Android编写文件浏览器简单实现

所属分类：软件编程 / Android 阅读数： 62

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有时候我们保存文件总会用到文件浏览器功能.那么今天博主带大家做一个。

那么开始,浏览文件,我们就需要写一个文件工具类。

import java.io.File; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
 
import android.util.Log; 
 
public class FileUtils { 
  /** 
   * 获取当前目录下的所有文件或文件夹 
   * @param path 路径 
   * @return 
   */ 
  public static List<Map<String,Object>> GetPathFilsList(String path) { 
    List<Map<String,Object>> list = new ArrayList<Map<String,Object>>(); 
    List<Map<String,Object>> filelist = new ArrayList<Map<String,Object>>(); 
    try { 
      String[] Files = new File(path).list(); 
      for(String file : Files){ 
        Map<String, Object> map = new HashMap<String, Object>(); 
        if(new File(path+file).isDirectory()){ 
          map.put("isDirectory",2); 
          map.put("fileName", file); 
           
          list.add(map); 
        }else { 
          map.put("isDirectory", 1); 
          map.put("fileName", file); 
           
          filelist.add(map); 
        } 
       
         
      } 
      list.addAll(filelist); 
      return list; 
    } catch (Exception e) { 
      // TODO: handle exception 
      e.printStackTrace(); 
      return null; 
    } 
  } 
}

这里会将文件和文件夹区分出来,便于显示区分。

之后我们需要用到一个适配器,用于显示这些数据的ListView

private class FileBrowserAdapter extends BaseAdapter{ 
    private List<Map<String, Object>> fileList; 
    private Context context; 
 
    public FileBrowserAdapter(Context Context, 
        List<Map<String, Object>> fileList) { 
      this.fileList = fileList; 
      this.context = context; 
    } 
 
    @Override 
    public int getCount() { 
      return fileList == null ? 0 : fileList.size(); 
    } 
 
    @Override 
    public Object getItem(int position) { 
      return fileList.get(position); 
    } 
 
    @Override 
    public long getItemId(int position) { 
      return position; 
    } 
 
    @SuppressLint("InflateParams") 
    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
 
      LayoutInflater mInflater = LayoutInflater 
          .from(getApplicationContext()); 
      View view = null; 
      view = mInflater.inflate(R.layout.file_list_item, null); 
      ImageView image = (ImageView) view 
          .findViewById(R.id.file_list_item_image); 
      if (Integer 
          .parseInt(fileList.get(position).get("isDirectory") + "") == 2) 
        image.setImageResource(R.drawable.folder); 
      else if (Integer.parseInt(fileList.get(position).get("isDirectory") 
          + "") == 1) 
        image.setImageResource(R.drawable.documents); 
      TextView textView = (TextView) view 
          .findViewById(R.id.file_list_item_testview); 
      textView.setTextColor(Color.BLACK); 
      textView.setText(fileList.get(position).get("fileName") + ""); 
      return view; 
 
    } 
   
  }

最后我们需要实现这些

dir = Environment.getExternalStorageDirectory() 
        .getAbsolutePath() + "/"; 
    fileListView = (ListView) findViewById(R.id.file_listview); 
    listItemClickListener = new FileListItemClickListener(); 
//   //设置点击事件 
    fileListView.setOnItemClickListener(listItemClickListener); 
    fileList = FileUtils.GetPathFilsList(dir); 
    if (new File(dir).getParent() != null) { 
      Map<String, Object> map = new HashMap<String, Object>(); 
      map.put("isDirectory", 0); 
      map.put("fileName", new File(dir).getParent()); 
      fileList.add(0, map); 
 
    } 
    FileBrowserAdapter phoneFileBrowserAdapter = new FileBrowserAdapter( 
        getApplicationContext(), fileList); 
    fileListView.setAdapter(phoneFileBrowserAdapter);

效果图：