android：在查看下一個選項卡時收到異常

我想在片段中添加Recyclerview，然後想要在viewpager中添加片段。所以我按照教程上youtube.after編譯..recyclerview顯示，但是當我去到下一個選項卡，異常出現。希望你們能幫我解決這個問題。android：在查看下一個選項卡時收到異常

ERROR

D/AndroidRuntime: Shutting down VM 
E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: com.example.user.recyclerviewpagerfragment, PID: 3705 
        java.lang.ClassCastException: android.support.v7.widget.LinearLayoutCompat cannot be cast to android.support.v7.widget.RecyclerView 
         at com.example.user.recyclerviewpagerfragment.Fragments.DocumentaryFragment.onCreateView(DocumentaryFragment.java:30) 
         at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080) 
         at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108) 
         at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290) 
         at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801) 
         at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1638) 
         at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:679) 
         at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) 
         at android.support.v4.view.ViewPager.populate(ViewPager.java:1240) 
         at android.support.v4.view.ViewPager.populate(ViewPager.java:1088) 
         at android.support.v4.view.ViewPager$3.run(ViewPager.java:275) 
         at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) 
         at android.view.Choreographer.doCallbacks(Choreographer.java:670) 
         at android.view.Choreographer.doFrame(Choreographer.java:603) 
         at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) 
         at android.os.Handler.handleCallback(Handler.java:739) 
         at android.os.Handler.dispatchMessage(Handler.java:95) 
         at android.os.Looper.loop(Looper.java:148) 
         at android.app.ActivityThread.main(ActivityThread.java:5417) 
         at java.lang.reflect.Method.invoke(Native Method) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
I/Process: Sending signal. PID: 3705 SIG: 9 
Application terminated.

MainActivity.java

package com.example.user.recyclerviewpagerfragment; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.design.widget.TabLayout; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 

import com.example.user.recyclerviewpagerfragment.Fragments.CrimeFragment; 
import com.example.user.recyclerviewpagerfragment.Fragments.DocumentaryFragment; 
import com.example.user.recyclerviewpagerfragment.Fragments.DramaFragment; 

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     //initialize view pager. 
     ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager_id); 
     this.addPages(viewPager); 

     TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_id); 
     //it gonna occupy the whole screen.. 
     tabLayout.setTabGravity(TabLayout.GRAVITY_FILL); 
     tabLayout.setupWithViewPager(viewPager); 
     tabLayout.addOnTabSelectedListener(listener(viewPager)); 
    } 

    // add all pages 
    private void addPages(ViewPager pager){ 
     FragPagerAdapter adapter = new FragPagerAdapter(getSupportFragmentManager()); 
     adapter.addPage(new CrimeFragment()); 
     adapter.addPage(new DramaFragment()); 
     adapter.addPage(new DocumentaryFragment()); 

     //set adapter to pager 
     pager.setAdapter(adapter); 
    } 

    private TabLayout.OnTabSelectedListener listener(final ViewPager pager){ 
     return new TabLayout.OnTabSelectedListener() { 
      @Override 
      public void onTabSelected(TabLayout.Tab tab) { 
       pager.setCurrentItem(tab.getPosition()); 
      } 

      @Override 
      public void onTabUnselected(TabLayout.Tab tab) { 

      } 

      @Override 
      public void onTabReselected(TabLayout.Tab tab) { 

      } 
     }; 

    } 

}

FragPagerAdapter.java

package com.example.user.recyclerviewpagerfragment; 

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 

import java.util.ArrayList; 

/** 
* Created by User on 10/4/2016. 
*/ 

public class FragPagerAdapter extends FragmentPagerAdapter{ 

    //create arraylist..where its gonna hol fragment. 

