ListView 在设备切换横竖屏时保存状态

比如listview在设备切换横竖屏时，仍然需要保证position，

activity - > onSaveInstanceState  - > restoreInstanceState

view  - > onSaveInstanceState  - > restoreInstanceState

// YourActivity.java

private static final String LIST_STATE = "listState";

private Parcelable mListState = null;

// Write list state to bundle

@Override

protected void onSaveInstanceState(Bundle state) {

    super.onSaveInstanceState(state);

    mListState = getListView().onSaveInstanceState();

    state.putParcelable(LIST_STATE, mListState);

}

// Restore list state from bundle

@Override

protected void onRestoreInstanceState(Bundle state) {

    super.onRestoreInstanceState(state);

    mListState = state.getParcelable(LIST_STATE);

}

@Override

protected void onResume() {

    super.onResume();

    loadData(); // 确保数据重新加载，并在daapter中刷新

    // 在api call 的success 的回调中restoreState

    if (mListState != null) {

        myListView.onRestoreInstanceState(mListState);

        mListState = null;

    }

}