[Android学习系列15]下拉刷新列表实现动态加载

package com.example.testwipe;

public class Book {
    
    int bookid;
    String bookname;
    String bookinfo;
    
    Book(int id, String name, String info) {
        this.bookid = id;
        this.bookname = name;
        this.bookinfo = info;
    }

}



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<?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="wrap_content"
    android:orientation="vertical"
    android:paddingBottom="10dp"    
     >
    
    <TextView 
        android:id="@+id/booktitle"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#6FB3E0"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:textColor="#fff"
        android:gravity="center"
        
        />
    
    <TextView 
        android:id="@+id/bookinfo"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:textColor="#0000EE"
        android:gravity="center"
        android:layout_below="@id/booktitle"
        />
    
   
</LinearLayout>

-------------------------------------------------------------------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".MainActivity" >
    
    
      
        <ListView  
            android:id="@+id/listview"  
            android:layout_width="fill_parent"  
            android:layout_height="fill_parent"
             >  
        </ListView>  
        
        
        <!--
            <android.support.v4.widget.SwipeRefreshLayout  
                android:id="@+id/swipe_refresh"  
                android:layout_width="match_parent"  
                android:layout_height="match_parent" >  
            </android.support.v4.widget.SwipeRefreshLayout> 

                -->

</LinearLayout>

---------------------------------------------------------------------------------
package com.example.testwipe;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

    
    public List<Book> listBooks;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        ListView listview = (ListView)findViewById(R.id.listview);
        listBooks = new ArrayList<Book>();
        
        listBooks.add( new Book(1, "呵呵", "介绍") );
        listBooks.add( new Book(2, "呵呵", "介绍") );
        listBooks.add( new Book(3, "呵呵", "介绍") );
        
        listview.setAdapter( new MyListAdapter(getApplicationContext())  );
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    
    class MyListAdapter extends BaseAdapter {
        
        Context context;
        ArrayList<View> listViews;
        
        public MyListAdapter( Context context ) {
            this.context = context;
            LayoutInflater inflater = LayoutInflater.from(context);
            
            
            
            //把book列表的每一个数据渲染进view，然后放进一个list里， 供getView返回
            listViews = new ArrayList<View>();
            for( Book book : listBooks )
            {
                View view = inflater.inflate(R.layout.list_one_item, null);
                TextView tv1 = (TextView)view.findViewById(R.id.booktitle);
                TextView tv2 = (TextView)view.findViewById(R.id.bookinfo);
                tv1.setText( String.valueOf(book.bookid) + " " +  book.bookname );
                tv2.setText( book.bookinfo );
                listViews.add(view);
            }
            
            
            
        }

        @Override
        public int getCount() {
            return listBooks.size();
        }

        @Override
        public Object getItem(int arg0) {
            return arg0;
        }

        @Override
        public long getItemId(int arg0) {
            return arg0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            
            return listViews.get(position);
        }
        
        
        
        
    }

}

View Code

好吧，没有骗到你，上面的代码只是一个很普通的listview

现在在libs文件夹导入 gson 和 android-async-http 的包

然后，不一一说明代码了，一大堆代码贴出来自己看啊

 1 package com.example.testwipe;
 2 
 3 public class Book {
 4     
 5     int bookid;
 6 
 7 
 8     String bookname;
 9     String bookinfo;
10     
11     public Book() {
12         
13     }
14 
15     
16     public int getBookid() {
17         return bookid;
18     }
19 
20     public void setBookid(int bookid) {
21         this.bookid = bookid;
22     }
23 
24     public String getBookname() {
25         return bookname;
26     }
27 
28     public void setBookname(String bookname) {
29         this.bookname = bookname;
30     }
31 
32     public String getBookinfo() {
33         return bookinfo;
34     }
35 
36     public void setBookinfo(String bookinfo) {
37         this.bookinfo = bookinfo;
38     }
39 }

