"All images" view for conversations

// FREEBIE

AndroidManifest.xml

@@ -209,6 +209,10 @@
               android:launchMode="singleTask"
               android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout|screenSize"/>
 
+    <activity android:name=".MediaOverviewActivity"
+              android:windowSoftInputMode="stateHidden"
+              android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout|screenSize"/>
+
     <activity android:name=".DummyActivity"
               android:theme="@android:style/Theme.NoDisplay"
               android:enabled="true"

build.gradle

@@ -44,6 +44,7 @@ dependencies {
     compile 'com.afollestad:material-dialogs:0.6.1.5'
     compile 'com.soundcloud.android:android-crop:0.9.10@aar'
     compile 'com.android.support:appcompat-v7:21.0.3'
+    compile 'com.android.support:recyclerview-v7:21.0.3'
     compile 'com.melnykov:floatingactionbutton:1.1.0'
     compile 'com.google.zxing:android-integration:3.1.0'
     compile ('com.android.support:support-v4-preferencefragment:1.0.0@aar'){
@@ -89,6 +90,7 @@ dependencyVerification {
             'com.afollestad:material-dialogs:ccb013e6572c86cfcca433855cf0dbfbff9b5e7bb9d1f504b761a6bc6f467b60',
             'com.soundcloud.android:android-crop:ffd4b973cf6e97f7d64118a0dc088df50e9066fd5634fe6911dd0c0c5d346177',
             'com.android.support:appcompat-v7:5dbeb5316d0a6027d646ae552804c3baa5e3bd53f7f33db50904d51505c8a0e5',
+            'com.android.support:recyclerview-v7:e525ad3f33c84bb12b73d2dc975b55364a53f0f2d0697e043efba59ba73e22d2',
             'com.melnykov:floatingactionbutton:0679ad9f7d61eb7aeab91e8dc56358cdedd5b1c1b9c48464499ffa05c40d3985',
             'com.google.zxing:android-integration:89e56aadf1164bd71e57949163c53abf90af368b51669c0d4a47a163335f95c4',
             'com.android.support:support-v4-preferencefragment:5470f5872514a6226fa1fc6f4e000991f38805691c534cf0bd2778911fc773ad',
@@ -96,7 +98,6 @@ dependencyVerification {
             'com.doomonafireball.betterpickers:library:132ecd685c95a99e7377c4e27bfadbb2d7ed0bea995944060cd62d4369fdaf3d',
             'org.whispersystems:jobmanager:01f35586c43aa3806f1c18d3d6a5a972def98103ba1a5a9ca3eec08d15f974b7',
             'org.whispersystems:libpastelog:3ccf00fe1597eb8ca1e5de99b17fc225387a1b80b5bbc00ec1bc4d4f3ea9cdde',
-            'com.android.support:recyclerview-v7:ab2390d688601b65e2f3a0718b3d25487e61546c4e20f81eb0b033f30ca15b31',
             'com.nineoldandroids:library:68025a14e3e7673d6ad2f95e4b46d78d7d068343aa99256b686fe59de1b3163a',
             'javax.inject:javax.inject:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
             'com.google.protobuf:protobuf-java:e0c1c64575c005601725e7c6a02cebf9e1285e888f756b2a1d73ffa8d725cc74',

res/layout/media_overview_activity.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                xmlns:app="http://schemas.android.com/apk/res-auto"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:background="@color/gray95">
+
+    <android.support.v7.widget.RecyclerView
+            android:id="@+id/media_grid"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
+    <TextView android:id="@+id/no_images"
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:textColor="@android:color/white"
+              android:textStyle="italic"
+              android:textSize="24sp"
+              android:gravity="center_horizontal"
+              android:paddingTop="30dp"
+              android:visibility="gone"
+              android:text="@string/media_overview_activity__no_images" />
+
+</RelativeLayout>

res/layout/media_overview_item.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<org.thoughtcrime.securesms.components.SquareLinearLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+    <ImageView android:id="@+id/image"
+               android:layout_width="match_parent"
+               android:layout_height="match_parent"
+               android:scaleType="centerCrop"
+               android:contentDescription="@string/media_preview_activity__image_content_description" />
+
+</org.thoughtcrime.securesms.components.SquareLinearLayout>

res/menu/conversation.xml

@@ -2,11 +2,12 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
 
     <item android:title="@string/conversation__menu_add_attachment"
-          android:id="@+id/menu_add_attachment"
-          android:icon="@drawable/ic_menu_attach" />
+          android:id="@+id/menu_add_attachment" />
+
+    <item android:title="@string/conversation__menu_view_media"
+          android:id="@+id/menu_view_media" />
 
