在Android上使用ListFragment时出现问题

Question

我在Android编程方面很陌生(我编写了大量的PC应用程序并使用了Java),我很茫然.我想创建一个使用片段的应用程序.我想创建Fragment Programaticaly(正如Android Developer页面上的介绍所说)买我的应用程序一直崩溃,我不知道为什么.

这是我的主要活动的代码:

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

    FragmentManager fmanager = getFragmentManager();
    FragmentTransaction ftransaction = fmanager.beginTransaction();
    FileBrowser fbrowser = new FileBrowser();
    ftransaction.add(R.layout.main,fbrowser, "FileBrowser");       
    ftransaction.commit();

    fbrowser.test();
}

这是FileBrowser的代码:

公共类FileBrowser扩展了ListFragment {

public void test(){
    System.err.println("Entre a test!!!");
    String[] MyList = {"HOla","Mundo","De","Las","Listas"};
    if (getActivity() == null){
        System.err.println("I get a NULL Activity");
    }
    else{
        System.err.println("No NULL Activity Attempting to Create an Adapter");
        ArrayAdapter<String> aa = new ArrayAdapter<String>(getActivity(), R.layout.file_row, MyList);
    }
    //setListAdapter(new ArrayAdapter<String>(this.getActivity(), R.layout.file_row, MyList));
}

}

我要做的就是在片段中打印字符串列表MyList.但是我程序崩溃了,我收到这个错误:

06-09 19:25:42.920:ERROR/AndroidRuntime(26064):java.lang.RuntimeException:无法启动活动ComponentInfo {com.ccr/com.ccr.Main}:java.lang.IllegalArgumentException:找不到id的视图片段FileBrowser的0x7f030001 {4077d558#0 id = 0x7f030001 FileBrowser}

谢谢你的帮助!

PD:我也得到了一个N​​ULL活动消息.

---

我已经尝试过了,它也没用.

这是我的新xml文件

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

这就是我的代码所读的内容:

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

    FragmentManager fmanager = getFragmentManager();
    FragmentTransaction ftransaction = fmanager.beginTransaction();
    FileBrowser fbrowser = new FileBrowser();
    System.err.println("I'm about to add the fragment");
    ftransaction.add(R.id.flFileBrowser,fbrowser, "FileBrowser");
    System.err.println("fragment added");
    ftransaction.commit();
    System.err.println("Done");
}

这是我的输出:

06-10 12:23:21.520: WARN/System.err(30826): I'm about to add the fragment
06-10 12:23:21.520: WARN/System.err(30826): fragment added
06-10 12:23:21.520: WARN/System.err(30826): Done
06-10 12:23:21.520: WARN/dalvikvm(30826): threadid=1: thread exiting with uncaught exception (group=0x40131760)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826): FATAL EXCEPTION: main
06-10 12:23:21.520: ERROR/AndroidRuntime(30826): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ccr/com.ccr.Main}: java.lang.IllegalArgumentException: No view found for id 0x7f050000 for fragment FileBrowser{4077d3f0 #0 id=0x7f050000 FileBrowser}
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1748)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1764)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at android.app.ActivityThread.access$1500(ActivityThread.java:122)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1002)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at android.os.Looper.loop(Looper.java:132)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at android.app.ActivityThread.main(ActivityThread.java:4025)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at java.lang.reflect.Method.invokeNative(Native Method)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at java.lang.reflect.Method.invoke(Method.java:491)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826):     at dalvik.system.NativeStart.main(Native Method)
06-10 12:23:21.520: ERROR/AndroidRuntime(30826): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f050000 for fragment FileBrowser{4077d3f0 #0 id=0x7f050000 FileBrowser}

Answer 1

问题出在这里:

ftransaction.add(R.layout.main,fbrowser, "FileBrowser");

第一个参数是期望活动布局中存在的视图的id.你正在传递布局.例如,假设你在活动的布局中有一个FrameLayout id="@+id/container"然后你会调用:

ftransaction.add(R.id.container,fbrowser, "FileBrowser");

http://developer.android.com/reference/android/app/FragmentTransaction.html#add%28int,%20android.app.Fragment,%20java.lang.String%29