安卓：使图像库无限循环

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

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