[英]Update Viewpager data dynamically
我有我的自定义模型类的ArrayList,它通过使用AsyncTask
在Home_Fragment
从Internet拍摄的图像的URL实例化。
第一次创建列表时,网站上有12个项目/ URL。 现在,我在链接到我的ViewPager Adapter
的FullscreenView Activity
上传递这些内容
- >我已经设置了onLoadMoreListener
我Home_Fragment
,增加了更多的项目到ArrayList,现在我想那些添加到我的ViewPager Adapter
动态,我怎样才能做到这一点?
Home_Fragment
class ReadHTML extends AsyncTask<String, Integer, String> {
List list;
@Override
protected String doInBackground(String... params) {
try {
Document document = Jsoup.connect(params[0]).get();
Element wall = document.select("ul.postul").first();
//Log.i("LIST ", wall.toString());
Elements url = wall.getElementsByAttribute("src");
list = url.eachAttr("src");
for (int i = 0; i < list.size(); i++) {
wallpaperNumber++;
String string = //Dummy
String septemp[] = //Dummy2
sep[1] = "http://" + string
wallpapersModelArrayList.add(new WallpapersModel(
string,///
sep[1],
"jpg",
wallpaperNumber
));
}
}catch (Exception e){}
return null;
}
全屏活动
setContentView(R.layout.fullscreen_activity_view);
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = findViewById(R.id.view_pager);
arrayList = getIntent().getParcelableArrayListExtra("array");
final int pos = getIntent().getIntExtra("position", 0);
fullScreenSwipeAdapter = new
FullScreenSwipeAdapter(FullWallpaperViewActivity.this, arrayList);
viewPager.setAdapter(fullScreenSwipeAdapter);
viewPager.setCurrentItem(pos);
viewPager.setOnTouchListener(new View.OnTouchListener(){}
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {}
ViewPager适配器
public FullScreenSwipeAdapter(Activity activity, ArrayList<WallpapersModel> arrayList) {
this.activity = activity;
this.arrayList = arrayList;
Fresco.initialize(activity);
}
@Override
public int getCount() {
return this.arrayList.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == (object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = layoutInflater.inflate(R.layout.fullwallpaper_view_layout, container, false);
draweeView = v.findViewById(R.id.full_image_view);
draweeView.setImageURI(arrayList.get(position).getWallpaperFullURL());
container.addView(v);
return v;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((CoordinatorLayout)object);
}
将新项目添加到ArrayList之后,只需使用-将更改通知给适配器
arrayAdapter.notifyDataSetChanged();
首先创建一个新的ArrayAdapter实例,并设置所有新项,如下所示:
public class Activity() extends AppCompatActivity {
CustomArrayAdapter mArrayAdapter;
ViewPager mViewPager;
public void updateViewpager(){
mArrayAdapter = new ArrayAdapter(context, itemList); // old items with new items
mViewPager.setAdapter(mArrayAdapter);
mArrayAdapter.notifyDataSetChanged();
}
...
希望能帮助到你,
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