ViewHolder对偶数和奇数位置充气布局 [英] ViewHolder inflating layout on even and odd position
本文介绍了ViewHolder对偶数和奇数位置充气布局的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要两个布局膨胀的偶数和奇数的使用ViewHolder列表视图项目的立场的基础。在偶数位置，我需要一个不同的布局，并在奇数位具有相同的元素，但不同的布局另一个。我实现它，但是，它给我随机布局在不同的位置，不论其地位。需要做来解决它是什么。谢谢你。
公共SimpleAdapter（ArrayList的＆LT; WishListData＆GT; wishDataList，上下文的背景下，
ListView的swipelistview）{
超（背景下，android.R.layout.simple_list_item_1，wishDataList）;
notifyDataSetChanged（）;
SimpleAdapter.wishListData = wishDataList;
this.swipelistview = swipelistview; 米preferences =新的preferences（背景）;
SCREEN_WIDTH = M preferences.getScreenWidth（）;
SCREEN_HEIGHT = M preferences.getScreenHeight（）;
mFunctions =新UserFunctions（）;
this.context =背景;
imageloader1 =新ImageLoader1（背景）;
userImageLoader =新UserImageLoader（背景）;}@覆盖
公共查看getView（最终诠释的立场，观点convertView，父母的ViewGroup）{ ViewHolder viewHolder = NULL;
查看排= convertView;
如果（行== NULL）{
LayoutInflater充气=（（活动）上下文）.getLayoutInflater（）;
的System.out.println（位置+位置）;
如果（（位置％2）== 0）{ 行= inflater.inflate（R.layout.single_wish_view_right，父母，
假）; }否则如果（（位置％2）== 1）{
排吹气=
.inflate（R.layout.single_wish_view，父母，假）; }
viewHolder =新ViewHolder（）;
viewHolder.back =（LinearLayout中）一行
.findViewById（R.id.back）;
viewHolder.lenear =（LinearLayout中）一行
.findViewById（R.id.linear）; viewHolder.front =（RelativeLayout的）行
.findViewById（R.id.front）;
viewHolder.likeButton =（ImageButton的）行
.findViewById（R.id.likemain）;
viewHolder.deathWish =（TextView中）一行
.findViewById（R.id.death_wish）;
viewHolder.time =（TextView中）一行
.findViewById（R.id.time_wish）;
viewHolder.name =（TextView中）row.findViewById（R.id.name1）;
viewHolder.commentButton =（ImageButton的）行
.findViewById（R.id.comment）;
viewHolder.shareButton =（ImageButton的）行
.findViewById（R.id.sharemain）;
viewHolder.helpButton =（ImageButton的）行
.findViewById（R.id.help）; viewHolder.profilePic =（ImageView的）行
.findViewById（R.id.profile_image）;
viewHolder.likecount =（TextView中）一行
.findViewById（R.id.likecountadapter）;
commentcount =（TextView中）一行
.findViewById（R.id.commentcountadapter）;
viewHolder.tagImg =（ImageView的）行
.findViewById（R.id.tag_arrow）;
viewHolder.image1 =（ImageView的）行
.findViewById（R.id.image1）;
viewHolder.image2 =（ImageView的）行
.findViewById（R.id.image2）;
row.setTag（viewHolder）;
}其他{
viewHolder =（ViewHolder）row.getTag（）;
}
mWishesData = wishListData.get（位置）;
viewHolder.wishlikecount = mWishesData.getDeathWishLike（）;
如果（（位置％4）== 0）{
viewHolder.lenear.setBackgroundColor（Color.rgb（255，168，0））;
viewHolder.back.setBackgroundResource（R.drawable.a2bg）;
