我在listview项目中使用view pager。我想在视图寻呼机中显示图像，但延迟加载不能使用它。请给我任何解决方案。我尝试了很多延迟加载文件，但有些正在运行。有些人持有UI。
我现在使用的代码工作正常，但第一次没有显示图像。我必须向下滚动列表视图然后向上滚动然后才显示。我不知道问题是什么，请给我解决一下我必须做的事情？
我发布了适配器代码： -
这是我的getview代码：
public View getView(final int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater mInflater = (LayoutInflater) objProp.activity
.getApplicationContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
v = mInflater.inflate(R.layout.adapter_walllayout, null);
}
// Get Controls
final viewHolder vh = new viewHolder();
vh.txtview_Question = (TextView) v.findViewById(R.id.textView1);
vh.textview_CommentCount = (TextView) v
.findViewById(R.id.textVew_WallTotalComments);
vh.textview_LikeCount = (TextView) v
.findViewById(R.id.textVew_WallTotalokay);
vh.ViewPager_Images = (ViewPager) v.findViewById(R.id.pager);
vh.imageview_Profile = (ImageView) v
.findViewById(R.id.imageview_userImage);
vh.textview_PostDate = (TextView) v
.findViewById(R.id.textView_PostDate);
vh.textview_UserName = (TextView) v
.findViewById(R.id.textVew_WallUserName);
// SetDatato controls
// Set Data
vh.txtview_Question
.setText(objProp.wallDataList.get(position).wallPost_Name);
vh.txtview_Question.setTypeface(fontsFamily.getFont(
objProp.activity.getApplicationContext(), true));
vh.textview_UserName
.setText(objProp.wallDataList.get(position).wallPost_User_Name);
vh.textview_UserName.setTypeface(fontsFamily.getFont(
objProp.activity.getApplicationContext(), true));
final Vector<View> pages = new Vector<View>();
objProp.activity.runOnUiThread(new Runnable() {
@Override
public void run() {
vh.ViewPager_Images.setOffscreenPageLimit(4);
for (int i = 0; i < objProp.wallDataList.get(position).wallPost_Images_Data
.size(); i++) {
final int imagePosion = i;
LayoutInflater mInflaterImage = (LayoutInflater) objProp.activity
.getApplicationContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
View vImage = mInflaterImage.inflate(
R.layout.wallimagepageradaper, null);
ImageView imageView = (ImageView) vImage
.findViewById(R.id.imageView1);
imageView.setTag(objProp.wallDataList.get(position).wallPost_Images_Data
.get(i).qst_Wall_Image);
CheckBox chk = (CheckBox) vImage
.findViewById(R.id.checkBox1);
/*
* loadLooksImages.fetchDrawableOnThread(objProp.wallDataList
* .get(position).wallPost_Images_Data
* .get(i).qst_Wall_Image, imageView);
*/
imageLoader_RelativeLayout.DisplayImage(
objProp.wallDataList.get(position).wallPost_Images_Data
.get(i).qst_Wall_Image, imageView);
/*imageLoader_RelativeLayout.DisplayImage(
objProp.wallDataList.get(position).wallPost_Images_Data
.get(i).qst_Wall_Image, imageView);
*/
// Get Controls
vh.percentageLayout = (RelativeLayout) vImage
.findViewById(R.id.layoutPercent);
vh.percentageLayout.setVisibility(View.GONE);
vh.percentageLayout.setId(objProp.wallDataList
.get(position).wallPost_Images_Data
.get(imagePosion).qst_Wall_ImageID);
vh.textView_Percentage = (TextView) vImage
.findViewById(R.id.textView_PercentCount);
vh.textView_percentVoteCount = (TextView) vImage
.findViewById(R.id.textView1_PercentVoteCount);
// Set Data
Double d = Double.parseDouble(objProp.wallDataList
.get(position).wallPost_Images_Data.get(i).qst_Wall_Image_Percentage);
int val = d.intValue();
