主界面就是显示两个button，分别进入File与Cache的目录：

程序的架构为：

来看下主程序的代码：

public class FileCacheActivity extends Activity implements OnClickListener { private Button myButton1; private Button myButton2; private File cacheDir; private File fileDir; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); myButton1 = (Button) findViewById(R.id.myButton1); myButton2 = (Button) findViewById(R.id.myButton2); myButton1.setOnClickListener(this); myButton2.setOnClickListener(this); /** * 取得目前Cache目录 */ cacheDir = this.getCacheDir(); /** * 取得目前File目录 */ fileDir = this.getFilesDir(); } /* 调用EX05_16_1并将路径传入 */ private void showActivity(String path) { Intent intent = new Intent(); intent.setClass(FileCacheActivity.this, FileCacheListActivity.class); Bundle bundle = new Bundle(); bundle.putString("path", path); intent.putExtras(bundle); startActivity(intent); } @Override public void onClick(View v) { // TODO Auto-generated method stub int viewId = v.getId(); switch (viewId) { case R.id.myButton1: { String path = fileDir.getParent() + File.separator + fileDir.getName(); showActivity(path); break; } case R.id.myButton2: { String path = cacheDir.getParent() + File.separator + cacheDir.getName(); showActivity(path); break; } default: break; } } }

然后是显示listview的代码：

public class FileCacheListActivity extends Activity implements OnItemClickListener { private List items = null; private String path; private ListView listview; /** Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mylist); listview = (ListView) findViewById(R.id.list); listview.setOnItemClickListener(this); /** * 取得bundle */ Bundle bunde = this.getIntent().getExtras(); /** * 取得上一个页面传入bundle里的数据 */ path = bunde.getString("path"); this.setTitle(path); /** * 去一个新的文件目录用来显示目录里的所有文件 */ File file = new File(path); fill(file.listFiles());// 列出该路径下的所有文件 } private void fill(File[] files) { items = new ArrayList(); if (files == null) { return; } /* 取得文件名放入ArrayList */ for (File file : files) { items.add(file.getName()); } /* 将ArrayList放入ArrayAdapter */ ArrayAdapter fileList = new ArrayAdapter(this, android.R.layout.simple_list_item_1, items); listview.setAdapter(fileList); } @Override public void onItemClick(AdapterView> l, View v, int position, long id) { File file = new File(path + File.separator + items.get(position)); if (file.isDirectory()) { fill(file.listFiles()); } } }

最后再来两个xml文件

main.xml

mylist.xml

完了！