Question

我有3项活动： A - ＆gt; B - ＆gt; ç

在活动B中，我使用RecyclerView的GridlayoutManager进行填充。我想在导航到活动C时保存滚动状态，并在从活动C返回活动B时恢复滚动状态。

private RecyclerView mImgList;
private GridLayoutManager mRecyclerGridMan;
private final String KEY_RECYCLER_STATE = "recycler_state";
private Parcelable mListState = null;
private static Bundle mBundleRecyclerViewState;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
protected void onPause()
{
    super.onPause();
    mBundleRecyclerViewState = new Bundle();
    mListState = mImgList.getLayoutManager().onSaveInstanceState();
    mBundleRecyclerViewState.putParcelable(KEY_RECYCLER_STATE, mListState);
}

@Override
protected void onResume()
{
    super.onResume();
    if (mBundleRecyclerViewState != null) {
        mListState = mBundleRecyclerViewState.getParcelable(KEY_RECYCLER_STATE);
        mImgList.getLayoutManager().onRestoreInstanceState(mListState);
    }
}

但是当我按下活动B的后退按钮并转到活动A，并从活动A导航回活动B时，这种方法有效。

Answer 1

恢复onRestoreInstanceState（）

中的状态

k = reverse_d[30]
# k = '2'

Android：RecyclerView GridLayoutManager - 恢复滚动位置无法正常工作

1 个答案: