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里面有详细的文件浏览源代码。大家可以参考下。
不过可惜就是没有文件相关操作，我用了下File，不过对于createNewFile， mkdir等不成功，不知道是什么原因。

具体看源代码吧。
3GEYE(T6wxO gE/S4sL,c
package org.lombardos.android.FSExplorer1;

import java.io.File;
import java.util.ArrayList;3GEYEc0n Q;`/Y a
import java.util.List;

import android.app.AlertDialog;3GEYE%y Z0C$q~hPY(i
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class FileList extends ListActivity {
   
    private List<String> items = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.directory_list);
        fill(new File("/").listFiles());
    }
   
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        int selectionRowID = (int) getSelectionRowID();3GEYENmDu
c d;]L
        if (selectionRowID == 0) {
            fillWithRoot();
" l M5]2K e9t_3        } else {
            File file = new File(items.get(selectionRowID));3GEYE Q&nlmO-r_
            if (file.isDirectory())
                fill(file.listFiles());
            else
                AlertDialog.show(this, "Not a Directory",3GEYE VZ*?/a4{,r
                        "That's a file, not a directory", "Cancel", false);
        }
    }

k QUs@p3X H-[3    private void fillWithRoot() {
        fill(new File("/").listFiles());
    }

    private void fill(File[] files) {
)^R4a4Q tP%Bub3        items = new ArrayList<String>();
        items.add(getString(R.string.to_top));
        for (File file : files)
            items.add(file.getPath());
        ArrayAdapter<String> fileList = new ArrayAdapter<String>(this,3GEYE*Ty"E/HeN#C"X z
                R.layout.file_row, items);
gcf7W8pl3        setListAdapter(fileList);3GEYEnV d/zi I
    }
}

9A%ZB'w+q `fu3/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */3GEYEZTD }T1yap w

package org.lombardos.android.FSExplorer1;3GEYE C{${"[s }

public final class R {
!Ty w)I9j&U7[e3    public static final class attr {
    }
    public static final class drawable {
        public static final int icon=0x7f020000;
    }
    public static final class id {
        public static final int text1=0x7f050000;
"}4D s{vT}3    }
    public static final class layout {
        public static final int directory_list=0x7f030000;
        public static final int file_row=0x7f030001;
        public static final int main=0x7f030002;
    }
    public static final class string {
0s c Wj,q3        public static final int app_name=0x7f040000;
        public static final int no_files=0x7f040001;
        public static final int to_top=0x7f040002;
    }
}

顺便说下

对于File的操作需要具体的权限。

我在Data下面就不可以操作

对于tmp就可以

因为Android是采用linux系统的，所以目录结构下面应该有一个Home，大家可以把数据保存到这里