我的代码显示错误膨胀类片段，用于回收器视图。这是我的代码，Adapter类和我使用的所有xml文件

时间：2016-02-22 07:28:45

标签： android android-fragments android-studio android-recyclerview material-design

我正在搜索类似的问题，发现人们要么没有为Recycler View编写编译依赖项，要么他们没有在代码中提到正确的id，如xml中所使用的那样，或者他们在onCreateViewHolder中返回null。我确保不重复这些错误，但应用程序仍然崩溃。有人可以帮助我，我对Android开发很新。

适配器类：

package com.example.sayan.materialtoolbar;

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.ImageView;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;

/**
 * Created by SAYAN on 21-02-2016.
 */
public class AppAdaptor extends RecyclerView.Adapter<AppAdaptor.myViewHolder> {
    private LayoutInflater inflater;
    List<Information> data= Collections.emptyList();

    public AppAdaptor(Context context, List<Information> data){
        inflater=LayoutInflater.from(context);
        this.data=data;
    }
    @Override
    public myViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view=inflater.inflate(R.layout.custom_row, parent,false);
        myViewHolder holder=new myViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(myViewHolder holder, int position) {
        Information current=data.get(position);
        holder.title.setText(current.title);
        holder.icon.setImageResource(current.iconId);
    }

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

    class myViewHolder extends RecyclerView.ViewHolder {
        TextView title;
        ImageView icon;
        public myViewHolder(View itemView) {
            super(itemView);
            title= (TextView) itemView.findViewById(R.id.listText);
            icon= (ImageView) itemView.findViewById(R.id.listIcon);

        }
    }
}

用于存储数据的类：

package com.example.sayan.materialtoolbar;

/**
 * Created by SAYAN on 21-02-2016.
 */
public class Information {
    int iconId;
    String title;
}

导航抽屉碎片

package com.example.sayan.materialtoolbar;


import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;
import java.util.List;


/**
 * A simple {@link Fragment} subclass.
 */
public class NavigationDrawerFragment extends Fragment {

    private static final String PREF_FILE_NAME ="testpref" ;
    private static final String KEY_USER_LEARNED_DRAWER ="user_learned_drawer" ;
    private ActionBarDrawerToggle mDrawerToggle;
    private DrawerLayout mDrawerLayout;
    private boolean mUserLearned;
    private boolean mFromSavedInstanceState;
    private View containerView;

    private RecyclerView recyclerView;
    private AppAdaptor adaptor;

    public NavigationDrawerFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        readFromPreferences(getActivity(), KEY_USER_LEARNED_DRAWER, "false");
        mUserLearned=Boolean.valueOf(readFromPreferences(getActivity(), KEY_USER_LEARNED_DRAWER, "false"));
        if(savedInstanceState!=null)
            mFromSavedInstanceState=true;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View layout=inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
        recyclerView= (RecyclerView) layout.findViewById(R.id.drawer_layout);
        adaptor=new AppAdaptor(getActivity(),getData());
        recyclerView.setAdapter(adaptor);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        return layout;
    }


    public void setUp(int fragmnentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
        containerView=getActivity().findViewById(fragmnentId);
        mDrawerLayout=drawerLayout;
        mDrawerToggle=new ActionBarDrawerToggle(getActivity(),drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close){
            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                if(mFromSavedInstanceState){
                    mUserLearned=true;
                    saveToPreferences(getActivity(),KEY_USER_LEARNED_DRAWER,mUserLearned+"");
                }
                getActivity().invalidateOptionsMenu();
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                getActivity().invalidateOptionsMenu();
            }
        };
        if(!mUserLearned && !mFromSavedInstanceState)
            mDrawerLayout.openDrawer(containerView);
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        mDrawerLayout.post(new Runnable() {
            @Override
            public void run() {
                mDrawerToggle.syncState();
            }
        });
    }
    public void saveToPreferences(Context context, String preferenceName, String preferenceValue){
        SharedPreferences sharedPreferences =context.getSharedPreferences(PREF_FILE_NAME,Context.MODE_PRIVATE);
        SharedPreferences.Editor editor=sharedPreferences.edit();
        editor.putString(preferenceName, preferenceValue);
        editor.apply();
    }
    public static String readFromPreferences(Context context, String preferenceName, String defaultValue){
        SharedPreferences sharedPreferences=context.getSharedPreferences(PREF_FILE_NAME,Context.MODE_PRIVATE);
        return sharedPreferences.getString(preferenceName,defaultValue);
    }
    public static List<Information> getData(){
        List<Information> data=new ArrayList<>();
        int[] icons={R.drawable.ic_book_black_36dp,R.drawable.ic_book_black_36dp,R.drawable.ic_book_black_36dp,R.drawable.ic_book_black_36dp};
        String[] titles={"Academic Details","Live Shows","Recorded Songs","Paper publications"};
        for(int i=0; i<icons.length && i<titles.length; i++)
        {
            Information current=new Information();
            current.iconId=icons[i];
            current.title=titles[i];
            data.add(current);
        }
        return data;
    }
}

custom_row xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="@dimen/icon_width"
        android:layout_height="@dimen/list_height"
        android:src="@drawable/ic_book_black_36dp"
        android:id="@+id/listIcon"
        android:paddingBottom="16dp"
        android:paddingTop="16dp"
        android:layout_gravity="center" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="@dimen/list_height"
        android:text="Dummy text"
        android:id="@+id/listText"
        android:textSize="14sp"
        android:paddingBottom="16dp"
        android:paddingTop="16dp"
        android:layout_gravity="center" />
</LinearLayout>

错误logcat 

02-22 11:35:19.908  21466-21466/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.sayan.materialtoolbar, PID: 21466
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sayan.materialtoolbar/com.example.sayan.materialtoolbar.MainActivity}: android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class fragment
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2426)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5443)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
     Caused by: android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class fragment
            at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
            at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
            at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
            at com.example.sayan.materialtoolbar.MainActivity.onCreate(MainActivity.java:18)
            at android.app.Activity.performCreate(Activity.java:6245)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5443)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
     Caused by: android.view.InflateException: Binary XML file line #22: Error inflating class fragment
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
            at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
            at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
            at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
            at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
            at com.example.sayan.materialtoolbar.MainActivity.onCreate(MainActivity.java:18)
            at android.app.Activity.performCreate(Activity.java:6245)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5443)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.RecyclerView.setAdapter(android.support.v7.widget.RecyclerView$Adapter)' on a null object reference
            at com.example.sayan.materialtoolbar.NavigationDrawerFragment.onCreateView(NavigationDrawerFragment.java:57)
            at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1036)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1226)
            at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1328)
            at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2284)
            at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:111)
            at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:314)
            at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:31)
            at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:79)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:754)
            at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
            at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
            at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
            at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
            at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
            at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
            at com.example.sayan.materialtoolbar.MainActivity.onCreate(MainActivity.java:18)
            at android.app.Activity.performCreate(Activity.java:6245)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
            at android.app.ActivityThread.-wrap11(ActivityThread.java)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5443)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

1 个答案:

答案 0 :(得分：0)

你有一个错误的id指定给recyclerview：

更改

File cacheDir = new File(android.os.Environment.getExternalStorageDirectory(), "folder-name"+"file-name");
//for make the directory if not exist 
        if (!cacheDir.exists())
             //check file and other code...

到

recyclerView= (RecyclerView) layout.findViewById(R.id.drawer_layout);
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