设置背景选择器和button按钮的下划线

首先利用RadioGroup包裹着RadioButton
下面看下布局文件

 "0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center"
            android:orientation="horizontal"
            >
            "@+id/home_attention"
                android:layout_width="100px"
                android:layout_height="match_parent"
                android:button="@null"
                android:text="关注"
                android:gravity="center"
                android:textSize="20sp"
                android:textColor="@drawable/textcolor"
                android:drawableBottom="@drawable/radiogroup_select"
                />
            "@+id/home_hot"
                android:layout_width="100px"
                android:layout_height="match_parent"
                android:button="@null"
                android:text="热门"
                android:gravity="center"
                android:textSize="20sp"
                android:checked="true"
                android:layout_marginLeft="70px"
                android:layout_marginRight="70px"
                android:textColor="@drawable/textcolor"
                android:drawableBottom="@drawable/radiogroup_select"
                />
            "@+id/home_new"
                android:layout_width="100px"
                android:layout_height="match_parent"
                android:button="@null"
                android:text="最新"
                android:gravity="center"
                android:textSize="20sp"
                android:textColor="@drawable/textcolor"
                android:drawableBottom="@drawable/radiogroup_select"
                />

        </RadioGroup>

"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.9"
        />

上面其中设置textcolor和drawableBottom设置的控件都是自定义的控件，下面贴出自定义控件
设置背景选择器，点击变色

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="#000" android:state_checked="false" android:state_enabled="true">item>
    <item android:color="#FF4081" android:state_checked="true" >item>

selector>

drawableBottom设置的自定义图标
也是一个背景选择器，点击设置背景，不点击不切换背景

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:drawable="@drawable/xiahuaxian"/>
    <item android:state_checked="false" android:drawable="@drawable/noxiahuaxian"/>
selector>

设置下划线的自定义图片
选中

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle"
    >
    <solid android:color="@color/colorAccent"/>
    <size android:height="5px"
            android:width="320px"/>

未选中

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"
    >
    <solid android:color="#f3f3f5"/>
    <size android:height="5px"
        android:width="320px"/>


shape>

切换Fragment和viewpager之间的切换

public class HomeActivity extends FragmentActivity implements View.OnClickListener {

    private RadioButton home_attention;
    private RadioButton home_hot;
    private RadioButton home_new;
    private ViewPager home_vp;
    private ArrayList FragmentList;
    private Fragment attentionFragment;
    private Fragment hotFragment;
    private Fragment newFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        initView();
        initdata();

        adpter();
        home_vp.setCurrentItem(1);
    }

    private void initView() {
        home_attention = (RadioButton) findViewById(R.id.home_attention);
        home_hot = (RadioButton) findViewById(R.id.home_hot);
        home_new = (RadioButton) findViewById(R.id.home_new);
        home_vp = (ViewPager) findViewById(R.id.home_vp);

        home_attention.setOnClickListener(this);
        home_hot.setOnClickListener(this);
        home_new.setOnClickListener(this);

    }

    private void adpter() {
        home_vp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return FragmentList.get(position);
            }

            @Override
            public int getCount() {
                return FragmentList.size();
            }
        });
        //默认选择
        home_hot.setChecked(true);
        //设置滑动监听
        home_vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                if (position==0){
                    home_attention.setChecked(true);
                }else if (position==1){
                    home_hot.setChecked(true);
                }else if (position==2){
                    home_new.setChecked(true);
                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }

    private void initdata() {
        FragmentList =new ArrayList();
        attentionFragment = new AttentionFragment();
        hotFragment = new HotFragment();
        newFragment = new NewFragment();
        FragmentList.add(attentionFragment);
        FragmentList.add(hotFragment);
        FragmentList.add(newFragment);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.home_attention:
                home_vp.setCurrentItem(0);
                break;
            case R.id.home_hot:
                home_vp.setCurrentItem(1);
                break;
            case R.id.home_new:
                home_vp.setCurrentItem(2);
                break;
        }
    }
 }