我在自定义数组适配器类中使用转换视图模式以获得列表视图效率。然而，我面临的问题是，我有一个ImageView里面的行模板，其可见性决定了getView方法中的某些条件。当listview重用视图时，一切都变得混乱，我得到了imageView的可见性GONE，我希望它可见，反之亦然。解决这个问题的最佳方法是什么？我已经完成了所有this但没有任何有用的东西。我也试过使用两种不同的布局而没有运气。 这是我的getVIew方法
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
Typeface tf_title = Typeface.createFromAsset(context.getAssets(),
"Roboto-Regular.ttf");
Typeface tf_content = Typeface.createFromAsset(context.getAssets(),
"Roboto-Light.ttf");
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.default_user)
.showImageForEmptyUri(R.drawable.default_user)
.showImageOnFail(R.drawable.default_user).cacheOnDisc(true)
.considerExifParams(true).build();
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = mLayoutInflater.inflate(R.layout.temp, parent, false);
viewHolder = new ViewHolder();
viewHolder.tv_username = (TextView) convertView
.findViewById(R.id.tv_username);
viewHolder.tv_likes = (TextView) convertView
.findViewById(R.id.tv_likes);
viewHolder.tv_comment = (TextView) convertView
.findViewById(R.id.tv_comment);
viewHolder.tv_captions = (TextView) convertView
.findViewById(R.id.tv_captions);
viewHolder.tv_time = (TextView) convertView
.findViewById(R.id.tv_time);
viewHolder.img_photo = (ImageView) convertView
.findViewById(R.id.img_photo);
viewHolder.image_user = (ImageView) convertView
.findViewById(R.id.image_user);
viewHolder.img_like = (ImageView) convertView
.findViewById(R.id.img_like);
viewHolder.img_play_pause = (ImageView) convertView
.findViewById(R.id.img_play_pause);
viewHolder.playing_progress_bar = (ProgressBar) convertView
.findViewById(R.id.playing_progress_bar);
viewHolder.download_progres_bar = (ProgressBar) convertView
.findViewById(R.id.download_progres_bar);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
if (viewHolder.tv_time.getTag() == null
|| !viewHolder.tv_time.getTag().equals(
Integer.valueOf(position))) {
viewHolder.tv_time.setTag(Integer.valueOf(position));
} else {
// do nothing
}
if (viewHolder.download_progres_bar.getTag() == null) {
viewHolder.download_progres_bar
.setTag(values.get(position).isProgressing);
// Log.e("null", "null " + position);
} else if (!viewHolder.download_progres_bar.getTag().equals(
values.get(position).isProgressing)) {
// Log.e("changed", "changed " + position);
viewHolder.download_progres_bar
.setTag(values.get(position).isProgressing);
} else {
}
if ((Boolean) viewHolder.download_progres_bar.getTag() == true) {
viewHolder.download_progres_bar.setVisibility(View.VISIBLE); // protected
viewHolder.playing_progress_bar.setVisibility(View.GONE);
} else {
viewHolder.download_progres_bar.setVisibility(View.GONE); // protected
viewHolder.playing_progress_bar.setVisibility(View.VISIBLE);
}
if (viewHolder.playing_progress_bar.getTag() == null) {
viewHolder.playing_progress_bar
.setTag(values.get(position).isPlaying);
// Log.e("null", "null " + position);
} else if (!viewHolder.playing_progress_bar.getTag().equals(
values.get(position).isPlaying)) {
// Log.e("changed", "changed " + position);
viewHolder.playing_progress_bar
.setTag(values.get(position).isPlaying);
} else {
}
if ((Boolean) viewHolder.playing_progress_bar.getTag() == true) {
// viewHolder.download_progres_bar.setVisibility(View.GONE); //
// protected
// viewHolder.playing_progress_bar.setVisibility(View.VISIBLE);
viewHolder.playing_progress_bar.setProgress(values
.get((Integer) viewHolder.tv_time.getTag()).progress);
} else {
// Log.e("priniti", "not true");
// viewHolder.download_progres_bar.setVisibility(View.VISIBLE); //
// protected
viewHolder.playing_progress_bar.setProgress(100);
}
// Log.e("Name", "" + values.get(position).UserName);
viewHolder.tv_username.setText(values.get(position).UserName);
viewHolder.image_user.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.e("pos",""+position);
/*String s = (String) viewHolder.image_user.getTag();
int pos = Integer.parseInt(s.substring((s.lastIndexOf("~") + 1)));
newsFragment.notifyProgress(pos);*/
}
});
/*if (viewHolder.image_user.getTag() == null
|| !viewHolder.image_user.getTag().equals(
values.get(position).UserIcon + "~" + position)) {
ImageLoader.getInstance().displayImage(
values.get(position).UserIcon, viewHolder.image_user,
options, animateFirstListener);
