¿Cómo establecer OnItemClickListener para un adaptador personalizado para iniciar una nueva actividad con el parámetro en el elemento?

Question

Utilizo esta muestra (http://www.ezzylearning.com/tutorial.aspx?tid=1763429&q=customizing-android-listview-Items- with-custom-arrayadapter) para crear mi adaptador personalizado. Tengo 2 archivos de diseño, whatson.xml y whatsonList.xml para crear una estructura principal y una subcrittura para la vista de lista para mostrar elementos en un formato personalizado.

Mi problema es, para cada elemento, la vista de la lista, quiero agregar un oyente, por lo que cuando hago clic en el elemento, inicia una nueva actividad, que muestra más información/detalles sobre este elemento de lista. Para averiguar en qué hice clic, quiero usar un parámetro variable cuando inicie la actividad de detalles. Pero sigo recibiendo error para este proceso.

El código de la página de la actividad principal es como:

package com.learn.whatson;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class WhatsOnActivity extends Activity
{
    private ListView listView;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.whatson);

        WhatsOnItemData whatsOnItemData[] = new WhatsOnItemData[] { 
            new WhatsOnItemData(R.drawable.a1_icon, "a1Title", "a1Body"), 
    new WhatsOnItemData(R.drawable.a2_icon, "a2Title", "a2Body"),
    new WhatsOnItemData(R.drawable.a3_icon, "a3Title", "a3Body")};

        CustomAdapter adapter = new CustomAdapter(this,R.layout.whatsonlist, whatsOnItemData);

        listView = (ListView) findViewById(R.id.listview_whatsonlist);

        listView.setOnItemClickListener(new OnItemClickListener()
        {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id)
            {
                Intent whatsOnItemDetailsIntent = new Intent(WhatsOnActivity.this, WhatsOnItemDetailsActivity.class);

                CustomAdapter ca = (CustomAdapter)parent.getAdapter();
                WhatsOnItemData woid = (WhatsOnItemData)ca.getItem(position);

                whatsOnItemDetailsIntent.putExtra("whatsonitemdetails", woid.title);
                startActivity(whatsOnItemDetailsIntent);    
            }
        });



        listView.setAdapter(adapter);

    }

    public class CustomAdapter extends ArrayAdapter<WhatsOnItemData>
    {

        Context context;
        int layoutResourceId;
        WhatsOnItemData data[] = null;

        public CustomAdapter(Context context, int layoutResourceId, WhatsOnItemData[] data)
        {
            super(context, layoutResourceId, data);
            this.layoutResourceId = layoutResourceId;
            this.context = context;
            this.data = data;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent)
        {
            View row = convertView;
            WhatsOnItemDataHolder holder = null;

            if (row == null)
            {
                LayoutInflater inflater = ((Activity) context).getLayoutInflater();
                row = inflater.inflate(layoutResourceId, parent, false);

                holder = new WhatsOnItemDataHolder();
                holder.imgIcon = (ImageView) row.findViewById(R.id.imageview_whatsonitemicon);
                holder.txtTitle = (TextView) row.findViewById(R.id.whatsonitemtitle);
                holder.txtBody = (TextView) row.findViewById(R.id.whatsonitembody);

                row.setTag(holder);
            }
            else
            {
                holder = (WhatsOnItemDataHolder) row.getTag();
            }

            WhatsOnItemData whatsOnItemData = data[position];
            holder.txtTitle.setText(whatsOnItemData.title);
            holder.imgIcon.setImageResource(whatsOnItemData.icon);
            holder.txtBody.setText(whatsOnItemData.body);

            return row;
        }

        public class WhatsOnItemDataHolder
        {
            ImageView imgIcon;
            TextView txtTitle;
            TextView txtBody;
        }
    }

    public class WhatsOnItemData
    {
        public int icon;
        public String title;
        public String body;

        public WhatsOnItemData()
        {
            super();
        }

        public WhatsOnItemData(int icon, String title, String body)
        {
            super();
            this.icon = icon;
            this.title = title;
            this.body = body;
        }
    }
}

Mi problema es si es el lugar correcto y el código correcto para agregar OnItemClickListener en el método OnCreate como.

listView.setOnItemClickListener(new OnItemClickListener()
{
    public void onItemClick(AdapterView<?> parent, View view, int position, long id)
    {
        Intent whatsOnItemDetailsIntent = new Intent(WhatsOnActivity.this, WhatsOnItemDetailsActivity.class);

        CustomAdapter ca = (CustomAdapter)parent.getAdapter();
        WhatsOnItemData woid = (WhatsOnItemData)ca.getItem(position);

        whatsOnItemDetailsIntent.putExtra("whatsonitemdetails", woid.title);
        startActivity(whatsOnItemDetailsIntent);    
    }
});

Código Whatson.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <ImageView
        android:id="@+id/imageview_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="5dp"
        android:src="@drawable/whatson_title"
        android:contentDescription="@string/whatson" />
    <ListView
        android:id="@+id/listview_whatsonlist"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
</LinearLayout>

whatSsonItemList.xml Código:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >
    <ImageView
        android:id="@+id/imageview_whatsonitemicon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp" 
        android:contentDescription="@string/whatsonitemicon" />
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >        
        <TextView
            android:id="@+id/whatsonitemtitle"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:textStyle="bold"  />
        <TextView
            android:id="@+id/whatsonitembody"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:textSize="10sp"  />
    </LinearLayout>
</LinearLayout>

Gracias.

Recibí este error:

W/ResourceType(621): No package identifier when getting value for resource number 0x00000000
D/AndroidRuntime(621): Shutting down VM
W/dalvikvm(621): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
E/AndroidRuntime(621): FATAL EXCEPTION: main
E/AndroidRuntime(621): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.learn.whatson/com.learn.whatson.WhatsOnItemDetailsActivity}: android.content.res.Resources$NotFoundException: String resource ID #0x0
E/AndroidRuntime(621):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
E/AndroidRuntime(621):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
E/AndroidRuntime(621):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
E/AndroidRuntime(621):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
E/AndroidRuntime(621):  at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(621):  at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(621):  at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(621):  at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(621):  at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(621):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(621):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime(621):  at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(621): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x0
E/AndroidRuntime(621):  at android.content.res.Resources.getText(Resources.java:201)
E/AndroidRuntime(621):  at android.widget.TextView.setText(TextView.java:2817)
E/AndroidRuntime(621):  at com.learn.whatson.WhatsOnItemDetailsActivity.onCreate(WhatsOnItemDetailsActivity.java:28)
E/AndroidRuntime(621):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
E/AndroidRuntime(621):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
E/AndroidRuntime(621):  ... 11 more

Creo que la parte más importante es:

E/AndroidRuntime(621): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.learn.whatson/com.learn.whatson.WhatsOnItemDetailsActivity}: android.content.res.Resources$NotFoundException: String resource ID #0x0

que creo que está relacionado con el oyente que agregué.

Answer 1

Creo que descubrí por qué.

Necesito mover el OnItemClickListener después

listView.setAdapter(adapter);

Y también actividad whatsonitemdetailsactivity androidmanifest.xml.

Answer 2

Asegúrese de que su actividad "WhatSsonItemDetailSactivity" tenga una entrada en AndroidManifest.xml.