     <item android:title="@string/conversation__menu_delete_thread"
-          android:id="@+id/menu_delete_thread"
-          android:icon="@android:drawable/ic_menu_delete" />
+          android:id="@+id/menu_delete_thread" />
 
 </menu>

res/values-land/dimens.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <integer name="media_overview_cols">5</integer>
+</resources>

res/values/dimens.xml

@@ -14,4 +14,6 @@
     <dimen name="contact_selection_photo_size">50dp</dimen>
     <dimen name="thumbnail_max_size">230dp</dimen>
     <dimen name="preference_fragment_padding_side">8dp</dimen>
+
+    <integer name="media_overview_cols">3</integer>
 </resources>

res/values/strings.xml

@@ -526,6 +526,9 @@
     <string name="import_fragment__import_a_plaintext_backup_file">
         Import a plaintext backup file. Compatible with \'SMSBackup And Restore.\'</string>
 
+    <!-- media_overview_activity -->
+    <string name="media_overview_activity__no_images">No images</string>
+
     <!-- MmsPreferencesFragment -->
     <string name="MmsPreferencesFragment__manual_mms_settings_are_required">Manual MMS settings are required for your phone.</string>
     <string name="MmsPreferencesFragment__enabled">Enabled</string>
@@ -650,6 +653,8 @@
     <string name="AndroidManifest__complete_key_exchange">Complete key exchange</string>
     <string name="AndroidManifest__log_submit">Submit debug logs</string>
     <string name="AndroidManifest__media_preview">Media Preview</string>
+    <string name="AndroidManifest__media_overview">All images</string>
+    <string name="AndroidManifest__media_overview_named">All images with %1$s</string>
 
     <!-- arrays.xml -->
     <string name="arrays__import_export">Import / export</string>
@@ -823,6 +828,7 @@
     <string name="conversation__menu_update_group">Update group</string>
     <string name="conversation__menu_leave_group">Leave group</string>
     <string name="conversation__menu_delete_thread">Delete thread</string>
+    <string name="conversation__menu_view_media">All images</string>
 
     <!-- conversation_callable -->
     <string name="conversation_add_to_contacts__menu_add_to_contacts">Add to contacts</string>

src/org/thoughtcrime/securesms/ConversationActivity.java

@@ -310,6 +310,7 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     case R.id.menu_call:                      handleDial(getRecipients().getPrimaryRecipient()); return true;
     case R.id.menu_delete_thread:             handleDeleteThread();                              return true;
     case R.id.menu_add_attachment:            handleAddAttachment();                             return true;
+    case R.id.menu_view_media:                handleViewMedia();                                 return true;
     case R.id.menu_add_to_contacts:           handleAddToContacts();                             return true;
     case R.id.menu_start_secure_session:      handleStartSecureSession();                        return true;
     case R.id.menu_abort_session:             handleAbortSecureSession();                        return true;
@@ -423,6 +424,14 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     builder.show();
   }
 
+  private void handleViewMedia() {
+    Intent intent = new Intent(this, MediaOverviewActivity.class);
+    intent.putExtra(MediaOverviewActivity.THREAD_ID_EXTRA, threadId);
+    intent.putExtra(MediaOverviewActivity.RECIPIENT_EXTRA, recipients.getPrimaryRecipient().getRecipientId());
+    intent.putExtra(MediaOverviewActivity.MASTER_SECRET_EXTRA, masterSecret);
+    startActivity(intent);
+  }
+
   private void handleLeavePushGroup() {
     if (getRecipients() == null) {
       Toast.makeText(this, getString(R.string.ConversationActivity_invalid_recipient),

