Android(安卓)RadioButton+Viewpager+Fragment实现底部导航栏

第一步：XMl布局

<?xml version="1.0" encoding="utf-8"?>

第二步：在drawavle创建xml文件设置图片点击效果

<?xml version="1.0" encoding="utf-8"?>

第三步：在drawavle创建xml文件设置字体颜色点击效果

<?xml version="1.0" encoding="utf-8"?>//设置底部字体颜色点击后的状态

第四步：在Values下定义style.xml

<?xml version="1.0" encoding="utf-8"?>

第五步：编写ViewPager适配器

public class MyPagerAdapter extends FragmentPagerAdapter{    private List list ;    private Context context;    public MyPagerAdapter(FragmentManager fm, List list, Context context) {        super(fm);        this.list = list;        this.context = context;    }    @Override    public Fragment getItem(int position) {        return list.get(position);    }    @Override    public int getCount() {        return list.size();    }}

第六步：在MianActivity编写Java代码

public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, ViewPager.OnPageChangeListener {    private ViewPager vp;    private List list = new ArrayList<>();    private RadioButton tv1;    private RadioButton tv2;    private RadioGroup rg;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        vp = (ViewPager) findViewById(R.id.vp);        tv1 = (RadioButton) findViewById(R.id.tv1);        tv2 = (RadioButton) findViewById(R.id.tv2);        rg = (RadioGroup) findViewById(R.id.rg);        list.add(new AFragment());        list.add(new BFragment());        MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager(), list, this);        vp.setAdapter(adapter);        rg.check(R.id.tv1);        vp.setCurrentItem(0);        rg.setOnCheckedChangeListener(this);        vp.addOnPageChangeListener(this);    }    @Override    public void onCheckedChanged(RadioGroup group, int checkedId) {        switch (checkedId){            case R.id.tv1:                vp.setCurrentItem(0);                break;            case R.id.tv2:                vp.setCurrentItem(1);                break;        }    }    @Override    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @Override    public void onPageSelected(int position) {        switch (position){            case 0:                rg.check(R.id.tv1);                break;            case 1:                rg.check(R.id.tv2);                break;        }    }    @Override    public void onPageScrollStateChanged(int state) {    }}

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