vh.textView_Percentage.setText(val + "%");
vh.textView_Percentage.setTypeface(fontsFamily.getFont(
objProp.activity.getApplicationContext(), true));
vh.textView_percentVoteCount.setTypeface(fontsFamily
.getFont(objProp.activity.getApplicationContext(),
true));
vh.textView_percentVoteCount.setText(objProp.wallDataList
.get(position).wallPost_Images_Data.get(i).qst_Wall_Image_LikeCount
+ " Votes");
chk.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
new Service_LikeImage(objProp.activity)
.execute(objProp.wallDataList.get(position).wallPost_Images_Data
.get(imagePosion).qst_Wall_ImageID
+ "");
RelativeLayout lay = (RelativeLayout) objProp.activity
.findViewById(objProp.wallDataList
.get(position).wallPost_Images_Data
.get(imagePosion).qst_Wall_ImageID);
lay.setVisibility(View.VISIBLE);
}
});
// //system.out.println("OKKKKKK "+i);
pages.add(vImage);
}
}
});
// system.out.println("aaa "+pages.size());
CustomPagerAdapter adap = new CustomPagerAdapter(
objProp.activity.getApplicationContext(), pages);
vh.ViewPager_Images.setAdapter(adap);
vh.textview_CommentCount.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(objProp.activity, OkayComments.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra("wallPostPosition", position);
intent.putExtra("imageNumber", imagePsotioninPager);
objProp.activity.startActivity(intent);
}
});
vh.textview_LikeCount.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(objProp.activity, Results.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra("qcode",
objProp.wallDataList.get(position).wallPost_ID);
objProp.activity.startActivity(intent);
}
});
imageLoader.DisplayImage(
objProp.wallDataList.get(position).wallPost_User_Image,
vh.imageview_Profile);
String totComments = objProp.wallDataList.get(position).wallPost_Images_Data
.get(0).qst_Wall_Image_CommentCount + "";
vh.textview_CommentCount.setText(totComments + " Comments");
vh.textview_CommentCount.setTypeface(fontsFamily.getFont(
objProp.activity.getApplicationContext(), true));
vh.textview_LikeCount
.setText(objProp.wallDataList.get(position).wallPost_Images_Data
.get(0).qst_Wall_Image_LikeCount + " Okay");
vh.textview_LikeCount.setTypeface(fontsFamily.getFont(
objProp.activity.getApplicationContext(), true));
return v;
}
public class viewHolder {
TextView txtview_Question;
TextView textview_CommentCount;
TextView textview_LikeCount;
TextView textview_UserName;
TextView textview_PostDate;
ViewPager ViewPager_Images;
ImageView imageview_Profile;
TextView textView_Percentage;
TextView textView_percentVoteCount;
RelativeLayout percentageLayout;
// Image in ViewPager
ImageView imageView_PostImage;
}
答案 0 :(得分：12)
首先 ..我不太确定这有多严重，因为您正在尝试将视图寻呼机用作列表视图项。并不是说它无法完成，而只是因为这里有太多的层次。希望您能理解这段代码中的工作和努力，我希望这有助于解决您的问题。所以请尽情享受代码.. :)
1）在这种情况下有2个适配器。 首先是ListView ViewPager的第二个
2）两个适配器都有不同的功能和列表项。
3）您在另一个适配器中使用一个适配器。
4）然后使用最终适配器给ListView充气并设置适配器...：D
以下是代码的执行方式：我将逐步完成
第1步：制作一个简单的模型类：
public class ModelClass {
private String titleToDisplay;
public ModelClass(String question) {
super();
this.titleToDisplay = question;
}
public String getTitleToDisplay() {
return titleToDisplay;
}
public void setTitleToDisplay(String titleToDisplay) {
this.titleToDisplay = titleToDisplay;
}
}
步骤2：制作视图寻呼机适配器并对其进行充气将是模型类项目。这是基本视图寻呼机适配器!!
