Android编写文件浏览器简单实现

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：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。