src/org/thoughtcrime/securesms/ImageMediaAdapter.java

@@ -0,0 +1,118 @@
+/**
+ * Copyright (C) 2015 Open Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.thoughtcrime.securesms;
+
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.graphics.drawable.ColorDrawable;
+import android.support.v7.widget.RecyclerView;
+import android.text.TextUtils;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+
+import org.thoughtcrime.securesms.ImageMediaAdapter.ViewHolder;
+import org.thoughtcrime.securesms.crypto.MasterSecret;
+import org.thoughtcrime.securesms.database.CursorRecyclerViewAdapter;
+import org.thoughtcrime.securesms.database.PartDatabase.ImageRecord;
+import org.thoughtcrime.securesms.mms.Slide;
+import org.thoughtcrime.securesms.recipients.RecipientFactory;
+import org.thoughtcrime.securesms.recipients.RecipientFormattingException;
+import org.thoughtcrime.securesms.recipients.Recipients;
+import org.thoughtcrime.securesms.util.MediaUtil;
+
+import ws.com.google.android.mms.pdu.PduPart;
+
+public class ImageMediaAdapter extends CursorRecyclerViewAdapter<ViewHolder> {
+  private static final String TAG = ImageMediaAdapter.class.getSimpleName();
+
+  private final MasterSecret masterSecret;
+  private final int          gridSize;
+
+  public static class ViewHolder extends RecyclerView.ViewHolder {
+    public ImageView   imageView;
+
+    public ViewHolder(View v) {
+      super(v);
+      imageView = (ImageView) v.findViewById(R.id.image);
+    }
+  }
+
+  public ImageMediaAdapter(Context context, MasterSecret masterSecret, Cursor c) {
+    super(context, c);
+    this.masterSecret = masterSecret;
+    this.gridSize     = context.getResources().getDimensionPixelSize(R.dimen.thumbnail_max_size);
+  }
+
+  @Override
+  public ViewHolder onCreateViewHolder(final ViewGroup viewGroup, final int i) {
+    final View view = LayoutInflater.from(getContext()).inflate(R.layout.media_overview_item, viewGroup, false);
+    return new ViewHolder(view);
+  }
+
+  @Override
+  public void onBindViewHolder(final ViewHolder viewHolder, final Cursor cursor) {
+    final ImageView   imageView   = viewHolder.imageView;
+    final ImageRecord imageRecord = ImageRecord.from(cursor);
+
+    PduPart part = new PduPart();
+
+    part.setDataUri(imageRecord.getUri());
+    part.setContentType(imageRecord.getContentType().getBytes());
+    part.setId(imageRecord.getPartId());
+
+    Slide slide = MediaUtil.getSlideForPart(getContext(), masterSecret, part, imageRecord.getContentType());
+    if (slide != null) slide.setThumbnailOn(imageView, gridSize, gridSize, new ColorDrawable(0x11ffffff));
+
+    imageView.setOnClickListener(new OnMediaClickListener(imageRecord));
+  }
+
+  private class OnMediaClickListener implements OnClickListener {
+    private ImageRecord record;
+
+    private OnMediaClickListener(ImageRecord record) {
+      this.record = record;
+    }
+
+    @Override
+    public void onClick(View v) {
+      Intent intent = new Intent(getContext(), MediaPreviewActivity.class);
+      intent.putExtra(MediaPreviewActivity.MASTER_SECRET_EXTRA, masterSecret);
+      intent.putExtra(MediaPreviewActivity.DATE_EXTRA, record.getDate());
+
+      if (!TextUtils.isEmpty(record.getAddress())) {
+        try {
+          Recipients recipients = RecipientFactory.getRecipientsFromString(getContext(),
+                                                                           record.getAddress(),
+                                                                           true);
+          if (recipients != null && recipients.getPrimaryRecipient() != null) {
+            intent.putExtra(MediaPreviewActivity.RECIPIENT_EXTRA, recipients.getPrimaryRecipient().getRecipientId());
+          }
+        } catch (RecipientFormattingException rfe) {
+          Log.w(TAG, rfe);
+        }
+      }
+      intent.setDataAndType(record.getUri(), record.getContentType());
+      getContext().startActivity(intent);
+
+    }
+  }
+}

