resource/csdk/connectivity/samples/android/casample/sampleService/src/main/java/org/iotivity/ca/service/FileChooser.java

   1 package org.iotivity.ca.service;
   2
   3 import android.app.Activity;
   4 import android.app.Dialog;
   5 import android.os.Environment;
   6 import android.view.View;
   7 import android.view.ViewGroup;
   8 import android.view.WindowManager.LayoutParams;
   9 import android.widget.AdapterView;
  10 import android.widget.ArrayAdapter;
  11 import android.widget.ListView;
  12 import android.widget.TextView;
  13 import java.io.File;
  14 import java.io.FileFilter;
  15 import java.util.Arrays;
  16
  17 public class FileChooser {
  18     private static final String PARENT_DIR = "..";
  19
  20     private final Activity activity;
  21     private ListView list;
  22     private Dialog dialog;
  23     private File currentPath;
  24
  25     // filter on file extension
  26     private String extension = null;
  27     public void setExtension(String extension) {
  28         this.extension = (extension == null) ? null :
  29                 extension.toLowerCase();
  30     }
  31
  32     // file selection event handling
  33     public interface FileSelectedListener {
  34         void fileSelected(File file);
  35     }
  36     public FileChooser setFileListener(FileSelectedListener fileListener) {
  37         this.fileListener = fileListener;
  38         return this;
  39     }
  40     private FileSelectedListener fileListener;
  41
  42     public FileChooser(Activity activity) {
  43         this.activity = activity;
  44         dialog = new Dialog(activity);
  45         list = new ListView(activity);
  46         list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
  47             @Override public void onItemClick(AdapterView<?> parent, View view, int which, long id) {
  48                 String fileChosen = (String) list.getItemAtPosition(which);
  49                 File chosenFile = getChosenFile(fileChosen);
  50                 if (chosenFile.isDirectory()) {
  51                     refresh(chosenFile);
  52                 } else {
  53                     if (fileListener != null) {
  54                         fileListener.fileSelected(chosenFile);
  55                     }
  56                     dialog.dismiss();
  57                 }
  58             }
  59         });
  60         dialog.setContentView(list);
  61         dialog.getWindow().setLayout(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
  62         refresh(Environment.getExternalStorageDirectory());
  63     }
  64
  65     public void showDialog() {
  66         dialog.show();
  67     }
  68
  69
  70     /**
  71      * Sort, filter and display the files for the given path.
  72      */
  73     private void refresh(File path) {
  74         this.currentPath = path;
  75         if (path.exists()) {
  76             File[] dirs = path.listFiles(new FileFilter() {
  77                 @Override public boolean accept(File file) {
  78                     return (file.isDirectory() && file.canRead());
  79                 }
  80             });
  81             File[] files = path.listFiles(new FileFilter() {
  82                 @Override public boolean accept(File file) {
  83                     if (!file.isDirectory()) {
  84                         if (!file.canRead()) {
  85                             return false;
  86                         } else if (extension == null) {
  87                             return true;
  88                         } else {
  89                             return file.getName().toLowerCase().endsWith(extension);
  90                         }
  91                     } else {
  92                         return false;
  93                     }
  94                 }
  95             });
  96
  97             // convert to an array
  98             int i = 0;
  99             String[] fileList;
 100             if (path.getParentFile() == null) {
 101                 fileList = new String[dirs.length + files.length];
 102             } else {
 103                 fileList = new String[dirs.length + files.length + 1];
 104                 fileList[i++] = PARENT_DIR;
 105             }
 106             Arrays.sort(dirs);
 107             Arrays.sort(files);
 108             for (File dir : dirs) { fileList[i++] = dir.getName(); }
 109             for (File file : files ) { fileList[i++] = file.getName(); }
 110
 111             // refresh the user interface
 112             dialog.setTitle(currentPath.getPath());
 113             list.setAdapter(new ArrayAdapter(activity,
 114                    android.R.layout.simple_list_item_1, fileList) {
 115                        @Override public View getView(int pos, View view, ViewGroup parent) {
 116                            view = super.getView(pos, view, parent);
 117                            ((TextView) view).setSingleLine(true);
 118                            return view;
 119                        }
 120                    });
 121         }
 122     }
 123
 124
 125     /**
 126      * Convert a relative filename into an actual File object.
 127      */
 128     private File getChosenFile(String fileChosen) {
 129         if (fileChosen.equals(PARENT_DIR)) {
 130             return currentPath.getParentFile();
 131         } else {
 132             return new File(currentPath, fileChosen);
 133         }
 134     }
 135 }