getActivity()是什么意思？

Question

什么getActivity()意思？我在某个地方看到,他们写的MainActivity.this.startActionMode(mActionModeCallback)不是getActivity().有人可以解释这两行是什么意思吗？

  someView.setOnLongClickListener(new View.OnLongClickListener() {
        // Called when the user long-clicks on someView
        public boolean onLongClick(View view) {
            if (mActionMode != null) {
                return false;
            }

            // Start the CAB using the ActionMode.Callback defined above
            mActionMode = getActivity().startActionMode(mActionModeCallback);
            view.setSelected(true);
            return true;
        }
    });

Answer 1

两种可能的定义:

• getActivity()在Fragment返回Activity的Fragment当前关联.(请参阅http://developer.android.com/reference/android/app/Fragment.html#getActivity()).
• getActivity() 是用户定义的.

Answer 2

getActivity()用于fragment.对于activity,无论您在何处使用this,都可以在类似情况下替换thisin .fragmentgetActivity()