src/org/thoughtcrime/securesms/MediaOverviewActivity.java

@@ -0,0 +1,179 @@
+/**
+ * Copyright (C) 2015 Open Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.thoughtcrime.securesms;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.res.Configuration;
+import android.database.Cursor;
+import android.os.Build.VERSION;
+import android.os.Build.VERSION_CODES;
+import android.os.Bundle;
+import android.support.v4.app.LoaderManager;
+import android.support.v4.content.Loader;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.util.Log;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.WindowManager;
+import android.widget.TextView;
+
+import org.thoughtcrime.securesms.crypto.MasterSecret;
+import org.thoughtcrime.securesms.database.CursorRecyclerViewAdapter;
+import org.thoughtcrime.securesms.database.DatabaseFactory;
+import org.thoughtcrime.securesms.recipients.Recipient;
+import org.thoughtcrime.securesms.recipients.Recipient.RecipientModifiedListener;
+import org.thoughtcrime.securesms.recipients.RecipientFactory;
+import org.thoughtcrime.securesms.util.AbstractCursorLoader;
+import org.thoughtcrime.securesms.util.DynamicLanguage;
+
+/**
+ * Activity for displaying media attachments in-app
+ */
+public class MediaOverviewActivity extends PassphraseRequiredActionBarActivity implements LoaderManager.LoaderCallbacks<Cursor> {
+  private final static String TAG = MediaOverviewActivity.class.getSimpleName();
+
+  public final static String MASTER_SECRET_EXTRA = "master_secret";
+  public final static String RECIPIENT_EXTRA     = "recipient";
+  public final static String THREAD_ID_EXTRA     = "thread_id";
+
+  private final DynamicLanguage dynamicLanguage = new DynamicLanguage();
+
+  private MasterSecret masterSecret;
+
+  private RecyclerView      gridView;
+  private GridLayoutManager gridManager;
+  private TextView          noImages;
+  private Recipient         recipient;
+  private long              threadId;
+
+  @Override
+  protected void onCreate(Bundle bundle) {
+    this.setTheme(R.style.TextSecure_DarkTheme);
+    dynamicLanguage.onCreate(this);
+
+    super.onCreate(bundle);
+    setFullscreenIfPossible();
+
+    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+    setContentView(R.layout.media_overview_activity);
+
+    initializeResources();
+    initializeActionBar();
+    getSupportLoaderManager().initLoader(0, null, MediaOverviewActivity.this);
+  }
+
+  @Override
+  public void onConfigurationChanged(Configuration newConfig) {
+    super.onConfigurationChanged(newConfig);
+    if (gridManager != null) gridManager.setSpanCount(getResources().getInteger(R.integer.media_overview_cols));
+  }
+
+  @TargetApi(VERSION_CODES.JELLY_BEAN)
+  private void setFullscreenIfPossible() {
+    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
+                         WindowManager.LayoutParams.FLAG_FULLSCREEN);
+
+    if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) {
+      getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);
+    }
+  }
+
+  @Override
+  public void onResume() {
+    super.onResume();
+    dynamicLanguage.onResume(this);
+  }
+
+  private void initializeActionBar() {
+    getSupportActionBar().setTitle(recipient == null
+                                   ? getString(R.string.AndroidManifest__media_overview)
+                                   : getString(R.string.AndroidManifest__media_overview_named, recipient.toShortString()));
+  }
+
+  @Override
+  public void onPause() {
+    super.onPause();
+  }
+
+  private void initializeResources() {
+    masterSecret = getIntent().getParcelableExtra(MASTER_SECRET_EXTRA);
+    threadId     = getIntent().getLongExtra(THREAD_ID_EXTRA, -1);
+
+    noImages = (TextView    ) findViewById(R.id.no_images );
+    gridView = (RecyclerView) findViewById(R.id.media_grid);
+    gridManager = new GridLayoutManager(this, getResources().getInteger(R.integer.media_overview_cols));
+    gridView.setLayoutManager(gridManager);
+    gridView.setHasFixedSize(true);
+
+    final long recipientId = getIntent().getLongExtra(RECIPIENT_EXTRA, -1);
+    if (recipientId > -1) {
+      recipient = RecipientFactory.getRecipientForId(this, recipientId, true);
+      recipient.addListener(new RecipientModifiedListener() {
+        @Override
+        public void onModified(Recipient recipient) {
+          initializeActionBar();
+        }
+      });
+    } else {
+      recipient = null;
+    }
+  }
+
+  @Override
+  public boolean onOptionsItemSelected(MenuItem item) {
+    super.onOptionsItemSelected(item);
+
+    switch (item.getItemId()) {
+    case android.R.id.home: finish(); return true;
+    }
+
+    return false;
+  }
+
+  @Override
+  public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
+    return new ThreadMediaLoader(this, threadId);
+  }
+
+  @Override
+  public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
+    Log.w(TAG, "onLoadFinished()");
+    gridView.setAdapter(new ImageMediaAdapter(this, masterSecret, cursor));
+    noImages.setVisibility(gridView.getAdapter().getItemCount() > 0 ? View.GONE : View.VISIBLE);
+  }
+
+  @Override
+  public void onLoaderReset(Loader<Cursor> cursorLoader) {
+    ((CursorRecyclerViewAdapter)gridView.getAdapter()).changeCursor(null);
+  }
+
+  public static class ThreadMediaLoader extends AbstractCursorLoader {
+    private final long threadId;
+
+    public ThreadMediaLoader(Context context, long threadId) {
+      super(context);
+      this.threadId = threadId;
+    }
+
+    @Override
+    public Cursor getCursor() {
+      return DatabaseFactory.getPartDatabase(getContext()).getImagesForThread(threadId);
+    }
+  }
+}