viewHolder.image_user.setTag(values.get(position).UserIcon + "~"
+ position);
} else {
}*/
if (values.get((Integer) viewHolder.tv_time.getTag()).ObjectType
.equalsIgnoreCase("2")) {
// Log.e(""+(Integer) viewHolder.tv_time.getTag(),"two");
if (viewHolder.img_photo.getTag() == null
|| !viewHolder.img_photo.getTag().equals(
values.get(position).Data.replace("_t", "") + "~"
+ position))
{
viewHolder.img_photo.setVisibility(View.VISIBLE);
ImageLoader.getInstance().displayImage(
values.get(position).Data.replace("_t", ""),
viewHolder.img_photo, options, animateFirstListener);
viewHolder.img_photo.setTag(values.get(position).Data.replace(
"_t", "") + "~" + position);
}
} else {
// Log.e(""+(Integer) viewHolder.tv_time.getTag(),"seven");
viewHolder.img_photo.setVisibility(View.GONE);
}
if (values.get((Integer) viewHolder.tv_time.getTag()).VoiceStatus != null) {
viewHolder.img_play_pause.setVisibility(View.VISIBLE);
} else {
viewHolder.img_play_pause.setVisibility(View.GONE);
}
long time = getTime(values.get(position).Time);
viewHolder.tv_time.setText(calculateRelativeTime(time));
if (values.get(position).LikeCount == 0) {
viewHolder.tv_likes.setText("");
} else {
viewHolder.tv_likes.setText("" + values.get(position).LikeCount);
}
if (values.get(position).CommentCount == 0) {
viewHolder.tv_comment.setText("");
} else {
viewHolder.tv_comment.setText(""
+ values.get(position).CommentCount);
}
if (values.get(position).SelfLike.equalsIgnoreCase("1")) {
viewHolder.img_like.setImageResource(R.drawable.feed_like);
} else {
viewHolder.img_like.setImageResource(R.drawable.likes_gray);
}
viewHolder.tv_username.setTypeface(tf_title);
viewHolder.tv_captions.setTypeface(tf_content);
viewHolder.tv_comment.setTypeface(tf_content);
viewHolder.tv_time.setTypeface(tf_content);
viewHolder.tv_likes.setTypeface(tf_content);
if (values.get(position).ObjectType.equalsIgnoreCase("2")) {
viewHolder.tv_captions
.setText(Html.fromHtml(values.get(position).AdditionalData));
// Log.e("Feed adapter",""+position+" fg "+values.get(position).FeedID);
// viewHolder.img_photo.setTag(Integer.valueOf(position));
viewHolder.img_photo.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//String s = (String) viewHolder.image_user.getTag();
int rowPosition =4;/*= Integer.parseInt(s.substring((s
.lastIndexOf("~") + 1)));*/
Intent i = new Intent(context,
PhotoFeedDetailActivity.class);
i.putExtra("imgUrl", values.get(rowPosition).Data);
i.putExtra("photoid", values.get(rowPosition).ObjectID);
i.putExtra("type", "2");
i.putExtra("AdditionalData",
values.get(rowPosition).AdditionalData);
i.putExtra("CommentCount",
values.get(rowPosition).CommentCount);
i.putExtra("LikeCount", values.get(rowPosition).LikeCount);
// i.putExtra("selfLike",
// values.get(rowPosition).SelfLike);
i.putExtra("FeedID", values.get(rowPosition).FeedID);
i.putExtra("position", rowPosition);
if (scope.equalsIgnoreCase("masterProfile")) {
i.putExtra("fromType", 3);
i.putExtra("listInactivity", 0);
} else {
i.putExtra("fromType", 1);
}
context.startActivity(i);
}
});
} else {
// viewHolder.img_photo.setVisibility(View.GONE);
viewHolder.tv_captions
.setText(Html.fromHtml(values.get(position).Data));
viewHolder.tv_captions.setTag(Integer.valueOf(position));
viewHolder.tv_captions
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Integer rowPositionn = (Integer) v.getTag();
Intent i = new Intent(context,
PhotoFeedDetailActivity.class);
i.putExtra("imgUrl", values.get(rowPositionn).Data);
i.putExtra("photoid",
values.get(rowPositionn).ObjectID);
i.putExtra("type", "7");
i.putExtra("username",
values.get(rowPositionn).UserName);
i.putExtra("status", values.get(rowPositionn).Data);
i.putExtra("CommentCount",
values.get(rowPositionn).CommentCount);
i.putExtra("LikeCount",
values.get(rowPositionn).LikeCount);
i.putExtra("UserIcon",
values.get(rowPositionn).UserIcon);
i.putExtra("position", rowPositionn);
if (scope.equalsIgnoreCase("masterProfile")) {
i.putExtra("fromType", 3);
i.putExtra("listInactivity", 0);
} else {
i.putExtra("fromType", 1);
}
/*
* i.putExtra("selfLike",
* values.get(rowPositionn).SelfLike);
*/
i.putExtra("FeedID",
values.get(rowPositionn).FeedID);
context.startActivity(i);
}
});
}
viewHolder.tv_likes.setTag(Integer.valueOf(position));
