Only show GIF metadata warning once

src/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -1894,15 +1894,21 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     case AttachmentTypeSelector.TAKE_PHOTO:
       attachmentManager.capturePhoto(this, TAKE_PHOTO); break;
     case AttachmentTypeSelector.ADD_GIF:
-      AlertDialog.Builder builder = new AlertDialog.Builder(this);
-      builder.setTitle("Search GIFs?");
-      builder.setMessage("You will not have full metadata protection when sending GIFs.");
-      builder.setPositiveButton("OK", (dialog, which) -> {
+      boolean hasSeenGIFMetaDataWarning = TextSecurePreferences.hasSeenGIFMetaDataWarning(this);
+      if (!hasSeenGIFMetaDataWarning) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle("Search GIFs?");
+        builder.setMessage("You will not have full metadata protection when sending GIFs.");
+        builder.setPositiveButton("OK", (dialog, which) -> {
+          AttachmentManager.selectGif(this, PICK_GIF, !isSecureText);
+          dialog.dismiss();
+        });
+        builder.setNegativeButton("Cancel", (dialog, which) -> dialog.dismiss());
+        builder.create().show();
+        TextSecurePreferences.setHasSeenGIFMetaDataWarning(this);
+      } else {
         AttachmentManager.selectGif(this, PICK_GIF, !isSecureText);
-        dialog.dismiss();
-      });
-      builder.setNegativeButton("Cancel", (dialog, which) -> dialog.dismiss() );
-      builder.create().show();
+      }
       break;
     }
   }

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

@@ -1305,6 +1305,14 @@ public class TextSecurePreferences {
     setLongPreference(context, "last_profile_picture_upload", newValue);
   }
 
+  public static boolean hasSeenGIFMetaDataWarning(Context context) {
+    return getBooleanPreference(context, "has_seen_gif_metadata_warning", false);
+  }
+
+  public static void setHasSeenGIFMetaDataWarning(Context context) {
+    setBooleanPreference(context, "has_seen_gif_metadata_warning", true);
+  }
+
   public static void clearAll(Context context) {
     PreferenceManager.getDefaultSharedPreferences(context).edit().clear().commit();
   }