src/org/thoughtcrime/securesms/components/SquareLinearLayout.java

@@ -0,0 +1,35 @@
+package org.thoughtcrime.securesms.components;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build.VERSION_CODES;
+import android.util.AttributeSet;
+import android.widget.LinearLayout;
+
+public class SquareLinearLayout extends LinearLayout {
+  @SuppressWarnings("unused")
+  public SquareLinearLayout(Context context) {
+    super(context);
+  }
+
+  @SuppressWarnings("unused")
+  public SquareLinearLayout(Context context, AttributeSet attrs) {
+    super(context, attrs);
+  }
+
+  @TargetApi(VERSION_CODES.HONEYCOMB) @SuppressWarnings("unused")
+  public SquareLinearLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+    super(context, attrs, defStyleAttr);
+  }
+
+  @TargetApi(VERSION_CODES.LOLLIPOP) @SuppressWarnings("unused")
+  public SquareLinearLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+    super(context, attrs, defStyleAttr, defStyleRes);
+  }
+
+  @Override
+  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+    //noinspection SuspiciousNameCombination
+    super.onMeasure(widthMeasureSpec, widthMeasureSpec);
+  }
+}

src/org/thoughtcrime/securesms/database/CursorRecyclerViewAdapter.java

@@ -0,0 +1,125 @@
+/**
+ * Copyright (C) 2015 Open Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.thoughtcrime.securesms.database;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.database.DataSetObserver;
+import android.support.v7.widget.RecyclerView;
+
+/**
+ * RecyclerView.Adapter that manages a Cursor, comparable to the CursorAdapter usable in ListView/GridView.
+ */
+public abstract class CursorRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {
+  private final Context         context;
+  private final DataSetObserver observer = new AdapterDataSetObserver();
+
+  private Cursor  cursor;
+  private boolean valid;
+
+  protected CursorRecyclerViewAdapter(Context context, Cursor cursor) {
+    this.context = context;
+    this.cursor = cursor;
+    if (cursor != null) {
+      valid = true;
+      cursor.registerDataSetObserver(observer);
+    }
+
+    setHasStableIds(true);
+  }
+
+  public Context getContext() {
+    return context;
+  }
+
+  public Cursor getCursor() {
+    return cursor;
+  }
+
+  public void changeCursor(Cursor cursor) {
+    Cursor old = swapCursor(cursor);
+    if (old != null) {
+      old.close();
+    }
+  }
+
+  public Cursor swapCursor(Cursor newCursor) {
+    if (newCursor == cursor) {
+      return null;
+    }
+
+    final Cursor oldCursor = cursor;
+    if (oldCursor != null) {
+      oldCursor.unregisterDataSetObserver(observer);
+    }
+
+    cursor = newCursor;
+    if (cursor != null) {
+      cursor.registerDataSetObserver(observer);
+    }
+
+    valid = cursor != null;
+    notifyDataSetChanged();
+    return oldCursor;
+  }
+
+
+  @Override
+  public int getItemCount() {
+    return isActiveCursor() ? cursor.getCount() : 0;
+  }
+
+  @Override
+  public long getItemId(int position) {
+    return isActiveCursor() && cursor.moveToPosition(position)
+           ? cursor.getLong(cursor.getColumnIndexOrThrow("_id"))
+           : 0;
+  }
+
+  public abstract void onBindViewHolder(VH viewHolder, Cursor cursor);
+
+  @Override
+  public void onBindViewHolder(VH viewHolder, int position) {
+    if (!isActiveCursor()) {
+      throw new IllegalStateException("this should only be called when the cursor is valid");
+    }
+    if (!cursor.moveToPosition(position)) {
+      throw new IllegalStateException("couldn't move cursor to position " + position);
+    }
+    onBindViewHolder(viewHolder, cursor);
+  }
+
+  private boolean isActiveCursor() {
+    return valid && cursor != null;
+  }
+
+  private class AdapterDataSetObserver extends DataSetObserver {
+    @Override
+    public void onChanged() {
+      super.onChanged();
+      valid = true;
+      notifyDataSetChanged();
+    }
+
+    @Override
+    public void onInvalidated() {
+      super.onInvalidated();
+      valid = false;
+      notifyDataSetChanged();
+    }
+  }
+}

src/org/thoughtcrime/securesms/database/PartDatabase.java

@@ -23,12 +23,14 @@ import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;
 import android.graphics.Bitmap;
+import android.net.Uri;
 import android.text.TextUtils;
 import android.util.Log;
 import android.util.Pair;
 
 import org.thoughtcrime.securesms.crypto.DecryptingPartInputStream;
 import org.thoughtcrime.securesms.crypto.EncryptingPartOutputStream;
+import org.thoughtcrime.securesms.crypto.MasterCipher;
 import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.mms.PartAuthority;
 import org.thoughtcrime.securesms.util.BitmapDecodingException;
@@ -91,6 +93,20 @@ public class PartDatabase extends Database {
     "CREATE INDEX IF NOT EXISTS pending_push_index ON " + TABLE_NAME + " (" + PENDING_PUSH_ATTACHMENT + ");",
   };
 
