Android简单实现ViewPager

最新推荐文章于 2022-02-11 10:30:08 发布

原创最新推荐文章于 2022-02-11 10:30:08 发布 · 222 阅读

CC 4.0 BY-SA版权

本文介绍了一种在Android应用中实现ViewPager与RadioGroup组件联动的方法。通过为ViewPager设置不同的Fragment，并利用RadioGroup来控制ViewPager的页面切换，实现了流畅的用户交互体验。代码示例展示了如何绑定视图、设置ViewPager的适配器以及监听RadioGroup的状态变化。

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切换Xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".MainActivity"
    android:orientation="vertical">
    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/ViewPager"
        android:layout_weight="1">
    </android.support.v4.view.ViewPager>
    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal"
        android:layout_weight="1">
        <RadioButton
            android:id="@+id/rb1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:gravity="center"
            android:text="首页"/>
        <RadioButton
            android:id="@+id/rb2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:button="@null"
            android:text="购物车"/>
        <RadioButton
            android:id="@+id/rb3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:button="@null"
            android:text="我的"/>
    </RadioGroup>
</LinearLayout>

ViewPager的切换

public class MainActivity extends AppCompatActivity {
    @BindView(R.id.ViewPager)
    ViewPager vp;
    @BindView(R.id.rg)
    RadioGroup rg;
    @BindView(R.id.rb1)
    RadioButton rb1;
    @BindView(R.id.rb2)
    RadioButton rb2;
    @BindView(R.id.rb3)
    RadioButton rb3;
    List<Fragment> list=new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        list.add(new frag_01());
        list.add(new frag_02());
        list.add(new frag_03());
        vp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int i) {
                return list.get(i);
            }

            @Override
            public int getCount() {
                return list.size();
            }
        });
        vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i1) {

            }

            @Override
            public void onPageSelected(int i) {
                rg.check(rg.getChildAt(i).getId());
            }

            @Override
            public void onPageScrollStateChanged(int i) {

            }
        });
        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId){
                    case R.id.rb1:
                        vp.setCurrentItem(0);
                        break;
                    case R.id.rb2:
                        vp.setCurrentItem(1);
                        break;
                    case R.id.rb3:
                        vp.setCurrentItem(2);
                        break;
                }
            }
        });
    }
}