无限滚动图像ViewPager

Question

如Google所述,Gallery类在API级别16中已弃用.不再支持此小部件.其他水平滚动小部件包括支持库中的Horizo​​ntalScrollView和ViewPager.所以我使用ViewPager作为Gallery类的替代品.

我的目标是最终实现带有文本描述的无限滚动图像ViewPager.我使用下面的代码来实现图像ViewPager,其中包含描述每个图像的文本但是如何将无限滚动应用于ViewPager？

我之前没有使用过ViewPager,请尽量提供详细的代码.

activity_main.xml中:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       android:layout_width="fill_parent" 
       android:layout_height="fill_parent" 
       android:orientation="vertical">
  <android.support.v4.view.ViewPager 
       android:id="@+id/myimagepager" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" /> 
</LinearLayout>

custom_pager.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
   android:layout_width="match_parent" 
   android:layout_height="match_parent" 
   android:orientation="vertical"  
   android:gravity="center_horizontal">
   <ImageView 
       android:id="@+id/myimage" 
       android:layout_width="match_parent" 
       android:layout_height="0dp" 
       android:layout_margin="5dp" 
       android:layout_weight="2" /> 
    <TextView 
       android:id="@+id/image_text" 
       android:layout_width="fill_parent" 
       android:layout_height="0dp"   
       android:layout_weight="1"/>

</LinearLayout>

ImagePager:

public class ImagePager extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ImagePagerAdapter adapter = new ImagePagerAdapter(this, imageArra, stringArray );
        ViewPager myPager = (ViewPager) findViewById(R.id.myimagepager);
        myPager.setAdapter(adapter);
        myPager.setCurrentItem(0);
    }

    private int imageArra[] = { R.drawable.a, R.drawable.b,R.drawable.c, 
                                 R.drawable.d,R.drawable.e,R.drawable.f,
                                 R.drawable.g, R.drawable.h, R.drawable.i};

    private String[] stringArray = new String[] { "Image a", "Image b","Image c"
                                                   "Image d","Image e","Image f", 
                                                   "Image g","Image h","Image i"};


}

ImagePagerAdapter:

public class ImagePagerAdapter extends PagerAdapter {

    Activity activity;
    int imageArray[];
    String[] stringArray;

    public ImagePagerAdapter(Activity act, int[] imgArra, String[] stringArra) {
        imageArray = imgArra;
        activity = act;
        stringArray = stringArra;
    }

    public int getCount() {
        return imageArray.length;
    }

    public Object instantiateItem(View collection, int position) {
        LayoutInflater inflater = (LayoutInflater)collection.getContext
                          ().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View layout = inflater.inflate(R.layout.custom_pager, null);   

        ImageView im=(ImageView) layout.findViewById(R.id.myimage);             
        im.setImageResource(imageArray[position]);

        TextView txt=(TextView) layout.findViewById(R.id.image_text);
        txt.setText(stringArray[position]);

        ((ViewPager) collection).addView(layout, 0);
          return layout;   
    }

    @Override
    public void destroyItem(View arg0, int arg1, Object arg2) {
        ((ViewPager) arg0).removeView((View) arg2);
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        return arg0 == ((View) arg1);
    }

    @Override
    public Parcelable saveState() {
        return null; 
    }


}

Answer 1

我有同样的问题,但我能找到解决它的方法 - 代码可以在github上找到.

如果将InfiniteViewPager和InfinitePagerAdapter类复制到项目中,则可以通过一些小的更改实现无限(包装)滚动.

在您的Activity中,将PagerAdapter包装为InfinitePagerAdapter:

PagerAdapter adapter = new InfinitePagerAdapter(new ImagePagerAdapter(this, imageArra, stringArray));

将活动XML中的ViewPager更改为InfiniteViewPager:

<com.antonyt.infiniteviewpager.InfiniteViewPager 
       android:id="@+id/myimagepager" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" />

您可以将类重命名为您想要的任何名称.此代码仅在您至少有三个页面时才有效(您的示例代码中有九个,因此它可以正常工作).

