Question

In my android app I have this scenario - I have a Gallery where I have to display some images. I have a total of 13 images each of which I get by calling a function with some parameters.

Now in my adapter for gallery I can only pass 7 images at a time and when the user scrolls through the gallery I should update the gallery items. eg. My images are {0,1,2,3,4,5,6,7,8,9,10,11,12}.

First time I can only get and show {3,4,5,6,7,8,9} with 6 at center-display now if the user scrolls rightwards I want to remove 3 from the left end and add 10 at the right end so that the adapter array becomes {4,5,6,7,8,9,10} with 7 at center and so on.

同样,如果用户向左滚动,我想从右端删除9个,在左端添加2个,使适配器阵列变成 {2,3,4,5,6,7,8},中间有5个。

我用链接列表来储存我的东西

How can I achieve this. Please Help.

Answer 1

只要使用自定义类扩展画廊, 覆盖 onFling () 检测手势( 左或右), 并操作移除。

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    if (Math.abs(velocityX) > Math.abs(velocityY)) {
        // This is an horizontal fling
            if (velocityX < 0) {
                // From left to right => go forward 
                //  remove 3
                return true;
            } else if (velocityX > 0) {
                // From right to left => go backward
                //  remove 7
                return true;
            }
    } else {
        // This is a vertical fling
    }

    return false;
}

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