获得资源文件

    setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.tv);
//        声明资源变量
        Resources res = getResources();
        //获得输入流
        InputStream in = res.openRawResource(R.raw.text);
        Scanner sc = new Scanner(in);
        while(sc.hasNext()){
            tv.append(sc.next());
        }
    }