如何让自定义列表适配器在片段适配器内部工作？

Question

我正在使用自定义适配器来制作包含文本和按钮的自定义列表。 现在我需要在一个片段中看到这个视图，这样我可以轻松地在两个不同视图之间切换。 但我似乎无法弄清楚如何在片段代码中添加活动。是否因为我最终在另一个适配器内部安装了适配器？

编辑：我的applicantsRequestActivity是测试自定义列表的功能工作，我只需要将其移入片段。

我的主要活动

Activity (Label = "Main")]   
public class Test : FragmentActivity 
{ 


    private ViewPager mViewPager; 
    private SlidingTabScrollView mScrollView; 


    protected override void OnCreate (Bundle bundle) 
    { 
     base.OnCreate (bundle); 

     // Set our view from the "main" layout resource 
     SetContentView (Resource.Layout.FragMain); 
     mScrollView = FindViewById<SlidingTabScrollView> (Resource.Id.sliding_tabs); 
     mViewPager = FindViewById<ViewPager> (Resource.Id.viewPager); 

     // setup mViewPager 
     mViewPager.Adapter = new ApplicantsAdapter (SupportFragmentManager); 
     mScrollView.ViewPager = mViewPager; 


    } 


} 

我的片段

public class ApplicantsAdapter : FragmentPagerAdapter 
{ 
    private List<Android.Support.V4.App.Fragment> mFragmentHolder; 

    public applicantsReqAdapter (Android.Support.V4.App.FragmentManager fragManager) : base (fragManager) 
    { 
     mFragmentHolder = new List<Android.Support.V4.App.Fragment>(); 
     mFragmentHolder.Add (new Applicants()); 
     mFragmentHolder.Add (new Acceptes()); 
    } 

    public override int Count { 
     get { return mFragmentHolder.Count; } 
    } 

    public override Android.Support.V4.App.Fragment GetItem (int position) 
    { 
     return mFragmentHolder [position]; 
    } 
} 

public class Applicants : Android.Support.V4.App.Fragment 
{ 
    private EditText mTxt; 

    public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 
     var view = inflater.Inflate (Resource.Layout.Frag2Layout, container, false); 

     mTxt = view.FindViewById<EditText> (Resource.Id.editText1); 
     mTxt.Text = "Fragment 1 Class :)"; 
     return view; 
    } 

    public override string ToString() //Called on line 156 in SlidingTabScrollView 
    { 
     return "Fragment 1"; 
    } 
} 


public class Acceptes : Android.Support.V4.App.Fragment 
{ 
    private EditText mTxt; 

    public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 
     var view = inflater.Inflate (Resource.Layout.Frag2Layout, container, false); 

     mTxt = view.FindViewById<EditText> (Resource.Id.editText1); 
     mTxt.Text = "Fragment 2 Class :)"; 
     return view; 
    } 

    public override string ToString() //Called on line 156 in SlidingTabScrollView 
    { 
     return "Fragment 2"; 
    } 
} 

这里是什么，我需要为第一个片段

[Activity (Label = "Applicants")]   
public class applicantsRequestActivity : Activity 
{ 
    DatabaseAccess db = new DatabaseAccess(); 
    static ListView applicantsListView; 
    static applicantsRequestAdapter listAdapter; 
    static List<applicantsRequestList> applicantsList = new List<applicantsRequestList>(); 


    //private ViewPager mViewPager; 

    protected override void OnCreate (Bundle bundle) 
    { 
     base.OnCreate (bundle); 

     // Set our view from the "main" layout resource 


    } 


    public void GetApplicants() 
    { 
     /* 
     get the list from the database 

     */ 


     applicantsList.Add (new PartyRequestList() { applicantsId = 1, Name = "James"}); 
     applicantsList.Add (new PartyRequestList() { applicantsId = 2, Name = "Thomas"}); 

