ListActivity返回误差

Question

在这段不返回“不幸的是，应用程序已经停止”的代码上，ListActivity有什么需要呢？

&请不要反对！

package com.example.app;

Imports............

public class Main extends ListActivity 
{

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

    public void onListItemClick(ListView parent, View v,
        int position, long id)
 { }

}

09-12 00:52:51.373: D/AndroidRuntime(1871): Shutting down VM 09-12 00:52:51.373: W/dalvikvm(1871): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 09-12 00:52:51.393: E/AndroidRuntime(1871): FATAL EXCEPTION: main 09-12 00:52:51.393: E/AndroidRuntime(1871): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rss/com.example.rss.Main}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.ActivityThread.access$600(ActivityThread.java:123) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.os.Handler.dispatchMessage(Handler.java:99) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.os.Looper.loop(Looper.java:137) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.ActivityThread.main(ActivityThread.java:4424) 09-12 00:52:51.393: E/AndroidRuntime(1871): at java.lang.reflect.Method.invokeNative(Native Method) 09-12 00:52:51.393: E/AndroidRuntime(1871): at java.lang.reflect.Method.invoke(Method.java:511) 09-12 00:52:51.393: E/AndroidRuntime(1871): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 09-12 00:52:51.393: E/AndroidRuntime(1871): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 09-12 00:52:51.393: E/AndroidRuntime(1871): at dalvik.system.NativeStart.main(Native Method) 09-12 00:52:51.393: E/AndroidRuntime(1871): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list' 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.ListActivity.onContentChanged(ListActivity.java:243) 09-12 00:52:51.393: E/AndroidRuntime(1871): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:254) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.Activity.setContentView(Activity.java:1835) 09-12 00:52:51.393: E/AndroidRuntime(1871): at com.example.rss.Main.onCreate(Main.java:26) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.Activity.performCreate(Activity.java:4465) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 09-12 00:52:51.393: E/AndroidRuntime(1871): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 09-12 00:52:51.393: E/AndroidRuntime(1871): ... 11 more

Answer 1

由于您正在扩展ListActivity，所以需要有一个带有android:id="@android:id/list"的Listview。

如果您想使用@+id/lst_main，那么不要扩展ListActivity，只需扩展活动。

此外，您还需要使用适配器来膨胀列表视图。

Answer 2

必须将属性设置为ListView

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

另外，不要忘记在清单中登记你的活动。