很多上传操作需要文件对象或者 byte 数组,但是 Uri 获取文件对象是不方便的(content 类型的 Uri),但是相对于获取 InputStream 是方便的:
InputStream iStream = getContentResolver().openInputStream(uri);
byte[] inputData = getBytes(iStream);
然后 InputStream 获取目标文件的 bytes
public byte[] getBytes(InputStream inputStream) throws IOException {
ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
byteBuffer.write(buffer, 0, len);
}
return byteBuffer.toByteArray();
}