错误：can‘t toast on a thread that has not called looper.prepare()
https://stackoverflow.com/questions/3875184/cant-create-handler-inside-thread-that-has-not-called-looper-prepare
1 activity.runOnUiThread(new Runnable() { 2 public void run() { 3 Toast.makeText(activity, "Hello", Toast.LENGTH_SHORT).show(); 4 } 5 });
【Android】Toast on non-UI thread
原文：https://www.cnblogs.com/imoon22/p/14404221.html