book.java

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent"
 5     tools:context=".MainActivity" >
 6     
 7     <android.support.v4.widget.SwipeRefreshLayout  
 8                 android:id="@+id/swipe_refresh"  
 9                 android:layout_width="match_parent"  
10                 android:layout_height="match_parent" >  
11       
12         <ListView  
13             android:id="@+id/listview"  
14             android:layout_width="fill_parent"  
15             android:layout_height="fill_parent"
16              >  
17         </ListView>  
18         
19         
20     </android.support.v4.widget.SwipeRefreshLayout> 
21 
22 
23 
24 </LinearLayout>

activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="wrap_content"
 5     android:orientation="vertical"
 6     android:paddingBottom="10dp"    
 7      >
 8     
 9     <TextView 
10         android:id="@+id/booktitle"
11         android:layout_width="fill_parent"
12         android:layout_height="wrap_content"
13         android:background="#6FB3E0"
14         android:paddingTop="5dp"
15         android:paddingBottom="5dp"
16         android:textColor="#fff"
17         android:gravity="center"
18         
19         />
20     
21     <TextView 
22         android:id="@+id/bookinfo"
23         android:layout_width="fill_parent"
24         android:layout_height="wrap_content"
25         android:background="#fff"
26         android:paddingTop="5dp"
27         android:paddingBottom="5dp"
28         android:textColor="#0000EE"
29         android:gravity="center"
30         android:layout_below="@id/booktitle"
31         />
32     
33    
34 </LinearLayout>

list_one_item.xml

package com.example.testwipe;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.google.gson.Gson;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

public class MainActivity extends Activity {

    
    public ArrayList<Book> listBooks;
    private SwipeRefreshLayout swipeLayout;  
    public MyListAdapter myListAdapter;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //获得主界面的listview
        ListView listview = (ListView)findViewById(R.id.listview);
        listBooks = new ArrayList<Book>();
        
        //listBooks.add( new Book(1, "呵呵", "介绍") );
        //listBooks.add( new Book(2, "呵呵", "介绍") );
        //listBooks.add( new Book(3, "呵呵", "介绍") );
        
        //绑定适配器
        myListAdapter = new MyListAdapter(  getApplicationContext() , listBooks  );
        listview.setAdapter( myListAdapter );
        
        //建立一个swipeLayout
        swipeLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipe_refresh);  
        // 顶部刷新的样式  
        swipeLayout.setColorScheme(android.R.color.holo_red_light, android.R.color.holo_green_light,android.R.color.holo_blue_bright, android.R.color.holo_orange_light);  
        swipeLayout.setOnRefreshListener( new MyOnrefreshListener() );  
       
        
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    
    
    //监听器   下拉拖动列表时触发
    class MyOnrefreshListener implements OnRefreshListener {

        @Override
        public void onRefresh() {
            
            
            //用async http 发个请求
            AsyncHttpClient client = new AsyncHttpClient();
            RequestParams params = new RequestParams(); // 绑定参数
            params.put("key1", "1");       //这里参数随便写 因为我发请求的那个网址不解析参数的，只是做个例子  
            params.put("key2", "2");
            
            client.get("http://taobibi.kuphp.net/index1.php?", params, new AsyncHttpResponseHandler(){
            
                @Override
                @Deprecated
                public void onSuccess(String content) {
                    //因为返回了多个json  所以先把string 转成array
                    String [] stringArray = content.split("
");
                    
                    Gson gson = new Gson();
                    Book book;
                    for( String s : stringArray ) {
                        
                        //用Gson   把一个json字符串 解析成  对应的类的实例
                        book = gson.fromJson(s, Book.class);
                        //把实例放进listBooks里 (更新数据源)
                        listBooks.add(book);
                        Log.v( "mytag", book.bookinfo );
                        
                    }
                    
                    
                    //通知  界面的适配器  重新更新数据
                    myListAdapter.notifyDataSetChanged();
                    //更新完毕，停止swipeLayout的刷新动画
                    swipeLayout.setRefreshing(false);  
                    //Log.v("mytag", String.valueOf( listBooks.size() )  );    
                    
                }
                
            });
            
            
            