Answer 2

我认为我的解决方案更简单.

注意我的图像数组结构:

Item 0          => last image

Item count()-1  => first image

诀窍是onPageScrollStateChanged:

当用户滚动到最后一项 - >寻呼机没有动画跳转到第一个图像(位置= 1)

当用户滚动到第一个项目时 - >寻呼机跳转而没有动画到最后一个图像(位置=计数 - 2)

public class InfiniteScrollingActivity extends ActionBarActivity {

    private ViewPager     pager;
    private MyAdapter     adapter;
    int[] promoImageIds = new int[]{R.drawable.cover6, R.drawable.cover1, R.drawable.cover2, R.drawable.cover3, R.drawable.cover4, R.drawable.cover5, R.drawable.cover6, R.drawable.cover1 };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_test);

        adapter = new MyAdapter(getSupportFragmentManager(), promoImageIds);
        pager = (ViewPager)findViewById(R.id.pager);
        pager.setAdapter(adapter);
        pager.setCurrentItem( 1 );
        pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageSelected(int index) {
                Log.v( "onPageSelected", String.valueOf( index ) );
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // Log.v("onPageScrolled", "");
            }

            @Override
            public void onPageScrollStateChanged(int state) {
                Log.v("onPageScrollStateChanged", String.valueOf(state));

                if (state ==ViewPager.SCROLL_STATE_IDLE) {
                    int index = pager.getCurrentItem();
                    if ( index == 0 )
                        pager.setCurrentItem( adapter.getCount() - 2, false );
                    else if ( index == adapter.getCount() - 1 )
                        pager.setCurrentItem( 1 , false);
                }
            }
        });
    }


    public static class MyAdapter extends FragmentPagerAdapter {

        int[] promoImageIds;

        public MyAdapter(FragmentManager fm, int[] promoImageIds){
            super(fm);
            this.promoImageIds = promoImageIds;
        }

        @Override
        public int getCount(){
            return promoImageIds.length;
        }

        @Override
        public Fragment getItem(int position) {

            return PromoFragment.newInstance( promoImageIds[position] );
        }
    }

    public static class PromoFragment extends Fragment
    {
        int imageID;


        static PromoFragment newInstance( int imageID)
        {
            PromoFragment f = new PromoFragment();

            // Supply num input as an argument.
            Bundle args = new Bundle();
            args.putInt( "imageID", imageID );
            f.setArguments(args);

            return f;
        }

        @Override
        public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            imageID = getArguments() != null ? getArguments().getInt( "imageID" ) : null;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState)
        {
            ImageView v = (ImageView) inflater.inflate(R.layout.fragment_image, container, false);
            v.setImageResource( imageID );
            return v;
        }
    }
}

Answer 3

我已经通过简单的技巧找到了一种方法,我希望它对你有所帮助

import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;

public class ImagePager extends Activity {
    String[] stringArray;
    int[] imageArra;
    ViewPager myPager;
    Boolean isScrooled = false;
    // use this array yo understand swipe left or right ?
    ArrayList<Float> pos = new ArrayList<Float>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

            // put  empty view at the beginnig and to end

        imageArra = new int[] { 0, R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher, 0 };

           // put  empty string at the beginnig and to end

        stringArray = new String[] { "", "Image a", "Image b", "Image c",
                "Image d", "Image e", "Image f", "Image g", "Image h",
                "Image i", "" };

        ImagePagerAdapter adapter = new ImagePagerAdapter(this, imageArra,
                stringArray);
        myPager = (ViewPager) findViewById(R.id.myimagepager);
        myPager.setAdapter(adapter);
        myPager.setCurrentItem(1);

        myPager.setOnPageChangeListener(new OnPageChangeListener() {

            @Override
            public void onPageSelected(int arg0) {
                Log.v("onPageSelected", String.valueOf(arg0));
                pos.clear();
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                try {
                            // while scrolling i add ever pos to array
                    pos.add(arg1);
                                    // if pos.get(0) > pos.get(pos.size() - 1) 
                    // <----- swipe <-----  
                                    // we should check isScroll because setCurrent item is not a croll ? 

