片段恢复对定向状态改变片段、状态
我要实现我的应用程序非标准的片段导航（请参阅链接）。
I have to implement "standart" fragments navigation in my app (please see link).
的问题是当设备处于纵向模式，有应显示仅1片段，并且当其转动到横向模式，2片段应该显示。
The issue is when device is in portrait mode, there should be shown only 1 fragment, and when it is rotated to landscape mode, 2 fragments should be shown.
我试着做这两种不同的方式：
I tried to do this 2 different ways:
1）我用不同横向和纵向布局，只有1活动。
纵向布局的xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout
android:id="@+id/main_frame_fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
和here`s景观布置：
And here`s landscape layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false"
android:orientation="horizontal" >
<FrameLayout
android:id="@+id/main_frame_fragment_container_left"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<FrameLayout
android:id="@+id/main_frame_fragment_container_right"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>
Activity`s的的onCreate 的方法：
private static ItemsFragment mItemsFragment;
private static ItemDetailsFragment mItemDetailsFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (mItemsFragment == null) {
mItemsFragment = ItemsFragment.newInstance();
}
if (mItemDetailsFragment == null) {
mItemDetailsFragment = ItemDetailsFragment.newInstance();
}
if (isLandscape()) {
getSupportFragmentManager().beginTransaction().replace(R.id.main_frame_fragment_container_left, mItemsFragment)
.commit();
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_frame_fragment_container_right, mItemDetailsFragment).commit();
} else {
getSupportFragmentManager().beginTransaction().replace(R.id.main_frame_fragment_container, mItemsFragment)
.commit();
}
}
和that`s的方式我刷新第二片段：
And that`s the way I refresh 2nd fragment:
Bundle bundle = new Bundle();
bundle.putSerializable(BaseFragment.KEY_BUNDLE_ITEM, response.getItem());
mItemDetailsFragment = ItemDetailsFragment.newInstance(bundle);
if (isLandscape()) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_frame_fragment_container_right, mItemDetailsFragment).commit();
} else {
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_frame_fragment_container, mItemDetailsFragment).addToBackStack(null).commit();
}
此外，我保存和恢复fragments`状态，所以旋转后，我的数据不会消失。一般来说，这个code正常工作，在我的情况。
Also I save and restore fragments` states, so my data does not disappear after rotations. Generally, this code works properly in my case.
2）我用2活动，并为活动一日纵向和横向模式相同的布局。
XML布局是一样的previous一个景观：
xml layout is the same as in previous one for landscape:
<FrameLayout
android:id="@+id/main_frame_fragment_container_left"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<FrameLayout
android:id="@+id/main_frame_fragment_container_right"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>
的的onCreate 的方法（注意，该片段实体不是静态的，因为它是在第一种情况）：私人ItemsFragment mItemsFragment; 私人ItemDetailsFragment mItemDetailsFragment;
onCreate method (note, that fragments entities are not static, as it was in 1st case): private ItemsFragment mItemsFragment; private ItemDetailsFragment mItemDetailsFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
mItemsFragment = ItemsFragment.newInstance();
mItemDetailsFragment = ItemDetailsFragment.newInstance();
getSupportFragmentManager().beginTransaction().replace(R.id.main_frame_fragment_container_left, mItemsFragment)
.commit();
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_frame_fragment_container_right, mItemDetailsFragment).commit();
}
}
现在，如果该设备处于纵向模式时，我开始新的活动：
And now if the device is in portrait mode, I start new Activity:
if (isLandscape()) {
Bundle bundle = new Bundle();
bundle.putSerializable(BaseFragment.KEY_BUNDLE_ITEM, response.getItem());
mItemDetailsFragment = ItemDetailsFragment.newInstance(bundle);
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_frame_fragment_container_right, mItemDetailsFragment).commit();
} else {
Intent intent = new Intent(getApplicationContext(), DetailsActivity.class);
intent.putExtra(KEY_ITEM, response.getItem());
startActivity(intent);
}
和，最后，第2 Activity`s的的onCreate 的方法：
And, at last, 2nd Activity`s onCreate method:
protected void onCreate(Bundle arg0) {
super.onCreate(arg0);
setContentView(R.layout.activity_details);
if (isLandscape()) {
finish();
}
Item item = (Item) getIntent().getExtras().getSerializable(KEY_ITEM);
Bundle bundle = new Bundle();
bundle.putSerializable(BaseFragment.KEY_BUNDLE_ITEM, item);
ItemDetailsFragment mItemDetailsFragment = ItemDetailsFragment.newInstance(bundle);
getSupportFragmentManager().beginTransaction()
.replace(R.id.main_frame_fragment_container, mItemDetailsFragment).commit();
}
当设备旋转为横向模式，第二活动结束后，我看到我的2片段（如预期）1日的活动。
When device is rotated to landscape mode, 2nd activity finishes, and I see my 1st activity with 2 fragments (as expected).
问：
在第一种情况我片段保存为静态变量，也正因为如此，如果我改变纵向或横向模式的第二个片段的状态我不在乎（相同的片段时）。但我不认为这是一个好主意，将其保存为静态字段。
In 1st case I save fragments as static variables, and because of this I don't care if I change 2nd fragment state in portrait or landscape modes (the same fragment is used). But I don't think it's a good idea to save it as static fields.
在第二个情况下，我不知道如何同步活性的片段B（横向）与活动B片段B（人像）。如果我改变片段的东西（我的意思是，切换按钮等）和旋转装置，改变应该在另一个片段被应用。
In 2nd case I don't know how to sync Activity A Fragment B (landscape) and Activity B Fragment B (portrait). If I change something in fragment (I mean, toggle button etc) and rotate device, changes should be applied in another fragment.
一般情况下，什么情况下是较好的，如果2，我怎么能解决同步问题？或者，也许还有另一种更简单的方法。感谢您的阅读，我希望你能帮助我:)
Generally, what case is better, and if 2nd, how can I resolve synchronization issue? Or maybe there is another easier way. Thanks for reading, I hope you can help me :)
推荐答案
只要按照这个队友 http://developer.android.com/guide/components/fragments.html 。不要使碎片静态的（那只是奇怪）
Just follow this mate http://developer.android.com/guide/components/fragments.html. Dont make fragments static (thats just wierd)
