问题
I wrote an activity which contains a navigation drawer (a simple fragment with a ListView inside), and a model and an adapter for the ListView. There is an ImageView and a TextView in a single list item, as it's usually be in many apps. That's all I have done, and the rest codes of the activity and fragment's classes were all generated automatically by Android Studio. Then when I used Toast.makeText in the activity, the result looks as this.
I've searched for this question and tried using Toast.makeText(this.getApplicationContext(), ...) instead of Toast.makeText(this, ...), and it worked. I'm wondering why would this happen and how should I solved this problem correctly?
回答1:
In the official documentation it says that a typical Toast looks like this:
Context context = getApplicationContext();
Toast toast = Toast.makeText(context, text, duration);
I imagine it is because depending on the class you have, the context varies because not all context instances are created equal.
More info also here:
来源：https://stackoverflow.com/questions/24475333/why-is-the-width-of-toast-shorter-than-its-content