安卓：使图像库无限循环 [英] Android: making gallery infinite loop of images

问题描述

我使用的是画廊在我的项目中，我已经添加了四象，我希望它是来自右侧和左侧无限。我如何做到这一点？

I'm using a gallery in my project in which I have added four images and I want it to be infinite from both right side and left side. How do I accomplish this?

推荐答案

其主要思想是，在你的 getView 方法，你必须使用

The main idea is that in your getView method you have to use

position = position % imagesArray.length;
if (position < 0)
    position = position + imagesArray.length;

imagesArray 是保存在你的资源文件夹中的图像为例数组：

imagesArray is the array that holds the images in your res folder for exemple:

public class CircularGallery extends Activity {
/** Called when the activity is first created. */
private Integer[] imagesArray = { R.drawable.picture1, R.drawable.picture2, R.drawable.picture3, R.drawable.picture4, R.drawable.picture5, R.drawable.picture6 , R.drawable.picture7   }; 

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

    Gallery g = (Gallery) findViewById(R.id.gallery); 
    g.setAdapter(new ImageAdapter(this)); 

    g.setOnItemClickListener(new OnItemClickListener() { 
        public void onItemClick(AdapterView parent, View v, int position, long id) { 
            if (position >= imagesArray.length) { 
                position = position % imagesArray.length; 
            } 
            Toast.makeText(CircularGallery.this, "" + position, Toast.LENGTH_SHORT).show(); 
        } 
    }); 

}

public class ImageAdapter extends BaseAdapter { 
    int mGalleryItemBackground; 
    private Context mContext; 

    public ImageAdapter(Context c) { 
        mContext = c; 
        TypedArray a = obtainStyledAttributes(R.styleable.Gallery1); 
        mGalleryItemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0); 

        a.recycle(); 
    } 

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

    public Object getItem(int position) { 
        if (position >= imagesArraylength) { 
            position = position % mImageIds.length; 
        } 
        return position; 
    } 

    public long getItemId(int position) { 
        if (position >= imagesArray.length) { 
            position = position % imagesArray.length; 
        } 
        return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
        ImageView i = new ImageView(mContext); 
        if (position >= imagesArray.length) { 
            position = position % imagesArray.length; 
        } 
        i.setImageResource(imagesArray[position]); 
        i.setLayoutParams(new Gallery.LayoutParams(80, 80)); 
        i.setScaleType(ImageView.ScaleType.FIT_XY); 
        i.setBackgroundResource(mGalleryItemBackground); 
        return i; 
    } 

    public int checkPosition(int position) { 
        if (position >= imagesArray.length) { 
            position = position % imagesArray.length; 
        } 
        return position; 
    } 
}}

也有一些开发商已经做了这样的功能，你可以找到他们的博客源

Also some developers have done such a functionality and you can find sources on their blogs

的http://abhinavasblog.blogspot.com/2011/09/android-infinite-looping-gallery.html

http://blog.blundell-apps.com/infinite-scrolling-gallery /

这篇关于安卓：使图像库无限循环的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！