When viewing images, the list in the background will scroll to the post containing the viewed image.

Chan/src/org/floens/chan/adapter/PostAdapter.java

@@ -13,6 +13,7 @@ import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
+import android.widget.ListView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
@@ -20,13 +21,15 @@ import android.widget.TextView;
 public class PostAdapter extends BaseAdapter {
     private final Context activity;
     private final ThreadManager threadManager;
+    private final ListView listView;
     private boolean endOfLine;
     private int count = 0;
     private final List<Post> postList = new ArrayList<Post>();
     
-    public PostAdapter(Context activity, ThreadManager threadManager) {
+    public PostAdapter(Context activity, ThreadManager threadManager, ListView listView) {
         this.activity = activity;
         this.threadManager = threadManager;
+        this.listView = listView;
     }
 
     @Override
@@ -101,6 +104,16 @@ public class PostAdapter extends BaseAdapter {
         
         notifyDataSetChanged();
     }
+    
+    public void scrollToPost(Post post) {
+        for (int i = 0; i < postList.size(); i++) {
+            if (postList.get(i) == post) {
+                listView.smoothScrollToPosition(i);
+                
+                break;
+            }
+        }
+    }
 }
 
 

Chan/src/org/floens/chan/fragment/ThreadFragment.java

@@ -1,6 +1,5 @@
 package org.floens.chan.fragment;
 
-import java.util.ArrayList;
 import java.util.List;
 
 import org.floens.chan.R;
@@ -96,9 +95,10 @@ public class ThreadFragment extends Fragment implements ThreadListener {
         if (!shown) {
             shown = true;
             
-            postAdapter = new PostAdapter(baseActivity, threadManager);
-            
             listView = new ListView(baseActivity);
+            
+            postAdapter = new PostAdapter(baseActivity, threadManager, listView);
+            
             listView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
             listView.setAdapter(postAdapter);
             listView.setSelectionFromTop(loadable.listViewIndex, loadable.listViewTop);
@@ -147,15 +147,7 @@ public class ThreadFragment extends Fragment implements ThreadListener {
     public void onThumbnailClicked(Post source) {
         if (isDetached() || postAdapter == null) return;
         
-        ArrayList<Post> withImages = new ArrayList<Post>();
-        
-        for (Post post : postAdapter.getList()) {
-            if (post.hasImage){
-                withImages.add(post);
-            }
-        }
-        
-        ImageViewActivity.setPosts(withImages, source.no);
+        ImageViewActivity.setAdapter(postAdapter, source.no);
         
         Intent intent = new Intent(baseActivity, ImageViewActivity.class);
         baseActivity.startActivity(intent);

Chan/src/org/floens/chan/imageview/activity/ImageViewActivity.java

@@ -3,6 +3,7 @@ package org.floens.chan.imageview.activity;
 import java.util.ArrayList;
 
 import org.floens.chan.R;
+import org.floens.chan.adapter.PostAdapter;
 import org.floens.chan.imageview.ImageSaver;
 import org.floens.chan.imageview.adapter.ImageViewAdapter;
 import org.floens.chan.model.Post;
@@ -21,7 +22,7 @@ import android.view.Window;
  * and then start the activity with startActivity()
  */
 public class ImageViewActivity extends Activity implements ViewPager.OnPageChangeListener {
-    private static ArrayList<Post> imagePosts;
+    private static PostAdapter postAdapter;
     private static int selectedId = -1;
     
     private ImageViewAdapter adapter;
@@ -33,8 +34,8 @@ public class ImageViewActivity extends Activity implements ViewPager.OnPageChang
      * @param other the posts to get image data from
      * @param selected the no that the user clicked on
      */
-    public static void setPosts(ArrayList<Post> other, int selected) {
-        imagePosts = other;
+    public static void setAdapter(PostAdapter adapter, int selected) {
+        postAdapter = adapter;
         selectedId = selected;
     }
    
@@ -46,19 +47,26 @@ public class ImageViewActivity extends Activity implements ViewPager.OnPageChang
         
         super.onCreate(savedInstanceState);
         
-        if (imagePosts != null) {
-            setContentView(R.layout.image_pager);
+        if (postAdapter != null) {
+            // Get the posts with images
+            ArrayList<Post> imagePosts = new ArrayList<Post>();
+            for (Post post : postAdapter.getList()) {
+                if (post.hasImage){
+                    imagePosts.add(post);
+                }
+            }
             
+            // Setup our pages and adapter
+            setContentView(R.layout.image_pager);
             ViewPager viewPager = (ViewPager) findViewById(R.id.image_pager);
-            
             adapter = new ImageViewAdapter(getFragmentManager(), this);
             adapter.addToList(imagePosts);
-            
             viewPager.setAdapter(adapter);
             viewPager.setOnPageChangeListener(this);
             
             progressData = new boolean[imagePosts.size()];
             
+            // Select the right image
             for (int i = 0; i < imagePosts.size(); i++) {
                 if (imagePosts.get(i).no == selectedId) {
                     viewPager.setCurrentItem(i);
@@ -66,8 +74,6 @@ public class ImageViewActivity extends Activity implements ViewPager.OnPageChang
                     break;
                 }
             }
-            
-            imagePosts = null;
         } else {
             Log.e("Chan", "Posts in imageview list was null");
             finish();
@@ -78,6 +84,7 @@ public class ImageViewActivity extends Activity implements ViewPager.OnPageChang
     public void finish() {
         super.finish();
         overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
+        postAdapter = null;
     }
     
     @Override
@@ -136,6 +143,10 @@ public class ImageViewActivity extends Activity implements ViewPager.OnPageChang
             
             getActionBar().setTitle(text);
         }
+        
+        if (postAdapter != null) {
+            postAdapter.scrollToPost(post);
+        }
     }
     
     @Override