Erreur lors de la création de la création d'un ListView

Question

Je suis une erreur dans la création d'un ListView est ici l'erreur:

01-30 18:42:42.177: E/AndroidRuntime(396): FATAL EXCEPTION: main 
01-30 18:42:42.177: E/AndroidRuntime(396): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.databasetest/com.example.databasetest.ViewData}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.os.Looper.loop(Looper.java:123) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.ActivityThread.main(ActivityThread.java:4627) 
01-30 18:42:42.177: E/AndroidRuntime(396): at java.lang.reflect.Method.invokeNative(Native Method) 
01-30 18:42:42.177: E/AndroidRuntime(396): at java.lang.reflect.Method.invoke(Method.java:521) 
01-30 18:42:42.177: E/AndroidRuntime(396): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
01-30 18:42:42.177: E/AndroidRuntime(396): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
01-30 18:42:42.177: E/AndroidRuntime(396): at dalvik.system.NativeStart.main(Native Method) 
01-30 18:42:42.177: E/AndroidRuntime(396): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.ListActivity.onContentChanged(ListActivity.java:245) 
01-30 18:42:42.177: E/AndroidRuntime(396): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:201) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.Activity.setContentView(Activity.java:1647) 
01-30 18:42:42.177: E/AndroidRuntime(396): at com.example.databasetest.ViewData.onCreate(ViewData.java:19) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
01-30 18:42:42.177: E/AndroidRuntime(396): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
01-30 18:42:42.177: E/AndroidRuntime(396): ... 11 more 

je ne sais pas pourquoi l'émulateur recherche de l'androïde: R.id.list

est ici mon code sur l'activité qui utilisera le listView

package com.example.databasetest; 

import android.app.ListActivity; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.support.v4.widget.SimpleCursorAdapter; 
import android.widget.ListView; 

public class ViewData extends ListActivity { 

    private DBHandler dbHelper; 
    private SimpleCursorAdapter dataAdapter; 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.view_data); 

     displayListView(); 

    } 
    private void displayListView() { 

     Cursor cursor = dbHelper.getData(); 
     String[] columns = new String[] { 
       DBHandler.COL_NAME, 
       DBHandler.COL_ADDRESS, 
       DBHandler.COL_PHONE, 
       DBHandler.COL_EMAIL 
     }; 
     int[] to = new int[] { 
       R.id.name, 
       R.id.address, 
       R.id.phone, 
       R.id.email, 
     }; 
     dataAdapter = new SimpleCursorAdapter(this, R.layout.country_info, 
       cursor, 
       columns, 
       to, 
       0); 

     ListView listView = (ListView) findViewById(R.id.listView1); 
     // Assign adapter to ListView 
     listView.setAdapter(dataAdapter); 
    } 
} 

et est ici les deux fichier XML que je vais utiliser pour le listView view_data.xml

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

    <TextView 
     android:id="@+id/tv" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    <ListView 
     android:id="@+id/listView1" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" /> 

</LinearLayout> 

et country_info.xml enfin

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:padding="6dip" > 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:text="Name: " 
     android:textAppearance="?android:attr/textAppearanceMedium" /> 

    <TextView 
     android:id="@+id/textView2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/textView1" 
     android:layout_below="@+id/textView1" 
     android:text="Address: " 
     android:textAppearance="?android:attr/textAppearanceMedium" /> 

    <TextView 
     android:id="@+id/textView3" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/textView2" 
     android:layout_below="@+id/textView2" 
     android:text="Phone: " 
     android:textAppearance="?android:attr/textAppearanceMedium" /> 

    <TextView 
     android:id="@+id/textView4" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/textView3" 
     android:layout_below="@+id/textView3" 
     android:text="Email: " 
     android:textAppearance="?android:attr/textAppearanceMedium" /> 

    <TextView 
     android:id="@+id/name" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/textView3" 
     android:layout_alignBottom="@+id/textView3" 
     android:layout_toRightOf="@+id/textView3" 
     android:text="Test" /> 

    <TextView 
     android:id="@+id/address" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/textView4" 
     android:layout_alignBottom="@+id/textView4" 
     android:layout_alignLeft="@+id/continent" 
     android:text="Test" /> 

    <TextView 
     android:id="@+id/phone" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_above="@+id/textView3" 
     android:layout_toRightOf="@+id/textView3" 
     android:text="Test" /> 

    <TextView 
     android:id="@+id/email" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_above="@+id/textView2" 
     android:layout_alignLeft="@+id/name" 
     android:text="Test" /> 

</RelativeLayout> 

J'espère que vous pouvez me aider. Merci d'avance.

Answer 1

public class ViewData extends Activity 

changement ListActivity à activité.

Créer votre classe comme activité parce activité de la liste toujours utilisations dans la liste construite pas ur de liste personnalisée.

Answer 2

Mettre ceci:

ListView listview = (ListView) findViewById(android.R.id.list); 

et dans le fichier XML

<ListView 
android:id="@android:id/list" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent"/>