横滑_人生横滑-优快云博客

本文介绍了一个基于Android的应用中实现动态UI切换和后台数据加载的方法。通过使用ViewPager和自定义适配器实现了流畅的页面切换效果，并利用Gson进行JSON数据解析，同时展示了如何加载和显示图片。此外，还包含了创建弹出窗口的具体步骤。

for (int i=0;i<titles.length;i++){
    textView = new TextView(this);
    textView.setText(titles[i]);
    textView.setTextSize(20);
    textView.setId(i);
    textView.setTextColor(Color.BLACK);

    textView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                textView.setTextColor(Color.RED);
            int id = v.getId();
            viewPager.setCurrentItem(id);
        }
    });
    if (i==0){
        textView.setTextColor(Color.RED);
    } else {
        textView.setTextColor(Color.BLACK);
    }
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    layoutParams.setMargins(20,50,20,10);
    linearLayout.addView(textView,layoutParams);
}

class ContentModel {
    private int imageView;
    private String text;
    private int id;

}

list = new ArrayList<>();
list.add(new ContentModel(R.mipmap.ic_launcher, "新闻", 1));

Gson gson = new Gson();
News news = gson.fromJson(json, News.class);
List<News.BannerBean> banner = news.getBanner();
for (int i=0;i<banner.size(); i++){
String image_url = banner.get(i).getImage_url();
ImageView imageView = new ImageView(getActivity());
DisplayImageOptions options = ImageLoaderUtils.getOptions();
ImageLoader.getInstance().displayImage(image_url,imageView,options);
list.add(imageView);
}
MyAdapter adapter = new MyAdapter(getActivity(),list);
vp.setAdapter(adapter);
}else if (msg.what == 1){
int i = vp.getCurrentItem();
vp.setCurrentItem(++i);
handler.sendEmptyMessageDelayed(1,1000);

public class MyAdapter extends PagerAdapter{
private Context context;
private List<ImageView> list;

public MyAdapter(Context context, List<ImageView> list) {
this.context = context;
this.list = list;
}

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

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

@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView = list.get(position % list.size());
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
container.addView(imageView);
return imageView;
}

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

View view = View.inflate(HomepageActivity.this,R.layout.popup_windowone,null);

PopupWindow popupWindow = new PopupWindow(view, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
popupWindow.setBackgroundDrawable(new ColorDrawable(Color.BLACK));
popupWindow.setOutsideTouchable(true);
popupWindow.setTouchable(true);
popupWindow.showAsDropDown(v);