我在安卓3.1的烦恼与UsbRequest类。
I have troubles with UsbRequest class in Android 3.1.
这是我的code:
ByteBuffer buffer = ByteBuffer.allocate(4096);
buffer.order(ByteOrder.LITTLE_ENDIAN);
UsbRequest request = new UsbRequest();
request.initialize(mConnection, mEndpointIn);
request.queue(buffer, 4096);
if (mConnection.requestWait() == request) {
byte[] data = buffer.array();
}
数组的大小数据
是4096,但确实接收的字节长度更小。
The size of array data
is 4096, but the length of really received bytes is much more smaller.
我怎么能确定真正接收的字节大小?
How can i determine the size of really received bytes?
感谢。
这是Android的一个错误。在受灾的版本,有没有解决方法,因为实现根本不通过长了起来。
This was a bug in Android. On afflicted versions, there's no workaround, because the implementation simply doesn't pass the length up.
这是固定在JB-MR1(API级别17起)。
It was fixed in JB-MR1 (API level 17 onwards).