+  private final static String IMAGES_QUERY = "SELECT " + TABLE_NAME + "." + ID + ", "
+                                                       + TABLE_NAME + "." + CONTENT_TYPE + ", "
+                                                       + TABLE_NAME + "." + ASPECT_RATIO + ", "
+                                                       + MmsDatabase.TABLE_NAME + "." + MmsDatabase.NORMALIZED_DATE_RECEIVED + ", "
+                                                       + MmsDatabase.TABLE_NAME + "." + MmsDatabase.ADDRESS + " "
+                                           + "FROM " + TABLE_NAME + " LEFT JOIN " + MmsDatabase.TABLE_NAME
+                                                                  + " ON " + TABLE_NAME + "." + MMS_ID + " = " + MmsDatabase.TABLE_NAME + "." + MmsDatabase.ID + " "
+                                           + "WHERE " + MMS_ID + " IN (SELECT " + MmsSmsColumns.ID
+                                                                   + " FROM " + MmsDatabase.TABLE_NAME
+                                                                   + " WHERE " + MmsDatabase.THREAD_ID + " = ?) AND "
+                                                      + CONTENT_TYPE + " LIKE 'image/%' "
+                                           + "ORDER BY " + TABLE_NAME + "." + ID + " DESC";
+
+
   private final ExecutorService thumbnailExecutor = Util.newSingleThreadedLifoExecutor();
 
   public PartDatabase(Context context, SQLiteOpenHelper databaseHelper) {
@@ -135,6 +151,13 @@ public class PartDatabase extends Database {
     }
   }
 
+  public Cursor getImagesForThread(long threadId) {
+    SQLiteDatabase database = databaseHelper.getReadableDatabase();
+    Cursor cursor = database.rawQuery(IMAGES_QUERY, new String[]{threadId+""});
+    setNotifyConverationListeners(cursor, threadId);
+    return cursor;
+  }
+
   public List<Pair<Long, PduPart>> getParts(long mmsId) {
     SQLiteDatabase            database = databaseHelper.getReadableDatabase();
     List<Pair<Long, PduPart>> results  = new LinkedList<>();
@@ -509,6 +532,47 @@ public class PartDatabase extends Database {
     database.update(TABLE_NAME, values, ID_WHERE, new String[]{partId+""});
   }
 
+  public static class ImageRecord {
+    private long   partId;
+    private String contentType;
+    private String address;
+    private long   date;
+
+    private ImageRecord(long partId, String contentType, String address, long date) {
+      this.partId      = partId;
+      this.contentType = contentType;
+      this.address     = address;
+      this.date        = date;
+    }
+
+    public static ImageRecord from(Cursor cursor) {
+      return new ImageRecord(cursor.getLong(cursor.getColumnIndexOrThrow(ID)),
+                             cursor.getString(cursor.getColumnIndexOrThrow(CONTENT_TYPE)),
+                             cursor.getString(cursor.getColumnIndexOrThrow(MmsDatabase.ADDRESS)),
+                             cursor.getLong(cursor.getColumnIndexOrThrow(MmsDatabase.NORMALIZED_DATE_RECEIVED)) * 1000);
+    }
+
+    public long getPartId() {
+      return partId;
+    }
+
+    public String getContentType() {
+      return contentType;
+    }
+
+    public String getAddress() {
+      return address;
+    }
+
+    public long getDate() {
+      return date;
+    }
+
+    public Uri getUri() {
+      return ContentUris.withAppendedId(PartAuthority.PART_CONTENT_URI, getPartId());
+    }
+  }
+
   @VisibleForTesting class ThumbnailFetchCallable implements Callable<InputStream> {
     private final MasterSecret masterSecret;
     private final long         partId;

src/org/thoughtcrime/securesms/mms/AudioSlide.java

@@ -19,6 +19,7 @@ package org.thoughtcrime.securesms.mms;
 import java.io.IOException;
 
 import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.util.SmilUtil;
 import org.w3c.dom.smil.SMILDocument;
 import org.w3c.dom.smil.SMILMediaElement;
@@ -34,14 +35,14 @@ import android.provider.MediaStore.Audio;
 
 public class AudioSlide extends Slide {
 
-  public AudioSlide(Context context, PduPart part) {
-    super(context, part);
-  }
-
   public AudioSlide(Context context, Uri uri) throws IOException, MediaTooLargeException {
     super(context, constructPartFromUri(context, uri));
   }
 
