Remove unused code

app/src/main/java/com/hippo/ehviewer/ui/SettingsActivity.java

@@ -16,39 +16,16 @@
 
 package com.hippo.ehviewer.ui;
 
-import android.content.Intent;
-import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.view.MenuItem;
 
 import androidx.appcompat.app.ActionBar;
-import androidx.appcompat.app.ActionBarDrawerToggle;
 
 import com.hippo.ehviewer.R;
 import com.hippo.ehviewer.ui.fragment.SettingsFragment;
-import com.hippo.util.DrawableManager;
 
 public final class SettingsActivity extends EhActivity {
 
-    private static final int REQUEST_CODE_FRAGMENT = 0;
-
-    @Override
-    protected int getThemeResId(int theme) {
-        return R.style.AppTheme_Settings;
-    }
-
-    private void setActionBarUpIndicator(Drawable drawable) {
-        ActionBarDrawerToggle.Delegate delegate = getDrawerToggleDelegate();
-        if (delegate != null) {
-            delegate.setActionBarUpIndicator(drawable, 0);
-        }
-        ActionBar actionBar = getSupportActionBar();
-        if (actionBar != null) {
-            actionBar.setDisplayHomeAsUpEnabled(true);
-            actionBar.setHomeButtonEnabled(true);
-        }
-    }
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -63,7 +40,6 @@ public final class SettingsActivity extends EhActivity {
         if (bar != null) {
             bar.setDisplayHomeAsUpEnabled(true);
         }
-        setActionBarUpIndicator(DrawableManager.getVectorDrawable(this, R.drawable.v_arrow_left_dark_x24));
     }
 
     @Override
@@ -76,15 +52,4 @@ public final class SettingsActivity extends EhActivity {
                 return super.onOptionsItemSelected(item);
         }
     }
-
-    @Override
-    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
-        if (requestCode == REQUEST_CODE_FRAGMENT) {
-            if (resultCode == RESULT_OK) {
-                setResult(RESULT_OK);
-            }
-        } else {
-            super.onActivityResult(requestCode, resultCode, data);
-        }
-    }
 }