ConfigActivity: Inline PlaceholderFragment into the layout

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/android/ConfigActivity.java

@@ -25,7 +25,6 @@ public class ConfigActivity extends BaseConfigActivity {
     private boolean isStateSaved;
     private ConfigListFragment listFragment;
     private int mainContainer;
-    private final PlaceholderFragment placeholderFragment = new PlaceholderFragment();
     private boolean wasUpdateSkipped;
 
     @Override
@@ -153,34 +152,34 @@ public class ConfigActivity extends BaseConfigActivity {
     }
 
     private void switchToFragment(final int container, final String tag, final boolean push) {
-        final Fragment fragment;
         if (tag.equals(TAG_PLACEHOLDER)) {
-            fragment = placeholderFragment;
+            final Fragment oldFragment = fm.findFragmentById(container);
-        } else {
+            if (oldFragment != null)
-            final BaseConfigFragment configFragment;
+                fm.beginTransaction().remove(oldFragment).commit();
-            switch (tag) {
+            return;
-                case TAG_DETAIL:
-                    if (detailFragment == null)
-                        detailFragment = new ConfigDetailFragment();
-                    configFragment = detailFragment;
-                    break;
-                case TAG_EDIT:
-                    if (editFragment == null)
-                        editFragment = new ConfigEditFragment();
-                    configFragment = editFragment;
-                    break;
-                case TAG_LIST:
-                    if (listFragment == null)
-                        listFragment = new ConfigListFragment();
-                    configFragment = listFragment;
-                    break;
-                default:
-                    throw new IllegalArgumentException();
-            }
-            if (configFragment.getCurrentConfig() != getCurrentConfig())
-                configFragment.setCurrentConfig(getCurrentConfig());
-            fragment = configFragment;
         }
+        final BaseConfigFragment fragment;
+        switch (tag) {
+            case TAG_DETAIL:
+                if (detailFragment == null)
+                    detailFragment = new ConfigDetailFragment();
+                fragment = detailFragment;
+                break;
+            case TAG_EDIT:
+                if (editFragment == null)
+                    editFragment = new ConfigEditFragment();
+                fragment = editFragment;
+                break;
+            case TAG_LIST:
+                if (listFragment == null)
+                    listFragment = new ConfigListFragment();
+                fragment = listFragment;
+                break;
+            default:
+                throw new IllegalArgumentException();
+        }
+        if (fragment.getCurrentConfig() != getCurrentConfig())
+            fragment.setCurrentConfig(getCurrentConfig());
         if (fm.findFragmentById(container) != fragment) {
             final FragmentTransaction transaction = fm.beginTransaction();
             if (push) {

app/src/main/java/com/wireguard/android/PlaceholderFragment.java

@@ -1,19 +0,0 @@
-package com.wireguard.android;
-
-import android.app.Fragment;
-import android.os.Bundle;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-/**
- * Fragment that shows a placeholder message.
- */
-
-public class PlaceholderFragment extends Fragment {
-    @Override
-    public View onCreateView(final LayoutInflater inflater, final ViewGroup parent,
-                             final Bundle savedInstanceState) {
-        return inflater.inflate(R.layout.placeholder_fragment, parent, false);
-    }
-}

app/src/main/res/layout-land/config_activity.xml

@@ -20,5 +20,13 @@
         android:background="?android:attr/colorPrimary"
         android:paddingEnd="0dp"
         android:paddingStart="4dp"
-        tools:ignore="InconsistentLayout" />
+        tools:ignore="InconsistentLayout">
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:background="?android:attr/colorBackground"
+            android:gravity="center"
+            android:text="@string/placeholder_text" />
+    </FrameLayout>
 </LinearLayout>

app/src/main/res/layout/placeholder_fragment.xml

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:background="?android:attr/colorBackground"
-    android:gravity="center"
-    android:text="@string/placeholder_text" />