public class ViewPagerAdapter extends PagerAdapter {
ArrayList<ModelClass> arrayModelClasses = new ArrayList<ModelClass>();
@SuppressLint("NewApi")
@Override
public void finishUpdate(ViewGroup container) {
// TODO Auto-generated method stub
super.finishUpdate(container);
}
public ViewPagerAdapter() {
super();
}
public ViewPagerAdapter(ArrayList<ModelClass> arrayModelClasses) {
super();
this.arrayModelClasses = arrayModelClasses;
}
@Override
public int getCount() {
return arrayModelClasses.size();
}
@Override
public boolean isViewFromObject(View collection, Object object) {
return collection == ((View) object);
}
@Override
public Object instantiateItem(View collection, int position) {
// Inflating layout
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.drawer_list_item, null);
TextView itemText = (TextView) view.findViewById(R.id.title);
try {
itemText.setText(arrayModelClasses.get(position)
.getTitleToDisplay());
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
((ViewPager) collection).addView(view, 0);
return view;
}
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView((View) object);
}
}
第3步：为ListView制作适配器
注意：这是我使用上一个适配器的地方，在这个适配器中我使用视图寻呼机作为列表项。
public class ListViewPagerAdapter extends ArrayAdapter<ModelClass> {
ViewPagerAdapter mViewPagerAdapter;
private Context context;
private ArrayList<ModelClass> navigationItems;
private int selectedIndex;
public ListViewPagerAdapter(Context context,
ArrayList<ModelClass> navigationItems) {
super(context, R.layout.view_pager_list_view, navigationItems);
this.context = context;
this.navigationItems = navigationItems;
}
@Override
public int getCount() {
return navigationItems.size();
}
public void setSelectedIndex(int position) {
selectedIndex = position;
notifyDataSetChanged();
}
@Override
public ModelClass getItem(int position) {
return navigationItems.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@SuppressLint("NewApi")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.view_pager_list_view, null);
}
ViewPager vp = (ViewPager) convertView.findViewById(R.id.list_pager);
if (selectedIndex != -1 && position == selectedIndex) {
vp.setBackground(getContext().getResources().getDrawable(
R.drawable.gradient_selected));
} else {
vp.setBackground(getContext().getResources().getDrawable(
R.drawable.gradient));
}
mViewPagerAdapter = new ViewPagerAdapter(navigationItems);
vp.setAdapter(mViewPagerAdapter);
return convertView;
}
}
第4步：我将此最后一个适配器（＆＃34; ListViewPagerAdapter＆＃34;）设置为我的列表视图。
注意：这里我在我的一个片段中使用此适配器。您可以在普通的活动类上使用它，它也可以使用。
public class CampaignView extends Fragment {
ListViewPagerAdapter listViewPagerAdapter;
public CampaignView() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View campainview = inflater.inflate(R.layout.campaignview, container,
false);
return campainview;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
String[] s = { "a", "b", "c", "d", "b", "c", "d", "b", "c", "d", "b",
"c", "d", "b", "c", "d", "b", "c", "d" };
ArrayList<ModelClass> aList = new ArrayList<ModelClass>();
for (String s1 : s) {
aList.add(new ModelClass(s1));
}
ListView lv1 = (ListView) getActivity().findViewById(
R.id.campaignListView);
// lv1.setAdapter(new ArrayAdapter<String>(getActivity(),
// android.R.layout.simple_list_item_1,aList));
listViewPagerAdapter = new ListViewPagerAdapter(getActivity(), aList);
lv1.setAdapter(listViewPagerAdapter);
}
}
最后，此代码的布局代码段很少。
首先：列表视图本身：
<ListView
android:id="@+id/campaignListView"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
第二： ViagerLayoutItem（行项目）：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v4.view.ViewPager
android:id="@+id/list_pager"
android:layout_width="match_parent"
android:layout_height="400dp"
android:paddingTop="10dp"/>
</LinearLayout>
最后：列表视图项目的抽屉列表项目：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#303030"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#303030"
android:orientation="horizontal" >
<ImageView
android:id="@+id/icon"
android:layout_width="25dp"
android:layout_height="wrap_content"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:contentDescription="Icon"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="@android:color/darker_gray"
android:minHeight="18dp"
android:padding="20dp"
android:paddingRight="40dp"
android:text="home"
android:textColor="#33b5e5"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
工作形象：
Images http://imageshack.com/a/img855/109/5w7e.png Images http://imageshack.com/a/img849/860/8j5t.png
如果对此代码存在任何疑问，请与我们联系。我很乐意回答。
希望你喜欢它，我希望你能尽力实现这个......我在这段代码上花了几分钟。希望这能帮助每个人......祝你好运.. :)
答案 1 :(得分：-1)
有一个示例github存储库，我发现在尝试与此类似的东西时非常有用。它非常有用。您可以使用此link
进行构建在示例中，
您将看到viewpager被添加为列表元素。滚动侦听器实现使listview可滚动，否则不向下滚动