viewHolder.tv_likes.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (values.get(position).ObjectType.equalsIgnoreCase("7")) {
if (values.get(position).LikeCount == 0) {
} else {
Integer rowPosition = (Integer) v.getTag();
Intent i = new Intent(context, LikersList.class);
i.putExtra("id", values.get(rowPosition).ObjectID);
i.putExtra("type", "7");
context.startActivity(i);
}
} else {
if (values.get(position).LikeCount == 0) {
} else {
Integer rowPosition = (Integer) v.getTag();
/*viewHolder.tv_likes.setText(""
+ values.get(position).LikeCount);*/
Intent i = new Intent(context, LikersList.class);
i.putExtra("id", values.get(rowPosition).ObjectID);
i.putExtra("type", "2");
context.startActivity(i);
}
}
}
});
viewHolder.img_like.setTag(Integer.valueOf(position));
viewHolder.img_like.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Integer rowPosition = (Integer) v.getTag();
if (values.get(position).ObjectType.equalsIgnoreCase("7")) {
// Toast.makeText(context, "clicked", Toast.).show();
if (values.get(position).SelfLike.equalsIgnoreCase("1")) {
} else {
if (selfClickCount == 0) {
if (scope.equalsIgnoreCase("masterProfile")) {
selfClickCount = 1;
UserProfileSectionn activity = (UserProfileSectionn) context;
activity.likePhoto(rowPosition);
} else {
selfClickCount = 1;
newsFragment.likePhoto(rowPosition);
}
} else {
Log.e("do", "nothing");
}
}
} else {
// Toast.makeText(context, "clicked", Toast.).show();
if (values.get(position).SelfLike.equalsIgnoreCase("1")) {
} else {
if (selfClickCount == 0) {
if (scope.equalsIgnoreCase("masterProfile")) {
selfClickCount = 1;
UserProfileSectionn activity = (UserProfileSectionn) context;
activity.likeStatus(rowPosition);
} else {
selfClickCount = 1;
newsFragment.likeStatus(rowPosition);
}
} else {
Log.e("do", "nothing");
}
}
}
}
});
viewHolder.tv_username.setTag(Integer.valueOf(position));
viewHolder.tv_username.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Integer rowPosition = (Integer) v.getTag();
if (values.get(position).ObjectType.equalsIgnoreCase("7")) {
Intent i = new Intent(context,
UserProfileSectionn.class);
i.putExtra("userId", values.get(rowPosition).UserID);
i.putExtra("titleName",
values.get(rowPosition).UserName);
// i.putExtra("isOther", true);
// i.putExtra("titleName",values.get(rowPosition).UserName);
context.startActivity(i);
/*
* Intent i = new Intent(context,
* UserProfileSectionn.class); i.putExtra("userId",
* values.get(rowPosition).UserID); i.putExtra("titleName",
* values.get(rowPosition).UserName); //
* i.putExtra("isOther", true); // i.putExtra("titleName"
* ,values.get(rowPosition).UserName);
* context.startActivity(i);
*/
} else {
if (scope.equalsIgnoreCase("masterProfile")) {
} else {
Intent i = new Intent(context,
UserProfileSectionn.class);
i.putExtra("userId", values.get(rowPosition).UserID);
i.putExtra("titleName",
values.get(rowPosition).UserName);
// i.putExtra("isOther", true);
// i.putExtra("titleName",values.get(rowPosition).UserName);
context.startActivity(i);
}
}
}
});
return convertView;
}
答案 0 :(得分：0)
如果ListView的某些行在某些情况下会有所不同，则可以使用RecyclerView代替。 RecyclerView.Adapter有一个方法，允许您决定每行的视图类型。请参阅：getItemViewType()
实施例：
public class ExampleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
@Override
public int getItemViewType(int position) {
//If position is divisible by three means that is a PrettyRow :)
if(position%3 == 0)
return 1;
else
return 2;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case 1: return new PrettyViewHolder();
case 2: return new UglyViewHolder();
}
}
class PrettyViewHolder extends RecyclerView.ViewHolder {
//TODO: set holder attributes, like a TextView or ImageView
}
class UglyViewHolder extends RecyclerView.ViewHolder {
//TODO: set holder attributes, like a TextView or ImageView
}
}
有关RecyclerListView的更多信息，请检查this example。
答案 1 :(得分：0)
这是一个常见的错误。 getView（）中的null检查所需要的只是：
if (convertView == null) {
convertView = mLayoutInflater.inflate(R.layout.temp, parent, false);
}
原因是convertView may = null，即使行项在某一点可见，但它不再被回收（由于虚拟内存方案）。因此，尽管你已经看到了convertView = null。所以需要这样的代码。
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder = new ViewHolder();
viewHolder.tv_username = (TextView) convertView.findViewById(R.id.tv_username);
我希望这很清楚。