在我的布局中，我有一个用于手机的项目和最多10列用于平板电脑的项目。当我在手机上测试它时，我不会遇到任何滞后现象，但平板电脑上的滞后是明显的 我想知道以下措施是否会使listview消耗更少的资源 通常我的适配器中总是有以下行：
holder.tvTitle.setText("some text")
如果我将用
替换它if(!holder.title.equals(data.get(position).getTitle())){
holder.title = data.get(position).getTitle();
holder.tvTitle.setText(holder.title);
}
public class FragmentArtistAdapter extends BaseAdapter {
private List<ArtistsEntity> data;
private Context context;
private DisplayImageOptions options;
public FragmentArtistAdapter(Context activity, List<ArtistsEntity> data) {
this.data = data;
this.context = activity;
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.artist_stub)
.showImageForEmptyUri(R.drawable.artist_stub)
.showImageOnFail(R.drawable.artist_stub).cacheInMemory(true)
.cacheOnDisk(true).considerExifParams(true)
.bitmapConfig(Bitmap.Config.RGB_565).build();
}
public int getCount() {
return data.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
final ViewHolder holder;
// reuse views
if (rowView == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
rowView = inflater.inflate(R.layout.fragment_artist_list_item,
parent, false);
// configure view holder
holder = new ViewHolder(
(TextView) rowView.findViewById(R.id.tv_name),
(TextView) rowView.findViewById(R.id.tv_view_count),
(TextView) rowView.findViewById(R.id.tv_like_count),
(ImageView) rowView.findViewById(R.id.im_photo), position,
(ProgressBar) rowView.findViewById(R.id.progressbar1),
(LinearLayout) rowView.findViewById(R.id.ll_favorite_box),
(ImageView) rowView
.findViewById(R.id.im_favorite_indicator));
Typeface fontTitle = Typeface.createFromAsset(inflater.getContext()
.getAssets(), "fonts/ubuntu_r.ttf");
holder.title.setTypeface(fontTitle);
Typeface fontArtist = Typeface.createFromAsset(inflater
.getContext().getAssets(), "fonts/ubuntu_l.ttf");
holder.title.setShadowLayer(2f, -1, 1, Color.LTGRAY);
holder.viewCount.setTypeface(fontArtist);
holder.likeCount.setTypeface(fontArtist);
holder.likeCount.setShadowLayer(2f, -1, 1, Color.LTGRAY);
holder.viewCount.setShadowLayer(2f, -1, 1, Color.LTGRAY);
rowView.setTag(holder);
} else
holder = (ViewHolder) rowView.getTag();
if(!holder.sTitle.equals(data.get(position).getName())){
holder.sTitle = data.get(position).getName();
holder.title.setText(holder.sTitle);
}
holder.title.setText(data.get(position).getName());
holder.viewCount.setText("" + data.get(position).getViewCount());
holder.likeCount.setText("" + data.get(position).getFavoriteCount());
String value = data.get(position).getImageUrl();
ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.displayImage(value, holder.photo, options,
new MySimpleImageLoaderListener(holder, value));
boolean fav = data.get(position).isFavorite();
if (fav != holder.favorite) {
if (fav) {
holder.llFavBox.setBackgroundColor(context.getResources()
.getColor(R.color.blue_text_chart_position));
holder.favIndicator
.setImageResource(R.drawable.star_unselected_icon);
holder.likeCount.setTextColor(context.getResources().getColor(
R.color.white_text_60));
} else {
holder.llFavBox.setBackgroundColor(context.getResources()
.getColor(R.color.white_with_blue));
holder.favIndicator
.setImageResource(R.drawable.star_selected_icon);
holder.likeCount.setTextColor(context.getResources().getColor(
R.color.black_text_60));
}
holder.favorite = fav;
}
return rowView;
}
public class MySimpleImageLoaderListener extends SimpleImageLoadingListener {
private final ViewHolder holder;
private final String value;
public MySimpleImageLoaderListener(ViewHolder holder, String value) {
this.holder = holder;
this.value = value;
}
@Override
public void onLoadingStarted(String imageUri, View view) {
holder.progressBar.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingFailed(String imageUri, View view,
FailReason failReason) {
holder.progressBar.setVisibility(View.GONE);
}
@Override
public void onLoadingComplete(String imageUri, View view,
Bitmap loadedImage) {
holder.progressBar.setVisibility(View.GONE);
}
}
private static class ViewHolder {
final TextView title;
final TextView viewCount;
final TextView likeCount;
final ImageView photo;
final ProgressBar progressBar;
final int position;
final LinearLayout llFavBox;
final ImageView favIndicator;
boolean favorite = false;
String sTitle= "";
private ViewHolder(TextView title, TextView viewCount,
TextView likeCount, ImageView photo, int position,
ProgressBar progressBar, LinearLayout llFavBox,
ImageView favIndicator) {
this.title = title;
this.viewCount = viewCount;
this.likeCount = likeCount;
this.photo = photo;
this.position = position;
this.progressBar = progressBar;
this.llFavBox = llFavBox;
this.favIndicator = favIndicator;
}
}
可以做些什么来改进？
答案 0 :(得分：0)
我将大多数对象初始化从getView转移到适配器构造函数或外部适配器
答案 1 :(得分：0)
设置文本不应该有任何问题，因此为了更清晰的代码，我放弃等于（）检查。
您的代码中实际可能耗费时间的内容：