———————–main.java———————-
package com.example.filebrowser;import java.io.File;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.util.Log;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;public class MainActivity extends ActionBarActivity implements OnItemClickListener {private static final int IM_PARENT = Menu.FIRST + 1;private static final int IM_BACK = IM_PARENT + 1;ListView itemlist = null;String path = "/";List<Map<String, Object>> list;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);setTitle("文件浏览器");itemlist = (ListView) findViewById(R.id.itemlist);refreshListItems(path);}private void refreshListItems(String path) {setTitle("文件浏览器 > "+path);list = buildListForSimpleAdapter(path);SimpleAdapter notes = new SimpleAdapter(this, list, R.layout.file_row,new String[] { "name", "path" ,"img"}, new int[] { R.id.name,R.id.desc ,R.id.img});itemlist.setAdapter(notes);itemlist.setOnItemClickListener(this);itemlist.setSelection(0);}private List<Map<String, Object>> buildListForSimpleAdapter(String path) {File[] files = new File(path).listFiles();List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(files.length);Map<String, Object> root = new HashMap<String, Object>();root.put("name", "/");root.put("img", R.drawable.file_root);root.put("path", "go to root directory");list.add(root);Map<String, Object> pmap = new HashMap<String, Object>();pmap.put("name", "..");pmap.put("img", R.drawable.file_paranet);pmap.put("path", "go to paranet Directory");list.add(pmap);for (File file : files){Map<String, Object> map = new HashMap<String, Object>();if(file.isDirectory()){map.put("img", R.drawable.directory);}else{map.put("img", R.drawable.file_doc);}map.put("name", file.getName());map.put("path", file.getPath());list.add(map);}return list;}private void goToParent() {File file = new File(path);File str_pa = file.getParentFile();if(str_pa == null){Toast.makeText(MainActivity.this,"当前根目录了",Toast.LENGTH_SHORT).show();refreshListItems(path);}else{path = str_pa.getAbsolutePath();refreshListItems(path);}}@Overridepublic void onItemClick(AdapterView<?> parent, View v, int position, long id) {if (position == 0) {path = "/";refreshListItems(path);}else if(position == 1){goToParent();} else {path = (String) list.get(position).get("path");File file = new File(path);if (file.isDirectory())refreshListItems(path);elseToast.makeText(MainActivity.this,"当前最子目录",Toast.LENGTH_SHORT).show();}}}
.。。。。。。。。。。main.xml。。。。。。。。。。。。。。。
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=""android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><ListView android:layout_width="fill_parent"android:layout_height="fill_parent"android:id="@+id/itemlist" /></LinearLayout>
.。。。。。。。。。。。。。/res/layout/file_row.xml。。。。。。。。。
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="" android:id="@+id/vw1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="4px" android:orientation="horizontal"> <ImageView android:id="@+id/img" android:layout_width="32px" android:layout_margin="4px" android:layout_height="32px"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/name" android:textSize="18sp" android:textStyle="bold" android:layout_width="fill_parent" android:layout_height="wrap_content"/> <TextView android:id="@+id/desc" android:textSize="14sp" android:layout_width="fill_parent" android:paddingLeft="10px" android:layout_height="wrap_content"/> </LinearLayout></LinearLayout>
、、、、、、注意要加的权限！！！！！！！！、、、
如果说，罗马是一座厚重和凝固的堡垒，