viewHolder.tagImg.setBackgroundResource（R.drawable.a11）;
viewHolder.front.setBackgroundColor（Color.rgb（255，168，0））; }否则如果（（位置％4）== 1）{
viewHolder.lenear.setBackgroundColor（Color.rgb（253，81，43））;
viewHolder.back.setBackgroundResource（R.drawable.a3bg）;
viewHolder.tagImg.setBackgroundResource（R.drawable.a21）;
viewHolder.front.setBackgroundColor（Color.rgb（253，81，43））; // viewHolder.Adlayout.invalidate（）;
// viewHolder.Adlayout.setVisibility（View.GONE）;
}否则如果（（位置％4）== 2）{
viewHolder.lenear.setBackgroundColor（Color.rgb（155，89，182））;
viewHolder.back.setBackgroundResource（R.drawable.a4bg）;
viewHolder.tagImg.setBackgroundResource（R.drawable.a31）;
viewHolder.front.setBackgroundColor（Color.rgb（155，89，182））; }否则如果（（位置％4）== 3）{
viewHolder.lenear.setBackgroundColor（Color.rgb（46，204，113））;
viewHolder.back.setBackgroundResource（R.drawable.a1bg）;
viewHolder.tagImg.setBackgroundResource（R.drawable.a41）;
viewHolder.front.setBackgroundColor（Color.rgb（46，204，113））;
}
查看持有人：
公共静态类ViewHolder {
公众诠释wishlikecount;
公众诠释wishcommentcount;
回来的LinearLayout，lenear;
RelativeLayout的前面;
TextView的死亡之愿;
的ImageButton likeButton，commentButton，shareButton，helpButton;
TextView的时间，名称，likecount;
ImageView的tagImg，此搜索，图像2，profilePic;
}
解决方案
问题是，当意见被回收，ListView控件可以给你回来时，你预期左布局的正确的布局。你应该重写<一个href=\"https://developer.android.com/reference/android/widget/Adapter.html#getItemViewType(int)\"><$c$c>getItemViewType()和<一个href=\"https://developer.android.com/reference/android/widget/Adapter.html#getViewTypeCount()\"><$c$c>getViewTypeCount()在你的适配器实现;这些方法确保ListView的为您提供了相应的视图类型时，它提供了一个循环，以 getView（）
@覆盖
公众诠释getViewTypeCount（）{
//返回视图类型的总数。这个值不应该在运行时改变
返回2;
}@覆盖
公众诠释getItemViewType（INT位置）{
//返回0和之间的值（getViewTypeCount - 1）
返回位置％2;
}@覆盖
公共查看getView（INT位置，查看convertView，容器的ViewGroup）{
INT layoutResource; //由视图类型确定
INT viewType = getItemViewType（位置）;
开关（viewType）{
情况下0：
layoutResource = R.layout.list_item_even;打破;
情况1：
layoutResource = R.layout.list_item_odd;打破;
} ViewHolder持有人;
如果（convertView！= NULL）{
支架=（ViewHolder）convertView.getTag（）;
}其他{
convertView = inflater.inflate（layoutResource，集装箱，FALSE）;
持有人=新ViewHolder（）;
...
convertView.setTag（保持器）;
}
...
返回convertView;
}
I need two layout to inflate on basis of even and odd position of listview items using ViewHolder. At even position I need a different layout and at Odd position another one having same elements but different layout. I implemented it, however, it gives me random layouts at different positions irrespective of their position. What needs to be done to resolve it. Thanks.
