效果如图，很常见的一种布局方式，只是没有采用radiobutton，方法都很多，很多人都自定义写在一个view里面，不过代码量偏大，所以还是xml写吧

这样写下来感觉代码量还是挺少的，而且很好扩展，然后在点击的时候加了个回弹动画，顿时体验好多了

public class MainActivity extends BaseActivity implements IMainView ,ViewPager.OnPageChangeListener{    @BindView(R.id.viewPager)    ViewPager viewPager;    private MainAdapter adapter;    private SparseArray
      
        menus = new SparseArray<>();    public static void start(Context context) {        start(context, null);    }    public static void start(Context context, Intent extras) {        Intent intent = new Intent();        intent.setClass(context, MainActivity.class);        if (extras != null) {            intent.putExtras(extras);        }        context.startActivity(intent);    }    @Override    public int layoutID() {        return R.layout.activity_main;    }    @Override    public void init() {        adapter = new MainAdapter(getSupportFragmentManager());        viewPager.setAdapter(adapter);        viewPager.setOffscreenPageLimit(FragmentHelper.getCount());        viewPager.addOnPageChangeListener(this);        addTab(findViewById(R.id.home),0);        addTab(findViewById(R.id.contact),1);        addTab(findViewById(R.id.community),2);        addTab(findViewById(R.id.me),3);        select(0);    }    @Override    public void success() {    }    @Override    public void error() {    }    public void click(View view){        int position = 0;        switch (view.getId()){            case R.id.home:                position = 0;                break;            case R.id.contact:                position = 1;                break;            case R.id.community:                position = 2;                break;            case R.id.me:                position = 3;                break;        }        select(position);    }    /**添加首页按钮缓存*/    private void addTab(View view,int position){        ViewGroup group = cover(view);        CheckBox checkBox = cover(group.getChildAt(0));        checkBox.setChecked(false);        menus.put(position,checkBox);    }    /**选择菜单*/    private void select(int position){        if (menus.get(position).isChecked())            return;//防止执行多次        Log.e("tag",position+"");        for (int i = 0;i < menus.size();i++) {            CheckBox box = menus.get(i);            if (box == null)                continue;            if (i == position) {                box.setChecked(true);            }else                box.setChecked(false);        }        viewPager.setCurrentItem(position, false);    }    @Override    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @Override    public void onPageSelected(int position) {        select(position);    }    @Override    public void onPageScrollStateChanged(int state) {    }}
      

public class HomeFragment extends LazyFragment {    @BindView(R.id.tv_tag)    TextView tv_tag;    @Override    protected int getLayoutId() {        return R.layout.fragment_home;    }    @Override    protected void init() {        String tag = getArguments().get("tag").toString();        if (tag != null)            tv_tag.setText(tag);    }    @OnClick({R.id.search})    public void search(View view){        FragmentFactory.start(getActivity(),FragmentFactory.SEARCH);    }}

public class BounceView extends android.support.v7.widget.AppCompatCheckBox{    public BounceView(Context context) {        super(context);        init();    }    public BounceView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public BounceView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init(){        setOnCheckedChangeListener(new OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {                if (b)                    startAnimation();            }        });    }    public void startAnimation() {        ValueAnimator anim = ValueAnimator.ofInt(-10,0,6,0);        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                int curValue = (int) animation.getAnimatedValue();                layout(                        getLeft(),                        curValue+((ViewGroup)getParent()).getPaddingTop(),                        getRight(),                        curValue+getHeight()+((ViewGroup)getParent()).getPaddingBottom()                );            }        });        anim.setInterpolator(new BounceInterpolator());        anim.setDuration(500);        anim.start();    }}

public class MainAdapter extends FragmentPagerAdapter {    public MainAdapter(FragmentManager fm) {        super(fm);    }    @Override    public Fragment getItem(int position) {        return FragmentHelper.getFragment(position);    }    @Override    public int getCount() {        return FragmentHelper.getCount();    }}

public class FragmentHelper {    private static SparseArray
      
       
        > arr = new SparseArray
        
         
          >();    public static LazyFragment getFragment(int pos) {        LazyFragment fragment = null;        if (null != arr.get(pos))            fragment = arr.get(pos).get();        if (null == fragment) {            switch (pos) {                case 0:                    fragment = new HomeFragment();                    break;                case 1:                    fragment = new HomeFragment();                    break;                case 2:                    fragment = new HomeFragment();                    break;                case 3:                    fragment = new HomeFragment();                    break;                default:                    break;            }            Bundle bundle = new Bundle();            bundle.putString("tag",pos+"");            fragment.setArguments(bundle);            arr.put(pos, new SoftReference
          
           (fragment));        }        return fragment;    }    public static int getCount(){        return 4;    }}
          
         
        
       
      

fragment采用懒加载方式，这个就不说了

public abstract class LazyFragment extends BaseFragment {    protected boolean isLoad;//是否加载完    /**     * 在这里实现Fragment数据的缓加载.     */    @Override    public void setUserVisibleHint(boolean isVisibleToUser) {        super.setUserVisibleHint(isVisibleToUser);        if(getUserVisibleHint()) {            isVisible = true;            onVisible();        } else {            isVisible = false;        }    }    protected void onVisible(){        if(!isPrepared || !isVisible || !isLoad) {            return;        }        init();        Log.e("tag","init success");    }}

 

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