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在向前的路上也要时不时回头看看基础 -------------出自《小编本人》
本文就是对于Viewpager用法的详细介绍 不多比比 直接上主菜
在Activity中使用FragmentPagerAdapter和PagerAdapter实现viewpager切换的效果（效果图在上面）
1.Activity中使用PagerAdapter实现切换代码
主活动
public class ViewPagerManager extends AppCompatActivity {
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_pager_manager);
viewPager = findViewById(R.id.viewpager);
initView();
}
private void initView() {
List<String> list = new ArrayList<>();
for (int i = 0; i < 3; i++) {
list.add("第"+i+"个View");
}
viewPager.setAdapter(new Adapter(this,list));
}
}
activity_view_pager_manager布局：
<?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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ViewPagerManager">
<androidx.viewpager.widget.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
adapter:
public class Adapter extends PagerAdapter {
private Context mContext;
private List<String> mData;
public Adapter(Context context ,List<String> list) {
mContext = context;
mData = list;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
View view = View.inflate(mContext, R.layout.activity_view_pager_item,null);
TextView tv = view.findViewById(R.id.textaa);
tv.setText(mData.get(position));
container.addView(view);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View)object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}
activity_view_pager_item布局：
<?xml version="1.0" encoding="utf-8"?>
<TextView 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"
android:id="@+id/textaa"
android:gravity="center"
android:text="sadsadsa"
>
</TextView>
Activity中使用FragmentPagerAdapter实现切换
主活动
public class ViewPagerSecondManager extends AppCompatActivity {
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_pager_second_manager);
viewPager = findViewById(R.id.viewpager1);
viewPager.setAdapter(new SecondAdapter(getSupportFragmentManager()));
}
}
adapter:
public class SecondAdapter extends FragmentPagerAdapter{
ArrayList<Fragment> list;
//通过构造获取list集合
public SecondAdapter(FragmentManager fm) {
super(fm);
}
//设置每一个的内容
@Override
public Fragment getItem(int arg0) {
return new DefaultFragment();//你要显示的东西显示在这里面就可以了 (Fragment)
// return list.get(arg0);
}
//设置有多少内容
@Override
public int getCount() {
return 3;
}
}
使用Fragment实现FragmentPagerAdapter实现切换
主活动：
public class PagerFragment extends Fragment {
private ViewPager viewPager;
private View view;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_pager, container, false);
return view;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
viewPager = view.findViewById(R.id.viewpager2);
viewPager.setAdapter(new ViewPagerThirdManagerAdapter(getChildFragmentManager()));
}
}
fragment_pager布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".PagerFragment">
<androidx.viewpager.widget.ViewPager
android:id="@+id/viewpager2"
android:layout_width="match_parent"
android:layout_height="match_parent"></androidx.viewpager.widget.ViewPager>
</LinearLayout>
adapter:
public class ViewPagerThirdManagerAdapter extends FragmentPagerAdapter {
public ViewPagerThirdManagerAdapter(FragmentManager fm) {
super(fm);
}
@NonNull
@Override
public Fragment getItem(int position) {
return new DefaultFragment();
}
@Override
public int getCount() {
return 3;
}
}
ok!以上就是使用FragmentPagerAdapter和PagerAdapter简单的实现Viewpager切换的的效果，你可以根据你的需求进行改进
拓展：(以下是小编运用kotlin之前写的项目中引用的，懒就不单独写demo了 )
class KnolagePagerAdapter(val list: List<KonlageEntity.DataBean.ChildrenBean>,fm: FragmentManager?) : FragmentPagerAdapter(fm) {
override fun getItem(position: Int): Fragment {
var fragment = KnolageShowPagerFragment()//向指定的Fragment中传递参数
var bundle = Bundle()
bundle.putString("wakaka",list.get(position).id)
fragment.arguments = bundle
return fragment
}
override fun getCount(): Int {
return list.size
}
override fun getPageTitle(position: Int): CharSequence? {
return list.get(position).name
}
}
指定的Fragment中接收参数：
var cid = getArguments()?.getString("wakaka")
好啦，本期知识就到这里啦，共同见证进步，是我最大的愿望 一起加油！！