Question

我有这个代码;

private void displayResultList() {
    TextView tView = new TextView(this);
    getListView().addHeaderView(tView);

    setListAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, results));
    getListView().setTextFilterEnabled(true);

}

用于我需要的用途

public class MainActivity extends ListActivity {

但是当我使用

时

setContentView(R.layout.main);

我得到错误（第25行是“setContentView（R.layout.main）;）

02-26 04:47:22.770: E/AndroidRuntime(1031): FATAL EXCEPTION: main
02-26 04:47:22.770: E/AndroidRuntime(1031): Process: com.example.app.arr, PID: 1031
02-26 04:47:22.770: E/AndroidRuntime(1031): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.app.arr/com.example.app.arr.MainActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.os.Handler.dispatchMessage(Handler.java:102)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.os.Looper.loop(Looper.java:136)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.ActivityThread.main(ActivityThread.java:5017)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at java.lang.reflect.Method.invokeNative(Native Method)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at java.lang.reflect.Method.invoke(Method.java:515)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at dalvik.system.NativeStart.main(Native Method)
02-26 04:47:22.770: E/AndroidRuntime(1031): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.ListActivity.onContentChanged(ListActivity.java:243)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:293)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.Activity.setContentView(Activity.java:1929)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at com.example.app.arr.MainActivity.onCreate(MainActivity.java:25)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.Activity.performCreate(Activity.java:5231)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
02-26 04:47:22.770: E/AndroidRuntime(1031):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
02-26 04:47:22.770: E/AndroidRuntime(1031):     ... 11 more

我的问题是，当我使用“extends Activity”时，我可以做一些像“displayResultList”这样的事情

Answer 1

在布局中引用ListView

Listview mListView = (ListView) findViewById(R.id.myListView);

然后调用类似

的内容

mListView.setAdapter(mAdapter);

Answer 2

问题在以下行中描述。

Your content must have a ListView whose id attribute is 'android.R.id.list'

由于您使用的是ListActivity，因此ListView视图的名称必须为'android.R.id.list'。否则代码就好了。

因此，您需要对xml文件进行相应更改。

修改

您可以将以下代码放入ListView

编辑II

android:id="@android:id/list"

尝试在setContentView()
之后调用以下内容
ListView listview = getListView();

Answer 3

如果您使用 ListActivity ，那么在您的xml文件中，只需为ListView ID更改此内容

 android:id="@android:id/list"

并在您的Activity中调用此

ListView lv = getListView();

如果您使用的是活动，那么只需在您的java文件中找到您的ListView的ID

Listview mListView = (ListView) findViewById(R.id.myListView);

并为该

设置适配器

mListView.setAdapter(mAdapter);

Android - 列表活动到活动

3 个答案: