Android: Minor cleanup

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/AppLinkActivity.java

@@ -30,7 +30,6 @@ public class AppLinkActivity extends FragmentActivity
 
   private AppLinkHelper.PlayAction playAction;
   private DirectoryStateReceiver directoryStateReceiver;
-  private BroadcastReceiver gameFileCacheReceiver;
 
   @Override
   protected void onCreate(Bundle savedInstanceState)
@@ -96,18 +95,17 @@ else if (directoryInitializationState ==
               }
             });
 
-    gameFileCacheReceiver =
-            new BroadcastReceiver()
-            {
-              @Override
-              public void onReceive(Context context, Intent intent)
-              {
-                if (DirectoryInitialization.areDolphinDirectoriesReady())
-                {
-                  tryPlay(playAction);
-                }
-              }
-            };
+    BroadcastReceiver gameFileCacheReceiver = new BroadcastReceiver()
+    {
+      @Override
+      public void onReceive(Context context, Intent intent)
+      {
+        if (DirectoryInitialization.areDolphinDirectoriesReady())
+        {
+          tryPlay(playAction);
+        }
+      }
+    };
 
     LocalBroadcastManager broadcastManager = LocalBroadcastManager.getInstance(this);
     broadcastManager.registerReceiver(directoryStateReceiver, directoryStateIntentFilter);

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.java

@@ -67,7 +67,6 @@ public final class EmulationActivity extends AppCompatActivity
 
   private SharedPreferences mPreferences;
   private MotionListener mMotionListener;
-  private ControllerMappingHelper mControllerMappingHelper;
 
   private Settings mSettings;
 
@@ -317,7 +316,6 @@ protected void onCreate(Bundle savedInstanceState)
     sIsGameCubeGame = Platform.fromNativeInt(mPlatform) == Platform.GAMECUBE;
     mDeviceHasTouchScreen = getPackageManager().hasSystemFeature("android.hardware.touchscreen");
     mMotionListener = new MotionListener(this);
-    mControllerMappingHelper = new ControllerMappingHelper();
 
     int themeId;
     if (mDeviceHasTouchScreen)
@@ -445,19 +443,17 @@ public void onBackPressed()
   protected void onActivityResult(int requestCode, int resultCode, Intent result)
   {
     super.onActivityResult(requestCode, resultCode, result);
-    switch (requestCode)
+    if (requestCode == REQUEST_CHANGE_DISC)
     {
-      case REQUEST_CHANGE_DISC:
-        // If the user picked a file, as opposed to just backing out.
-        if (resultCode == MainActivity.RESULT_OK)
+      // If the user picked a file, as opposed to just backing out.
+      if (resultCode == MainActivity.RESULT_OK)
+      {
+        String newDiscPath = FileBrowserHelper.getSelectedPath(result);
+        if (!TextUtils.isEmpty(newDiscPath))
         {
-          String newDiscPath = FileBrowserHelper.getSelectedPath(result);
-          if (!TextUtils.isEmpty(newDiscPath))
-          {
-            NativeLibrary.ChangeDisc(newDiscPath);
-          }
+          NativeLibrary.ChangeDisc(newDiscPath);
         }
-        break;
+      }
     }
   }
 
@@ -1041,14 +1037,14 @@ private void chooseOrientation()
 
   private void setIRSensitivity()
   {
-    int ir_pitch = Integer.valueOf(
+    int ir_pitch = Integer.parseInt(
             mPreferences.getString(SettingsFile.KEY_WIIBIND_IR_PITCH + mSelectedGameId, "15"));
 
     LayoutInflater inflater = LayoutInflater.from(this);
     View view = inflater.inflate(R.layout.dialog_ir_sensitivity, null);
 
-    TextView text_slider_value_pitch = (TextView) view.findViewById(R.id.text_ir_pitch);
-    TextView units = (TextView) view.findViewById(R.id.text_ir_pitch_units);
+    TextView text_slider_value_pitch = view.findViewById(R.id.text_ir_pitch);
+    TextView units = view.findViewById(R.id.text_ir_pitch_units);
     SeekBar seekbar_pitch = view.findViewById(R.id.seekbar_pitch);
 
     text_slider_value_pitch.setText(String.valueOf(ir_pitch));
@@ -1074,11 +1070,11 @@ private void setIRSensitivity()
       }
     });
 
