Essayer de créer un adaptateur personnalisé

Question

J'ai commencé à apprendre le cours de développement Android, et pendant ce temps j'apprends des adaptateurs personnalisés.
Après l'exécution de ce code, l'application se bloque juste

Ceci est mon code tout

customlistview.java

package com.example.vamsi.customadapter; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.HashMap; 

/** 
* Created by vamsi on 3/12/2017. 
*/ 

public class customlistviewadadapter extends BaseAdapter { 
    private Context mcontext; 
    private ArrayList<HashMap<String,String>> books; 
    private static LayoutInflater inflater=null; 

    public customlistviewadadapter(Context context, ArrayList<HashMap<String,String>> data){ 
     mcontext=context; 
     books=data; 
     inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 
    @Override 
    public int getCount() { 
     return books.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return position; 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View view =convertView; 
     if(convertView==null){ 
      view=inflater.inflate(R.layout.list_row,null); 
      TextView title = (TextView)view.findViewById(R.id.title); 
      TextView author=(TextView)view.findViewById(R.id.author); 
      TextView pages=(TextView)view.findViewById(R.id.pages); 
      ImageView image=(ImageView)view.findViewById(R.id.listimg); 

      HashMap<String,String> mbook=new HashMap<>(); 
      mbook = books.get(position); 
      title.setText(mbook.get("title")); 
      author.setText(mbook.get("author")); 
      pages.setText(mbook.get("pages")); 



     } 

     return view; 
    } 
} 

MainActivity.java

package com.example.vamsi.customadapter; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import android.widget.Toast; 

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

public class MainActivity extends AppCompatActivity { 
    private ListView listview; 
    private customlistviewadadapter custlistadapter; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     final String[] bookTitles=new String[]{ 
       "alchemist", 
       "gulivers trvvels", 
       "brief history of time", 
       "get away with murder", 
       "god thank you", 
       "books books books" 
     }; 
     final String[] pages=new String[]{ 
       "100 pages", 
       "120 pages", 
       "111 pages", 
       "121 pages", 
       "123 pages" 
     }; 
     final String[] authors=new String[]{ 
       "lol", 
       "donno", 
       "stephen", 
       "boom", 
       "god", 
       "books again" 
     }; 
     ArrayList<HashMap<String,String>> authorlist=new ArrayList<>(); 
     for (int i=0;i<6;i++){ 
      HashMap<String,String> data=new HashMap<>(); 
      data.put("title",bookTitles[i]); 
      data.put("pages",pages[i]); 
      data.put("author",authors[i]); 

      authorlist.add(data); 

     } 
     listview=(ListView)findViewById(R.id.listview1); 
     custlistadapter=new customlistviewadadapter(getApplicationContext(),authorlist); 
     listview.setAdapter(custlistadapter); 
     listview.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       int mypos=position; 
       String itemclicked=listview.getItemAtPosition(mypos).toString(); 
       Toast.makeText(getApplicationContext(),"id cliccked"+itemclicked,Toast.LENGTH_SHORT).show(); 

      } 
     }); 
    } 
} 

list_row.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:background="@drawable/listselector" 
    android:orientation="horizontal" 
    android:layout_height="wrap_content" 
    > 
    <LinearLayout 
     android:id="@+id/thumbnail" 
     android:padding="3dp" 
     android:layout_alignParentLeft="true" 
     android:background="#ffeeeade" 
     android:layout_marginRight="5dp" 
     android:orientation="vertical" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"> 
     <ImageView 
      android:id="@+id/listimg" 
      android:layout_width="50dp" 
      android:layout_height="50dp" 
      android:src="@mipmap/ic_launcher"/> 
    </LinearLayout> 
    <TextView 
     android:id="@+id/title" 
     android:layout_alignTop="@+id/thumbnail" 
     android:layout_width="wrap_content" 
     android:text="the alchemist" 
     android:textSize="14sp" 
     android:textColor="#040404" 
     android:layout_toRightOf="@+id/thumbnail" 
     android:layout_height="wrap_content" /> 
    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/author" 
     android:layout_below="@+id/title" 
     android:text="paulo" 
     android:layout_toRightOf="@+id/thumbnail" 
     android:textColor="#ffde3a3d" 
     android:layout_marginTop="2dp" 
     /> 
    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="234 pages" 
     android:id="@+id/pages" 
     android:layout_alignParentRight="true" 
     android:layout_alignTop="@+id/title" 
     android:layout_marginRight="10dp" 
     android:textColor="#10bcc9" 
     android:gravity="right" 
     /> 
    <ImageView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:src="@android:drawable/ic_media_play" 
     android:layout_alignParentRight="true" 
     android:layout_centerVertical="true"/> 
</RelativeLayout> 

activity_main.xml

<?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/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.vamsi.customadapter.MainActivity"> 

    <ListView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:id="@+id/listview1" 
     android:listSelector="@drawable/listselector" 
     android:divider="@color/colorAccent" 
     android:dividerHeight="1dp" /> 
</RelativeLayout> 

J'ai essayé pour activer le débogage, et c'est la sortie de la console.

V/BoostFramework: mIOPStart method = public int com.qualcomm.qti.Performance.perfIOPrefetchStart(int,java.lang.String) 
V/BoostFramework: mIOPStop method = public int com.qualcomm.qti.Performance.perfIOPrefetchStop() 
V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@28f08ea 
V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@a9a47db 
D/AndroidRuntime: Shutting down VM 
E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: com.example.vamsi.customadapter, PID: 6371 
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.vamsi.customadapter/com.example.vamsi.customadapter.MainActivity}: java.lang.ArrayIndexOutOfBoundsException: length=5; index=5 
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2728) 
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2814) 
         at android.app.ActivityThread.-wrap12(ActivityThread.java) 
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1527) 
         at android.os.Handler.dispatchMessage(Handler.java:102) 
         at android.os.Looper.loop(Looper.java:154) 
         at android.app.ActivityThread.main(ActivityThread.java:6290) 
         at java.lang.reflect.Method.invoke(Native Method) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
        Caused by: java.lang.ArrayIndexOutOfBoundsException: length=5; index=5 
         at com.example.vamsi.customadapter.MainActivity.onCreate(MainActivity.java:51) 
         at android.app.Activity.performCreate(Activity.java:6760) 
         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134) 
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2681) 
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2814)  
         at android.app.ActivityThread.-wrap12(ActivityThread.java)  
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1527)  
         at android.os.Handler.dispatchMessage(Handler.java:102)  
         at android.os.Looper.loop(Looper.java:154)  
         at android.app.ActivityThread.main(ActivityThread.java:6290)  
         at java.lang.reflect.Method.invoke(Native Method)  
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)  
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)  
D/AppTracker: App Event: crash 
I/Process: Sending signal. PID: 6371 SIG: 9 
Disconnected from the target VM, address: 'localhost:8612', transport: 'socket' 

J'utilise l'API Niveau 25
Toute aide serait appréciée

Answer 1

pages a 5 valeurs, et non 6 comme les autres. En outre, vous avez codé en dur au-delà de la longueur de la matrice.

for (int i=0; i < 6; i++){ // Here 
    // Code removed 
} 

Donc, ne faites pas cela. Remplacer 6 avec 5, ou de préférence bookTitles.length ...

---

Ou encore mieux. En savoir plus sur les objets

public static class BookData { 
    public String title, author, pages; 
} 

Et faire une

Référez: CodePath | Using a Custom ArrayAdapter