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我在搜索類似的問題，發現人們或者沒有編寫Recycler View的編譯依賴項，或者他們沒有在代碼中提到正確的id，在xml中使用，或者他們在onCreateViewHolder中返回null。我一定不要重複這些錯誤，但應用程序仍然崩潰。有人可以幫助我，我對Android開發非常陌生。我的代碼顯示錯誤膨脹類的片段，爲回收視圖。這是我的代碼，Adapter類和我使用的所有xml文件
適配器類：
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);
}
}
}
類，用於存儲所述數據：
package com.example.sayan.materialtoolbar;
/**
* Created by SAYAN on 21-02-2016.
*/
public class Information {
int iconId;
String title;
}
抽屜式導航片段
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>
錯誤的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)
您發佈的一切，除了類有錯誤 –
此行重新可能出錯cyclerView =（RecyclerView）layout.findViewById（R.id.drawer_layout）; ，是您的recyclerview ID真的drawer_layout –
我打電話給錯誤的回收站視圖ID。 –