TunnelDetailFragment.java
+++ b/ui/src/main/java/com/wireguard/android/fragment/TunnelDetailFragment.java
@@ -37,6 +37,7 @@ public class TunnelDetailFragment extends BaseFragment {
     @Nullable private State lastState = State.TOGGLE;
     @Nullable private Timer timer;
 
+    @SuppressWarnings("MagicNumber")
     private String formatBytes(final long bytes) {
         if (bytes < 1024)
             return requireContext().getString(R.string.transfer_bytes, bytes);
diff --git a/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.java b/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.java
index 811157cc..cf3ee34b 100644
--- a/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.java
+++ b/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.java
@@ -21,6 +21,7 @@ import android.widget.Toast;
 import com.google.android.material.snackbar.Snackbar;
 import com.wireguard.android.Application;
 import com.wireguard.android.R;
+import com.wireguard.android.backend.Tunnel;
 import com.wireguard.android.databinding.TunnelEditorFragmentBinding;
 import com.wireguard.android.fragment.AppListDialogFragment.AppExclusionListener;
 import com.wireguard.android.model.ObservableTunnel;
@@ -57,8 +58,7 @@ public class TunnelEditorFragment extends BaseFragment implements AppExclusionLi
         }
     }
 
-    private void onConfigSaved(final ObservableTunnel savedTunnel,
-                               @Nullable final Throwable throwable) {
+    private void onConfigSaved(final Tunnel savedTunnel, @Nullable final Throwable throwable) {
         final String message;
         if (throwable == null) {
             message = getString(R.string.config_save_success, savedTunnel.getName());
@@ -118,14 +118,14 @@ public class TunnelEditorFragment extends BaseFragment implements AppExclusionLi
         if (activity == null) return;
         final View focusedView = activity.getCurrentFocus();
         if (focusedView != null) {
-            final Object service = activity.getSystemService(Context.INPUT_METHOD_SERVICE);
-            final InputMethodManager inputManager = (InputMethodManager) service;
+            final InputMethodManager inputManager = (InputMethodManager)
+                    activity.getSystemService(Context.INPUT_METHOD_SERVICE);
             if (inputManager != null)
                 inputManager.hideSoftInputFromWindow(focusedView.getWindowToken(),
                         InputMethodManager.HIDE_NOT_ALWAYS);
         }
         // Tell the activity to finish itself or go back to the detail view.
-        getActivity().runOnUiThread(() -> {
+        requireActivity().runOnUiThread(() -> {
             // TODO(smaeul): Remove this hack when fixing the Config ViewModel
             // The selected tunnel has to actually change, but we have to remember this one.
             final ObservableTunnel savedTunnel = tunnel;
@@ -137,39 +137,37 @@ public class TunnelEditorFragment extends BaseFragment implements AppExclusionLi
 
     @Override
     public boolean onOptionsItemSelected(final MenuItem item) {
-        switch (item.getItemId()) {
-            case R.id.menu_action_save:
-                if (binding == null)
-                    return false;
-                final Config newConfig;
-                try {
-                    newConfig = binding.getConfig().resolve();
-                } catch (final Exception e) {
-                    final String error = ErrorMessages.get(e);
-                    final String tunnelName = tunnel == null ? binding.getName() : tunnel.getName();
-                    final String message = getString(R.string.config_save_error, tunnelName, error);
-                    Log.e(TAG, message, e);
-                    Snackbar.make(binding.mainContainer, error, Snackbar.LENGTH_LONG).show();
-                    return false;
-                }
-                if (tunnel == null) {
-                    Log.d(TAG, "Attempting to create new tunnel " + binding.getName());
-                    final TunnelManager manager = Application.getTunnelManager();
-                    manager.create(binding.getName(), newConfig)
-                            .whenComplete(this::onTunnelCreated);
-                } else if (!tunnel.getName().equals(binding.getName())) {
-                    Log.d(TAG, "Attempting to rename tunnel to " + binding.getName());
-                    tunnel.setName(binding.getName())
-                            .whenComplete((a, b) -> onTunnelRenamed(tunnel, newConfig, b));
-                } else {
-                    Log.d(TAG, "Attempting to save config of " + tunnel.getName());
-                    tunnel.setConfig(newConfig)
-                            .whenComplete((a, b) -> onConfigSaved(tunnel, b));
-                }
-                return true;
-            default:
-                return super.onOptionsItemSelected(item);
+        if (item.getItemId() == R.id.menu_action_save) {
+            if (binding == null)
+                return false;
+            final Config newConfig;
+            try {
+                newConfig = binding.getConfig().resolve();
+            } catch (final Exception e) {
+                final String error = ErrorMessages.get(e);
+                final String tunnelName = tunnel == null ? binding.getName() : tunnel.getName();
+                final String message = getString(R.string.config_save_error, tunnelName, error);
+                Log.e(TAG, message, e);
+                Snackbar.make(binding.mainContainer, error, Snackbar.LENGTH_LONG).show();
+                return false;
+            }
+            if (tunnel == null) {
+                Log.d(TAG, "Attempting to create new tunnel " + binding.getName());
+                final TunnelManager manager = Application.getTunnelManager();
+                manager.create(binding.getName(), newConfig)
+                        .whenComplete(this::onTunnelCreated);
+            } else if (!tunnel.getName().equals(binding.getName())) {
+                Log.d(TAG, "Attempting to rename tunnel to " + binding.getName());
+                tunnel.setName(binding.getName())
+                        .whenComplete((a, b) -> onTunnelRenamed(tunnel, newConfig, b));
+            } else {
+                Log.d(TAG, "Attempting to save config of " + tunnel.getName());
+                tunnel.setConfig(newConfig)
+                        .whenComplete((a, b) -> onConfigSaved(tunnel, b));
+            }
+            return true;
         }
+        return super.onOptionsItemSelected(item);
     }
 
