[英]Handle Fragments from ViewPager when orientation changes
I have been tring since this morning to handle screen rotation with the viewpager, i tried a lot of things i read almost every post here about this and i was unable to find my issue.从今天早上开始,我一直在尝试使用 viewpager 处理屏幕旋转,我尝试了很多东西,我阅读了几乎所有关于此的帖子,但我无法找到我的问题。
Issues问题
I read in one of the post that this is due the fragment being distroyed when orientation changes and that we need to use setRetainInstance(true);我在其中一篇文章中读到这是由于方向改变时片段被破坏,我们需要使用 setRetainInstance(true); inside on create to fix this but it's not working, am i missing something here?
在创建内部来解决这个问题,但它不起作用,我在这里遗漏了什么吗?
public class SectionsPagerAdapter extends FragmentStatePagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
if (position <= (arraySize - 1)) {
HashMap<String, String> data = computeQuestion(questoes[randomize.get(position)]);
return PlaceholderFragment.newInstance(position + 1, data, tables[randomize.get(position)]);
} else {
return FragmentResultados.newInstance(position + 1);
}
}
@Override
public int getCount() {
return arraySize + 1; // number of pages + ending page
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
default:
return String.valueOf(position);
}
}
}
Fragment分段
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
EDIT编辑
Fragment分段
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_exame, container, false);
mViewPager = (ViewPager) getActivity().findViewById(R.id.container);
mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());
mViewPager.setAdapter(mSectionsPagerAdapter);
return rootView;
}
Result: IllegalStateException: FragmentManager is already executing transactions结果:IllegalStateException:FragmentManager 已经在执行事务
Activity活动
private static ViewPager mViewPager;
private static FragmentStatePagerAdapter mSectionsPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_exame2);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
Manifest显现
<activity
android:name=".Exame"
android:label="@string/title_activity_exame"
android:theme="@style/AppTheme"
android:configChanges="keyboardHidden|orientation|screenSize"/>
activity_xml活动_xml
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="pt.condutorresponsavel.android.testescodigo.Exame">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<ImageView
android:id="@+id/arrowLeft"
android:background="@color/colorPrimary"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_first_page_white_24dp"
android:paddingLeft="10dp"
android:paddingTop="3dp"
android:paddingRight="10dp"
android:paddingBottom="3dp"
android:onClick="toFirst"
/>
<ImageView
android:background="@color/colorPrimary"
android:onClick="toLast"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_last_page_white_24dp"
android:paddingLeft="10dp"
android:paddingTop="3dp"
android:paddingRight="10dp"
android:paddingBottom="3dp"
android:layout_alignParentRight="true"
android:id="@+id/arrowRight" />
<TextView
android:id="@+id/timeleft"
android:textColor="#ffffff"
android:background="@color/colorPrimary"
android:paddingRight="10dp"
android:paddingLeft="5dp"
android:gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="20:01"
android:layout_alignBottom="@+id/arrowRight"
android:layout_toLeftOf="@+id/arrowRight"
android:layout_toStartOf="@+id/arrowRight"
android:layout_alignParentTop="true" />
i uploaded a sample o the code to github我将代码示例上传到github
FIXED固定的
private void InitializeUI(){
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.activity_exame2);
InitializeUI();
}
Do you use android support library?你使用android支持库吗? This may be an issue.
这可能是一个问题。 Also look at similar problem here: ViewPager fragments disappear when change screen rotation
还可以在这里查看类似的问题: ViewPager Fragments 当更改屏幕旋转时消失
If your fragment pages dissapear then it will work:-如果您的片段页面消失,那么它将起作用:-
Override getItemId(int position) method in your ViewPagerAdapter class like below:在 ViewPagerAdapter 类中覆盖 getItemId(int position) 方法,如下所示:
@Override
public long getItemId(int position) {
return System.currentTimeMillis();
}
I was missing android:configChanges="orientation|screenSize"
in the manifest file.我在清单文件中缺少
android:configChanges="orientation|screenSize"
。 Eg:例如:
<activity
android:name=".MyActivity"
android:configChanges="orientation|screenSize" />
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