Android中GridView滚动到底部加载数据终极版

<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:background="@android:color/white" >  
  
    <ScrollView  
        android:id="@+id/MainGridViewScroll"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:fadingEdge="none"  
        android:fillViewport="true"  
        android:scrollbars="none" >  
  
        <LinearLayout  
            android:id="@+id/MainGridViewScrollLinear"  
            android:layout_width="fill_parent"  
            android:layout_height="wrap_content"  
            android:gravity="left|top"  
            android:orientation="vertical" >  
  
            <com.sixsix.swordsman.grid.MyGridView  
                android:id="@+id/MainGridViewGrid"  
                android:layout_width="fill_parent"  
                android:layout_height="wrap_content"  
                android:fadingEdge="none"  
                android:horizontalSpacing="5dp"  
                android:listSelector="#00000000"  
                android:numColumns="2"  
                android:padding="5dp"  
                android:scrollbars="none"  
                android:verticalSpacing="5dp" />  
  
            <RelativeLayout  
                android:layout_width="fill_parent"  
                android:layout_height="wrap_content" >  
  
                <TextView  
                    android:layout_width="fill_parent"  
                    android:layout_height="50dp"  
                    android:background="#00000000" />  
  
                <LinearLayout  
                    android:id="@+id/MainGridViewFooterLinear"  
                    android:layout_width="fill_parent"  
                    android:layout_height="50dp"  
                    android:gravity="center"  
                    android:orientation="horizontal"  
                    android:padding="10dp" >  
  
                    <com.ant.liao.GifView  
                        android:id="@+id/MainGridViewFooterGif"  
                        android:layout_width="wrap_content"  
                        android:layout_height="wrap_content"  
                        android:enabled="false" />  
  
                    <TextView  
                        android:layout_width="wrap_content"  
                        android:layout_height="fill_parent"  
                        android:layout_marginLeft="5dp"  
                        android:gravity="center_vertical"  
                        android:text="正在加载..."  
                        android:textColor="@android:color/black"  
                        android:textSize="18sp" />  
                </LinearLayout>  
            </RelativeLayout>  
        </LinearLayout>  
    </ScrollView>  
  
</RelativeLayout>

sv.setOnTouchListener(new OnTouchListener() {  
              
            private int lastY = 0;  
          
            @Override  
            public boolean onTouch(View v, MotionEvent event) {  
                  
                if(event.getAction() == MotionEvent.ACTION_UP){  
                    lastY = sv.getScrollY();  
                    if(lastY == (ll.getHeight() - sv.getHeight())){  
                        LLF.setVisibility(View.VISIBLE);  
                        addMoreData();  
                    }  
                }  
                return false;  
            }  
        });

private void addMoreData(){  
        new Thread(new Runnable(){  
  
            @Override  
            public void run() {  
                Bundle b = new Bundle();  
                try{  
                    Thread.sleep(2000);  
                    b.putBoolean("addMoreData", true);  
                }catch(Exception e){}finally{  
                    Message msg = handler.obtainMessage();  
                    msg.setData(b);  
                    handler.sendMessage(msg);  
                }  
            }}).start();  
    }