片断和onConfigurationChanged

Question

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

 setContentView(R.layout.main);
}

现在我有一个展示viewpager的活动，它包含三个片段。一切运转正常。在碎片中检测旋转

public class FRG_map_web extends Fragment  {

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

        Log.i("myLogs", "Rotation");

    }

问题是片段没有使用setContentView（r.layout.main）；这是代码：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.frg.myFragment, null); 

我试着用：

LayoutInflater inflater = inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

view = inflater.inflate(R.layout.frg.myFragment, null); 

...

LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

view = inflater.inflate(R.layout.frg.myFragment, null); 

...

LayoutInflater inflater = (LayoutInflater) context.getSystemService( Context.LAYOUT_INFLATER_SERVICE );

view = inflater.inflate(R.layout.frg.myFragment, null); 

...

LayoutInflater li = LayoutInflater.from(context);

Answer 1

如果我理解正确的话，你不想让碎片在每次旋转时重新加载。相反，您希望转发视图并使用已有的信息更新它们。

public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    // Get a layout inflater (inflater from getActivity() or getSupportActivity() works as well)
    LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View newView = inflater.inflate(R.layout.frg.myFragment, null);
    // This just inflates the view but doesn't add it to any thing.
    // You need to add it to the root view of the fragment
    ViewGroup rootView = (ViewGroup) getView();
    // Remove all the existing views from the root view.
    // This is also a good place to recycle any resources you won't need anymore
    rootView.removeAllViews();
    rootView.addView(newView);
    // Viola, you have the new view setup
}

根据文档（getView（）），getView（）返回与从onCreateView（）返回的视图相同的视图，但它没有返回。它实际上返回您在onCreateView（）中返回的视图的父视图，这正是您所需要的。getView（）将返回NoSaveStateFrameLayout的一个实例，该实例专门用于片断，作为其根视图。

希望这能有所帮助。