我试图在我的唯一片段中添加一个ViewPager（带有pagertabstrip），但是我搞砸了。在我的第二个活动中，带有viewpager的片段是通过onclicklistener触发的，但是当我单击时，什么也没有发生，片段根本无法打开，并且应用程序在几秒钟后崩溃。我已经将FragmentStatePagerAdapter配置为可与viewpager一起使用。
以下代码按此顺序排列：带有onClicklisterner> Fragment.java> Fragment.xml的配方活动。任何帮助将不胜感激。
//Onclicklistener to open Fragment
public class recipe_detail extends AppCompatActivity {
ImageView mBakingGif;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipe_detail);
// clicklistener to open fragment
mBakingGif.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.frag_container, new VideoFragment());
ft.commit();
}
});
}
}
//Fragment class and Inner Adapter
public class VideoFragment extends Fragment {
private String mRecipeIntro;
private String mPageTitle;
private int position;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.video_fragment, container, false);
}
// Any view setup should occur here. E.g., view lookups and attaching view listeners.
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
//Instantiate Cake object
CakesItem cakesItem = Objects.requireNonNull(getActivity()).getIntent().getParcelableExtra("cake");
//Create ArrayList to store number of steps in json file (not sure here!)
final List<VideoFragment> tabs = new ArrayList<>();
//get size of array to iterate through
int tabsNo = cakesItem.getmSteps().size();
for (int i = 0; i < tabsNo; i++) {
VideoFragment videoFragment = new VideoFragment();
Bundle bundle = new Bundle();
videoFragment.setArguments(bundle);
tabs.add(videoFragment);
}
//Setup for the Fragment ViewPager and FragmentStatePagerAdapter
ViewPager vpPager = view.findViewById(R.id.vpPager);
MyPagerAdapter adapter = new MyPagerAdapter(getChildFragmentManager(), tabs, mRecipeIntro, mPageTitle);
vpPager.setAdapter(adapter);
//end
}
//State pager adapter as Inner class.
public static class MyPagerAdapter extends FragmentStatePagerAdapter {
private final List<VideoFragment> tabs;
private final String recipeIntro;
private final String pageTitle;
MyPagerAdapter(@NonNull FragmentManager fm, List<VideoFragment> tabs, String recipeIntro, String pageTitle) {
super(fm);
this.tabs = tabs;
this.recipeIntro = recipeIntro;
this.pageTitle = pageTitle;
}
@NonNull
@Override
public Fragment getItem(int position) {
return tabs.get(position);
}
@Override
public int getCount() {
return tabs.size();
}
@Override
public CharSequence getPageTitle(int position) {
if (position == 0) {
return recipeIntro;
} else {
return pageTitle + position;
}
}
}
}
<!-- Layout for fragment-->
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/exo_content_frame"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:background="@android:color/darker_gray"
android:orientation="vertical">
<TextView
android:id="@+id/tvLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.v7.widget.RecyclerView
android:id="@+id/frag_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.google.android.exoplayer2.ui.PlayerView
android:id="@+id/player_view"
android:layout_width="match_parent"
android:layout_height="255dp" />
<TextView
android:id="@+id/short_description_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/player_view"
android:layout_marginTop="20dp"
android:textSize="20sp"
android:textStyle="bold"
tools:text="Recipe introduction" />
<TextView
android:id="@+id/description_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/short_description_tv"
android:layout_marginTop="20dp"
android:textSize="18sp"
tools:text="Recipe introduction" />
<Button
android:id="@+id/previous_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Prev" />
<Button
android:id="@+id/next_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:text="Next" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="@+id/vpPager"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.view.PagerTabStrip
android:id="@+id/pager_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:paddingTop="4dp"
android:paddingBottom="4dp" />
</android.support.v4.view.ViewPager>
</LinearLayout>
</RelativeLayout>