我尝试了不同的解决方案，但是当我启动应用程序时，我收到一个布局错误，谢谢大家的帮助。
适配器：
public class Adattatore_Main extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public final int TYPE_MOVIE = 0;
public final int TYPE_LOAD = 1;
Context context;
List<Variabili_Main> movies;
OnLoadMoreListener loadMoreListener;
boolean isLoading = false, isMoreDataAvailable = true;
/*
* isLoading - to set the remote loading and complete status to fix back to back load more call
* isMoreDataAvailable - to set whether more data from server available or not.
* It will prevent useless load more request even after all the server data loaded
* */
public Adattatore_Main(Context context, List<Variabili_Main> movies) {
this.context = context;
this.movies = movies;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
if(viewType==TYPE_MOVIE){
return new MovieHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.contenitore_post, parent, false));
}else{
return new LoadHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.caricamento, parent, false));
}
}
崩溃：
LayoutInflater inflater = LayoutInflater.from(context);
主要活动：
public class Main_Post extends Fragment {
private static final int MY_PERMISSIONS_REQUEST_READ_CONTACTS = 0;
RecyclerView recyclerView;
List<Variabili_Main> movies;
Adattatore_Main adapter;
Api api;
String TAG = "MainActivity - ";
Context context;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activitymain_post, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
movies = new ArrayList<>();
adapter = new Adattatore_Main(context, movies);
adapter.setLoadMoreListener(new Adattatore_Main.OnLoadMoreListener() {
@Override
public void onLoadMore() {
recyclerView.post(new Runnable() {
@Override
public void run() {
int index = movies.size() - 1;
loadMore(index);
}
});
//Calling loadMore function in Runnable to fix the
// java.lang.IllegalStateException: Cannot call this method while RecyclerView is computing a layout or scrolling error
}
});
recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(new VerticalLineDecorator(2));
recyclerView.setLayoutManager(new LinearLayoutManager(recyclerView.getContext()));
recyclerView.setAdapter(adapter);
api = ServiceGenerator.createService(Api.class);
load(0);
return view;
}
XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical" />
</LinearLayout>
调试：
--------- beginning of crash
11-05 14:44:24.241 659-659/com.androidbelieve.drawerwithswipetabs E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.androidbelieve.drawerwithswipetabs, PID: 659
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null object reference
at android.view.LayoutInflater.from(LayoutInflater.java:232)
at com.androidbelieve.drawerwithswipetabs.Adattatore_Main.onCreateViewHolder(Adattatore_Main.java:76)
at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5464)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4689)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4599)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1988)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1384)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1347)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3003)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:2600)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1117)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:642)
at android.view.View.measure(View.java:19731)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1560)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19731)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1075)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
11-05 14:44:24.241 659-659/com.androidbelieve.drawerwithswipetabs E/AndroidRuntime: at com.android.internal.policy.DecorView.onMeasure(DecorView.java:687)
at android.view.View.measure(View.java:19731)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2271)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1358)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1607)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1246)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6301)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:619)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
--------- beginning of system
如果您需要更多代码，这是代码的一部分。谢谢。
答案 0 :(得分：0)
在获得系统布局膨胀权限之前，您需要对布局进行充气。你只需更改代码即可。其他人认为，如果您可以看到onCreateView()方法，则在初始化适配器对象时传递空上下文对象，这就是您的回收器视图接收空上下文的原因。在传入适配器对象之前，需要初始化上下文。我希望这能解决你的问题
context = getActivity();
adapter = new Adattatore_Main(context, movies);
然后在适配器上更改以下代码后
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater = inflater.from(parent.getContext()).inflate(R.layout.fragment_row, parent ,false);
答案 1 :(得分：0)
写
LayoutInflater inflater = LayoutInflater.from(parent.getcontext());
<强>更新
似乎你没有在适配器中传递上下文。如果你需要在片段中使用任何上下文，那么使用getActivity（）。它将解决您的上下文初始化问题。