byte[]數組存儲到文件中

首先在清單文件中寫入讀寫權限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
然後寫代碼：

/**
 * byte數組存儲文件
 * @param bs
 * @throws IOException
 */
public void writeBytesToFile(byte[] bs) throws IOException {
   OutputStream out = new FileOutputStream(getDatasFilePath(this) + "mydatas.txt" );
   InputStream is = new ByteArrayInputStream(bs);
   byte[] buff = new byte[1024];
   int len;
   while ((len = is.read(buff)) != -1) {
      out.write(buff, 0, len);
   }
   is.close();
   out.close();
}

/**
 * 獲取文件夾路徑
 *
 * @param context
 * @return
 */
private static String getDatasFilePath(Context context) {
   String path = null;
   try {
      path = Environment.getExternalStorageDirectory().getCanonicalPath() + "/"
            + context.getResources().getString(R.string.app_name) + "/demo/";
      File file = new File(path);
      if (!file.exists()) {
         file.mkdirs();
      }
   } catch (IOException e) {
      e.printStackTrace();
   }
   Log.e("TAG", "getDatasFilePath: " + path);
   return path;
}

調用的時候：

try {
   writeBytesToFile(content);
} catch (IOException e) {
   e.printStackTrace();
}

完事，就是這麼簡單！