Add own constant for maximum group invitation message length

briar-android/src/org/briarproject/android/privategroup/creation/CreateGroupActivity.java

@@ -25,7 +25,7 @@ import javax.inject.Inject;
 
 import static android.support.v4.app.ActivityOptionsCompat.makeCustomAnimation;
 import static android.widget.Toast.LENGTH_SHORT;
-import static org.briarproject.api.privategroup.PrivateGroupConstants.MAX_GROUP_POST_BODY_LENGTH;
+import static org.briarproject.api.privategroup.PrivateGroupConstants.MAX_GROUP_INVITATION_MSG_LENGTH;
 
 public class CreateGroupActivity extends ContactSelectorActivity implements
 		CreateGroupListener, MessageFragmentListener {
@@ -148,7 +148,7 @@ public class CreateGroupActivity extends ContactSelectorActivity implements
 
 	@Override
 	public int getMaximumMessageLength() {
-		return MAX_GROUP_POST_BODY_LENGTH;
+		return MAX_GROUP_INVITATION_MSG_LENGTH;
 	}
 
 	private void openNewGroup() {

briar-api/src/org/briarproject/api/privategroup/PrivateGroupConstants.java

@@ -19,4 +19,9 @@ public interface PrivateGroupConstants {
 	 */
 	int MAX_GROUP_POST_BODY_LENGTH = MAX_MESSAGE_BODY_LENGTH - 1024;
 
+	/**
+	 * The maximum length of a group invitation message in bytes.
+	 */
+	int MAX_GROUP_INVITATION_MSG_LENGTH = MAX_MESSAGE_BODY_LENGTH - 1024;
+
 }