我遇到的问题是我从JSON响应中接收数据，数据中也有很多图像。有大量数据超过100.因此当我尝试在LazyAdapter中加载它或尝试将方法作为LazyAdapter的NotifydatasetChanged调用时，它会返回OutOfmemory异常。请提出任何解决方案。
代码：
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");
tv_CategoryChildHeader.setText(from);
setHeaderImage(tv_CategoryChildHeader.getText().toString());
if(coll.getDisplayNames().size()!=0)
{
adapter = new CategoryListLazyAdapter(
ResearchList.this);
lvCategory.setAdapter(adapter);
Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);
}
else
{
/*lvCategory.invalidate();
lvCategory.setAdapter(null);*/
AlertDialog.Builder builder = new Builder(ResearchList.this);
builder.setTitle("Attention!");
builder.setMessage("No Data Available for the Particular Search.");
builder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
builder.create().show();
}
/*Utility util = new Utility();
util.setListViewHeightBasedOnChildren(lvCategory);*/
dialog.dismiss();
}
};
final Thread checkUpdate = new Thread() {
public void run() {
try {
String sortEncode = URLEncoder.encode("mpg");
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();
LIST_SIZE = coll.getDisplayNames().size();
for (int i = 0; i <= BATCH_SIZE; i++) {
// countriesSub.add(COUNTRIES[i]);
countriesSubCat.add(coll.getDisplayNames().get(i));
imagesSubCat.add(coll.getImages().get(i));
YearSubCat1.add(coll.getYears().get(i));
YearSubCat2.add(coll.getYears().get(i + 1));
mpgSubCat1.add(coll.getMpg().get(i));
mpgSubCat2.add(coll.getMpg().get(i + 1));
priceSubCat1.add(coll.getPrice().get(i));
priceSubCat2.add(coll.getPrice().get(i + 1));
ratingSubCat1.add(coll.getRating().get(i));
ratingSubCat2.add(coll.getRating().get(i + 1));
}
setLastOffset(BATCH_SIZE);
handler.sendEmptyMessage(0);
}
};
checkUpdate.start();
GetJSonString方法（错误位置）：
public String getJsonSring(String api_url) throws URISyntaxException,
ClientProtocolException, IOException {
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
URL url = new URL(api_url);
URI uri = new URI(url.getProtocol(), url.getHost(), url.getPath(),
url.getQuery(), null);
request.setURI(uri);
HttpResponse response = client.execute(request);
InputStream ips = response.getEntity().getContent();
BufferedReader buf = new BufferedReader(new InputStreamReader(ips, "UTF-8"));
StringBuilder sb = new StringBuilder();
String s;
while (true) {
s = buf.readLine();
if (s == null || s.length() == 0)
break;
sb.append(s);
}
buf.close();
ips.close();
return sb.toString();
}
finally {
// any cleanup code...
}
}
答案 0 :(得分：0)
问题是您正在一次解析整个JSON提要，这太大而无法保存在内存中。使用JSON 流解析器，例如Jackson（也非常快），它允许您在从服务器提取订阅源时解析JSON对象。
在解析图像时，将它们转储到磁盘以释放内存并按照您的需要再次加载它们。