+  public AudioSlide(Context context, MasterSecret masterSecret, PduPart part) {
+    super(context, masterSecret, part);
+  }
+
   @Override
     public boolean hasImage() {
     return true;

src/org/thoughtcrime/securesms/mms/ImageSlide.java

@@ -112,6 +112,11 @@ public class ImageSlide extends Slide {
 
   @Override
   public void setThumbnailOn(ImageView imageView) {
+    setThumbnailOn(imageView, imageView.getWidth(), imageView.getHeight(), new ColorDrawable(Color.TRANSPARENT));
+  }
+
+  @Override
+  public void setThumbnailOn(ImageView imageView, final int width, final int height, final Drawable placeholder) {
     Drawable thumbnail = getCachedThumbnail();
 
     if (thumbnail != null) {
@@ -120,24 +125,22 @@ public class ImageSlide extends Slide {
       return;
     }
 
-    final ColorDrawable temporaryDrawable        = new ColorDrawable(Color.TRANSPARENT);
-    final WeakReference<ImageView> weakImageView = new WeakReference<ImageView>(imageView);
+    final WeakReference<ImageView> weakImageView = new WeakReference<>(imageView);
     final Handler handler                        = new Handler();
-    final int maxWidth                           = imageView.getWidth();
-    final int maxHeight                          = imageView.getHeight();
 
-    imageView.setImageDrawable(temporaryDrawable);
+    imageView.setImageDrawable(placeholder);
 
-    if (maxWidth == 0 || maxHeight == 0)
+    if (width == 0 || height == 0)
       return;
 
     MmsDatabase.slideResolver.execute(new Runnable() {
       @Override
       public void run() {
-        final Drawable bitmap = getThumbnail(maxWidth, maxHeight);
+        final Drawable bitmap = getThumbnail(width, height);
         final ImageView destination = weakImageView.get();
 
-        if (destination != null && destination.getDrawable() == temporaryDrawable) {
+        Log.w(TAG, "slide resolved, destination available? " + (destination == null));
+        if (destination != null && destination.getDrawable() == placeholder) {
           handler.post(new Runnable() {
             @Override
             public void run() {
@@ -156,7 +159,7 @@ public class ImageSlide extends Slide {
       imageView.setImageDrawable(thumbnail);
       ((AnimationDrawable)imageView.getDrawable()).start();
     } else {
-      TransitionDrawable fadingResult = new TransitionDrawable(new Drawable[]{new ColorDrawable(Color.TRANSPARENT), thumbnail});
+      TransitionDrawable fadingResult = new TransitionDrawable(new Drawable[]{imageView.getDrawable(), thumbnail});
       imageView.setImageDrawable(fadingResult);
       fadingResult.startTransition(300);
     }

src/org/thoughtcrime/securesms/mms/PartAuthority.java

@@ -10,27 +10,21 @@ import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.PartDatabase;
 import org.thoughtcrime.securesms.providers.PartProvider;
 
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 
 public class PartAuthority {
 
-  private static final String PART_URI_STRING   = "content://org.thoughtcrime.securesms/part";
-  private static final String THUMB_URI_STRING  = "content://org.thoughtcrime.securesms/thumb";
-
-  public  static final Uri    PART_CONTENT_URI  = Uri.parse(PART_URI_STRING);
-  public  static final Uri    THUMB_CONTENT_URI = Uri.parse(THUMB_URI_STRING);
+  private static final String PART_URI_STRING  = "content://org.thoughtcrime.securesms/part";
+  public  static final Uri    PART_CONTENT_URI = Uri.parse(PART_URI_STRING);
 
   private static final int PART_ROW  = 1;
-  private static final int THUMB_ROW = 2;
 
   private static final UriMatcher uriMatcher;
 
   static {
     uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
     uriMatcher.addURI("org.thoughtcrime.securesms", "part/#", PART_ROW);
-    uriMatcher.addURI("org.thoughtcrime.securesms", "thumb/#", THUMB_ROW);
   }
 
   public static InputStream getPartStream(Context context, MasterSecret masterSecret, Uri uri)
@@ -42,7 +36,6 @@ public class PartAuthority {
     try {
       switch (match) {
       case PART_ROW:  return partDatabase.getPartStream(masterSecret, ContentUris.parseId(uri));
-      case THUMB_ROW: return partDatabase.getThumbnailStream(masterSecret, ContentUris.parseId(uri));
       default:        return context.getContentResolver().openInputStream(uri);
       }
     } catch (SecurityException se) {

src/org/thoughtcrime/securesms/mms/Slide.java

@@ -39,7 +39,7 @@ public abstract class Slide {
   protected final PduPart      part;
   protected final Context      context;
   protected       MasterSecret masterSecret;
-	
+
   public Slide(Context context, PduPart part) {
     this.part    = part;
     this.context = context;
@@ -78,6 +78,10 @@ public abstract class Slide {
     imageView.setImageDrawable(getThumbnail(imageView.getWidth(), imageView.getHeight()));
   }
 
