片段，DialogFragment，以及屏幕旋转 [英] Fragments, DialogFragment, and Screen Rotation

问题描述

我有一个活动，叫的setContentView与该XML：

I have an Activity that calls setContentView with this XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    >
    <fragment android:name="org.vt.indiatab.GroupFragment"
        android:id="@+id/home_groups"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1" />
            <..some other fragments ...>
</LinearLayout>

在GroupFragment延伸片段，一切都很好那里。不过，我将展示从内GroupFragment一个DialogFragment。这正确地显示，但是当屏幕旋转时，我得到一个强制关闭。

The GroupFragment extends Fragment, and all is well there. However, I show a DialogFragment from within GroupFragment. This shows correctly, HOWEVER when the screen rotates, I get a Force Close.

什么是正确的方法来从另一个片段，DialogFragment.show（FragmentManager，字符串）？

What's the proper way to display a DialogFragment from within another Fragment other than DialogFragment.show(FragmentManager, String)?

推荐答案

确定，而Zsombor的方法的工作，这是由于我是没有经验与片段和他的解决方案，使得与 saveInstanceState捆绑。

OK, while Zsombor's method works, this is due to me being inexperienced with Fragments and his solution causes issues with the saveInstanceState Bundle.

显然，（至少在DialogFragment），它应该是一个公共静态类。您还必须编写自己的静态DialogFragment的newInstance（）方法。这是因为碎片类调用它的实例化的newInstance 办法（）方法。

Apparently (at least for a DialogFragment), it should be a public static class. You also MUST write your own static DialogFragment newInstance() method. This is because the Fragment class calls the newInstance method in its instantiate() method.

所以在最后，你必须编写DialogFragments像这样：

So in conclusion, you MUST write your DialogFragments like so:

public static class MyDialogFragment extends DialogFragment {

    static MyDialogFragment newInstance() {
        MyDialogFragment d = new MyDialogFragment();
        return d;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        ...
    }
}

和展示他们：

private void showMyDialog() {
    MyDialogFragment d = MyDialogFragment.newInstance();
    d.show(getFragmentManager(), "dialog");
}

这可能是唯一的ActionBarSherlock库，但在SDK文档使用的官样这种模式也。

This may be unique to the ActionBarSherlock Library, but the official samples in the SDK documentation use this paradigm also.

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