我正在使用以下代码从服务器获取xml文件，并且由于重型和大型xml文件，它崩溃并显示内存不足问题。

public class Connect {

static BufferedReader in=null;

String result=null;

Context context;

//Establish connection with web server

public String HTTPConnect(String uri1,List list,Context context)

{

this.context=context;

try {

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpPost httpPost = new HttpPost(uri1);

if(list!=null)

{

UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list);

httpPost.setEntity(formEntity);

}

HttpResponse httpResponse = httpClient.execute(httpPost);

in = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent()));

StringBuffer sb = new StringBuffer("");

String line = "";

String NL = System.getProperty("line.separator");

long heapSize = Runtime.getRuntime().totalMemory();

if(in!=null)

{

while ((line = in.readLine()) != null) {//crasheg here

sb.append(line + NL);

}

in.close();

}

result = sb.toString();

}

catch(UnsupportedEncodingException e)

{

String err = (e.getMessage()==null)?"Cant connect to server":e.getMessage();

ShowDialog();

}

catch (MalformedURLException e) {

String err = (e.getMessage()==null)?"Malformed Exception":e.getMessage();

ShowDialog();

}

catch(Exception ex)

{

String err = (ex.getMessage()==null)?"NetworkConnectionException":ex.getMessage();

ShowDialog();

}

finally {

if (in != null) {

try {

in.close();

} catch (Exception ex) {

String err = (ex.getMessage()==null)?"Excepion":ex.getMessage();

ex.printStackTrace();

}

}

}

return result;

}

我知道我正在使用String复制整个XML，并且由于文件繁重，因此崩溃了。它在小型XML文件中运行良好，但是大型xml文件的替代方法是什么。我正在使用SAX解析器来解析这个xml文件。

[编辑]

下面是logcat：

FATAL EXCEPTION: AsyncTask #4

java.lang.RuntimeException: An error occured while executing doInBackground()

at android.os.AsyncTask$3.done(AsyncTask.java:200)

at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)

at java.util.concurrent.FutureTask.setException(FutureTask.java:124)

at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)

at java.util.concurrent.FutureTask.run(FutureTask.java:137)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)

at java.lang.Thread.run(Thread.java:1096)

Caused by: java.lang.OutOfMemoryError

java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:97)

java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:136)

java.lang.StringBuilder.append(StringBuilder.java:272)

java.io.BufferedReader.readLine(BufferedReader.java:452)

com.kxs.appitize.Connect.HTTPConnect(Connect.java:56)

com.kxs.appitize.ListRestaurants$Asyn_rest.doInBackground(ListRestaurants.java:168)

com.kxs.appitize.ListRestaurants$Asyn_rest.doInBackground(ListRestaurants.java:1)

01-at android.os.AsyncTask$2.call(AsyncTask.java:185)

at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)

Activity com.kxs.appitize.TabsMainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f4fb28 that was originally added here

android.view.WindowLeaked: Activity com.kxs.appitize.TabsMainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f4fb28 that was originally added here

at android.view.ViewRoot.(ViewRoot.java:247)

at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)

at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)

at android.view.Window$LocalWindowManager.addView(Window.java:424)

at android.app.Dialog.show(Dialog.java:241)

at com.kxs.appitize.ListRestaurants$Asyn_rest.onPreExecute(ListRestaurants.java:156)

at android.os.AsyncTask.execute(AsyncTask.java:391)

at com.kxs.appitize.ListRestaurants.onCreate(ListRestaurants.java:133)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503)

at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)

at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)

at com.kxs.appitize.TabGroupActivity.startChildActivity(TabGroupActivity.java:72)

at com.kxs.appitize.ListCategories$1.onClick(ListCategories.java:109)

at android.view.View.performClick(View.java:2408)

at android.view.View$PerformClick.run(View.java:8816)

at android.os.Handler.handleCallback(Handler.java:587)

at android.os.Handler.dispatchMessage(Handler.java:92)

at android.os.Looper.loop(Looper.java:123)

at android.app.ActivityThread.main(ActivityThread.java:4627)

at java.lang.reflect.Method.invokeNative(Native Method)

java.lang.reflect.Method.invoke(Method.java:521)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

at dalvik.system.NativeStart.main(Native Method)