ViewPager with Custom PageAdapter，如何使用XML文件而不是在java中定义布局

Question

我正在编写一个四重奏游戏，因此我需要一个包含每张卡片所有属性的画廊。我找到了一个带有自定义PagerAdapter的ViewPager示例：http://android-er.blogspot.de/2014/04/example-of-viewpager-with-custom.html

对于简单的图库视图，这非常好，但我想包含一个 XML 文件（例如我的游戏活动），而不是显式定义所有布局参数。感谢您的任何想法！

这是我的适配器类：

private class MyPagerAdapter extends PagerAdapter {
        int numberOfPages = cards.size();
        int[] backgroundcolor = {
                0xFF101010};
        @Override
        public int getCount() {
            return numberOfPages;
        }
        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            //select Card on current position from List of cards
            final Card tempCard = cards.get(position);
            //set TextView with deck title
            TextView textView = new TextView(DeckViewActivity.this);
            textView.setTextColor(Color.WHITE);
            textView.setTextSize(30);
            textView.setTypeface(Typeface.DEFAULT_BOLD);
            textView.setText(tempCard.getTitle() + " (" + String.valueOf(position + 1) + "/" + cards.size() + ")");

            //set ImageView with deckcover
            ImageView imageView = new ImageView(DeckViewActivity.this);
            ViewGroup.LayoutParams imageParams = new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
            imageView.setLayoutParams(imageParams);
            int finalHeight = viewPager.getMeasuredHeight();
            int finalWidth = viewPager.getMeasuredWidth();
            //Load Bitmap from assets
            InputStream inputStream = null;
            try {
                inputStream = getAssets().open(tempCard.getPicture());
                imageView.setImageBitmap(decodeSampledBitmapFromResource(inputStream, finalWidth, finalHeight));
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            //imageView.setImageResource(res[position]);

            LinearLayout layout = new LinearLayout(DeckViewActivity.this);
            layout.setOrientation(LinearLayout.VERTICAL);
            ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
            layout.setBackgroundColor(backgroundcolor[0]);
            layout.setLayoutParams(layoutParams);
            layout.addView(textView);
            layout.addView(imageView);
            final int page = position;
            layout.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v) {
                }});
            container.addView(layout);
            return layout;
        }
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((LinearLayout)object);
        }
    }

Answer 1

您的instantiateItem()方法可以使用LayoutInflater（通过getLayoutInflater()从您的活动中获取）来膨胀布局，而不是在 Java 中设置小部件。

或者，如果将布局包装在片段中，则可以使用 FragmentPagerAdapter 。