网络112 陈永森
下面是通过BaseAdapter类显示文件列表：
界面设计如下：
添加BaseAdapter类，里面的代码如下：
1 package com.cqvie;
2
3 import java.io.File;
4 import java.util.LinkedList;
5 import java.util.List;
6
7 import android.app.Activity;
8 import android.graphics.Bitmap;
9 import android.graphics.BitmapFactory;
10 import android.view.View;
11 import android.view.ViewGroup;
12 import android.widget.BaseAdapter;
13 import android.widget.ImageView;
14 import android.widget.TextView;
15
16 public class File_Adter extends BaseAdapter {
17 public Activity activity; //创建View时必须要提供Context
18 public List<File> list=new LinkedList<File>(); //数据源（文件列表）
19 public String currPath;//当前路径
20 private Bitmap bmp_folder,bmp_file;
21
22 public int getCount() {
23 // TODO Auto-generated method stub
24 return list.size();
25 }
26
27 public Object getItem(int arg0) {
28 // TODO Auto-generated method stub
29 return null;
30 }
31
32 public long getItemId(int position) {
33 // TODO Auto-generated method stub
34 return position;
35 }
36
37 public View getView(int position, View arg1, ViewGroup arg2) {
38 // TODO Auto-generated method stub
39 View v=View.inflate(activity,R.layout.item,null);
40 TextView Txt_Name=(TextView) v.findViewById(R.id.Txt_Name);
41 TextView Txt_Size=(TextView) v.findViewById(R.id.Txt_Size);
42 ImageView img=(ImageView) v.findViewById(R.id.image_ico);
43 File f=list.get(position);
44 Txt_Name.setText(f.getName());
45 Txt_Size.setText(getFilesSize(f));
46 if(f.isDirectory())
47 img.setImageBitmap(bmp_folder);
48 else
49 img.setImageBitmap(bmp_file);
50 return v;
51 }
52 public void scanFiles(String path)
53 {
54 list.clear();
55 File dir=new File(path);
56 File[] subFiles=dir.listFiles();
57 if(subFiles!=null)
58 for(File f:subFiles)
59 list.add(f);
60 this.notifyDataSetChanged();
61 currPath=path;
62 }
63 public File_Adter(Activity activity)
64 {
65 this.activity=activity;
66 bmp_folder=BitmapFactory.decodeResource(activity.getResources(),R.drawable.folder);//文件夹,decodeResource图片解码，source资源，解码为Bitmap类型；
67 bmp_file=BitmapFactory.decodeResource(activity.getResources(),R.drawable.file);//文件
68 }
FileListViewActivity里的代码如下：
package com.cqvie;
2
3 import java.io.File;
4
5 import android.app.Activity;
6 import android.os.Bundle;
7 import android.view.View;
8 import android.view.View.OnClickListener;
9 import android.widget.AdapterView;
10 import android.widget.AdapterView.OnItemClickListener;
11 import android.widget.Button;
12 import android.widget.ListView;
13 import android.widget.TextView;
14
15 public class File_listActivity extends Activity implements OnItemClickListener, OnClickListener {
16 /** Called when the activity is first created. */
17 @Override
18 public void onCreate(Bundle savedInstanceState) {
19 super.onCreate(savedInstanceState);
20 setContentView(R.layout.main);
21
22 List_View=(ListView) findViewById(R.id.List_View);
23 But_Up=(Button) findViewById(R.id.But_Up);
24 Txt_Path=(TextView) findViewById(R.id.Txt_Path);
25 File_Adter Adter=new File_Adter(this);
26 List_View.setAdapter(Adter);
27 List_View.setOnItemClickListener(this);
28 Adter.scanFiles("/");
29 But_Up.setOnClickListener(this);
30 }
31 ListView List_View;
32 TextView Txt_Path;
33 Button But_Up;
34 public void onClick(View v) {
35 // TODO Auto-generated method stub
36 File_Adter ad=(File_Adter) List_View.getAdapter();
37 if(ad.currPath.equals("/")) return;
38 File f=new File(ad.currPath);
39 Txt_Path.setText(f.getParent());
40 ad.scanFiles(f.getParent());
41
42 }
43 public void onItemClick(AdapterView<?> parent, View v, int positiong, long id) {
44 // TODO Auto-generated method stub
45 File_Adter da=(File_Adter) List_View.getAdapter();
46 File f=da.list.get(positiong);
47 if(f.isDirectory())
48 {
49 Txt_Path.setText(f.getPath());
50 da.scanFiles(f.getPath());
51 }
52 }
53 }
实现结果如下：