-    int ir_yaw = Integer.valueOf(
+    int ir_yaw = Integer.parseInt(
             mPreferences.getString(SettingsFile.KEY_WIIBIND_IR_YAW + mSelectedGameId, "15"));
 
-    TextView text_slider_value_yaw = (TextView) view.findViewById(R.id.text_ir_yaw);
-    TextView units_yaw = (TextView) view.findViewById(R.id.text_ir_yaw_units);
+    TextView text_slider_value_yaw = view.findViewById(R.id.text_ir_yaw);
+    TextView units_yaw = view.findViewById(R.id.text_ir_yaw_units);
     SeekBar seekbar_yaw = view.findViewById(R.id.seekbar_width);
 
     text_slider_value_yaw.setText(String.valueOf(ir_yaw));
@@ -1105,14 +1101,12 @@ private void setIRSensitivity()
     });
 
 
-    int ir_vertical_offset = Integer.valueOf(
+    int ir_vertical_offset = Integer.parseInt(
             mPreferences.getString(SettingsFile.KEY_WIIBIND_IR_VERTICAL_OFFSET + mSelectedGameId,
                     "10"));
 
-    TextView text_slider_value_vertical_offset =
-            (TextView) view.findViewById(R.id.text_ir_vertical_offset);
-    TextView units_vertical_offset =
-            (TextView) view.findViewById(R.id.text_ir_vertical_offset_units);
+    TextView text_slider_value_vertical_offset = view.findViewById(R.id.text_ir_vertical_offset);
+    TextView units_vertical_offset = view.findViewById(R.id.text_ir_vertical_offset_units);
     SeekBar seekbar_vertical_offset = view.findViewById(R.id.seekbar_vertical_offset);
 
     text_slider_value_vertical_offset.setText(String.valueOf(ir_vertical_offset));
@@ -1176,9 +1170,7 @@ private void resetOverlay()
     new AlertDialog.Builder(this, R.style.DolphinDialogBase)
             .setTitle(getString(R.string.emulation_touch_overlay_reset))
             .setPositiveButton(R.string.yes, (dialogInterface, i) ->
-            {
-              mEmulationFragment.resetInputOverlay();
-            })
+                    mEmulationFragment.resetInputOverlay())
             .setNegativeButton(R.string.cancel, (dialogInterface, i) ->
             {
             })
@@ -1210,7 +1202,7 @@ public boolean dispatchGenericMotionEvent(MotionEvent event)
     {
       int axis = range.getAxis();
       float origValue = event.getAxisValue(axis);
-      float value = mControllerMappingHelper.scaleAxis(input, axis, origValue);
+      float value = ControllerMappingHelper.scaleAxis(input, axis, origValue);
       // If the input is still in the "flat" area, that means it's really zero.
       // This is used to compensate for imprecision in joysticks.
       if (Math.abs(value) > range.getFlat())

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/adapters/PlatformPagerAdapter.java

@@ -3,6 +3,7 @@
 import android.content.Context;
 import android.graphics.drawable.Drawable;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentPagerAdapter;
@@ -28,10 +29,11 @@ public class PlatformPagerAdapter extends FragmentPagerAdapter
 
   public PlatformPagerAdapter(FragmentManager fm, Context context)
   {
-    super(fm);
+    super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
     mContext = context;
   }
 
+  @NonNull
   @Override
   public Fragment getItem(int position)
   {

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/dialogs/GameDetailsDialog.java

@@ -73,7 +73,7 @@ public Dialog onCreateDialog(Bundle savedInstanceState)
     textCountry.setText(country);
     textCompany.setText(gameFile.getCompany());
     textGameId.setText(gameFile.getGameId());
-    textRevision.setText(Integer.toString(gameFile.getRevision()));
+    textRevision.setText(String.valueOf(gameFile.getRevision()));
 
     if (!gameFile.shouldShowFileFormatDetails())
     {

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/dialogs/MotionAlertDialog.java