    ArrayList<Fragment> pages = new ArrayList<>(); 

    public FragPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     return pages.get(position); 
    } 

    @Override 
    public int getCount() { 
     return pages.size(); 
    } 

    // add a page 
    public void addPage(Fragment f){ 
     pages.add(f); 
    } 

    //set title for tab 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return pages.get(position).toString(); 
     //return super.getPageTitle(position); 
    } 
}

MyRecyclerAdapter.java

package com.example.user.recyclerviewpagerfragment.Recycler; 

import android.content.Context; 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Toast; 

import com.example.user.recyclerviewpagerfragment.R; 

import java.util.ArrayList; 

/** 
* Created by User on 10/4/2016. 
*/ 

public class MyRecyclerAdapter extends RecyclerView.Adapter<MyViewHolder> { 

    Context context; 
    ArrayList<Movie> movies; 

    public MyRecyclerAdapter(Context context, ArrayList<Movie> movies) { 
     this.context = context; 
     this.movies = movies; 
    } 

    //initialize holder. 
    @Override 
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.model,null); 
     MyViewHolder holder = new MyViewHolder(view); 
     return holder; 
     //return null; 
    } 


    //bind data to views 
    @Override 
    public void onBindViewHolder(MyViewHolder holder, int position) { 
     holder.nameTxt.setText(movies.get(position).getImage()); 
     holder.img.setImageResource(movies.get(position).getImage()); 

     //listener 
     holder.setItemClickListener(new ItemClickListener() { 
      @Override 
      public void onItemClick(View view, int position) { 
       Toast.makeText(context,movies.get(position).getName(),Toast.LENGTH_SHORT).show(); 
      } 
     }); 
    } 

    @Override 
    public int getItemCount() { 
     return movies.size(); 
    } 
}

MyViewHolder.java

package com.example.user.recyclerviewpagerfragment.Recycler; 

import android.support.v7.widget.RecyclerView; 
import android.view.View; 
import android.widget.ImageView; 
import android.widget.TextView; 

import com.example.user.recyclerviewpagerfragment.R; 

/** 
* Created by User on 10/4/2016. 
*/ 

public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ 

    ImageView img; 
    TextView nameTxt; 
    ItemClickListener itemClickListener; 
    public MyViewHolder(View itemView) { 
     super(itemView); 

     nameTxt = (TextView) itemView.findViewById(R.id.nameTxt); 
     img = (ImageView) itemView.findViewById(R.id.movieImage); 

     //above...if want to make click on nameTxt,can change itemView to nameTxt 
     itemView.setOnClickListener(this); 
    } 

    public void setItemClickListener(ItemClickListener itemClickListener){ 
     this.itemClickListener = itemClickListener; 
    } 

    @Override 
    public void onClick(View view) { 
     this.itemClickListener.onItemClick(view,getLayoutPosition()); 
    } 
}

DocumentaryFragment.java

package com.example.user.recyclerviewpagerfragment.Fragments; 

import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 

import com.example.user.recyclerviewpagerfragment.R; 
import com.example.user.recyclerviewpagerfragment.Recycler.Movie; 
import com.example.user.recyclerviewpagerfragment.Recycler.MyRecyclerAdapter; 

import java.util.ArrayList; 

/** 
* Created by User on 10/4/2016. 
*/ 

public class DocumentaryFragment extends Fragment { 
    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 

     //call view 
     View view = inflater.inflate(R.layout.documentary_fragment,null); 
     //recyclerview 
     RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.mRecyclerDocumentary); 
     recyclerView.setLayoutManager(new LinearLayoutManager(this.getActivity())); 
     //set Adapter 
     recyclerView.setAdapter(new MyRecyclerAdapter(this.getActivity(),getDocumentaryMovies())); 
     return view; 
     //return super.onCreateView(inflater, container, savedInstanceState); 
    } 

    private ArrayList<Movie> getDocumentaryMovies() { 
     //collection of crime movies. 
     ArrayList<Movie> movies = new ArrayList<>(); 
     //single movie 
     Movie movie = new Movie("Crime:tank5",R.drawable.e); 
     //add to collection.. 
     movies.add(movie); 

     movie = new Movie("Crime:tank6",R.drawable.f); 
     movies.add(movie); 
     return movies; 
     /* 
     Movie movie = new Movie("tank1",R.drawable.a); 
     movies.add(movie); 

