null checks and try with resources

app/src/main/java/awais/instagrabber/managers/InboxManager.java

@@ -198,7 +198,7 @@ public final class InboxManager {
             hasOlder = false;
             return;
         }
-        if (!response.getStatus().equals("ok")) {
+        if (!Objects.equals(response.getStatus(), "ok")) {
             Log.e(TAG, "DM inbox fetch response: status not ok");
             inbox.postValue(Resource.error(R.string.generic_not_ok_response, getCurrentDirectInbox()));
             hasOlder = false;
@@ -209,12 +209,13 @@ public final class InboxManager {
             viewer = response.getViewer();
         }
         final DirectInbox inbox = response.getInbox();
+        if (inbox == null) return;
         if (!TextUtils.isEmpty(cursor)) {
             final DirectInbox currentDirectInbox = getCurrentDirectInbox();
             if (currentDirectInbox != null) {
                 List<DirectThread> threads = currentDirectInbox.getThreads();
                 threads = threads == null ? new LinkedList<>() : new LinkedList<>(threads);
-                threads.addAll(inbox.getThreads());
+                threads.addAll(inbox.getThreads() == null ? Collections.emptyList() : inbox.getThreads());
                 inbox.setThreads(threads);
             }
         }

app/src/main/java/awais/instagrabber/managers/ThreadManager.java

@@ -16,7 +16,6 @@ import com.google.common.collect.Iterables;
 import org.json.JSONObject;
 
 import java.io.File;
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.util.ArrayList;
@@ -1008,7 +1007,7 @@ public final class ThreadManager {
                 return;
             }
             sendPhoto(data, uri, dimensions.first, dimensions.second);
-        } catch (FileNotFoundException e) {
+        } catch (IOException e) {
             data.postValue(Resource.error(e.getMessage(), null));
             Log.e(TAG, "sendPhoto: ", e);
         }

app/src/main/java/awais/instagrabber/utils/BitmapUtils.java

@@ -17,7 +17,6 @@ import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 
 import java.io.File;
-import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -243,13 +242,15 @@ public final class BitmapUtils {
      * @return dimensions of the image
      */
     public static Pair<Integer, Integer> decodeDimensions(@NonNull final ContentResolver contentResolver,
-                                                          @NonNull final Uri uri) throws FileNotFoundException {
+                                                          @NonNull final Uri uri) throws IOException {
         BitmapFactory.Options options = new BitmapFactory.Options();
         options.inJustDecodeBounds = true;
-        BitmapFactory.decodeStream(contentResolver.openInputStream(uri), null, options);
-        return (options.outWidth == -1 || options.outHeight == -1)
-               ? null
-               : new Pair<>(options.outWidth, options.outHeight);
+        try (final InputStream stream = contentResolver.openInputStream(uri)) {
+            BitmapFactory.decodeStream(stream, null, options);
+            return (options.outWidth == -1 || options.outHeight == -1)
+                   ? null
+                   : new Pair<>(options.outWidth, options.outHeight);
+        }
     }
 
     public static File convertToJpegAndSaveToFile(@NonNull final Bitmap bitmap, @Nullable final File file) throws IOException {