                    if (pos.size() > 0)
                        if (arg0 == imageArra.length - 1
                                & pos.get(0) > pos.get(pos.size() - 1)
                                & isScrooled == true) {
                            try {
                                isScrooled = false;
                                myPager.setCurrentItem(1, false);
                            } catch (Exception e) {
                                Log.v("hata",
                                        "<----- swipe <-----  " + e.toString());
                            }

                        }
                        // ----> swipe ---->
                        else if (arg0 == 0
                                & pos.get(0) < pos.get(pos.size() - 1)
                                & isScrooled == true) {
                            try {
                                isScrooled = false;
                                myPager.setCurrentItem(imageArra.length - 1,
                                        false);
                            } catch (Exception e) {
                                Log.v("hata",
                                        "----> swipe ---->  " + e.toString());
                            }

                        } else if (arg0 == 0 & pos.size() == 1
                                & isScrooled == true) {
                            try {
                                isScrooled = false;
                                myPager.setCurrentItem(imageArra.length - 1,
                                        false);
                            } catch (Exception e) {
                                Log.v("hata",
                                        "----> swipe ---->  " + e.toString());
                            }

                        }

                } catch (Exception e) {
                    Log.v("hata", e.toString());
                }

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                Log.v("onPageScrollStateChanged", String.valueOf(arg0));
                            // set is scrolling
                isScrooled = true;
            }
        });

    }

}

[编辑1]

import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;

public class ImagePager extends Activity {
    String[] stringArray;
    int[] imageArra;
    ViewPager myPager;
    int scrollState;
    Boolean isFirstVisitEnd= true,isFirstVisitBegin = true;
    ArrayList<Integer> pos = new ArrayList<Integer>();


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageArra = new int[] { 0,R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher,
                R.drawable.ic_launcher, R.drawable.ic_launcher, 0 };

        stringArray = new String[] {"","Image a", "Image b", "Image c",
                "Image d", "Image e", "Image f", "Image g", "Image h",
                "Image i", "" };

        ImagePagerAdapter adapter = new ImagePagerAdapter(this, imageArra,
                stringArray);
        myPager = (ViewPager) findViewById(R.id.myimagepager);
        myPager.setAdapter(adapter);
        myPager.setCurrentItem(1);

        myPager.setOnPageChangeListener(new OnPageChangeListener() {
            @Override
            public void onPageSelected(int arg0) {
                Log.v("onPageSelected", String.valueOf(arg0));
                pos.clear();
                if (arg0 == imageArra.length - 1)
                    isFirstVisitEnd = false;
                else
                    isFirstVisitEnd = true;


                if (arg0 == 0)
                    isFirstVisitBegin = false;
                else
                    isFirstVisitBegin = true;
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {                                
                try { 
                    pos.add(Integer.valueOf(arg2));

                    if (pos.size() > 0) {
                        //Log.v("onPageScrolled_arg2","arg0  : "+String.valueOf(arg0)+"   ilk : "+pos.get(0).toString()+"    son : " +pos.get(pos.size() - 1).toString()+ "   "+ String.valueOf(pos.get(0)-(pos.get(pos.size() - 1)))+"    isFirstVisitEnd: "+String.valueOf(isFirstVisitEnd.booleanValue()) );

                        // <----- swipe <-----
                        if (arg0 == imageArra.length - 2& (pos.get(pos.size() - 1) -pos.get(0)  < 100)& scrollState == 2 & isFirstVisitEnd == false) {                          
                            myPager.setCurrentItem(1, false);
                        }