        
        }
        
        
    }
    

    
    
    class MyListAdapter extends BaseAdapter {
        
        Context context;
        ArrayList<View> listViews;
        ArrayList<Book> listBooks;
        LayoutInflater inflater;
        
        public MyListAdapter( Context context, ArrayList<Book> list ) {
            this.context = context;
            inflater = LayoutInflater.from(context);
            this.listBooks = list;
            
        }

        @Override
        public int getCount() {
            return listBooks.size();
        }

        @Override
        public Object getItem(int arg0) {
            return arg0;
        }

        @Override
        public long getItemId(int arg0) {
            return arg0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            
            //Log.v("mytag", String.valueOf( listBooks.size() ) );
            //   listBooks.size() - position - 1 是个关键
            //   保证最新的数据显示在界面的上方，所以要逆序生成view
             Book book = listBooks.get( listBooks.size() - position - 1  );
            View view = inflater.inflate(R.layout.list_one_item, null);
            TextView tv1 = (TextView)view.findViewById(R.id.booktitle);
            TextView tv2 = (TextView)view.findViewById(R.id.bookinfo);
            tv1.setText( String.valueOf(book.bookid) + " " +  book.bookname );
            tv2.setText( book.bookinfo );
            
            return view;
        }
        
        
        
        
    }

}

MainActivity.java

用PullToRefreshListView 还有点小问题没有解决

<?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" >  
      
<!--     The PullToRefreshListView replaces a standard ListView widget. -->  
    <com.handmark.pulltorefresh.library.PullToRefreshListView  
        android:id="@+id/pull_refresh_list"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        android:cacheColorHint="#00000000"  
        android:divider="#19000000"  
        android:dividerHeight="4dp"  
        android:fadingEdge="none"  
        android:fastScrollEnabled="false"  
        android:footerDividersEnabled="false"  
        android:headerDividersEnabled="false"  
        android:smoothScrollbar="true" />  
  
</LinearLayout>

main.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" >
    
    
    <TextView 
        android:id="@+id/textview1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />

</LinearLayout>

list_one_item.xml

package com.example.testpulltorefresh;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshBase.State;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

public class MainActivity extends Activity {

    
    public PullToRefreshListView  pullToRefreshListView;
    public ArrayList<String> listStrings;
    public MyAdapter myAdapter;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        
        listStrings = new ArrayList<String>();
        
        listStrings.add("asdasdasd");
        listStrings.add("asdasdasd");
        listStrings.add("asdasdasd");
        
        
        myAdapter =  new MyAdapter();
        //初始化pullToRefreshListView
        pullToRefreshListView = (PullToRefreshListView)findViewById(R.id.pull_refresh_list);
        //让pullToRefreshListView上下两端都可以刷新
        pullToRefreshListView.setMode(Mode.BOTH);
        //为pullToRefreshListView绑定适配器
        pullToRefreshListView.setAdapter( myAdapter );
        
        
        pullToRefreshListView.setOnRefreshListener( new OnRefreshListener<ListView>(){

            @Override
            public void onRefresh(PullToRefreshBase<ListView> refreshView) {
                
                 String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),  
                            DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);  
      
                 refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);  
                 
                //每一次刷新 增加三个string 
                listStrings.add("asdasdasd");
                listStrings.add("asdasdasd");
                listStrings.add("asdasdasd");
                 
                
                //通知适配器更新
                myAdapter.notifyDataSetChanged();
                
                
                pullToRefreshListView.onRefreshComplete();
                
            }
            

            
            
        });
    
    }
    
    
    
    
    class MyAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return listStrings.size();
        }

        @Override
        public Object getItem(int arg0) {
            return arg0;
        }

        @Override
        public long getItemId(int arg0) {
            return arg0;
        }

        @Override
        public View getView(int arg0, View arg1, ViewGroup arg2) {
            
            LayoutInflater inflator = (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View view = inflator.inflate(R.layout.list_one_item, null);
            TextView textView = (TextView)view.findViewById(R.id.textview1);
            textView.setText( listStrings.get(arg0) );
            
            return view;
        }
        
        
        
    }
    
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    
    
    
    

}

activity_main.java