单击后退按钮时如何确定recyclerview的确切位置

Question

There is a list of items in an activity, when I click any activity, it gets into the detailed activity. When back button is clicked from the detailed activity it goes to the top of the list. I want it to go to the previous scroll position.

this is the onBackPressed() of the detailed activity

@Override
public void onBackPressed()
{
    Intent intent = new Intent(this,MainActivity.class);
    intent.putExtra("index",NAV_INDEX_MY_GROUPS);
    intent.putExtra("tag",TAG_MY_GROUPS);
    startActivity(intent);
    finish();
}

how to intent back to the previous scroll position of the list activity

Answer 1

将数据绑定到recyclerview后，使用以下代码

mRecyclerView.smoothScrollToPosition("your_index");

Answer 2

If the MainActivity is already on your back stack, then you don't want to use startActivity to start a second copy of it. The default onBackPressed() is enough to go back to the previous activity already.