Question

我尝试实施FloatingGroupExpandableListView，但我无法根据自定义列表视图对其进行修改。

以下代码在列表中实现了两种类型的标头。

嗯，实现2种类型的标题对我来说是一项复杂的任务。现在，实现FloatingGroupExpandableListView并非易事，我无法根据自定义列表视图自定义代码。

请参阅MyCustomAdapter课程，＆amp;请告诉我如何修改它以完成我的任务？

public class ContentsFragment extends ListFragment  implements OnTouchListener {

private MyCustomAdapter mAdapter;
Activity temp = getActivity();

String []s = new String[500];
ArrayList<GS> q = new ArrayList<GS>();
ListView lv;
int count=0;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

DBAdapter db = DBAdapter.getDBAdapter(getActivity());

if (!db.checkDatabase())   
    db.createDatabase(getActivity());

db.openDatabase();

q = db.getData();

mAdapter = new MyCustomAdapter(getActivity());

mAdapter.addSeparatorItem(new ContentWrapper(q.get(0).getA_name(),null,null));//1st type of seperator
mAdapter.addItem(new ContentWrapper(q.get(0).getAS_name(), q.get(0).getDesc_art(),null));


for (int i = 1; i <= 14; i++) {
if (!(q.get(i).getA_name().trim().equals(q.get(i-1).getA_name().trim()))) {

  mAdapter.addSeparatorItem(new ContentWrapper(q.get(i).getA_name(), null,null));//2nd type of separator
}
if(!(q.get(i).getExtra()==null))
  mAdapter.addGraySeparatorItem(new ContentWrapper(q.get(i).getExtra(),null,null));

mAdapter.addItem(new ContentWrapper(q.get(i).getAS_name(), q.get(i).getDesc_art(),null));
}

for (int i = 15; i < 236; i++) {
  if (!(q.get(i).getA_name().trim().equals(q.get(i-1).getA_name().trim()))) {

      mAdapter.addSeparatorItem(new ContentWrapper(q.get(i).getA_name(), null,null));

  }
  if(!(q.get(i).getExtra()==null))
      mAdapter.addGraySeparatorItem(new ContentWrapper(q.get(i).getExtra(),null,null));


  mAdapter.addItem(new ContentWrapper(q.get(i).getAS_name(), q.get(i).getDesc_art(),null));

    }
//Adapter Class
private class MyCustomAdapter extends BaseAdapter {

private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;
private static final int TYPE_GRAY_SEPARATOR = 2;
private static final int TYPE_MAX_COUNT = TYPE_GRAY_SEPARATOR + 1;

private TreeSet<Integer> mGraySeparatorsSet = new TreeSet<Integer>();

private ArrayList<ContentWrapper> mData = new ArrayList<ContentWrapper>();
private LayoutInflater mInflater;

private TreeSet<Integer> mSeparatorsSet = new TreeSet<Integer>();

public MyCustomAdapter(Context context)
{
    mInflater = LayoutInflater.from(context); 
}

public void addItem(ContentWrapper value) {
    mData.add(value);
    notifyDataSetChanged();
}

public void addSeparatorItem(ContentWrapper value) {
    mData.add(value);
    // save separator position
    mSeparatorsSet.add(mData.size() - 1);
    notifyDataSetChanged();
}

public void addGraySeparatorItem(ContentWrapper value) {
    mData.add(value);
    // save separator position
    mGraySeparatorsSet.add(mData.size() - 1);
    notifyDataSetChanged();
}   


public ContentWrapper getItem(int position) {
    return mData.get(position);
}
@Override
public int getItemViewType(int position) {
    int viewType = TYPE_ITEM;
    if(mSeparatorsSet.contains(position))
       viewType = TYPE_SEPARATOR;
    else if(mGraySeparatorsSet.contains(position)) {
       viewType = TYPE_GRAY_SEPARATOR; 
    }

    return viewType;
    // return mSeparatorsSet.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
}

@Override
public int getViewTypeCount() {
    return TYPE_MAX_COUNT;
}

public int getCount() {
    return mData.size();
}

public long getItemId(int position) {
    Log.v("getItemId Position", ""+position);
    return position;

}

public View getView(final int position, View convertView, ViewGroup parent) {
    ViewHolder holder = null;
    int type = getItemViewType(position);
    if (convertView == null) {
        holder = new ViewHolder();
        switch (type) {
        case TYPE_ITEM:
            convertView = mInflater.inflate(R.layout.white, null);
            holder.textView = (TextView)convertView.findViewById(R.id.text);
            break;
        case TYPE_SEPARATOR:
            convertView = mInflater.inflate(R.layout.black, null);
            holder.textView = (TextView)convertView.findViewById(R.id.textSeparator);
            break;
        case 2:
            convertView = mInflater.inflate(R.layout.gray, null);
            holder.textView = (TextView)convertView.findViewById(R.id.textViewGray);
            break;

