简单文件浏览器--实现简易文件选取返回路径功能

 1 public class DirEntry {
 2     private int icon;
 3     private String dirName;
 4     private String path;
 5 
 6     public String getPath() {
 7         return path;
 8     }
 9 
10     public void setPath(String path) {
11         this.path = path;
12     }
13 
14     public DirEntry(int icon, String path) {
15         this.icon = icon;
16         this.path=path;
17         this.dirName=new File(path).getName();
18     }
19 
20     public int getIcon() {
21         return icon;
22     }
23 
24     public void setIcon(int icon) {
25         this.icon = icon;
26     }
27 
28     public String getDirName() {
29         return dirName;
30     }
31 
32     public void setDirName(String dirName) {
33         this.dirName = dirName;
34     }
35 }

  1 public class MainActivity extends Activity {
  2 
  3     ArrayList<DirEntry> mDirEntries =new ArrayList<DirEntry>();
  4 
  5     @Override
  6     protected void onCreate(Bundle savedInstanceState) {
  7         super.onCreate(savedInstanceState);
  8         requestWindowFeature(Window.FEATURE_NO_TITLE);
  9         setContentView(R.layout.activity_main);
 10 
 11         init_list(getString(R.string.root_dir));
 12 
 13         final FileAdapter adapter=new FileAdapter(mDirEntries);
 14         final ListView listView=(ListView)findViewById(R.id.list);
 15 
 16         listView.setAdapter(adapter);
 17         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 18             @Override
 19             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 20 
 21                 DirEntry dirEntry =(DirEntry)listView.getAdapter().getItem(position);//获取点击的事件
 22 
 23                 if(!(new File(dirEntry.getPath()).isDirectory())){//当并非目录的时候返回文件名的绝对路径
 24                     System.out.println(dirEntry.getPath());
 25                     return;
 26                 }
 27 
 28                 mDirEntries.clear();
 29                 if(dirEntry.getDirName().equals(getString(R.string.last_dir))){//当获取的目录名称为上级目录的时候
 30                     File last=new File(dirEntry.getPath());
 31                     init_list(last.getParent());
 32                 }else {
 33                     init_list(dirEntry.getPath());
 34                 }
 35                 adapter.notifyDataSetChanged();
 36             }
 37         });
 38     }
 39 
 40     public void init_list(String arg){
 41         File[] root=new File(arg).listFiles();
 42         DirEntry dirEntry;
 43         if(!arg.equals(getString(R.string.root_dir))){
 44             //当目录并非根目录的时候，将第一个节点定义为上级目录,并将上级目录名定义为其绝对路径名，将显示的名称定义为上级目录
 45             dirEntry =new DirEntry(R.drawable.dir_last,arg);
 46             dirEntry.setDirName(getString(R.string.last_dir));
 47             mDirEntries.add(dirEntry);
 48         }
 49 
 50         if(root==null){
 51             return;
 52         }
 53 
 54         for(File dir1:root){
 55             if(dir1.isDirectory()){
 56                 dirEntry =new DirEntry(R.drawable.dir_blue,dir1.getAbsolutePath());
 57             }else {
 58                 dirEntry =new DirEntry(R.drawable.dir_file,dir1.getAbsolutePath());
 59             }
 60             mDirEntries.add(dirEntry);
 61         }
 62     }
 63 
 64     public class FileAdapter extends BaseAdapter{
 65 
 66 
 67         private ArrayList<DirEntry> mDirEntries =new ArrayList<DirEntry>();
 68         private LayoutInflater mLayoutInflater;
 69 
 70         public FileAdapter(ArrayList<DirEntry> dirEntries) {
 71             mDirEntries = dirEntries;
 72             mLayoutInflater=getLayoutInflater();
 73         }
 74 
 75         @Override
 76         public int getCount() {
 77             return mDirEntries.size();
 78         }
 79 
 80         @Override
 81         public DirEntry getItem(int position) {
 82             return mDirEntries.get(position);
 83         }
 84 
 85         @Override
 86         public long getItemId(int position) {
 87             return position;
 88         }
 89 
 90         @Override
 91         public View getView(int position, View convertView, ViewGroup parent) {
 92             if(convertView==null)
 93                 convertView=mLayoutInflater.inflate(R.layout.list_item,parent,false);
 94 
 95             DirEntry dirEntry =getItem(position);
 96 
 97             ImageView icon=(ImageView)convertView.findViewById(R.id.icon);
 98             TextView name=(TextView)convertView.findViewById(R.id.name);
 99 
100             icon.setImageResource(dirEntry.getIcon());
101             name.setText(dirEntry.getDirName());
102 
103             return convertView;
104         }
105     }
106 }