怎样在collectionView头部添加轮播图，要求能随collectionView滚动

Posted 2023-05-17

参考技术A 你把轮播图那个View
[self.collectionView registerClass:[lunboView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:findCollectionViewSectionHeaderIdentifier];

其中lunboView继承与UICollectionReusableView
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath

lunboView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:findCollectionViewSectionHeaderIdentifier forIndexPath:indexPath];


你把你的轮播View加到新建的那个View中就行了！

Main3Activity侧滑加轮播图

public class Main3Activity extends AppCompatActivity {
    private int num = 10;
    private int some = 1;
    private String myurl = "http://api.tianapi.com/social/?key=48a7d7193e11bd2dd4a683b6e2f90a4f&num= " + num;

    private Handler myhandler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            int position = vp.getCurrentItem();
            position++;
            vp.setCurrentItem(position);
            sendEmptyMessageDelayed(0, 1000);


        }
    };
    private List<ImageView> li = new ArrayList<>();
    private List<String> as;
    private List<NewsBean.NewslistBean> list = new ArrayList<>();
    private PullToRefreshScrollView psv;
    private MyListView mylv;
    private DisplayImageOptions options;
    private ViewPager vp;
    private LinearLayout linpot;
    private int type = 1;
    private int one = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        vp = findViewById(R.id.vp);
        psv = findViewById(R.id.psv);
        mylv = findViewById(R.id.mylv);
        linpot = findViewById(R.id.linpot);

        intpsv();

        getdatas();

        options = new DisplayImageOptions.Builder()
                .cacheInMemory(true)//使用内存缓存
                .cacheOnDisk(true)//使用磁盘缓存
                .showImageOnLoading(R.mipmap.ic_launcher)//设置正在下载的图片
                .showImageForEmptyUri(R.mipmap.ic_launcher)//url为空或请求的资源不存在时
                .showImageOnFail(R.mipmap.ic_launcher)//下载失败时显示的图片
                .bitmapConfig(Bitmap.Config.RGB_565)//设置图片色彩模式 1px=2字节
                .imageScaleType(ImageScaleType.EXACTLY)//设置图片的缩放模式
                //displayer(new RoundedBitmapDisplayer(100))//设置圆角 30代表半径 自定义
                .build();
        vp.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        myhandler.removeCallbacksAndMessages(null);
                        break;
                    case MotionEvent.ACTION_POINTER_UP:
                        myhandler.sendEmptyMessageDelayed(0, 1000);
                        break;
                    case MotionEvent.ACTION_CANCEL:
                        myhandler.sendEmptyMessageDelayed(0, 2000);

                        break;


                }


                return false;
            }
        });

    }

    private void setSelectedPoint(int pageIndex) {
        for (int i = 0; i < li.size(); i++) {
            if (i == pageIndex) {
                li.get(i).setImageResource(R.drawable.selected);
            } else {
                li.get(i).setImageResource(R.drawable.unselected);
            }
        }


    }

    private void getdatas() {
        MyTask myTask = new MyTask(new MyTask.Icallbacks() {
            @Override
            public void updateUiByjson(String jsonstr) {
                Gson gson = new Gson();
                NewsBean newsBean = gson.fromJson(jsonstr, NewsBean.class);
                List<NewsBean.NewslistBean> data = newsBean.getNewslist();
                if (type == 1) {
                    list.clear();
                }
                list.addAll(data);
                as = new ArrayList<>();
                for (int i = 0; i < data.size(); i++) {
                    String picurl = data.get(i).getPicUrl();
                    as.add(picurl);
                }
                as = new ArrayList<>();
                for (int i = 0; i < data.size(); i++) {
                    String picurl = data.get(i).getPicUrl();
                    as.add(picurl);
                }
                if (one == 1) {
                    for (int i = 0; i < data.size(); i++) {
                        ImageView iv = new ImageView(Main3Activity.this);
                        if (i == 0) {
                            iv.setImageResource(R.drawable.selected);
                        } else {
                            iv.setImageResource(R.drawable.unselected);
                        }
                        linpot.addView(iv);
                        li.add(iv);

                    }


                }
                vp.setAdapter(new MyVpAdapter());
                mylv.setAdapter(new MyAdapter4(Main3Activity.this, data));
                myhandler.sendEmptyMessageDelayed(0, 1000);

                psv.onRefreshComplete();

            }
        });
        myTask.execute(myurl);


    }


    private void intpsv() {
        psv.setMode(PullToRefreshBase.Mode.BOTH);
        psv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ScrollView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ScrollView> refreshView) {
                some = 1;
                num = 10;
                myhandler.removeCallbacksAndMessages(null);
                myurl = "http://api.tianapi.com/social/?key=48a7d7193e11bd2dd4a683b6e2f90a4f&num=" + num;
                getdatas();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ScrollView> refreshView) {
                some = 2;
                num++;

                myhandler.removeCallbacksAndMessages(null);

                myurl = "http://api.tianapi.com/social/?key=48a7d7193e11bd2dd4a683b6e2f90a4f&num=" + num;
                getdatas();
            }
        });


    }


    private class MyVpAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ImageView imageView = new ImageView(Main3Activity.this);
            ImageLoader.getInstance().displayImage(as.get(position % as.size()), imageView, options);
            return imageView;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.addView((View) object);
        }
    }
}

<com.handmark.pulltorefresh.library.PullToRefreshScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/psv">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <!--轮播图-->
        <android.support.v4.view.ViewPager
            android:layout_width="match_parent"
                android:background="#f0f"
            android:layout_height="200dp"
            android:id="@+id/vp"></android.support.v4.view.ViewPager>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/linpot"
            android:orientation="horizontal"
            android:gravity="center"
            android:layout_gravity="bottom"></LinearLayout>

    </FrameLayout>


    <com.example.myapplication.MyListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/mylv"></com.example.myapplication.MyListView>



</LinearLayout>

</com.handmark.pulltorefresh.library.PullToRefreshScrollView>