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分类: Java

2009-12-03 16:35:21

自己定制一个LinearLayout,可以让多个应用程序(当然,这几个应用具有相同的布局,但内容不一样)使用,好处是只需要用一个layout文件,里面的内容通过自己的定制的LinearLayout可以实现,具体说就是在构造LinearLayout时传入不同的参数。

 


import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
 
public class ListItemView extends LinearLayout {
      private static final int VIEW_NAME_IN_ITEM = R.id.com_listitem_text_name_id;
      private static final int VIEW_COMMENT_IN_ITEM = R.id.com_listitem_text_comment_id;
      private static final int VIEW_IMAGE_IN_ITEM = R.id.com_listitem_image_id;
 
      private TextView m_Name;
      private TextView m_Comment;
      private ImageView m_Image;
 
      public ListItemView(Context context, int LayoutID, String name, String comment, int image_id) {
            super(context);
            if (initialize(context, LayoutID)) {
                  SetItem(name, comment, image_id);
            }
      }
 
      public ListItemView(Context context, int LayoutID, String name, String comment, String imagePath) {
            super(context);
            if (initialize(context, LayoutID)) {
                  SetItem(name, comment, imagePath);
            }
      }
 
      private boolean initialize(Context context, int layoutID) {
            LayoutInflater layoutInflater = LayoutInflater.from(context);
            if (layoutInflater == null)
                  return false;
            
            View ItemView = layoutInflater.inflate(layoutID, this);
            if (ItemView == null)
                  return false;
            
            m_Image = (ImageView) ItemView.findViewById(VIEW_IMAGE_IN_ITEM);
            m_Name = (TextView) ItemView.findViewById(VIEW_NAME_IN_ITEM);
            m_Comment = (TextView) ItemView.findViewById(VIEW_COMMENT_IN_ITEM);
            if (m_Image == null || m_Name == null || m_Comment == null)
                  return false;
 
            m_Name.setTextColor(Color.WHITE);
            m_Comment.setTextColor(Color.GRAY);
            return true;
      }
 
      public void SetItem(String str_name, String str_comment, int iconID) {
            m_Name.setText(str_name);
            m_Comment.setText(str_comment);
            if (iconID > 0)
                  m_Image.setImageResource(iconID);
      }
 
      public void SetItem(String str_name, String str_comment, String iconPath) {
            m_Name.setText(str_name);
            m_Comment.setText(str_comment);
            if (iconPath != null && iconPath.length() != 0){
                  m_Image.setImageBitmap(BitmapFactory.decodeFile(iconPath));
            }else{
                  m_Image.setImageResource(R.drawable.globalsearchresultitem);
            }
      }
 
      public void SetEnable(boolean enable) {
            if (!enable) {
                  m_Name.setTextColor(Color.GRAY);
            } else {
                  m_Name.setTextColor(Color.WHITE);
            }
      }
}


这样就有了一个自己定制的view,但是究竟如何使用它呢?我们通过一个自定义的adaptor来解释一下:


public class ListItemAdaptor extends ArrayAdapter<PoiContent > {
      private int m_layout_res_id;
            public ListItemAdaptor(Context context,
                        int layout_res_id, int textview_id, List<PoiContent > lstItems)
            {
                  super(context, layout_res_id, textview_id,lstItems);
                  m_layout_res_id = layout_res_id;
            }
       public View getView(int position, View convertView, ViewGroup parent) {
            ListItemView ItemView;
            PoiContent item = getItem(position);
            String name = String.format("(%s) ", GetDistanceText(item.GetDistance())) + item.toString();
            String desc = ContentDisplay.GetContentDisplayDescription(item);
            String icon = mPoiCategoryConfig.GetPoiCategory(item.GetCategoryID()).GetIcon();
            if(item ==null) return null;
            if (convertView == null) {
                 ItemView = new ListItemView(getContext(),m_layout_res_id, name, desc, icon);
            }
            else
            {
                  ItemView = (ListItemView) convertView;
                  ItemView.SetItem(name, desc, icon);
            }
            ItemView.setTag(item );
            return ItemView;
        }
}


可以看到,在派生出来的ListItemAdaptorListItemAdaptor中,用到了我们前面自定义的ListItemView,并将其return给外界使用,它将成为后面要用到的listViewitemlayout

 

最后给我们的ListView set 我们定制的ListItemAdaptor:



lstView.setAdapter(new ListItemAdaptor(this,                                                                                   R.layout.searchresultlistviewitem,                                                                                   R.id.com_listitem_text_name_id,                                                                                   lstResultItems));


其中用到的list单行的layout如下:
layout.searchresultlistviewitem:

<LinearLayout xmlns:android=""
      android:orientation="horizontal"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:id="@+id/com_listitem_group">
      
      <ImageView android:id="@+id/com_listitem_image_id"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="5dip"
            android:layout_marginRight="5dip"/>
            
      <LinearLayout
            android:orientation="vertical"
            android:paddingRight="5dip"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content">
            
            <TextView android:id="@+id/com_listitem_text_name_id"
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:editable="false"
                  android:enabled="true"
                  android:singleLine="false"
                  android:textColor="@color/listview_item_title_color"
                  android:lineSpacingExtra="5dip"
                  android:textSize="18dip"></TextView>
            <TextView android:id="@+id/com_listitem_text_comment_id"
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:textSize="15dip"
                  android:editable="false"
                  android:enabled="true"
                  android:singleLine="false"
                  android:textColor="@color/listview_item_description_color">   

           </TextView>       

      </LinearLayout>
</LinearLayout>


最后再一起理一下整体思路,定制view,定制adaptor,ListView.setAdaptor(new OUR_ADAPTOR);
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