自定义适配器浏览SD卡目录下的所有文件

如果在下载时需要更改下载文件的保存目录，或者浏览SD内的文件，如果不想单纯地用一个比较简单的listview来显示，做到有图标，有返回上一层目录，有返回根目录，那么自定义适配器可以很轻松的实现这一功能。

01       classMyAdapterextendsBaseAdapter {

02	privateLayoutInflater mInflater;

03	privateBitmap mIcon1;

04	privateBitmap mIcon2;

05	privateBitmap mIcon3;

06	privateBitmap mIcon4;

07	privateList<String> items;

08	privateList<String> paths;

09

10	publicMyAdapter(Context context, List<String> it, List<String> pa) {

11	mInflater = LayoutInflater.from(context);

12	items = it;

13	paths = pa;

14	mIcon1 = BitmapFactory.decodeResource(context.getResources(),

15	R.drawable.back01);

16	mIcon2 = BitmapFactory.decodeResource(context.getResources(),

17	R.drawable.back02);

18	mIcon3 = BitmapFactory.decodeResource(context.getResources(),

19	R.drawable.folder);

20	mIcon4 = BitmapFactory.decodeResource(context.getResources(),

21	R.drawable.doc);

22

}

23

24

@Override

25	publicintgetCount() {

26	// TODO Auto-generated method stub

27	returnitems.size();

28

}

29

30

@Override

31	publicObject getItem(intposition) {

32	// TODO Auto-generated method stub

33	returnitems.get(position);

34

}

35

36

@Override

37	publiclonggetItemId(intposition) {

38	// TODO Auto-generated method stub

39	returnposition;

40

}

41

42

@Override

43	publicView getView(intposition, View convertView, ViewGroup par) {

44	ViewHolder holder;

45	if(convertView ==null) {

46	convertView = mInflater.inflate(R.layout.file_row,null);

47	holder =newViewHolder();

48	holder.text = (TextView) convertView

49	.findViewById(R.id.txt_path);

50	holder.icon = (ImageView) convertView

51	.findViewById(R.id.icon_file_list1);

52	convertView.setTag(holder);

53

}else{

54	holder = (ViewHolder) convertView.getTag();

55

}

56	File f =newFile(paths.get(position).toString());

57	if(("b1").equals(items.get(position).toString())) {

58	holder.text.setText("Back to /");

59	holder.icon.setImageBitmap(mIcon1);

60	}elseif(("b2").equals(items.get(position).toString())) {

61	holder.text.setText("Back to ..");

62	holder.icon.setImageBitmap(mIcon2);

63

}else{

64	holder.text.setText(f.getName());

65	if(f.isDirectory()) {

66	holder.icon.setImageBitmap(mIcon3);

67

}else{

68	holder.icon.setImageBitmap(mIcon4);

69

}

70

}

71	returnconvertView;

72

}

73

74	publicfinalclassViewHolder {

75	publicTextView text;

76	publicImageView icon;

77

}

78

}