第一种方法：

String path = "file:///android_asset/文件名";

第二种方法：

InputStream abpath = getClass().getResourceAsStream("/assets/文件名");

若要想要转换成String类型

String path = new String(InputStreamToByte(abpath ));

private byte[] InputStreamToByte(InputStream is) throws IOException {

ByteArrayOutputStream bytestream = new ByteArrayOutputStream();

int ch;

while ((ch = is.read()) != -1) {

bytestream.write(ch);

}

byte imgdata[] = bytestream.toByteArray();

bytestream.close();

return imgdata;

}