我正试图隐藏并在我的PagerAdapter项目中显示我的部分视图,但它没有做任何事情,没有GONE,VISIBLE或INVISIBLE。
public class FeedPagerAdapter extends PagerAdapter {
private final String KEY_GLOBAL_PREFS = "global";
@BindView(R.id.item) ImageView image;
@BindView(R.id.progress_bar) ProgressBar progressBar;
private final SlideActivity host;
private List<Thing> items;
private SharedPreferences sharedPreferences;
private int postition;
public FeedPagerAdapter(SlideActivity host, List<Thing> items){
this.host = host;
this.items = items;
sharedPreferences = host.getSharedPreferences(KEY_GLOBAL_PREFS, Context.MODE_PRIVATE);
}
@Override
public Object instantiateItem(final ViewGroup parent, int position) {
final View view = LayoutInflater.from(host).inflate(R.layout.item_slide_reddit_post, parent, false);
ButterKnife.bind(this, view);
progressBar.setVisibility(View.GONE);
return view;
}
@Override
public int getCount() {
return items.size();
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View)object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}
这是项目xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src:"..."/>
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
以下是从主机活动设置适配器的方法:
adapter = new FeedPagerAdapter(SlideActivity.this, List<> of items);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(position);
adapter.notifyDataSetChanged();
任何帮助都很棒
答案 0 :(得分:0)
再次查看item.xml,它查找我的图像是匹配父项,而您的进度条是包装内容。将图像更改为wrap_contet并确保显示进度条!
答案 1 :(得分:0)
在设置progressBar可见性之前,notifyDataSetChanged()
可能在行progressBar.setVisibility(View.GONE);
之后添加adapter.notifyDataSetChanged();
。
答案 2 :(得分:0)
我记得改变ProgressBar状态,你应该总是使用runOnUiThread()
getActivity().runOnUiThread(new Runnable() {
public void run() {
// implement View changes.
}
});
答案 3 :(得分:0)
似乎使用addEdge(Source, Target, Edge)
或标准Butterknife
设置findViewById
项无法更新视图,不确定原因,也许有人可以解释。每当需要在ProgressBar
中更改其可见性时,我会通过查找实际项目来解决问题:
PagerAdapter