Avoid non-UI thread view touching on some devices

app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryCommentsScene.java

@@ -27,6 +27,7 @@ import android.content.res.Resources;
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
+import android.os.Looper;
 import android.os.Parcelable;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
@@ -505,6 +506,13 @@ public final class GalleryCommentsScene extends ToolbarScene
                     return;
                 }
 
+                if (Looper.myLooper() != Looper.getMainLooper()) {
+                    // Some devices may run this block in non-UI thread.
+                    // It might be a bug of Android OS.
+                    // Check it here to avoid crash.
+                    return;
+                }
+
                 mEditPanel.setVisibility(View.GONE);
                 ((View) mFab).setVisibility(View.VISIBLE);
                 int fabStartX = mEditPanel.getLeft() + (mEditPanel.getWidth() / 2) - (mFab.getWidth() / 2);