我正在構建一種 Pulse 型別的 UI。為此，我使用Galleryinside ListView。但是，我遇到了一個奇怪的問題，當我滾動瀏覽串列視圖時，我的應用程式中的記憶體分配逐漸從 9 MB 增加到 64 MB，直到它最終崩潰。
什么不起作用：
我懷疑這是否是因為我使用的位圖。因此，我在畫廊內沒有影像的情況下對其進行了測驗。我還使用了 Universal Image Loader庫。然而，一切都沒有改變。
我在 SO 中閱讀了類似的問題，禁用
scrollingCachelistView 可能會有所幫助。但是，仍然沒有效果。
什么有效：
ViewHolder使用,設計高效的配接器getTag()，setTag()解決了記憶體問題。但是，它帶來了一個奇怪的問題，listView 有時會顯示空行或重復行，從而在 UI 中顯示錯誤的資料。我該如何解決這個問題？有沒有更好的方法來解決這個問題？
ListViewAdapter.java
public class ListViewAdapter extends BaseAdapter {
String user_locale;
Context context;
LayoutInflater inflater;
AssetsAdapter assestsAdapter;
List<Category> categoryList;
List<BaseAssets> baseAssetList;
AssetsTable assetTable;
ViewHolder viewHolder;
public ListViewAdapter(Context context, List<Category> categoryList) {
this.context = context;
user_locale = Universal.getCurrentLanguage(context);
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.categoryList = categoryList;
assetTable = new AssetsTable(context);
viewHolder = new ViewHolder();
}
public int getCount() {
return categoryList.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
String catID = categoryList.get(position).catID;
if (convertView == null)
{
convertView = inflater.inflate(R.layout.category_list_item, parent, false);
viewHolder.categoryTitle = (TextView) convertView.findViewById(R.id.category_title);
viewHolder.gallery = (Gallery) convertView.findViewById(R.id.gallery);
convertView.setTag(viewHolder);
} else
viewHolder = (ViewHolder) convertView.getTag();
assetTable = new AssetsTable(context);
int count = assetTable.getCountOfParticularCategory(catID);
initializeGallery(catID);
String text = categoryList.get(position).catName " (" count ") ";
viewHolder.categoryTitle.setText(text);
return convertView;
}
public void initializeGallery(String catID) {
assetTable = new AssetsTable(context);
baseAssetList = assetTable.getAllBaseAssets(catID);
assestsAdapter = new AssetsAdapter(context, baseAssetList);
adjustGalleryHeight();
viewHolder.gallery.setAdapter(assestsAdapter);
}
public void adjustGalleryHeight() {
boolean isPortrait = false;
final String TAG_PORTRAIT = "portrait";
for (BaseAssets b : baseAssetList)
{
if (b.thumbOrientation.equals(TAG_PORTRAIT))
isPortrait = true;
}
final float scale = context.getResources().getDisplayMetrics().density;
if (isPortrait)
{
RelativeLayout.LayoutParams params1 = (RelativeLayout.LayoutParams) viewHolder.gallery.getLayoutParams();
params1.height = (int) (350 * scale);
viewHolder.gallery.setLayoutParams(params1);
} else
{
RelativeLayout.LayoutParams params1 = (RelativeLayout.LayoutParams) viewHolder.gallery.getLayoutParams();
params1.height = (int) (280 * scale);
viewHolder.gallery.setLayoutParams(params1);
}
}
class ViewHolder {
TextView categoryTitle;
Gallery gallery;
}
}
GalleryAdapter.java：
public class GalleryAdapter extends BaseAdapter {
final String TAG_PORTRAIT = "portrait";
LayoutInflater inflater;
ImageLoader imageLoader;
DisplayImageOptions options;
Context context;
List<BaseAssets> baseAssetsList;
Gallery.LayoutParams params;
public GalleryAdapter(Context context, List<BaseAssets> baseAssetsList) {
imageLoader = ImageLoader.getInstance();
options = new DisplayImageOptions.Builder().cacheOnDisc().imageScaleType(ImageScaleType.EXACTLY).bitmapConfig(Bitmap.Config.RGB_565).cacheInMemory().showStubImage(
R.drawable.no_preview).build();
this.context = context;
this.baseAssetsList = baseAssetsList;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return baseAssetsList.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null)
{
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.gallery_list_item, parent, false);
viewHolder.galleryWrapper = (RelativeLayout) convertView.findViewById(R.id.gallery_wrapper);
viewHolder.downloadThumbnail = (ImageView) convertView.findViewById(R.id.thumbnailDownloadStatus);
viewHolder.assetImage = (ImageView) convertView.findViewById(R.id.thumbnail_image);
viewHolder.assetName = (TextView) convertView.findViewById(R.id.thumbnail_name);
convertView.setTag(viewHolder);
} else
viewHolder = (ViewHolder) convertView.getTag();
final float scale = context.getResources().getDisplayMetrics().density;
if (baseAssetsList.get(position).thumbOrientation.equals(TAG_PORTRAIT))
{
params = new Gallery.LayoutParams((int) (166 * scale), (int) (245 * scale));
viewHolder.galleryWrapper.setLayoutParams(params);
} else
{
params = new Gallery.LayoutParams((int) (238 * scale), (int) (191 * scale));
viewHolder.galleryWrapper.setLayoutParams(params);
}
viewHolder.assetName.setText(baseAssetsList.get(position).contentTitle);
String raw_url = baseAssetsList.get(position).thumbnail;
String correctUrl = correctUrl(raw_url);
imageLoader.displayImage(correctUrl, viewHolder.assetImage, options);
convertView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(context, DownloadActivity.class);
intent.putExtra(Universal.ASSET_TYPE, baseAssetsList.get(position).contentType);
intent.putExtra(Universal.ASSET_TITLE, baseAssetsList.get(position).contentTitle);
intent.putExtra(Universal.ASSET_URL, baseAssetsList.get(position).path);
intent.putExtra(Universal.ASSET_LARGE_THUMBNAIL, baseAssetsList.get(position).thumbnail);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
return convertView;
}
public String correctUrl(String raw_url) {
String corrected_url = raw_url;
if (!raw_url.contains("http:/"))
corrected_url = ("http:/" raw_url);
return corrected_url;
}
class ViewHolder {
RelativeLayout galleryWrapper;
ImageView assetImage;
ImageView downloadThumbnail;
TextView assetName;
}
}
uj5u.com熱心網友回復：
在你的ListViewAdapter你沒有打電話
viewHolder = new ViewHolder();
在什么getView()時候。convertViewnull
核實！這可能是問題所在。
uj5u.com熱心網友回復：
嘗試更改“viewHolder = new ViewHolder();” 如果 convertview 為空，則在 Adapter 的 getview 內；
喜歡 ：
public View getView(final int position, View convertView, ViewGroup parent) {
String catID = categoryList.get(position).catID;
if (convertView == null)
{
viewHolder = new ViewHolder(); //Add this line. Otherwise u are sharing the same instance for other views.
convertView = inflater.inflate(R.layout.category_list_item, parent, false);
viewHolder.categoryTitle = (TextView) convertView.findViewById(R.id.category_title);
viewHolder.gallery = (Gallery) convertView.findViewById(R.id.gallery);
convertView.setTag(viewHolder);
} else
viewHolder = (ViewHolder) convertView.getTag();
assetTable = new AssetsTable(context);
int count = assetTable.getCountOfParticularCategory(catID);
initializeGallery(catID);
String text = categoryList.get(position).catName " (" count ") ";
viewHolder.categoryTitle.setText(text);
return convertView;
}
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