Android 将 assets 中的文件复制到外置 sdcard 卡

Android 将assets中的文件复制到外置sdcard卡

在assets文件夹中的文件的访问是通过

  InputStream inputStream = context.getAssets().open("FileName");

列出assets中某个目录下的所有的文件及文件夹

  String[] srcFiles = context.getAssets().list("assetsPath");

如 assets/folder/文件夹中所有的文件

  String[] srcFiles = context.getAssets().list("folder");

将assets中某个文件夹的文件复制到外置sdcard中

核心代码如下：

  package com.android.example.assets;
  import android.content.Context;
  import android.util.Log;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;

  public class Utils{
      public static void doCopy(Context context, String assetsPath, String desPath) throws IOException {
          String[] srcFiles = context.getAssets().list(assetsPath);//for directory
          for (String srcFileName : srcFiles) {
              String outFileName = desPath + File.separator + srcFileName;
              String inFileName = assetsPath + File.separator + srcFileName;
              if (assetsPath.equals("")) {// for first time
                  inFileName = srcFileName;
              }
              Log.e("tag","========= assets: "+ assetsPath+"  filename: "+srcFileName +" infile: "+inFileName+" outFile: "+outFileName);
              try {
                  InputStream inputStream = context.getAssets().open(inFileName);
                  copyAndClose(inputStream, new FileOutputStream(outFileName));
              } catch (IOException e) {//if directory fails exception
                  e.printStackTrace();
                  new File(outFileName).mkdir();
                  doCopy(context,inFileName, outFileName);
              }
          }
      }

      private static void closeQuietly(OutputStream out){
          try{
              if(out != null) out.close();;
          }catch (IOException ex){
              ex.printStackTrace();
          }
      }

      private static void closeQuietly(InputStream is){
          try{
              if(is != null){
                  is.close();
              }
          }catch (IOException ex){
              ex.printStackTrace();
          }
      }

      private static void copyAndClose(InputStream is, OutputStream out) throws IOException{
          copy(is,out);
          closeQuietly(is);
          closeQuietly(out);
      }

      private static void copy(InputStream is, OutputStream out) throws IOException{
          byte[] buffer = new byte[1024];
          int n = 0;
          while(-1 != (n = is.read(buffer))){
              out.write(buffer,0,n);
          }
      }
  }

工程源码