        }
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder)convertView.getTag();
    } holder.textView.setText(mData.get(position).getItem());

    getListView().setFastScrollEnabled(true);
    if (type == TYPE_ITEM) {
        holder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) { // for printing details in alert dialog
                            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                    builder.setIcon(R.drawable.ic_launcher);
                    final String title = mData.get(position).getItem();
                    builder.setTitle(title);
                    builder.setMessage(mData.get(position).getItemDescription());
                    builder.setCancelable(false);
                    builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
                    AlertDialog alertDialog = builder.create();
                    alertDialog.setOnShowListener(new DialogInterface.OnShowListener() {
                        @Override
                        public void onShow(DialogInterface dialog) {
                            AlertDialog alertDialog = (AlertDialog) dialog;
                            ViewGroup viewGroup = (ViewGroup) alertDialog.getWindow()
                                    .getDecorView();
                            TextView textView = findTextViewWithTitle(viewGroup, title);
                            if (textView != null) {
                                textView.setEllipsize(null);
                                textView.setMaxHeight((int) (100 * alertDialog.getContext().getResources().getDisplayMetrics().density)); 
                                textView.setMovementMethod(new ScrollingMovementMethod());
                            }
                        }
                    });
                    alertDialog.show();
                }

                    //Customised Alert dialog 
                private TextView findTextViewWithTitle(ViewGroup viewGroup, String title) {
                    for (int i = 0, N = viewGroup.getChildCount(); i < N; i++) {
                        View child = viewGroup.getChildAt(i);
                        if (child instanceof TextView) {
                            TextView textView = (TextView) child;
                            if (textView.getText().equals(title)) {
                                return textView;
                            }
                        } else if (child instanceof ViewGroup) {
                            ViewGroup vGroup = (ViewGroup) child;
                            return findTextViewWithTitle(vGroup, title);
                        }
                    }
                    return null;
                }


            });
    }else if(type == 1) {
        holder.textView.setOnClickListener(null);
    }
    else
    {
        holder.textView.setOnClickListener(null);
    }

return convertView;
}
}
public static class ViewHolder {
public TextView textView;
public TextView header;
 int previousTop = 0;
}

public boolean onTouch(View v, MotionEvent event) {
return false;
}
}
}

enter image description here

正如你所看到的，有2种类型的标题（1种黑色和1种灰色），白色儿童。

黑色背景，灰色背景＆amp;白色背景所有sh是绿色背景的子视图（它是floatingGroupExpandableHeader）（相对布局id sample_activity_list_group_item_background）！ 1-30的视图属于第1部分，因此绿色背景文本是第1部分（floatingGroupExpandableHeader），其子项为1到30，无论天气如何，它都是黑色背景，灰色背景或白色背景！然后在视图31中，我想添加另一个带有文本作为第2部分的floatGroupExpandableHeader（来自31-60的子视图），我希望我想要实现的目标是明确的！

对于FloatingGroupExpandableListView，我的xml文件已准备好，我不想添加任何页眉或页脚，

sample_activity_list_group_item.xml

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



<RelativeLayout
    android:id="@+id/sample_activity_list_group_item_background"
    android:layout_width="0dp"
    android:layout_height="40dp"
    android:layout_gravity="center_vertical"
    android:layout_weight="1"
    android:background="#FFA2C955"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/sample_activity_list_group_item_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="20dp"
        android:textColor="#FFFFFFFF"
        android:textSize="20sp" />

    <ImageView
        android:id="@+id/sample_activity_list_group_expanded_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="20dp" />
</RelativeLayout>

</LinearLayout>

sample_activity.xml

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

<com.diegocarloslima.fgelv.lib.FloatingGroupExpandableListView
    android:id="@+id/sample_activity_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:cacheColorHint="@android:color/transparent"
    android:childDivider="#FF000000"
    android:divider="#FF000000"
    android:dividerHeight="1dp"
    android:paddingLeft="10dp"
    android:paddingTop="10dp" />

</LinearLayout>

现在我应该在课堂上添加/修改什么？

请帮助我，

提前致谢。

Answer 1

尝试FloatingGroupExpandableListView

我发现这是最好的实现。这使用反射来完成这项工作。只需要使用android GroupExpandableListView和BaseExpandableListAdapter。

List<ContentWrapper> items = new ArrayList<ContentWrapper>();
ContentWrapper group;
for (int i = 1; i <= 14; i++) {
  if (!(q.get(i).getA_name().trim().equals(q.get(i-1).getA_name().trim()))) {
    group = new ContentWrapper(q.get(i).getA_name(), null,null));
  }
  ContentWrapper item = new ContentWrapper(q.get(i).getAS_name(), q.get(i).getDesc_art(),null);
  if(!(q.get(i).getExtra()==null))
     item.setShowGraySeparator();//the gray separator should be merged with item view;
  items.add(item);
}
mAdapter.addGroup(group,items);

public class CustomExpandableListAdapter extends BaseExpandableListAdapter {

    private List<ContentWrapper> mGroups = new ArrayList<ContentWrapper>();
    private List<List<ContentWrapper>> mData = new ArrayList<List<ContentWrapper>>();

    public void addGroup(ContentWrapper group,List<ContentWrapper> items) {
        mGroups.add(group);
        mData.add(items);
    }

    @Override
    public int getGroupCount() {
        // sticky header count
        return mGroups.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        // child count for each group at 'groupPosition'
        mData.get(groupPosition).size();
    }        

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        //sticky header view at 'groupPosition'
        ContentWrapper header = mGroups.get(groupPosition);
        //show group view 
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
       //child view at 'childPosition' for 'groupPosition'
       ContentWrapper item = mData.get(groupPosition).get(childPosition);
       // show item view
    }

}

Answer 2

看看这个实现：https://github.com/beworker/pinned-section-listview 它要求您的适配器只使用一种方法实现接口：

public boolean isItemViewTypePinned(int viewType)

因此，您可以轻松地将此库集成到您的代码中。

在包含两种类型标头的列表视图中实现FloatingGroupExpandableListView

2 个答案: