Android 5.0+ InputStream.read限制为2048字节

Question

我已将缓冲区大小设置为2M，但结果为＆＃34; read.length：＆＃34;在Android 5.0+上始终＆lt; = 2048。为什么呢？

is = connection.getInputStream();
byte[] buffer = new byte[1024 * 1024 * 2];
int length = -1;
while ((length = is.read(buffer)) != -1) {
      Log.d("read.length:"+length);
}