android assets/raw 大文件读取

最新推荐文章于 2024-04-06 08:47:49 发布

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本文讨论了在Android中处理大型文件时的优化策略，包括修改文件名后缀以防止压缩，使用ZipInputStream从zip文件中读取以节省空间，以及将大文件分割成多个小块进行读写。

ref to http://stackoverflow.com/questions/2860157/load-files-bigger-than-1m-from-assets-folder
android read/copy big size file in asset/raw:
1.change filename's sufix to mp3 to prevent the compress for the file.

2.For some file, if zip can save much size, zip it first then using "ZipInputStream" to read it.
    InputStream dbIn = getAssets().open("my.zip");
    ZipInputStream zis = new ZipInputStream(dbIn);
    this have the limit that most time, the zipped file still too large.

3.split the files into multi small blocks and read/write them into one. Many split tools like hjsplit.
        FileOutputStream dbOut = new FileOutputStream(dbFile.getAbsolutePath());
        for (int i = 1; i < 11; i++) {
            // source file open
            String fn = String.format("resource.irf.d", i);
            InputStream dbIn = getAssets().open(fn);
            copyFile(dbIn, dbOut);
            dbIn.close();
        }
        dbOut.close();

helpers to copy file:
    private void copyFile(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int read;
        while ((read = in.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
    }
    private void copyFile(ZipInputStream zis, OutputStream out)throws IOException {
        ZipEntry ze = null;
        while ((ze = zis.getNextEntry()) != null) {
            byte[] buffer = new byte[1024];
            int count;
            while ((count = zis.read(buffer)) != -1) {
                out.write(buffer, 0, count);
            }
        }
    }