public String getString() {
    try (InputStream in = getResources().getAssets().open("hello.txt");) {
        int length = in.available();//获取文件的大小(字节数)
        byte[] buffer = new byte[length];//创建一个byte数组， 用于装载字节信息
        in.read(buffer);//开始读取文件,将读取到的字节放入到buffer这个数组中
        String temp = null;
        temp = EncodingUtils.getString(buffer, "UTF-8");
        //temp = EncodingUtils.getString(buffer, "UNICODE");
        //temp = EncodingUtils.getString(buffer, "BIG5");
        //temp = EncodingUtils.getString(buffer, "ANST");
        //String temp = new String(buffer);
        return temp;
    } catch (Exception ex) {
        return null;
    }
}