    } 

    bool isDownloaded = false; 

    protected override void OnStart() 
    { 
     base.OnStart(); 

     applicantsListView = FindViewById<ListView> (Resource.Id.PRR_listView); 
     listAdapter = new applicantsRequestAdapter (this, applicantsList); 
     applicantsListView.Adapter = listAdapter; 

     if (!isDownloaded) { 
      ThreadPool.QueueUserWorkItem (o => GetApplicants()); 
      isDownloaded = true; 
     } 
    }   

    public class PartyRequestList 
    { 
     public int applicantsId { get; set; } 

     public string Name { get; set; } 

    } 
    public class applicantsRequestAdapter : BaseAdapter<PartyRequestList> 
    { 
     private Button RemoveButton; 
     private Button AcceptButton; 
     private readonly IList<PartyRequestList> _items; 
     private readonly Context _context; 

     public applicantsRequestAdapter (Context context, IList<PartyRequestList> items) 
     { 
      _items = items; 
      _context = context; 
     } 

     public override long GetItemId (int position) 
     { 
      return position; 
     } 

     public override int Count { 
      get { return _items.Count; } 
     } 

     public override applicantsRequestList this [int position] { 
      get { return _items [position]; } 
     } 

     public override View GetView (int position, View convertView, ViewGroup parent) 
     { 
      var item = _items [position]; 
      var view = convertView; 

      if (view == null) { 
       var inflater = LayoutInflater.FromContext (_context); 
       view = inflater.Inflate (Resource.Layout.applicantsRequestRow, parent, false); 

       RemoveButton = view.FindViewById<Button> (Resource.Id.PRR_Remove); 
       AcceptButton = view.FindViewById<Button> (Resource.Id.PRR_Accept); 
       RemoveButton.Tag = position; 
       AcceptButton.Tag = position; 
       RemoveButton.Click += RemoveButton_Click; 
       AcceptButton.Click += AcceptButton_Click; 
      } 

      view.FindViewById<TextView> (Resource.Id.PRR_Name).Text = item.Name;     
      return view; 
     } 

     void RemoveButton_Click (object sender, EventArgs e) 
     { 
      var pos = (int)((Button)sender).Tag; 
      PartyRequestList _aa = applicantsList [pos]; 
      Toast.MakeText (_context, (String.Format ("Remove: {0} {1}", _aa.Name, pos)), ToastLength.Short).Show(); 
      applicantsList.RemoveAt (pos); 
      NotifyDataSetChanged(); 
     } 

     void AcceptButton_Click (object sender, EventArgs e) 
     { 
      var pos = (int)((Button)sender).Tag; 
      PartyRequestList _aa = applicantsList [pos]; 
      Toast.MakeText (_context, (String.Format ("Accept: {0} {1}", _aa.Name, pos)), ToastLength.Short).Show(); 
      NotifyDataSetChanged(); 
     } 
    } 
} 

视图主要axml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/myDrawer" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 
<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="#E2E2E2" 
    android:id="@+id/sample_main_layout"> 
    <View 
     android:layout_width="match_parent" 
     android:layout_height="1dp" 
     android:background="@android:color/darker_gray" /> 
    <SlidingTabLayout.SlidingTabScrollView 
     android:id="@+id/sliding_tabs" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 
    <android.support.v4.view.ViewPager 
     android:id="@+id/viewPager" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

2 axml我用我的自定义列表

名单axml

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

行axml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="horizontal" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content"> 
<TextView 
    android:id="@+id/PRR_Name" 
    android:layout_height="wrap_content" 
    android:layout_width="0px" 
    android:layout_weight="1" 
    android:text="Name" /> 
<Button 
    android:text="Remove" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/PRR_Remove" 
    android:tag="Remove" /> 
<Button 
    android:text="Accept" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/PRR_Accept" 
    android:tag="Accept" /> 

Answer 1

编辑：我的代码是Java不是C＃。供参考

你试图保持你的片段完全是什么功能？ 不幸的是，我不认为你能得到的片段内的活动的全部功能，但你可以访问它getActivity，例如：

getActivity().getSupportActionBar().setText("Title Bar Text here"); 

或直接，如：

MainActivity.staticMethod() 

这里是myListFragment类

public class MyListFragment extends Fragment { 

private final String LOG_TAG = MainActivity.class.getSimpleName(); 
private customList = new ListAdapater<RowItem>; 
private static ListView projectListView; 


public MyListFragment() { 
} 

public void add(View view) 
{ 
    Intent newIntent = new Intent(getActivity(), NewActivity.class); 
    startActivity(newIntent); 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    // Add this line in order for this fragment to handle menu events. 
    setHasOptionsMenu(true); 
     } 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 
    return super.onOptionsItemSelected(item); 
} 