     public void onRequestSetExcludedApplications(@SuppressWarnings("unused") final View view) {
diff --git a/ui/src/main/java/com/wireguard/android/model/TunnelManager.java b/ui/src/main/java/com/wireguard/android/model/TunnelManager.java
index e370f8de..28dcd18e 100644
--- a/ui/src/main/java/com/wireguard/android/model/TunnelManager.java
+++ b/ui/src/main/java/com/wireguard/android/model/TunnelManager.java
@@ -161,7 +161,7 @@ public final class TunnelManager extends BaseObservable {
         completableTunnels.complete(tunnels);
     }
 
-    public void refreshTunnelStates() {
+    private void refreshTunnelStates() {
         Application.getAsyncWorker().supplyAsync(() -> Application.getBackend().getRunningTunnelNames())
                 .thenAccept(running -> {
                     for (final ObservableTunnel tunnel : tunnels)
diff --git a/ui/src/main/java/com/wireguard/android/preference/ModuleDownloaderPreference.java b/ui/src/main/java/com/wireguard/android/preference/ModuleDownloaderPreference.java
index 86c943b3..750cb05e 100644
--- a/ui/src/main/java/com/wireguard/android/preference/ModuleDownloaderPreference.java
+++ b/ui/src/main/java/com/wireguard/android/preference/ModuleDownloaderPreference.java
@@ -53,12 +53,12 @@ public class ModuleDownloaderPreference extends Preference {
             setState(State.SUCCESS);
             Application.getAsyncWorker().runAsync(() -> {
                 Thread.sleep(1000 * 5);
-                Intent i = getContext().getPackageManager().getLaunchIntentForPackage(getContext().getPackageName());
-                if (i == null)
+                final Intent restartIntent = getContext().getPackageManager().getLaunchIntentForPackage(getContext().getPackageName());
+                if (restartIntent == null)
                     return;
-                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
-                i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-                Application.get().startActivity(i);
+                restartIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                restartIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                Application.get().startActivity(restartIntent);
                 System.exit(0);
             });
         } else
diff --git a/ui/src/main/java/com/wireguard/android/preference/VersionPreference.java b/ui/src/main/java/com/wireguard/android/preference/VersionPreference.java
index 9caec06a..b5c7c5e8 100644
--- a/ui/src/main/java/com/wireguard/android/preference/VersionPreference.java
+++ b/ui/src/main/java/com/wireguard/android/preference/VersionPreference.java
@@ -42,7 +42,7 @@ public class VersionPreference extends Preference {
         });
     }
 
-    private String getBackendPrettyName(final Context context, final Backend backend) {
+    private static String getBackendPrettyName(final Context context, final Backend backend) {
         if (backend instanceof WgQuickBackend)
             return context.getString(R.string.type_name_kernel_module);
         if (backend instanceof GoBackend)
diff --git a/ui/src/main/java/com/wireguard/android/util/DownloadsFileSaver.java b/ui/src/main/java/com/wireguard/android/util/DownloadsFileSaver.java
index c1c667f5..14895b64 100644
--- a/ui/src/main/java/com/wireguard/android/util/DownloadsFileSaver.java
+++ b/ui/src/main/java/com/wireguard/android/util/DownloadsFileSaver.java
@@ -24,7 +24,11 @@ import java.io.IOException;
 import java.io.OutputStream;
 
 @NonNullForAll
-public class DownloadsFileSaver {
+public final class DownloadsFileSaver {
+
+    private DownloadsFileSaver() {
+        // Prevent instantiation
+    }
 
     public static DownloadsFile save(final Context context, final String name, final String mimeType, final boolean overwriteExisting) throws Exception {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
@@ -73,11 +77,11 @@ public class DownloadsFileSaver {
         }
     }
 
-    public static class DownloadsFile {
-        private Context context;
-        private String fileName;
-        private OutputStream outputStream;
-        private Uri uri;
+    public static final class DownloadsFile {
+        private final Context context;
+        private final String fileName;
+        private final OutputStream outputStream;
+        private final Uri uri;
 
         private DownloadsFile(final Context context, final OutputStream outputStream, final String fileName, final Uri uri) {
             this.context = context;