                        //Log.v("onPageScrolled_arg2","arg0  : "+String.valueOf(arg0)+"   ilk : "+pos.get(0).toString()+"    son : " +pos.get(pos.size() - 1).toString()+ "   "+ String.valueOf(pos.get(0)-(pos.get(pos.size() - 1)))+"    isFirstVisitbegin: "+String.valueOf(isFirstVisitBegin.booleanValue()) );
                        if (arg0 == 0 & (pos.get(pos.size() - 1) -pos.get(0)  > -100)& scrollState == 2 & isFirstVisitBegin == false) {                         
                            myPager.setCurrentItem(imageArra.length - 2, false);
                        }       
                    }

                } catch (Exception e) {
                    Log.v("hata", e.toString());
                }

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                Log.v("onPageScrollStateChanged", String.valueOf(arg0));
                scrollState =arg0;
            }
        });
    }
}

Answer 4

I found another solution, based on Shlomi Hasin and antonyt answers, without modifying collection.

ViewPager yourPager;
PagerAdapter yourAdapter;
//....
EndlessPagerAdapter endlessPagerAdapter = new EndlessPagerAdapter(yourAdapter, yourPager);
yourPager.setAdapter(endlessPagerAdapter);
yourPager.setCurrentItem(1);//for correct first page

Full class:

public class EndlessPagerAdapter extends PagerAdapter {

private PagerAdapter adapter;

public EndlessPagerAdapter(PagerAdapter adapter, ViewPager viewPager) {
    this.adapter = adapter;
    viewPager.addOnPageChangeListener(new SwapPageListener(viewPager));
}

@Override
public int getCount() {
    return adapter.getCount() + 2;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
    if (adapter.getCount() < 2) {
        adapter.instantiateItem(container, position);
    }

    int newPosition;
    if (position == 0) {
        newPosition = adapter.getCount() - 1;
    } else if (position >= getCount() - 1) {
        newPosition = 0;
    } else {
        newPosition = position - 1;
    }
    return adapter.instantiateItem(container, newPosition);
}

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

@Override
public void finishUpdate(ViewGroup container) {
    adapter.finishUpdate(container);
}

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

@Override
public void restoreState(Parcelable bundle, ClassLoader classLoader) {
    adapter.restoreState(bundle, classLoader);
}

@Override
public Parcelable saveState() {
    return adapter.saveState();
}

@Override
public void startUpdate(ViewGroup container) {
    adapter.startUpdate(container);
}

@Override
public CharSequence getPageTitle(int position) {
    return adapter.getPageTitle(position);
}

@Override
public float getPageWidth(int position) {
    return adapter.getPageWidth(position);
}

@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
    adapter.setPrimaryItem(container, position, object);
}

@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
    adapter.unregisterDataSetObserver(observer);
}

@Override
public void registerDataSetObserver(DataSetObserver observer) {
    adapter.registerDataSetObserver(observer);
}

@Override
public void notifyDataSetChanged() {
    adapter.notifyDataSetChanged();
}

@Override
public int getItemPosition(Object object) {
    return adapter.getItemPosition(object);
}

private class SwapPageListener implements ViewPager.OnPageChangeListener {

    private ViewPager viewPager;

    SwapPageListener(ViewPager viewPager) {
        this.viewPager = viewPager;
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {

    }

    @Override
    public void onPageScrollStateChanged(int state) {
        if (state == ViewPager.SCROLL_STATE_IDLE) {
            PagerAdapter pagerAdapter = viewPager.getAdapter();
            if (pagerAdapter != null) {
                int itemCount = pagerAdapter.getCount();
                if (itemCount < 2) {
                    return;
                }
                int index = viewPager.getCurrentItem();
                if (index == 0 ) {
                    viewPager.setCurrentItem(itemCount - 2, false);
                } else if (index == itemCount - 1) {
                    viewPager.setCurrentItem(1, false);
                }
            }
        }
    }
}}

How it works:

We have some collection

then add two additional items to it

show first element on last position and last element on first position

add listener and swap pages on event, from 4 to 1 and from 0 to 3

thats all.

我不建议你在那里应用动画或重布局，当元素交换时它可能会滞后。（也许，我没有遇到任何滞后）

也不要多次将此适配器设置为寻呼机，或将 SwapPageListener 移动到外部类并将其设置在初始化块中。