android/src/org/d2df/app/CopyAssets.java

   1 package org.d2df.app;
   2
   3 import android.content.Context;
   4 import android.content.res.AssetManager;
   5
   6 import java.io.File;
   7 import java.io.FileOutputStream;
   8 import java.io.IOException;
   9 import java.io.InputStream;
  10 import java.io.OutputStream;
  11
  12 import android.util.Log;
  13
  14 public class CopyAssets {
  15
  16   public static void copyAssets(Context context, String prefix) {
  17     AssetManager assetManager = context.getAssets();
  18     String[] files = null;
  19     try {
  20         files = assetManager.list(prefix);
  21     } catch (IOException e) {
  22         Log.e("tag", "Failed to get asset file list.", e);
  23     }
  24     if (files != null) for (String filename : files) {
  25         InputStream in = null;
  26         OutputStream out = null;
  27         try {
  28           File f = new File(context.getExternalFilesDir(null), prefix);
  29           if (!f.exists()) {
  30             f.mkdirs();
  31           }
  32           File outFile = new File(context.getExternalFilesDir(null), prefix + "/" + filename);
  33           if (!outFile.exists()) {
  34             in = assetManager.open(prefix + "/" + filename);
  35             out = new FileOutputStream(outFile);
  36             copyFile(in, out);
  37           }
  38         } catch(IOException e) {
  39             Log.e("tag", "Failed to copy asset file: " + filename, e);
  40         }
  41         finally {
  42             if (in != null) {
  43                 try {
  44                     in.close();
  45                     in = null;
  46                 } catch (IOException e) {
  47
  48                 }
  49             }
  50             if (out != null) {
  51                 try {
  52                     out.flush();
  53                     out.close();
  54                     out = null;
  55                 } catch (IOException e) {
  56
  57                 }
  58             }
  59         }
  60     }
  61   }
  62
  63   public static void copyFile(InputStream in, OutputStream out) throws IOException {
  64     byte[] buffer = new byte[1024];
  65     int read;
  66     while((read = in.read(buffer)) != -1){
  67       out.write(buffer, 0, read);
  68     }
  69   }
  70
  71 }