+  public void setThumbnailOn(ImageView imageView, int height, int width, Drawable placeholder) {
+    imageView.setImageDrawable(getThumbnail(width, height));
+  }
+
   public Bitmap getGeneratedThumbnail() { return null; }
 
   public boolean hasImage() {

src/org/thoughtcrime/securesms/mms/SlideDeck.java

@@ -20,7 +20,9 @@ import android.content.Context;
 
 import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.dom.smil.parser.SmilXmlSerializer;
+import org.thoughtcrime.securesms.util.MediaUtil;
 import org.thoughtcrime.securesms.util.SmilUtil;
+import org.thoughtcrime.securesms.util.Util;
 
 import java.io.ByteArrayOutputStream;
 import java.io.UnsupportedEncodingException;
@@ -41,20 +43,10 @@ public class SlideDeck {
   }
 
   public SlideDeck(Context context, MasterSecret masterSecret, PduBody body) {
-    try {
-      for (int i=0;i<body.getPartsNum();i++) {
-        String contentType = new String(body.getPart(i).getContentType(), CharacterSets.MIMENAME_ISO_8859_1);
-        if (ContentType.isImageType(contentType))
-          slides.add(new ImageSlide(context, masterSecret, body.getPart(i)));
-        else if (ContentType.isVideoType(contentType))
-          slides.add(new VideoSlide(context, body.getPart(i)));
-        else if (ContentType.isAudioType(contentType))
-          slides.add(new AudioSlide(context, body.getPart(i)));
-        else if (ContentType.isTextType(contentType))
-          slides.add(new TextSlide(context, masterSecret, body.getPart(i)));
-      }
-    } catch (UnsupportedEncodingException uee) {
-      throw new AssertionError(uee);
+    for (int i=0;i<body.getPartsNum();i++) {
+      String contentType = Util.toIsoString(body.getPart(i).getContentType());
+      Slide  slide       = MediaUtil.getSlideForPart(context, masterSecret, body.getPart(i), contentType);
+      if (slide != null) slides.add(slide);
     }
   }
 

src/org/thoughtcrime/securesms/mms/VideoSlide.java

@@ -19,6 +19,7 @@ package org.thoughtcrime.securesms.mms;
 import java.io.IOException;
 
 import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.util.SmilUtil;
 import org.w3c.dom.smil.SMILDocument;
 import org.w3c.dom.smil.SMILMediaElement;
@@ -35,14 +36,14 @@ import android.util.Log;
 
 public class VideoSlide extends Slide {
 
-  public VideoSlide(Context context, PduPart part) {
-    super(context, part);
-  }
-
   public VideoSlide(Context context, Uri uri) throws IOException, MediaTooLargeException {
     super(context, constructPartFromUri(context, uri));
   }
 
+  public VideoSlide(Context context, MasterSecret masterSecret, PduPart part) {
+    super(context, masterSecret, part);
+  }
+
   @Override
   public Drawable getThumbnail(int width, int height) {
     return context.getResources().getDrawable(R.drawable.ic_launcher_video_player);

src/org/thoughtcrime/securesms/util/MediaUtil.java

@@ -9,8 +9,13 @@ import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.crypto.MasterSecret;
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.PartDatabase;
+import org.thoughtcrime.securesms.mms.AudioSlide;
+import org.thoughtcrime.securesms.mms.ImageSlide;
 import org.thoughtcrime.securesms.mms.MediaConstraints;
+import org.thoughtcrime.securesms.mms.MediaTooLargeException;
 import org.thoughtcrime.securesms.mms.PartAuthority;
+import org.thoughtcrime.securesms.mms.Slide;
+import org.thoughtcrime.securesms.mms.VideoSlide;
 import org.thoughtcrime.securesms.transport.UndeliverableMessageException;
 
 import java.io.ByteArrayInputStream;
@@ -62,6 +67,19 @@ public class MediaUtil {
     return BitmapUtil.createScaledBitmap(context, masterSecret, uri, maxSize, maxSize);
   }
 
+  public static Slide getSlideForPart(Context context, MasterSecret masterSecret, PduPart part, String contentType) {
+    Slide slide = null;
+    if (ContentType.isImageType(contentType)) {
+      slide = new ImageSlide(context, masterSecret, part);
+    } else if (ContentType.isVideoType(contentType)) {
+      slide = new VideoSlide(context, masterSecret, part);
+    } else if (ContentType.isAudioType(contentType)) {
+      slide = new AudioSlide(context, masterSecret, part);
+    }
+
+    return slide;
+  }
+
   public static boolean isImage(PduPart part) {
     return ContentType.isImageType(Util.toIsoString(part.getContentType()));
   }