RadioGroup 和 ViewPager 实现联动效果

来源：互联网发布：无线ad hoc网络编辑：程序博客网时间：2024/05/21 13:58

这是布局（控件）：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="bawe.day0919.MainActivity">    <RadioGroup        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:layout_alignParentBottom="true"        android:id="@+id/rg"        >        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/rg1"            android:text="联系人"            android:button="@null"            android:layout_weight="1"            android:checked="true"           android:gravity="center"            />        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/rg2"            android:text="消息"            android:button="@null"            android:layout_weight="1"            android:gravity="center"            />        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/rg3"            android:text="我"            android:button="@null"            android:layout_weight="1"            android:gravity="center"            />    </RadioGroup>    <android.support.v4.view.ViewPager        android:layout_above="@id/rg"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/pager"        ></android.support.v4.view.ViewPager></RelativeLayout>

//==================================================以下是主要代码=================================================================

public class MainActivity extends FragmentActivity {    private ViewPager pa;    private RadioGroup rg;    private List<Fragment> data=new ArrayList<Fragment>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        pa = (ViewPager) findViewById(R.id.pager);        rg = (RadioGroup) findViewById(R.id.rg);//添加        data.add(new Xingweng());        data.add(new Guanzhu());        data.add(new Dongtai());//ViewPager控件        pa = (ViewPager) findViewById(R.id.pager);//监听事件        pa.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageSelected(int arg0) {//改变radiobutton选中状态                rg.check(rg.getChildAt(arg0).getId());            }            @Override            public void onPageScrolled(int arg0, float arg1, int arg2) {// TODO Auto-generated method stub            }            @Override            public void onPageScrollStateChanged(int arg0) {// TODO Auto-generated method stub            }        });//设置适配器        Myadpader myadpader = new Myadpader(getSupportFragmentManager());        pa.setAdapter(myadpader);//点击事件        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch (checkedId) {                    case R.id.rg1:                        pa.setCurrentItem(0);                        break;                    case R.id.rg2:                        pa.setCurrentItem(1);                        break;                    case R.id.rg3:                        pa.setCurrentItem(2);                        break;                    default:                        break;                }            }        });    }    //适配器    public class Myadpader extends FragmentPagerAdapter {        public Myadpader(FragmentManager fm) {            super(fm);// TODO Auto-generated constructor stub        }        @Override        public Fragment getItem(int arg0) {// TODO Auto-generated method stub            return data.get(arg0);        }        @Override        public int getCount() {// TODO Auto-generated method stub            return data.size();        }    }}

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