我在我的应用程序中自定义了 EndlessAdapter 的代码，但我犯了一个错误，因为这个 Endless Adapter 总是在后台下载数据，而不是在用户向下滚动列表后下载相同的数据，我无法在我们的项目中找到相同的错误。由于这个错误，我的应用程序有时会返回 OutOfMemoryException，这是不可接受的。
请向我建议任何有关相同的解决方案。
代码： * MyEndlessAdapter： *
class DemoAdapterCat extends EndlessAdapter {
private RotateAnimation rotate=null;
ArrayList<String> tempListNamesCat = new ArrayList<String>();
ArrayList<String> tempListImagesCat = new ArrayList<String>();
ArrayList<String> tempListYearCat1 = new ArrayList<String>();
ArrayList<String> tempListYearCat2 = new ArrayList<String>();
ArrayList<String> tempListmpgCat1 = new ArrayList<String>();
ArrayList<String> tempListmpgCat2 = new ArrayList<String>();
ArrayList<String> tempListpriceCat1 = new ArrayList<String>();
ArrayList<String> tempListpriceCat2 = new ArrayList<String>();
ArrayList<String> tempListRatingCat1 = new ArrayList<String>();
ArrayList<String> tempListRatingCat2 = new ArrayList<String>();
DemoAdapterCat() {
super(new CategoryListLazyAdapter(ResearchList.this, countriesSubCat, imagesSubCat, YearSubCat1,YearSubCat2, mpgSubCat1,mpgSubCat2, priceSubCat1,priceSubCat2, ratingSubCat1, ratingSubCat2));
Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);
rotate=new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF,
0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
rotate.setDuration(600);
rotate.setRepeatMode(Animation.RESTART);
rotate.setRepeatCount(Animation.INFINITE);
}
/*
@Override
public int getCount()
{
//return brandList.getDisplayNames().size();
return countriesSubCat.size();
}*/
@Override
protected View getPendingView(ViewGroup parent) {
row=getLayoutInflater().inflate(R.layout.categorylist, null);
child=row.findViewById(R.id.tv_CategoryItem_Name);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_MPG1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_MPG2);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Price1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Price2);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Rating1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Rating2);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Year1);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.tv_CategoryItem_Year2);
child.setVisibility(View.GONE);
/*child = row.findViewById(R.id.img_CategoryItem);
child.setVisibility(View.GONE);
child = row.findViewById(R.id.img_CategoryItem_Arrow);
child.setVisibility(View.GONE);*/
/*child = row.findViewById(R.id.linear_main_MPG);
child.setVisibility(View.GONE);*/
child=row.findViewById(R.id.throbber);
child.setVisibility(View.VISIBLE);
child.startAnimation(rotate);
return(row);
}
@Override
protected boolean cacheInBackground() {
SystemClock.sleep(10000);
tempListNamesCat.clear();
tempListImagesCat.clear();
tempListmpgCat1.clear();
tempListmpgCat2.clear();
tempListpriceCat1.clear();
tempListpriceCat2.clear();
tempListYearCat1.clear();
tempListYearCat2.clear();
tempListRatingCat1.clear();
tempListRatingCat2.clear();
int lastOffset = getLastOffset();
if(lastOffset < LIST_SIZE){
int limit = lastOffset + BATCH_SIZE;
for(int i=(lastOffset+1); (i<=limit && i<LIST_SIZE); i++){
tempListNamesCat.add(coll.getDisplayNames().get(i));
tempListImagesCat.add(coll.getImages().get(i));
tempListmpgCat1.add(coll.getMpg().get(i));
tempListmpgCat2.add(coll.getMpg().get(i+1));
tempListpriceCat1.add(coll.getPrice().get(i));
tempListpriceCat2.add(coll.getPrice().get(i+1));
tempListRatingCat1.add(coll.getRating().get(i));
tempListRatingCat2.add(coll.getRating().get(i+1));
tempListYearCat1.add(coll.getYears().get(i));