@@ -44,20 +44,17 @@ public MotionAlertDialog(Context context, InputBindingSetting setting)
   public boolean onKeyEvent(int keyCode, KeyEvent event)
   {
     Log.debug("[MotionAlertDialog] Received key event: " + event.getAction());
-    switch (event.getAction())
+    if (event.getAction() == KeyEvent.ACTION_UP)
     {
-      case KeyEvent.ACTION_UP:
-        if (!ControllerMappingHelper.shouldKeyBeIgnored(event.getDevice(), keyCode))
-        {
-          setting.onKeyInput(event);
-          dismiss();
-        }
-        // Even if we ignore the key, we still consume it. Thus return true regardless.
-        return true;
-
-      default:
-        return false;
+      if (!ControllerMappingHelper.shouldKeyBeIgnored(event.getDevice(), keyCode))
+      {
+        setting.onKeyInput(event);
+        dismiss();
+      }
+      // Even if we ignore the key, we still consume it. Thus return true regardless.
+      return true;
     }
+    return false;
   }
 
   @Override

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/MenuTag.java

@@ -1,5 +1,7 @@
 package org.dolphinemu.dolphinemu.features.settings.ui;
 
+import androidx.annotation.NonNull;
+
 public enum MenuTag
 {
   CONFIG("config"),
@@ -46,6 +48,7 @@ public enum MenuTag
     this.subType = subtype;
   }
 
+  @NonNull
   @Override
   public String toString()
   {

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsActivityPresenter.java

@@ -143,11 +143,10 @@ public void onStop(boolean finishing)
 
   public boolean handleOptionsItem(int itemId)
   {
-    switch (itemId)
+    if (itemId == R.id.menu_save_exit)
     {
-      case R.id.menu_save_exit:
-        mView.finish();
-        return true;
+      mView.finish();
+      return true;
     }
 
     return false;

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsAdapter.java

@@ -2,8 +2,6 @@
 
 import android.content.Context;
 import android.content.DialogInterface;
-import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
 
 import androidx.appcompat.app.AlertDialog;
 import androidx.recyclerview.widget.RecyclerView;
@@ -45,7 +43,6 @@
 import org.dolphinemu.dolphinemu.features.settings.utils.SettingsFile;
 import org.dolphinemu.dolphinemu.ui.main.MainPresenter;
 import org.dolphinemu.dolphinemu.utils.FileBrowserHelper;
-import org.dolphinemu.dolphinemu.utils.Log;
 
 import java.security.InvalidParameterException;
 import java.util.ArrayList;
@@ -97,7 +94,7 @@ public SettingViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
 
       case SettingsItem.TYPE_SLIDER:
         view = inflater.inflate(R.layout.list_item_setting, parent, false);
-        return new SliderViewHolder(view, this);
+        return new SliderViewHolder(view, this, mContext);
 
       case SettingsItem.TYPE_SUBMENU:
         view = inflater.inflate(R.layout.list_item_setting_submenu, parent, false);
@@ -120,8 +117,7 @@ public SettingViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
         return new ConfirmRunnableViewHolder(view, this, mContext, mView);
 
       default:
-        Log.error("[SettingsAdapter] Invalid view type: " + viewType);
-        return null;
+        throw new IllegalArgumentException("Invalid view type: " + viewType);
     }
   }
 
@@ -243,13 +239,13 @@ public void onSliderClick(SliderSetting item, int position)
     builder.setPositiveButton(R.string.ok, this);
     mDialog = builder.show();
 
-    mTextSliderValue = (TextView) view.findViewById(R.id.text_value);
+    mTextSliderValue = view.findViewById(R.id.text_value);
     mTextSliderValue.setText(String.valueOf(mSeekbarProgress));
 
-    TextView units = (TextView) view.findViewById(R.id.text_units);
+    TextView units = view.findViewById(R.id.text_units);
     units.setText(item.getUnits());
 
