在方向改变时保持片段的状态，但替换其布局

Question

我试过configChanges，但显然它没有改变我的布局。我试着在onConfigurationChanged的FrameLayout容器中填充肖像和景观布局并替换它们，但似乎也不起作用。

如何处理需要加载不同布局同时保持片段状态不变的情况？这有可能吗？对于这种事情，正确的做法是什么？

Answer 1

我有这样的情况，通过setLayout方法在改变屏幕方向上加载不同的布局；

public class SampleFragment extends Fragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    mRoot = inflater.inflate(R.layout.fragment_layout, null);
    return mRoot;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    this.init();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    this.setLayout();
}

private void init() {
    this.setLayout();
}

private void setLayout() {
    View view = null;
    int orientation = mResources.getConfiguration().orientation;
    if (orientation == Configuration.ORIENTATION_LANDSCAPE)
        view = mInflater.inflate(R.layout.segment_dettaglio_evento_land, null);
    else if (orientation == Configuration.ORIENTATION_PORTRAIT)
        view = mInflater.inflate(R.layout.segment_dettaglio_evento, null);

    if (orientation == Configuration.ORIENTATION_LANDSCAPE || orientation == Configuration.ORIENTATION_PORTRAIT) {
        ViewGroup viewGroup = (ViewGroup) mRoot.findViewById(R.id.dettaglio_evento_root);
        viewGroup.removeAllViews();
        viewGroup.addView(view, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        this.initComponent();
    }
}

private void initComponent() {
 if (mResult == null)
        retrieveData();
    else
        populateWithDetail();
}

}

fragment_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/dettaglio_evento_root"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@color/dettaglio_evento_background"
  android:orientation="vertical" >
</LinearLayout>

我还有一个变量mResult，它包含从网络请求中保留的数据，所以如果它为null，我会发出请求，否则填充视图。