我有一个带书的ListView。当我单击该行时，我可以看到新片段中的书籍详细信息，类似于Training Android中的内容。我想滑动书籍（从列表中向右->下一个元素，向左
问题
如何将ViewPager与片段整合在一起？当我单击列表上的元素时，将调用FragmentTransaction。
活动：
public class MyActivity extends FragmentActivity implements RecyclerViewFragment.OnFragmentInteractionListener {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
final Fragment mFragment = new RecyclerViewFragment();
if (savedInstanceState == null) {
getSupportFragmentManager()
.beginTransaction()
.add(R.id.container, mFragment)
.commit();
}
}
@Override
public void onFragmentInteraction(int id) {
Log.d("Element Id ", String.valueOf(id));
PagerViewFragment newFragment = new PagerViewFragment();
Bundle args = new Bundle();
args.putInt(PagerViewFragment.ARG_POSITION, id);
newFragment.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
transaction.replace(R.id.container, newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
如何告知应该改变观点的片段？
我应该使用此代码吗？
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
编辑
在ILovemyPancho之后再次回答堆栈。 java.lang.NullPointerException：
PagerViewFragment：
public class PagerViewFragment extends Fragment {
final static String ARG_POSITION = "position";
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
public PagerViewFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
ViewGroup viewRoot = (ViewGroup) inflater.inflate(R.layout.pager_fragment, container, false);
mPager = (ViewPager) container.findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager());
mPager.setAdapter(mPagerAdapter); //line 39. Error is here
return viewRoot;
}
@Override
public void onStart() {
super.onStart();
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
PagerViewFragment frag = new PagerViewFragment();
Bundle args = new Bundle();
args.putString("BookTitle", "FD");
DummyContent dummyContent = new DummyContent(); //elements
TextView street = (TextView) getView().findViewById(R.id.street_article);
street.setText(dummyContent.murals.get(position).getStreet());
TextView artist = (TextView) getView().findViewById(R.id.artist_article);
artist.setText(dummyContent.murals.get(position).getArtists().get(0).getName());
frag.setArguments(args);
return frag;
}
@Override
public int getCount() {
return DummyContent.murals.size();
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
}
我的活动：
public class MyActivity extends FragmentActivity implements RecyclerViewFragment.OnFragmentInteractionListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
final Fragment mFragment = new RecyclerViewFragment();
if (savedInstanceState == null) {
getSupportFragmentManager()
.beginTransaction()
.add(R.id.container, mFragment)
.commit();
}
}
@Override
public void onFragmentInteraction(int id) {
Log.d("Element Id ", String.valueOf(id));
PagerViewFragment newFragment = new PagerViewFragment();
Bundle args = new Bundle();
args.putInt(PagerViewFragment.ARG_POSITION, id);
newFragment.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
transaction.replace(R.id.container, newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
}
activity_screen_slide.xml
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
pager_fragmet.xml
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/blank_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.szymon.fragmentexample.BlankFragment">
<TextView
android:id="@+id/street_article"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="50dp"
android:layout_marginTop="50dp"
android:text="hello_blank_fragment"
android:textSize="23dp" />
<TextView
android:id="@+id/artist_article"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/street_article"
android:layout_marginLeft="50dp"
android:layout_marginTop="10dp"
android:text="hello_blank_fragment"
android:textSize="15dp" />
<TextView
android:id="@+id/picture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/artist_article"
android:layout_marginLeft="50dp"
android:layout_marginTop="100dp"
android:text="here will be the picture"
android:textSize="15dp" />
</RelativeLayout>
</ScrollView>
我收到一个错误：
java.lang.NullPointerException
在com.example.szymon.recyclerview.PagerViewFragment.onCreateView（PagerViewFragment.java:39）
在android.support.v4.app.Fragment.performCreateView（Fragment.java:1504）
最佳答案
好的，所以您有一个活动正在布置ListFragment（RecyclerViewFragment）。当您单击列表项时，ListFragment将替换为PagerViewFragment，显示该书的详细信息。
尝试这个。创建一个包含ViewPager的片段。单击某个项目时，此片段将替换您的ListFragment。让我们称之为BookDetailsContainer，它将接收列表项ID：
BookDetailsContainer newFragment = BookDetailsContainer.newInstance(id);
在此片段内，您设置了viewpager：
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager());
mPager.setAdapter(mPagerAdapter);
ViewPager需要
getChildFragmentManager()来处理嵌套的片段（BookDetailsContainer中的PagerViewFragment）。并且由于将列表位置ID传递给BookDetailsContainer，因此可以设置位置：mPager.setCurrentItem(positionId);
在您的
ScreenSlidePagerAdapter中，您将创建一个PagerViewFragment实例，根据以下信息从数据源（数组，游标...）获取要显示的信息
位置，使用Bundle将数据传递给片段，然后返回片段：
@Override
public Fragment getItem(int position) {
PagerViewFragment frag = new PagerViewFragment();
Bundle args = new Bundle();
//get data from your data source based on the "position"
args.putString("BookTitle", ...);
args.putString("BookAuthor", ...);
...
frag.setArguments(args);
return frag;
}
这基本上就是您可以做到的。