Question

我正在使用幻灯片放映显示图像..我想为其添加缩略图。下面我想要显示多少图像及其显示的特定图像。我经历了很多网站但是找不到任何有用的东西

public class ImageAdapter extends PagerAdapter {
    Context context;
    int[] GalImages = new int[]{
        R.drawable.chokkanatha1,
        R.drawable.chokkanatha2,
        R.drawable.chokkanatha3,
        R.drawable.chokkanatha4,
        R.drawable.chokkanatha5,
        R.drawable.chokkanatha6};

    public ImageAdapter(Context context,String list1){
        this.context=context;
       String list =list1;
    }

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

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

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        ImageView imageView = new ImageView(context);
        //imageView.getItem(myViewPager.getCurrentItem());
        // int padding = context.getResources().getDimensionPixelSize(R.dimen.padding_medium);
        // imageView.setPadding(padding, padding, padding, padding);
        imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
        imageView.setImageResource(GalImages[position]);
        ((ViewPager) container).addView(imageView, 0);

        System.out.println("position:"+position);
        return imageView;
    }

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

Answer 1

我的建议是在LinearLayout中加instatiateItem()而不只是ImageView

将LinearLayout方向设置为垂直并添加ImageView，然后在其下方添加另一个LinearLayout水平方向，并在此内部布局中添加5（或您喜欢多少）{ {1}}您将在其中绘制缩略图。

你应该得到这样的东西：

ImageView

根据现在显示的图像，您应该在内部public Object instantiateItem(ViewGroup container, int position) { // this is your layout for the Item final LinearLayout outerLayout = new LinearLayout(context); outerLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); outerLayout.setOrientation(LinearLayout.VERTICAL); // this is your main picture ImageView imageView = new ImageView(context); imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE); imageView.setImageResource(GalImages[position]); // add the picture to the layout outerLayout.addView(imageView); final LinearLayout innerLayout = new LinearLayout(context); innerLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); innerLayout.setOrientation(LinearLayout.HORIZONTAL); // thumbnail for the previous image ImageView thumbnailBefore = new ImageView(context); thumbnailBefore.setScaleType(ImageView.ScaleType.CENTER_INSIDE); thumbnailBefore.setImageResource("enter your thumbnail for image with id position - 1"); // thumbnail for the current image ImageView thumbnailThis = new ImageView(context); thumbnailThis.setScaleType(ImageView.ScaleType.CENTER_INSIDE); thumbnailThis.setImageResource("enter your thumbnail for image with id position"); // thumbnail for the next image ImageView thumbnailAfter = new ImageView(context); thumbnailAfter.setScaleType(ImageView.ScaleType.CENTER_INSIDE); thumbnailAfter.setImageResource("enter your thumbnail for image with id position + 1"); // add the thumbnails for the images to the inner layout (to appear below your main picture) innerLayout.addView(thumbnailBefore); innerLayout.addView(thumbnailThis); innerLayout.addView(thumbnailAfter); // add the inner layout to the whole layout outerLayout.addView(innerLayout); ((ViewPager) container).addView(outerLayout, 0); return imageView; }之前和之后填充图片。（注意缩略图位置的LinearLayout）

很抱歉没有向您提供确切的密码，我现在不在我的电脑上。

编辑：我发布了代码示例，用于显示上一张和下一张图片。此外，如果您没有图片的缩略图，请参阅此答案以获取更多详细信息Make thumbnail

ImageAdapter使用thumnails扩展了PagerAdapter

1 个答案: