NotePad学习笔记二
根据学习笔记一完成一些代码，贴出来看看：
Notepad.java
package com.example.notepad;import java.io.File;import java.io.FileInputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.TextView;import android.widget.Toast;// TODO: Auto-generated Javadoc/** * The Class OpenNote. */public class OpenNote extends Activity { /** Called when the activity is first created. */ private ListView listview; /** The items. */ private ArrayList<String> items = null; /** The paths. */ private ArrayList<String> paths = null; /** The root path. */ private String rootPath = "/"; // 根目录 /** The m path. */ private TextView mPath; // 当前路径 /** The currentpath. */ String currentpath; /** The list items. */ private List<Map<String, Object>> listItems = null; /* (non-Javadoc) * @see android.app.Activity#onCreate(android.os.Bundle) */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.open_note); init(); getFileDir(rootPath); } /** * Gets the file dir. * * @param filePath the file path * @return the file dir */ private void getFileDir(String filePath) { mPath.setText("当前目录：" + filePath); currentpath = filePath; List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>(); items = new ArrayList<String>(); paths = new ArrayList<String>(); File f = new File(filePath); File[] files = f.listFiles(); Map<String, Object> listItem = new HashMap<String, Object>(); if (!filePath.equals(rootPath)) { items.add("cd /"); paths.add(rootPath); items.add("cd .."); paths.add(f.getParent()); listItem.put("header", R.drawable.back01); listItem.put("name", "cd /"); listItems.add(listItem); Map<String, Object> listItem1 = new HashMap<String, Object>(); listItem1.put("header", R.drawable.back02); listItem1.put("name", "cd .."); listItems.add(listItem1); } for (int i = 0; i < files.length; i++) { Map<String, Object> listItem2 = new HashMap<String, Object>(); File file = files[i]; items.add(file.getName()); paths.add(file.getPath()); if (file.isDirectory()) { listItem2.put("header", R.drawable.folder); } else { String pathStr = file.getAbsolutePath(); if (pathStr .matches("[^\\S]+(\\.avi|\\.mp4|\\.rmvb)$")) { listItem2.put("header", R.drawable.video); } else if (pathStr.matches("[^\\S]+(\\.asv|\\.mp3)$")) { listItem2.put("header", R.drawable.audio); } else if (pathStr .matches("[^\\S]+(\\.jpg|\\.png|\\.gif)$")) { listItem2.put("header", R.drawable.image); } else { listItem2.put("header", R.drawable.doc); } } listItem2.put("name", file.getName()); listItems.add(listItem2); } String[] from = { "header", "name" }; int[] to = { R.id.header, R.id.name }; SimpleAdapter adapter = new SimpleAdapter(this, listItems, R.layout.file_row, from, to); listview.setAdapter(adapter); } /** * Inits the. */ public void init() { listview = (ListView) findViewById(R.id.file_listview); mPath = (TextView) findViewById(R.id.current_path); listview.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) { File file = new File(paths.get(position)); if (file.canRead()) { if (file.isDirectory()) { getFileDir(paths.get(position)); } else { String data = "fail"; try { FileInputStream stream = new FileInputStream( paths.get(position)); StringBuffer sb = new StringBuffer(); int c; while ((c = stream.read()) != -1) { sb.append((char) c); } stream.close(); data = sb.toString(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } Intent i = getIntent(); i.putExtra("data", data); setResult(RESULT_OK, i); finish(); } } else { Toast toast = Toast.makeText(OpenNote.this, "您的权限不足！", Toast.LENGTH_LONG); toast.show(); } } }); } /* (non-Javadoc) * @see android.app.Activity#onKeyDown(int, android.view.KeyEvent) */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == event.KEYCODE_BACK) { if (currentpath == rootPath) { File f = new File(currentpath); getFileDir(currentpath); } else { File f = new File(currentpath); getFileDir(f.getParent()); } } return super.onKeyDown(keyCode, event); }}