Android -- 官方下拉刷新SwipeRefreshLayout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ListView
            android:id="@+id/listview"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
    </android.support.v4.widget.SwipeRefreshLayout>

</RelativeLayout>

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listview);
        mSwipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe);
        
        list = new ArrayList<MyTextClass>();
    
        Map<String, String> maps = new HashMap<String, String>();
        maps.put("1", "2");
        
        myHandler = new MyHandler();
        
        client = new MyHttpClient(myHandler);
        
        myThread = new MyThread(client,"http://192.168.1.4/json/index.php",maps,GETJSON);
        
        myHandler.setThread(myThread);
        
        
        myHandler.setHandlerExtraHandleMessage(new MyHandler.HandlerExtraHandleMessage()
        {

            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                case GETJSON:
                    String strJson1 = (String) msg.obj;
                    Json json1 = new Json(strJson1);
                    try {
                        list = json1.getMyTextClass();
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                    myBaseAdapter = new MyBaseAdapter(MainActivity.this, list);
                    listView.setAdapter(myBaseAdapter);
                    break;
                case REFRESH:
                    String strJson2 = (String) msg.obj;
                    Json json2 = new Json(strJson2);
                    //list.clear();
                    try {
                        list = json2.getMyTextClass();
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                    
                    if(myBaseAdapter != null)
                    {
                        myBaseAdapter.setList(list);
                        myBaseAdapter.notifyDataSetChanged();
                    }
                    else
                    {
                        MyBaseAdapter myBaseAdapter2 = new MyBaseAdapter(MainActivity.this, list);
                        listView.setAdapter(myBaseAdapter2);
                    }
                    mSwipeLayout.setRefreshing(false);
                    break;

                default:
                    System.out.println("Other Message");
                    break;
                }
                super.handleMessage(msg);
            }
            
        });
        
        Map<String, String> maps2 = new HashMap<String, String>();
        maps.put("1", "2");
        MyRefreshListener myRefreshListener = new MyRefreshListener(myHandler, maps2, REFRESH);
        mSwipeLayout.setOnRefreshListener(myRefreshListener);
        mSwipeLayout.setColorScheme(android.R.color.holo_green_dark, android.R.color.holo_green_light,
                android.R.color.holo_orange_light, android.R.color.holo_red_light);

    }