tempListYearCat2.add(coll.getYears().get(i+1));
}
setLastOffset(limit);
if(limit<LIST_SIZE){
//return true;
return(getWrappedAdapter().getCount()<coll.getDisplayNames().size());
} else {
return false;
}
} else {
return false;
}
}
@Override
protected void appendCachedData() {
@SuppressWarnings("unchecked")
//Activity activity = this;
//ArrayAdapter<String> arrAdapterNew = (ArrayAdapter<String>)getWrappedAdapter();
CategoryListLazyAdapter arrAdapterNewCategory = (CategoryListLazyAdapter)getWrappedAdapter();
//int listLen = tempList.size();
// int listLen = tempListNames.size();
countriesSubCat.addAll(tempListNamesCat);
imagesSubCat.addAll(tempListImagesCat);
mpgSubCat1.addAll(tempListmpgCat1);
mpgSubCat2.addAll(tempListmpgCat2);
priceSubCat1.addAll(tempListpriceCat1);
priceSubCat2.addAll(tempListpriceCat2);
ratingSubCat1.addAll(tempListRatingCat1);
ratingSubCat2.addAll(tempListRatingCat2);
YearSubCat1.addAll(tempListYearCat1);
YearSubCat2.addAll(tempListYearCat2);
arrAdapterNewCategory.notifyDataSetChanged();
Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);
/* for(int i=0; i<listLen; i++){
// arrAdapterNew.add(tempList.get(i));
}*/
}
}
将 Demoadapter 设置为列表：
public void setValuesInCategoryChildSortByAZ(String url,final String filter, final String from, final String to)
{
if(isOnline())
{
final ProgressDialog dialog = ProgressDialog.show(
ResearchList.this, "Research List ",
"Please wait... ", true);
final Handler handler = new Handler() {
public void handleMessage(Message msg) {
// System.out.println("The id after Save:"+id.get(0).toString());
// catagory.addAll(keyword_vector1);
linear_Category_Child.setVisibility(View.GONE);
linear_Category_Child_Child.setVisibility(View.VISIBLE);
//tv_Child_Header.setText("Volvo");
/*adapter = new CategoryListLazyAdapter(
ResearchList.this);
lvCategory.setAdapter(adapter);*/
demoAdapterCat.notifyDataSetChanged();
Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);
dialog.dismiss();
}
};
final Thread checkUpdate = new Thread() {
public void run() {
try {
String sortEncode = URLEncoder.encode("alpha");
String filterEncode = URLEncoder.encode(filter);
String clientEncode = URLEncoder.encode("10030812");
String fromEncode = URLEncoder.encode(from);
String toEncode = URLEncoder.encode(to);
String catUrl = "/v1/vehicles/get-make-models.json?sort="+sortEncode+"&filter="+filterEncode+"&client-id="+clientEncode+"&from="+fromEncode;
genSig = new GetSignature(catUrl, "acura");
try {
signature = genSig.getUrlFromString();
} catch (InvalidKeyException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (NoSuchAlgorithmException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// jsonString =
// getJsonSring("http://api.highgearmedia.com/v1/vehicles/get-models.json?make=acura&client-id=10030812&signature=LWQbdAlJVxlXZ1VO2mfqAA==");
//String signatureEncode = URLEncoder.encode(signature);
String urlEncode = URLEncoder.encode(catUrl+"&signature="+signature);
jsonString = getJsonSring("http://apibeta.highgearmedia.com"+catUrl+"&signature="+signature);
System.out.println("The json category:===>"+jsonString);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
JsonParse json = new JsonParse(jsonString);
json.parseCat();
handler.sendEmptyMessage(0);
}
};
checkUpdate.start();
}else
{
AlertDialog.Builder builder = new Builder(ResearchList.this);
builder.setTitle("Attention!");
builder.setMessage("Network Connection unavailable.");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
builder.create().show();
}
}
提前致谢。