-    SeekBar seekbar = (SeekBar) view.findViewById(R.id.seekbar);
+    SeekBar seekbar = view.findViewById(R.id.seekbar);
 
     seekbar.setMax(item.getMax());
     seekbar.setProgress(mSeekbarProgress);
@@ -273,21 +269,13 @@ public void onInputBindingClick(final InputBindingSetting item, final int positi
             mContext.getString(item.getNameId())));
     dialog.setButton(AlertDialog.BUTTON_NEGATIVE, mContext.getString(R.string.cancel), this);
     dialog.setButton(AlertDialog.BUTTON_NEUTRAL, mContext.getString(R.string.clear),
-            (dialogInterface, i) ->
-            {
-              SharedPreferences preferences =
-                      PreferenceManager.getDefaultSharedPreferences(mContext);
-              item.clearValue();
-            });
+            (dialogInterface, i) -> item.clearValue());
     dialog.setOnDismissListener(dialog1 ->
     {
       StringSetting setting = new StringSetting(item.getKey(), item.getSection(), item.getValue());
       notifyItemChanged(position);
 
-      if (setting != null)
-      {
-        mView.putSetting(setting);
-      }
+      mView.putSetting(setting);
 
       mView.onSettingChanged(item.getKey());
     });

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragment.java

@@ -3,6 +3,7 @@
 import android.content.Context;
 import android.os.Bundle;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
@@ -84,7 +85,7 @@ public static Fragment newInstance(MenuTag menuTag, String gameId, Bundle extras
   }
 
   @Override
-  public void onAttach(Context context)
+  public void onAttach(@NonNull Context context)
   {
     super.onAttach(context);
 
@@ -115,7 +116,7 @@ public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
   }
 
   @Override
-  public void onViewCreated(View view, @Nullable Bundle savedInstanceState)
+  public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState)
   {
     Bundle args = getArguments();
     MenuTag menuTag = (MenuTag) args.getSerializable(ARGUMENT_MENU_TAG);

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragmentPresenter.java

@@ -59,8 +59,8 @@ public SettingsFragmentPresenter(SettingsFragmentView view)
   public void onCreate(MenuTag menuTag, String gameId, Bundle extras)
   {
     mGameID = gameId;
-
     this.mMenuTag = menuTag;
+
     if (menuTag.isGCPadMenu() || menuTag.isWiimoteExtensionMenu())
     {
       mControllerNumber = menuTag.getSubType();
@@ -70,10 +70,6 @@ else if (menuTag.isWiimoteMenu())
     {
       mControllerNumber = menuTag.getSubType();
     }
-    else
-    {
-      mMenuTag = menuTag;
-    }
   }
 
   public void onViewCreated(MenuTag menuTag, Settings settings)

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFrameLayout.java

@@ -9,8 +9,6 @@
  */
 public final class SettingsFrameLayout extends FrameLayout
 {
-  private float mVisibleness = 1.0f;
-
   public SettingsFrameLayout(Context context)
   {
     super(context);
@@ -44,7 +42,7 @@ public void setYFraction(float yFraction)
 
   public float getVisibleness()
   {
-    return mVisibleness;
+    return 1.0f;
   }
 
   public void setVisibleness(float visibleness)

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/viewholder/CheckBoxSettingViewHolder.java

@@ -28,9 +28,9 @@ public CheckBoxSettingViewHolder(View itemView, SettingsAdapter adapter)
   @Override
   protected void findViews(View root)
   {
-    mTextSettingName = (TextView) root.findViewById(R.id.text_setting_name);
-    mTextSettingDescription = (TextView) root.findViewById(R.id.text_setting_description);
-    mCheckbox = (CheckBox) root.findViewById(R.id.checkbox);
+    mTextSettingName = root.findViewById(R.id.text_setting_name);
+    mTextSettingDescription = root.findViewById(R.id.text_setting_description);
+    mCheckbox = root.findViewById(R.id.checkbox);
   }
 
   @Override