ProfileActivity: Extract base class for fixing fragments

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

app/src/main/AndroidManifest.xml

@@ -12,7 +12,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@android:style/Theme.Material.Light.DarkActionBar">
-        <activity android:name=".ProfileActivity">
+        <activity android:name=".ProfileListActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

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

@@ -1,38 +1,26 @@
 package com.wireguard.android;
 
-import android.app.Fragment;
-import android.app.FragmentManager;
-import android.app.FragmentTransaction;
-import android.content.res.Configuration;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 
 /**
- * Activity that allows creating/viewing/editing/deleting WireGuard profiles.
+ * Base class for activities that use ProfileListFragment and ProfileDetailFragment.
  */
 
-public class ProfileActivity extends ServiceClientActivity<ProfileServiceInterface> {
+class ProfileActivity extends ServiceClientActivity<ProfileServiceInterface> {
     public static final String KEY_PROFILE_NAME = "profile_name";
-
+    protected static final String TAG_DETAIL = "detail";
-    // FIXME: These must match the constants in profile_list_activity.xml
+    protected static final String TAG_LIST = "list";
-    private static final String TAG_DETAIL = "detail";
-    private static final String TAG_LIST = "list";
 
     private String currentProfile;
-    private boolean isSplitLayout;
 
     public ProfileActivity() {
         super(ProfileService.class);
     }
 
-    @Override
+    protected String getCurrentProfile() {
-    public void onBackPressed() {
+        return currentProfile;
-        if (!isSplitLayout && currentProfile != null) {
-            onProfileSelected(null);
-        } else {
-            super.onBackPressed();
-        }
     }
 
     @Override
@@ -43,11 +31,6 @@ public class ProfileActivity extends ServiceClientActivity<ProfileServiceInterfa
             currentProfile = savedInstanceState.getString(KEY_PROFILE_NAME);
         else
             currentProfile = getIntent().getStringExtra(KEY_PROFILE_NAME);
-        // Set up the base layout and fill it with fragments.
-        setContentView(R.layout.profile_activity);
-        final int orientation = getResources().getConfiguration().orientation;
-        isSplitLayout = orientation == Configuration.ORIENTATION_LANDSCAPE;
-        updateLayout(currentProfile);
     }
 
     @Override
@@ -68,42 +51,13 @@ public class ProfileActivity extends ServiceClientActivity<ProfileServiceInterfa
 
     }
 
-    public void onProfileSelected(String profile) {
-        updateLayout(profile);
-        currentProfile = profile;
-    }
-
     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putString(KEY_PROFILE_NAME, currentProfile);
     }
 
-    private void updateLayout(String profile) {
+    protected void setCurrentProfile(String profile) {
-        final FragmentManager fm = getFragmentManager();
+        currentProfile = profile;
-        final Fragment detailFragment = fm.findFragmentByTag(TAG_DETAIL);
-        final Fragment listFragment = fm.findFragmentByTag(TAG_LIST);
-        final FragmentTransaction transaction = fm.beginTransaction();
-        if (profile != null) {
-            if (isSplitLayout) {
-                if (listFragment.isHidden())
-                    transaction.show(listFragment);
-            } else {
-                transaction.hide(listFragment);
-            }
-            if (detailFragment.isHidden())
-                transaction.show(detailFragment);
-        } else {
-            if (isSplitLayout) {
-                if (detailFragment.isHidden())
-                    transaction.show(detailFragment);
-            } else {
-                transaction.hide(detailFragment);
-            }
-            if (listFragment.isHidden())
-                transaction.show(listFragment);
-        }
-        transaction.commit();
-        ((ProfileDetailFragment) detailFragment).setProfile(profile);
     }
 }

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

@@ -0,0 +1,68 @@
+package com.wireguard.android;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.app.FragmentTransaction;
+import android.content.res.Configuration;
+import android.os.Bundle;
+
+/**
+ * Activity that allows creating/viewing/editing/deleting WireGuard profiles.
+ */
+
+public class ProfileListActivity extends ProfileActivity {
+    private boolean isSplitLayout;
+
+    @Override
+    public void onBackPressed() {
+        final FragmentManager fm = getFragmentManager();
+        if (fm.getBackStackEntryCount() > 0) {
+            fm.popBackStack();
+        } else {
+            super.onBackPressed();
+        }
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        // Set up the base layout and fill it with fragments.
+        setContentView(R.layout.profile_list_activity);
+        final int orientation = getResources().getConfiguration().orientation;
+        isSplitLayout = orientation == Configuration.ORIENTATION_LANDSCAPE;
+        updateLayout(getCurrentProfile());
+    }
+
+    public void onProfileSelected(String profile) {
+        updateLayout(profile);
+        setCurrentProfile(profile);
+    }
+
+    private void updateLayout(String profile) {
+        final FragmentManager fm = getFragmentManager();
+        final Fragment detailFragment = fm.findFragmentByTag(TAG_DETAIL);
+        final Fragment listFragment = fm.findFragmentByTag(TAG_LIST);
+        final FragmentTransaction transaction = fm.beginTransaction();
+        if (profile != null) {
+            if (isSplitLayout) {
+                if (listFragment.isHidden())
+                    transaction.show(listFragment);
+            } else {
+                transaction.hide(listFragment);
+            }
+            if (detailFragment.isHidden())
+                transaction.show(detailFragment);
+        } else {
+            if (isSplitLayout) {
+                if (detailFragment.isHidden())
+                    transaction.show(detailFragment);
+            } else {
+                transaction.hide(detailFragment);
+            }
+            if (listFragment.isHidden())
+                transaction.show(listFragment);
+        }
+        transaction.commit();
+        ((ProfileDetailFragment) detailFragment).setProfile(profile);
+    }
+}

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

@@ -25,7 +25,7 @@ public class ProfileListFragment extends ServiceClientFragment<ProfileServiceInt
             @Override
             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                 final Profile profile = (Profile) parent.getItemAtPosition(position);
-                ((ProfileActivity) getActivity()).onProfileSelected(profile.getName());
+                ((ProfileListActivity) getActivity()).onProfileSelected(profile.getName());
             }
         });
         listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {