安卓文件管理器

【实例简介】

实验描述：

Android系统并不自带文件管理器，但是很多情况下，我们有从SD卡中打开文件的需要，怎么办？相信大家都比较习惯Windows下操作文件和文件夹的方式，那么Android下是否也有类似的工具呢？答案是必须有。本次实验我们将要开发的应用就是Android平台下的文件管理器。

基于Android平台的文件管理器，我们借鉴Windows，从用户实际使用需求出发，主要实现的功能有：

1)        浏览任意目录下的文件及文件夹

2)        打开文件

3)        新建文件

4)        删除文件

5)        复制文件

6)        对文件重命名

7)        在当前目录或者整个目录进行搜索

8)        返回上一级以及根目录。

【实例截图】

【核心代码】

 /**注册广播*/
    private IntentFilter filter;
    private FileBroadcast fileBroadcast;
    private IntentFilter intentFilter;
 private SearchBroadCast serviceBroadCast;
    @Override
    protected void onStart() {
     // TODO Auto-generated method stub
     super.onStart();
     filter = new IntentFilter();
     filter.addAction(FileService.FILE_SEARCH_COMPLETED);
     filter.addAction(FileService.FILE_NOTIFICATION);
     intentFilter = new IntentFilter();
  intentFilter.addAction(KEYWORD_BROADCAST);
     if(fileBroadcast == null){
      fileBroadcast = new FileBroadcast();
     }
     if(serviceBroadCast == null){
      serviceBroadCast = new SearchBroadCast();
     }
     this.registerReceiver(fileBroadcast, filter);
     this.registerReceiver(serviceBroadCast, intentFilter);
    }
   
    @Override
    protected void onDestroy() {
     // TODO Auto-generated method stub
     super.onDestroy();
     fileNames.clear();
  filePaths.clear();
     this.unregisterReceiver(fileBroadcast);
     this.unregisterReceiver(serviceBroadCast);
    }
   
    private String action;
    class FileBroadcast extends BroadcastReceiver{

  @Override
  public void onReceive(Context context, Intent intent) {
   // TODO Auto-generated method stub
   action = intent.getAction();
   
   if(FileService.FILE_SEARCH_COMPLETED.equals(action)){
    fileNames = intent.getStringArrayListExtra("fileNamesList");
    filePaths = intent.getStringArrayListExtra("filePathsList");
    Toast.makeText(MainActivity.this, "搜索完毕!", Toast.LENGTH_SHORT).show();
    //这里搜索完毕之后应该弹出一个弹出框提示用户要不要显示数据
    searchCompletedDialog("搜索完毕，是否马上显示结果?");
    getApplicationContext().stopService(serviceIntent);//当搜索完毕的时候停止服务，然后在服务中取消通知
   // 点击通知栏跳转过来的广播
   }else if(FileService.FILE_NOTIFICATION.equals(action)){//点击通知回到当前Activity，读取其中信息
    String mNotification = intent.getStringExtra("notification");
    Toast.makeText(MainActivity.this, mNotification, Toast.LENGTH_LONG).show();
    searchCompletedDialog("你确定要取消搜索吗?");
   }
   
  }
     
    }
   
  //搜索完毕和点击通知过来时的提示框
    private void searchCompletedDialog(String message){
  Builder searchDialog = new AlertDialog.Builder(MainActivity.this)
  .setTitle("提示")
  .setMessage(message)
  .setPositiveButton("确定", new OnClickListener(){
   public void onClick(DialogInterface dialog,int which) {
    //当弹出框时，需要对这个确定按钮进行一个判断，因为要对不同的情况做不同的处理（2种情况）
    // 1.搜索完毕
    // 2.取消搜索
    if(FileService.FILE_SEARCH_COMPLETED.equals(action)){
     if(fileNames.size() == 0){
         Toast.makeText(MainActivity.this, "无相关文件/文件夹!", Toast.LENGTH_SHORT).show();
         setListAdapter(new FileAdapter(MainActivity.this,fileNames,filePaths));//清空列表
        }else{
         //显示文件列表
         setListAdapter(new FileAdapter(MainActivity.this,fileNames,filePaths));
        }
    }else{
     //设置搜索标志为true，
     isComeBackFromNotification = true;
     //关闭服务，取消搜索
     getApplicationContext().stopService(serviceIntent);
    }
   }
  })
  .setNegativeButton("取消", null);
  searchDialog.create();
  searchDialog.show();
    }
   
