转换Android的文件浏览器ListActivity例如成片段

Question

我试图想出一个办法的片段用这个例子： http://sampleprogramz.com/android/browse.php

我已经改变了onCreate方法的OnCreateView方法，并试图纠正任何Android Studio标记的错误，但我似乎无法得到它的工作。

下面是代码：

import java.io.File; 
import java.io.FilenameFilter; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.Comparator; 
import java.util.List; 
import android.app.ListActivity; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.ListFragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.TextView; 

import static android.app.Activity.RESULT_OK; 

public class FilePicker extends ListFragment { 

    public final static String EXTRA_FILE_PATH = "file_path"; 
    public final static String EXTRA_SHOW_HIDDEN_FILES = "show_hidden_files"; 
    public final static String EXTRA_ACCEPTED_FILE_EXTENSIONS = "accepted_file_extensions"; 
    private final static String DEFAULT_INITIAL_DIRECTORY = "/"; 

    protected File Directory; 
    protected ArrayList<File> Files; 
    protected FilePickerListAdapter Adapter; 
    protected boolean ShowHiddenFiles = false; 
    protected String[] acceptedFileExtensions; 


    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

     View emptyView = inflater.inflate(R.layout.empty_view, container, false); 
     ((ViewGroup) getListView().getParent()).addView(emptyView); 
     getListView().setEmptyView(emptyView); 

     // Set initial directory 
     Directory = new File(DEFAULT_INITIAL_DIRECTORY); 

     // Initialize the ArrayList 
     Files = new ArrayList<File>(); 

     // Set the ListAdapter 
     Adapter = new FilePickerListAdapter(getActivity(), Files); 
     setListAdapter(Adapter); 

     // Initialize the extensions array to allow any file extensions 
     acceptedFileExtensions = new String[] {".rc"}; 

     // Get intent extras 
     if(getActivity().getIntent().hasExtra(EXTRA_FILE_PATH)) 
      Directory = new File(getActivity().getIntent().getStringExtra(EXTRA_FILE_PATH)); 

     if(getActivity().getIntent().hasExtra(EXTRA_SHOW_HIDDEN_FILES)) 
      ShowHiddenFiles = getActivity().getIntent().getBooleanExtra(EXTRA_SHOW_HIDDEN_FILES, false); 

     if(getActivity().getIntent().hasExtra(EXTRA_ACCEPTED_FILE_EXTENSIONS)) { 

      ArrayList<String> collection = 
        getActivity().getIntent().getStringArrayListExtra(EXTRA_ACCEPTED_FILE_EXTENSIONS); 

      acceptedFileExtensions = (String[]) 
        collection.toArray(new String[collection.size()]); 
     } 
     return emptyView; 
    } 

    @Override 
    public void onResume() { 
     refreshFilesList(); 
     super.onResume(); 
    } 

    protected void refreshFilesList() { 

     Files.clear(); 
     ExtensionFilenameFilter filter = 
       new ExtensionFilenameFilter(acceptedFileExtensions); 

     File[] files = Directory.listFiles(filter); 

     if(files != null && files.length > 0) { 

      for(File f : files) { 

       if(f.isHidden() && !ShowHiddenFiles) { 

        continue; 
       } 

       Files.add(f); 
      } 

      Collections.sort(Files, new FileComparator()); 
     } 

     Adapter.notifyDataSetChanged(); 
    } 



    public void onListItemClick(ListView l, View v, int position, long id) { 

     File newFile = (File)l.getItemAtPosition(position); 

     if(newFile.isFile()) { 

      Intent extra = new Intent(); 
      extra.putExtra(EXTRA_FILE_PATH, newFile.getAbsolutePath()); 
      getActivity().setResult(RESULT_OK, extra); 
      getActivity().finish(); 
     } 
     else { 

      Directory = newFile; 
      refreshFilesList(); 
     } 

     super.onListItemClick(l, v, position, id); 
    } 

    private class FilePickerListAdapter extends ArrayAdapter<File> { 

     private List<File> mObjects; 

     public FilePickerListAdapter(Context context, List<File> objects) { 

      super(context, R.layout.list_item, android.R.id.text1, objects); 
      mObjects = objects; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 

      View row = null; 

      if(convertView == null) { 

       LayoutInflater inflater = (LayoutInflater) 
         getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

       row = inflater.inflate(R.layout.list_item, parent, false); 
      } 
      else 
       row = convertView; 

      File object = mObjects.get(position); 

      ImageView imageView = (ImageView)row.findViewById(R.id.file_picker_image); 
      TextView textView = (TextView)row.findViewById(R.id.file_picker_text); 
      textView.setSingleLine(true); 
      textView.setText(object.getName()); 

      if(object.isFile()) 
       imageView.setImageResource(R.drawable.sound); 

      else 
       imageView.setImageResource(R.drawable.folder); 

      return row; 
     } 
    } 

    private class FileComparator implements Comparator<File> { 

     public int compare(File f1, File f2) { 

      if(f1 == f2) 
       return 0; 

      if(f1.isDirectory() && f2.isFile()) 
       // Show directories above files 
       return -1; 

      if(f1.isFile() && f2.isDirectory()) 
       // Show files below directories 
       return 1; 

      // Sort the directories alphabetically 
      return f1.getName().compareToIgnoreCase(f2.getName()); 
     } 
    } 

    private class ExtensionFilenameFilter implements FilenameFilter { 

     private String[] Extensions; 

     public ExtensionFilenameFilter(String[] extensions) { 

      super(); 
      Extensions = extensions; 
     } 

     public boolean accept(File dir, String filename) { 

      if(new File(dir, filename).isDirectory()) { 

       // Accept all directory names 
       return true; 
      } 

      if(Extensions != null && Extensions.length > 0) { 

       for(int i = 0; i < Extensions.length; i++) { 

        if(filename.endsWith(Extensions[i])) { 

         // The filename ends with the extension 
         return true; 
        } 
       } 
       // The filename did not match any of the extensions 
       return false; 
      } 
      // No extensions has been set. Accept all file extensions. 
      return true; 
     } 
    } 
} 

感谢。

Answer 1

我能得到它的工作通过为filepicker片段充气一个新的XML布局，

我代替：

View emptyView = inflater.inflate(R.layout.empty_view, container, false); 
    ((ViewGroup) getListView().getParent()).addView(emptyView); 
    getListView().setEmptyView(emptyView); 

    // Set initial directory 
    Directory = new File(DEFAULT_INITIAL_DIRECTORY); 

    // Initialize the ArrayList 
    Files = new ArrayList<File>(); 

    // Set the ListAdapter 
    Adapter = new FilePickerListAdapter(getActivity(), Files); 
    setListAdapter(Adapter); 

有了：

View viewlist = inflater.inflate(R.layout.file_picker, container, false);  
lv = (ListView) viewlist.findViewById(R.id.filebrowselist); 

    // Set initial directory 
    Directory = new File(String.valueOf(DEFAULT_INITIAL_DIRECTORY)); 

    // Initialize the ArrayList 
    Files = new ArrayList<File>(); 


    // Set the ListAdapter 
    Adapter = new FilePickerListAdapter(getActivity(), Files); 
    lv.setAdapter(Adapter);