@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 

    // The ArrayAdapter will take data from a source (DB/JSON Object) and 
    // use it to populate the ListView it's attached to. 
    // Get current list adapter from main and set it here to the rootview for this 
    // list fragment 
    //userDataAdapter = MainActivity.getListAdapter(); 
    View rootView = inflater.inflate(R.layout.fragment_listview, container, false); 
    projectListView = (ListView) rootView.findViewById(R.id.listview); 

    //Fill in list data 
    if (mySnapshot != null) { 
     for (DataSnapshot project : mySnapshot.getChildren()) { 
      if (project.child("Name").getValue() != null) { 

       //Get Project Details from Firebase JSON 
       String pName = project.child("Name").getValue().toString(); 
       String pDesc = project.child("Description").getValue().toString(); 
       int statusImageId = Utility.getStatusImage(Integer.parseInt(project.child("Status").getValue().toString())); 

       //Create RowItem for ArrayList 
       RowItem proj = new RowItem(statusImageId, pName, pDesc); 

       //Add RowItem to the adapter arraylist 
       customList.add(proj); 
      } 

     } 
    } 

    //set custom list 
    projectListView.setAdapter(customList); 

    //Set list click listener, if an item is clicked(selected) then we will change view 
    //to the nexst list 
    projectListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) { 
      //Handle list item clicks here. 
     } 
    });  
    return rootView; 
} 

}

这里是我的自定义接口的样子：

public class ListAdapter extends ArrayAdapter<RowItem> { 
//Context for the current view 
Context context; 


public ListAdapter(Context context, ArrayList<RowItem> items) { 
    super(context, R.layout.list_item_layout, items); 
    this.context = context; 
} 

/** 
* getView method returns the individual row views inflated so they can be displayed in the list 
* @param position position of the RowItem being requested in the ArrayList 
* @param convertView view to hold the entire row view before it is passed back to the ListView 
* @param parent reference to the ListView where the row will be shown. 
* @return view is given back to the listView so only displayed items + 1 on each side will stay 
*   android in memory 
*/ 
public View getView(int position, View convertView, ViewGroup parent) { 
    View view = convertView; 
    if(view == null) 
    { 
     LayoutInflater mInflater = (LayoutInflater) context 
       .getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
     view = mInflater.inflate(R.layout.list_item_layout, parent, false); 
    } 

    TextView txtDesc = (TextView) view.findViewById(R.id.description); 
    TextView txtTitle = (TextView) view.findViewById(R.id.title); 
    ImageView imageView = (ImageView) view.findViewById(R.id.icon); 

    txtDesc.setText(getItem(position).getDesc()); 
    txtTitle.setText(getItem(position).getTitle()); 
    imageView.setImageResource(getItem(position).getImageId()); 
    return view; 
} 

}

我RowItem类只是对标题/递减和在举行image_id参考两个字符串。

应该指出的是，片段与我的MainActivity内推出如下： 如果（savedInstanceState == NULL）{ getSupportFragmentManager（）调用BeginTransaction（） 。新增（R.id.container，新MyListFragment（ ）） .commit（）; }

其他文件：

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/container" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".MainActivity" 
tools:ignore="MergeRootFrame" 
/> 

listview.xml

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

<ListView 
android:id="@+id/listview" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:layout_weight = "1" 
/> 
<!-- Add Button --> 
<Button android:id="@+id/btnAdd" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="10dip" 
    android:onClick="add" 
    android:text="Add New"/> 
</LinearLayout> 

编辑：代码添加 - 希望我没有错过任何东西。

编辑：这是这个项目上的链接github https://github.com/thurst0n/Archie它可能更有意义，但请忽略我的不良编码习惯，其中大部分都是为了学校。我记得特别有问题最初得到一个listview工作在一个片段，而不仅仅是一个普通的活动。还要注意，我只是换出每个级别的列表适配器，而不是创建我的列表片段的另一个实例，这是一个设计选择，使其他功能更容易实现，但可能不是好的设计实践。我认为正确的做法是让碎片管理者处理后台堆栈。

//Use this for something? 
public void setContent(Fragment fragment) 
{ 
    getSupportFragmentManager().beginTransaction() 
      .replace(R.id.container, new MyListFragment()) 
      .commit(); 
}