我按照developer.android.com中的说明进行网络通话（使用HttpURLConnection）。现在我得到一个内存不足的异常，应用程序正在崩溃。
以下是堆栈跟踪：
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.app, PID: 19869
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: java.lang.OutOfMemoryError: Failed to allocate a 4294967306 byte allocation with 4056144 free bytes and 370MB until OOM
at com.example.app.webservices.HttpConnectionClass.readIt(HttpConnectionClass.java:158)
at com.example.app.webservices.HttpConnectionClass.downloadUrl(HttpConnectionClass.java:123)
at com.example.app.webservices.HttpConnectionClass.access$100(HttpConnectionClass.java:28)
at com.example.app.webservices.HttpConnectionClass$DownloadWebpageTask.doInBackground(HttpConnectionClass.java:52)
at com.example.app.webservices.HttpConnectionClass$DownloadWebpageTask.doInBackground(HttpConnectionClass.java:46)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
我已经把它包括在我的清单中了：
android:largeHeap="true"
这是我的网络类：
public class HttpConnectionClass {
public static Activity context;
List json;
static boolean dialogIsShowing = true;
public String url;
List<NameValuePair> params = new ArrayList<NameValuePair>();
public void getPostResponse_WithAsyn(Activity context, String url, List json, String message) {
this.params = json;
this.url= url;
this.json = json;
Log.v("TAG","PARAMS::"+json.toString());
//add all the default parameters here
new DownloadWebpageTask().execute(url);
}
private class DownloadWebpageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
// params comes from the execute() call: params[0] is the url.
try {
return downloadUrl(urls[0]);
} catch (IOException e) {
e.printStackTrace();
return "Unable to retrieve web page. URL may be invalid.";
}
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
GetHttpPostResponse.myJsonResponse = result;
/*int maxLogSize = 1000;
for(int i = 0; i <= result.length() / maxLogSize; i++) {
int start = i * maxLogSize;
int end = (i+1) * maxLogSize;
end = end > result.length() ? result.length() : end;
Log.v("TAG_result", result.substring(start, end));
}
*/
Log.v("Connection class","Response::"+result);
}
}
private String downloadUrl(String myurl) throws IOException {
InputStream is = null;
// Only display the first 500 characters of the retrieved
// web page content.
int len =Integer.MAX_VALUE;
try {
URL url = new URL(myurl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
Log.v("TAG","CONNECTING URL::"+myurl);
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("key1", ""));
params.add(new BasicNameValuePair("key2", ""));
Log.v("TAG","PARAMETERS::"+params.toString());
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
writer.write(getQuery(params));
writer.flush();
writer.close();
os.close();
// Starts the query
conn.connect();
int response = conn.getResponseCode();
String res_data = conn.getResponseMessage();
Log.d("TAG", "The response is: " + res_data);
is = conn.getInputStream();
// Convert the InputStream into a string
String contentAsString = readIt(is, len);
return contentAsString;
// Makes sure that the InputStream is closed after the app is
// finished using it.
} finally {
if (is != null) {
is.close();
}
}
}
private String getQuery(List<NameValuePair> params) throws IOException,UnsupportedEncodingException {
StringBuilder result = new StringBuilder();
boolean first = true;
for (NameValuePair pair : params) {
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
}
return result.toString();
}
public String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException {
Reader reader = null;
reader = new InputStreamReader(stream, "UTF-8");
char[] buffer = new char[len];
reader.read(buffer);
return new String(buffer);
}
}
并且，我已经确定了＆＃34; len＆＃34;是问题并尝试对其进行硬编码，但似乎并不适用于所有场景。
{"ResponseCode":"-1000","ResponseDesc":"Invalid user type."}�
请帮帮我。
答案 0 :(得分：1)
试试这个readIt方法，
public String readIt(InputStream stream) throws IOException, UnsupportedEncodingException {
StringBuffer sb = new StringBuffer();
BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));
String line;
while ((line = br.readLine()) != null){
sb.append(line);
}
br.close();
return sb.toString();
}
答案 1 :(得分：0)
您正在尝试
int len =Integer.MAX_VALUE;
char[] buffer = new char[len];
答案 2 :(得分：0)
您正在分配长度为Integer.MAX_LENGTH的char数组，该数组将不适合可用内存。我认为你最好让readIt()看起来像这样：
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int l;
while ((l = stream.read(buffer)) != -1) {
baos.write(buffer, 0, l);
}
return baos.toString("UTF-8");