[英]Your content must have a ListView whose id attribute is 'android.R.id.list' error
[英]Logcat error-Content must have a ListView whose id attribute is 'android.R.id.list'
我的列表视图显示了这样的错误,我在问题中提到了这个问题,尽管我在mainactivity中提到的也扩展了listactivity,并且我的布局也作为listview
activity_list_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ListView
android:id="@android:id/list"
android:layout_width="wrap_content"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>
Mainactivity.java
public class MainActivity extends ListActivity implements FetchDataListener{
private ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_item);
initView();
}
private void initView() {
// show progress dialog
dialog = ProgressDialog.show(this, "", "Loading...");
String url = "http://10.0.2.2/test/apps.php";
FetchDataTask task = new FetchDataTask(this);
task.execute(url);
}
@Override
public void onFetchComplete(List<Application> data) {
// dismiss the progress dialog
if(dialog != null) dialog.dismiss();
// create new adapter
ApplicationAdapter adapter = new ApplicationAdapter(this, data);
// set the adapter to list
setListAdapter(adapter);
}
@Override
public void onFetchFailure(String msg) {
// dismiss the progress dialog
if(dialog != null) dialog.dismiss();
// show failure message
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
}
我的日志猫错误显示如下
5-17 11:30:30.649: E/AndroidRuntime(1177): FATAL EXCEPTION: main
05-17 11:30:30.649: E/AndroidRuntime(1177): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jsonandroid/com.example.jsonandroid.MainActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.ActivityThread.access$600(ActivityThread.java:141)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.os.Handler.dispatchMessage(Handler.java:99)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.os.Looper.loop(Looper.java:137)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.ActivityThread.main(ActivityThread.java:5039)
05-17 11:30:30.649: E/AndroidRuntime(1177): at java.lang.reflect.Method.invokeNative(Native Method)
05-17 11:30:30.649: E/AndroidRuntime(1177): at java.lang.reflect.Method.invoke(Method.java:511)
05-17 11:30:30.649: E/AndroidRuntime(1177): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-17 11:30:30.649: E/AndroidRuntime(1177): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-17 11:30:30.649: E/AndroidRuntime(1177): at dalvik.system.NativeStart.main(Native Method)
05-17 11:30:30.649: E/AndroidRuntime(1177): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.ListActivity.onContentChanged(ListActivity.java:243)
05-17 11:30:30.649: E/AndroidRuntime(1177): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:273)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.Activity.setContentView(Activity.java:1881)
05-17 11:30:30.649: E/AndroidRuntime(1177): at com.example.jsonandroid.MainActivity.onCreate(MainActivity.java:17)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.Activity.performCreate(Activity.java:5104)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-17 11:30:30.649: E/AndroidRuntime(1177): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-17 11:30:30.649: E/AndroidRuntime(1177): ... 11 more
您只需要将activity_list_item.xml中的列表视图ID更改为@android:id / list,如果您使用ListActivity,则listview ID必须像上面提到的那样
将布局更改为
<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
删除对setContentView
的调用。
如果仅想显示ListView,则ListActivity
不需要通过setContentView()方法为其分配布局。ListActivity默认情况下包含ListView。
万一您需要在ListActivity中包含比ListView多的View,您仍然可以为活动分配布局。 在这种情况下,您的布局必须包含一个ListView,并将android:id
属性设置为@android:id/list
。
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