android 用listview显示文件列表

清疚 2022-10-03 00:44 347阅读 0赞

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：

![22174820-860d63299a074158b1a551ac9c2b0c9f.jpg][] ![22174904-b28e8c41436a43ea9e34a4b51078dd9d.jpg][]

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：

![22175418-a101cc817b71495494c5fe0450c98fbe.jpg][]

转载于:https://www.cnblogs.com/chenyongsen/p/3149972.html

[22174820-860d63299a074158b1a551ac9c2b0c9f.jpg]: https://images0.cnblogs.com/blog/511899/201306/22174820-860d63299a074158b1a551ac9c2b0c9f.jpg
[22174904-b28e8c41436a43ea9e34a4b51078dd9d.jpg]: /images/20220109/0634f83e92cf4596be9c85e021bcfc8f.png
[22175418-a101cc817b71495494c5fe0450c98fbe.jpg]: /images/20220109/0d0d7b3d12134f8981b8d63d0522685c.png