//发送辅助模式事件，给自动化测试调用
AccessibilityEvent event = AccessibilityEvent.obtain(AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED);
event.getText().add(mToast.mTextView.getText().toString());
mToast.mView.onPopulateAccessibilityEvent(event); //修改event
mToast.mView.sendAccessibilityEventUnchecked(event);//发送event