public SimpleAdapter(ArrayList<WishListData> wishDataList, Context context,
ListView swipelistview) {
super(context, android.R.layout.simple_list_item_1, wishDataList);
notifyDataSetChanged();
SimpleAdapter.wishListData = wishDataList;
this.swipelistview = swipelistview;
mPreferences = new Preferences(context);
SCREEN_WIDTH = mPreferences.getScreenWidth();
SCREEN_HEIGHT = mPreferences.getScreenHeight();
mFunctions = new UserFunctions();
this.context = context;
imageloader1 = new ImageLoader1(context);
userImageLoader = new UserImageLoader(context);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
View row = convertView;
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
System.out.println("position "+ position);
if ((position % 2) == 0) {
row = inflater.inflate(R.layout.single_wish_view_right, parent,
false);
} else if ((position % 2) == 1){
row = inflater
.inflate(R.layout.single_wish_view, parent, false);
}
viewHolder = new ViewHolder();
viewHolder.back = (LinearLayout) row
.findViewById(R.id.back);
viewHolder.lenear = (LinearLayout) row
.findViewById(R.id.linear);
viewHolder.front = (RelativeLayout) row
.findViewById(R.id.front);
viewHolder.likeButton = (ImageButton) row
.findViewById(R.id.likemain);
viewHolder.deathWish = (TextView) row
.findViewById(R.id.death_wish);
viewHolder.time = (TextView) row
.findViewById(R.id.time_wish);
viewHolder.name = (TextView) row.findViewById(R.id.name1);
viewHolder.commentButton = (ImageButton) row
.findViewById(R.id.comment);
viewHolder.shareButton = (ImageButton) row
.findViewById(R.id.sharemain);
viewHolder.helpButton = (ImageButton) row
.findViewById(R.id.help);
viewHolder.profilePic = (ImageView) row
.findViewById(R.id.profile_image);
viewHolder.likecount = (TextView) row
.findViewById(R.id.likecountadapter);
commentcount = (TextView) row
.findViewById(R.id.commentcountadapter);
viewHolder.tagImg = (ImageView) row
.findViewById(R.id.tag_arrow);
viewHolder.image1 = (ImageView) row
.findViewById(R.id.image1);
viewHolder.image2 = (ImageView) row
.findViewById(R.id.image2);
row.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) row.getTag();
}
mWishesData = wishListData.get(position);
viewHolder.wishlikecount = mWishesData.getDeathWishLike();
if ((position % 4) == 0) {
viewHolder.lenear.setBackgroundColor(Color.rgb(255, 168, 0));
viewHolder.back.setBackgroundResource(R.drawable.a2bg);
viewHolder.tagImg.setBackgroundResource(R.drawable.a11);
viewHolder.front.setBackgroundColor(Color.rgb(255, 168, 0));
} else if ((position % 4) == 1) {
viewHolder.lenear.setBackgroundColor(Color.rgb(253, 81, 43));
viewHolder.back.setBackgroundResource(R.drawable.a3bg);
viewHolder.tagImg.setBackgroundResource(R.drawable.a21);
viewHolder.front.setBackgroundColor(Color.rgb(253, 81, 43));
// viewHolder.Adlayout.invalidate();
// viewHolder.Adlayout.setVisibility(View.GONE);
} else if ((position % 4) == 2) {
viewHolder.lenear.setBackgroundColor(Color.rgb(155, 89, 182));
viewHolder.back.setBackgroundResource(R.drawable.a4bg);
viewHolder.tagImg.setBackgroundResource(R.drawable.a31);
viewHolder.front.setBackgroundColor(Color.rgb(155, 89, 182));
} else if ((position % 4) == 3) {
viewHolder.lenear.setBackgroundColor(Color.rgb(46, 204, 113));
viewHolder.back.setBackgroundResource(R.drawable.a1bg);
viewHolder.tagImg.setBackgroundResource(R.drawable.a41);
viewHolder.front.setBackgroundColor(Color.rgb(46, 204, 113));
}
View Holder :
public static class ViewHolder {
public int wishlikecount;
public int wishcommentcount;
LinearLayout back, lenear;
RelativeLayout front;
TextView deathWish;
ImageButton likeButton, commentButton, shareButton, helpButton;
TextView time, name, likecount;
ImageView tagImg, image1, image2, profilePic;
}
解决方案
The problem is when the views are recycled, ListView can give you back a "right" layout when you expected a "left" layout. You should override getItemViewType() and getViewTypeCount() in your adapter implementation; these methods ensure that ListView gives you the appropriate view type when it provides a recycled view to getView()
@Override
public int getViewTypeCount() {
// return the total number of view types. this value should never change at runtime
return 2;
}
@Override
public int getItemViewType(int position) {
// return a value between 0 and (getViewTypeCount - 1)
return position % 2;
}
@Override
public View getView(int position, View convertView, ViewGroup container) {
int layoutResource; // determined by view type
int viewType = getItemViewType(position);
switch(viewType) {
case 0:
layoutResource = R.layout.list_item_even; break;
case 1:
layoutResource = R.layout.list_item_odd; break;
}
ViewHolder holder;
if (convertView != null) {
holder = (ViewHolder) convertView.getTag();
} else {
convertView = inflater.inflate(layoutResource, container, false);
holder = new ViewHolder();
...
convertView.setTag(holder);
}
...
return convertView;
}
这篇关于ViewHolder对偶数和奇数位置充气布局的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