    public void paste(){
     final String filePath1 = oriFilePath;
     final String filePath2 = currentPath File.separator oriFileName;
     if(isCopy&&!filePath1.equals(filePath2)){
      if(!new File(filePath2).exists()){
       copyFile(filePath1,filePath2);
       traversalFileList(currentPath);
      }else{
       OnClickListener listener = new OnClickListener() {
     @Override
     public void onClick(DialogInterface dialog, int which) {
      // TODO Auto-generated method stub
      copyFile(filePath1, filePath2);
      traversalFileList(currentPath);
      Toast.makeText(getApplicationContext(), "文件覆盖成功!", 1000).show();
     }
    };
    
    new AlertDialog.Builder(MainActivity.this)
        .setTitle("温馨提示")
        .setMessage("文件已经存在,是否覆盖?")
        .setPositiveButton("确定", listener)
        .setNeutralButton("取消", null).show();
      }
      
     }else{
      Toast.makeText(getApplicationContext(), "请先复制文件!", 1000).show();
     }
    }
   
    public void copyFile(String filePath1,String filePath2){
     try {
   FileInputStream fin = new FileInputStream(new File(filePath1));
   FileOutputStream fout = new FileOutputStream(new File(filePath2));
   
   int index;
   while((index = fin.read())!=-1){
    fout.write(index);
   }

   traversalFileList(currentPath);
   
   if(fin!=null){
    fin.close();
   }

   if(fout!=null){
    fout.close();
   }
   
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
    }
   
    public void createFile(){
     
     fileCheckedId = 2;
     
     final LayoutInflater ll = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     final LinearLayout layout = (LinearLayout)ll.inflate(R.layout.create_dialog,null);
     radioGroup1 = (RadioGroup)layout.findViewById(R.id.radioGroup1);
     final RadioButton createFileButton = (RadioButton)layout.findViewById(R.id.createFile);
     final RadioButton createFolderButton = (RadioButton)layout.findViewById(R.id.createFolder);
     
     createFolderButton.setChecked(true);
     
     radioGroup1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
   @Override
   public void onCheckedChanged(RadioGroup group, int checkedId) {
    // TODO Auto-generated method stub
    if(checkedId == createFileButton.getId()){
     fileCheckedId = 1;
    }else if(checkedId == createFolderButton.getId()){
     fileCheckedId = 2;
    }
   }
  });
     
     Builder builder = new AlertDialog.Builder(MainActivity.this)
     .setView(layout)
     .setTitle("新建")
     .setPositiveButton("创建", new OnClickListener() {
   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    fileNameEditText = (EditText)layout.findViewById(R.id.createFileName);
       createFileNameStr = fileNameEditText.getText().toString();
    if(fileCheckedId == 1){
     try {
      createFile = new File(currentPath File.separator createFileNameStr ".txt");
      createFile.createNewFile();
      traversalFileList(currentPath);
     } catch (IOException e) {
      // TODO Auto-generated catch block
      Toast.makeText(MainActivity.this, "文件拼接出错", 1000).show();
     }
    }else if(fileCheckedId == 2){
     createFile = new File(currentPath File.separator createFileNameStr);
     if(!createFile.exists()&&!createFile.isDirectory()&&createFileNameStr.length()!=0){
      if(createFile.mkdirs()){
       traversalFileList(currentPath);
      }else{
       Toast.makeText(MainActivity.this, "创建失败，可能是系统权限不够，root一下？！", 1000).show();
      }
     }else{
      Toast.makeText(MainActivity.this, "文件名为空，还是重名了呢？", 1000).show();
     }
    }
   }
  }).setNeutralButton("取消", null);
     builder.show();
    }