viewpager和fragment的联动

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主类

public class MainActivity extends FragmentActivity {   private ViewPager viewPager;    private RadioGroup rg;    private RadioButton shou,fen,shop,user;    private List<Fragment> list;    private ShouYe one;    private FenLei two;    private Shop three;    private User four;    private MyFragmentAdapter myFragmentAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        viewPager = (ViewPager) findViewById(R.id.viewpager);        shou = (RadioButton) findViewById(R.id.btn_one);        fen = (RadioButton) findViewById(R.id.btn_two);        shop = (RadioButton) findViewById(R.id.btn_three);        user = (RadioButton) findViewById(R.id.btn_four);        rg = (RadioGroup) findViewById(R.id.rg_menu);        list = new ArrayList<Fragment>();        one = new ShouYe();        two = new FenLei();        three = new Shop();        four = new User();        list.add(one);        list.add(two);        list.add(three);        list.add(four);        FragmentManager fm = getSupportFragmentManager();        //初始化自定义适配器        myFragmentAdapter =  new MyFragmentAdapter(fm,list);        viewPager.setAdapter(myFragmentAdapter);        //viewPager的滑动        viewPager.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                switch (view.getId()){                    case R.id.btn_one:                        //给ViewPager设置当前布局                        viewPager.setCurrentItem(0);                    case R.id.btn_two:                        //给ViewPager设置当前布局                        viewPager.setCurrentItem(1);                    case R.id.btn_three:                        //给ViewPager设置当前布局                        viewPager.setCurrentItem(2);                    case R.id.btn_four:                        //给ViewPager设置当前布局                        viewPager.setCurrentItem(3);                }            }        });        //RadioButton的点击事件实现联动     shou.setOnClickListener(new View.OnClickListener() {         @Override         public void onClick(View view) {             viewPager.setCurrentItem(0);         }     });        fen.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                viewPager.setCurrentItem(1);            }        });        shop.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                viewPager.setCurrentItem(2);            }        });        user.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                viewPager.setCurrentItem(3);            }        });    }}

适配器

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

主xml文件

<android.support.v4.view.ViewPager    android:id="@+id/viewpager"    android:layout_width="fill_parent"    android:layout_height="0dp"    android:layout_weight="8"></android.support.v4.view.ViewPager>    <!-- 指示标签 -->    <LinearLayout        android:id="@+id/cursorarea"        android:layout_width="fill_parent"        android:background="#CDCDCD"        android:orientation="horizontal"        android:layout_height="2dp">        <ImageView            android:id="@+id/cursor_btn"            android:layout_width="fill_parent"            android:layout_height="fill_parent">        </ImageView>    </LinearLayout>    <RelativeLayout        android:id="@+id/bottomlinear"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:background="#DCDCDC">  -->        <RadioGroup            android:id="@+id/rg_menu"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_alignParentBottom="true"            android:orientation="horizontal"            android:padding="5dp"            >            <RadioButton                android:id="@+id/btn_one"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:padding="-5dp"                android:textSize="14sp"                android:button="@null"                android:gravity="center"                android:text="首页"                android:checked="true"                android:drawableTop="@drawable/firstbtn"                />            <RadioButton                android:id="@+id/btn_two"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:textSize="14sp"                android:button="@null"                android:gravity="center"                android:text="分类"                android:checked="true"                android:drawableTop="@drawable/sceondbtn"                />            <RadioButton                android:id="@+id/btn_three"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:textSize="14sp"                android:button="@null"                android:gravity="center"                android:drawableTop="@drawable/threebtn"                android:checked="true"                android:text="购物车"                />            <RadioButton                android:id="@+id/btn_four"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:textSize="14sp"                android:button="@null"                android:gravity="center"                android:checked="true"                android:drawableTop="@drawable/fourbtn"                android:text="我的"                />        </RadioGroup>    </RelativeLayout>

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