可拖拽的listView

在packages/apps/Music/src/touchIncepter.java中

该类提供了listview的拖动效果，并提供接口，在程序接口中实现数据的交换即可。

packagecom.and.DragListview;
importjava.util.ArrayList;
importjava.util.List;
importandroid.app.ListActivity;
importandroid.content.Context;
importandroid.os.Bundle;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.BaseAdapter;
importandroid.widget.ImageView;
importandroid.widget.TextView;
publicclassDragListviewextendsListActivity{
MyAdapteradapter;
TouchInterceptorlist;
List<String>arrayText;

@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

list=(TouchInterceptor)getListView();//(TouchInterceptor)findViewById(android.R.id.list);
getText();

adapter=newMyAdapter(this);
setListAdapter(adapter);

list.setDropListener(mDropListener);
//list.setRemoveListener(mRemoveListener);
}
publicvoidgetText(){
arrayText=newArrayList<String>();
arrayText.add("传奇");
arrayText.add("红豆");
arrayText.add("流年");
arrayText.add("棋子");
}

//交换listview的数据
privateTouchInterceptor.DropListenermDropListener=
newTouchInterceptor.DropListener(){
publicvoiddrop(intfrom,intto){
Stringitem=arrayText.get(from);
arrayText.remove(item);//.remove(from);
arrayText.add(to,item);
adapter.notifyDataSetChanged();
}
};

privateTouchInterceptor.RemoveListenermRemoveListener=
newTouchInterceptor.RemoveListener(){
publicvoidremove(intwhich){
}
};

classMyAdapterextendsBaseAdapter{
privateLayoutInflatermInflater;
ContextmContext;
publicMyAdapter(Contextc){
mInflater=LayoutInflater.from(c);
}
publicintgetCount(){
returnarrayText.size();
}
publicObjectgetItem(intarg0){
returnarrayText.get(arg0);
}
publiclonggetItemId(intarg0){
returnarg0;
}
publicViewgetView(intarg0,ViewcontentView,ViewGrouparg2){
ImageViewimg;
TextViewtext;
if(contentView==null){
contentView=mInflater.inflate(R.layout.list_layout,null);
//contentView=mInflater.inflate(R.layout.list_layout,null);
}
img=(ImageView)contentView.findViewById(R.id.img);
img.setBackgroundResource(R.drawable.icon);
text=(TextView)contentView.findViewById(R.id.text);
text.setText(arrayText.get(arg0).toString());

returncontentView;
}

}
}