http://www.cnblogs.com/sybz/archive/2011/12/17/2774565.html
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;
}