新手上路，各位大佬帮忙改错啊

之前看了很多欢迎页的例子，自己研究了好久，做了一个，结合了大佬的资源，做了一个。各位前辈帮忙提意见 private void initView() { //初始化单选按钮 ra = (RadioGroup) findViewById(R.id.group); radio1 = (RadioButton) findViewById(R.id.ra1); radio2 = (RadioButton) findViewById(R.id.ra2); radio3 = (RadioButton) findViewById(R.id.ra3); viewPager = (ViewPager) findViewById(R.id.viewPager); listview = new ArrayList<>(); View v1 = getLayoutInflater().inflate(R.layout.tab1, null); View v2 = getLayoutInflater().inflate(R.layout.tab2, null); View v3 = getLayoutInflater().inflate(R.layout.tab3, null); listview.add(v1); listview.add(v2); listview.add(v3); myAdapter = new MyAdapter(listview); viewPager.setAdapter(myAdapter); //新的监听事件 viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { switch (position) { case 0: radio1.setChecked(true); radio2.setChecked(false); radio3.setChecked(false); break; case 1: radio1.setChecked(false); radio2.setChecked(true); radio3.setChecked(false); break; case 2: radio1.setChecked(false); radio2.setChecked(false); radio3.setChecked(true); break; } } public void onPageScrollStateChanged(int state) { } });