     Movie movie = new Movie("tank1",R.drawable.a); 
     movies.add(movie); 
     */ 
    } 


    //set title for the fragment 

    @Override 
    public String toString() { 
     return "Documentary"; 
    } 
}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
    <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:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:fitsSystemWindows="true" 
     tools:context="com.example.user.recyclerviewpagerfragment.MainActivity"> 

     <android.support.design.widget.AppBarLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:theme="@style/AppTheme.AppBarOverlay"> 

      <android.support.v7.widget.Toolbar 
       android:id="@+id/toolbar" 
       android:layout_width="match_parent" 
       android:layout_height="?attr/actionBarSize" 
       android:background="?attr/colorPrimary" 
       app:popupTheme="@style/AppTheme.PopupOverlay" /> 

      <!-- add above for adding tablayout --> 
      <android.support.design.widget.TabLayout 
       android:id="@+id/tab_id" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"/> 

     </android.support.design.widget.AppBarLayout> 

     <include layout="@layout/content_main" /> 

     <android.support.design.widget.FloatingActionButton 
      android:id="@+id/fab" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_gravity="bottom|end" 
      android:layout_margin="@dimen/fab_margin" 
      app:srcCompat="@android:drawable/ic_dialog_email" /> 

     <!-- add above for adding viewpager --> 
     <android.support.v4.view.ViewPager 
      android:id="@+id/viewpager_id" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

    </android.support.design.widget.CoordinatorLayout>

Documentary_fragment.xml

<android.support.v7.widget.LinearLayoutCompat 
    android:id="@+id/mRecyclerDocumentary" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"></android.support.v7.widget.LinearLayoutCompat> </LinearLayout>

Model.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v7.widget.CardView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    xmlns:card_view="http://schemas.android.com/apk/res-auto" 
    android:layout_margin="10dp" 
    card_view:cardCornerRadius="10dp" 
    card_view:cardElevation="10dp" 
    android:layout_height="wrap_content"> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <ImageView 
      android:layout_width="wrap_content" 
      android:layout_height="match_parent" 
      android:id="@+id/movieImage" 
      android:padding="10dp" 
      android:src="@drawable/a"/> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="Name" 
      android:id="@+id/nameTxt" 
      android:padding="10dp" 
      android:textColor="@color/colorAccent" 
      android:layout_below="@+id/movieImage" 
      android:layout_alignParentLeft="true"/> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="this tanks is awsome no need to jurge it." 
      android:id="@+id/descTxt" 
      android:layout_below="@+id/nameTxt" 
      android:layout_alignParentLeft="true"/> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceLarge" 
      android:text="TV Show" 
      android:id="@+id/posTxt" 
      android:padding="10dp" 
      android:layout_below="@id/movieImage" 
      android:layout_alignParentRight="true"/> 

     <CheckBox 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:id="@+id/chk" 
      android:layout_alignParentRight="true"/> 
    </RelativeLayout> 
</android.support.v7.widget.CardView>

來源

2016-10-04 khoi

誤差

java.lang.ClassCastException: android.support.v7.widget.LinearLayoutCompat cannot be cast to android.support.v7.widget.RecyclerView 
        at com.example.user.recyclerviewpagerfragment.Fragments.DocumentaryFragment.onCreateView(DocumentaryFragment.java:30)

正如它說的問題是在DocumentaryFragment中，您正在將LinearLayout投射到ReciclerView，您應該爲我們提供Fragment。希望它有幫助，我想評論，但我沒有必要條件。

來源

2016-10-04 17:26:11

哦，對不起，我分享了錯誤的代碼。 – khoi

當我再次檢查..at documentary_fragment.xml，即時通訊使用LinearLayout而不是recyclerview ..謝謝 – khoi

android：在查看下一個選項卡時收到異常

回答

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