android - Android：内存不足错误StringBuilder

Question

在我的应用程序中，我以 JSON 的形式从服务器获取数据。数据约为 1.5 MB。该应用程序可以运行，但有时它会在从服务器获取数据时崩溃，并给出 OutOfMemoryError。

这是我的方法：

private String sendPostRequest(String url, List<NameValuePair> params)
        throws Exception {
    String ret = null;

    BufferedReader bufferedReader = null;
    HttpClient httpClient = new DefaultHttpClient();
    HttpPost request = new HttpPost(url);

    try {
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params);
        request.setEntity(entity);

        HttpResponse response = httpClient.execute(request);

        bufferedReader = new BufferedReader(new InputStreamReader(response
                .getEntity().getContent()));
        StringBuilder stringBuilder = new StringBuilder("");
        StringBuilder stringBuilder2;
        String line = "";
        //String LineSeparator = System.getProperty("line.separator");
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
        }
        bufferedReader.close();

        ret = stringBuilder.toString();
        stringBuilder = null;

    } catch (ClientProtocolException e) {
        e.printStackTrace();
        // TODO: report an error
    } catch (IOException e) {
        e.printStackTrace();
        // TODO: report an error
    } finally {
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                e.printStackTrace();
                // TODO Auto-generated catch block
            }
        }
    }
    return ret;
}

我尝试在使用后将 StringBuilder 设置为 null 但没有帮助。我在下面发布 logcat 跟踪：

10-23 03:39:25.271: E/dalvikvm-heap(1011): Out of memory on a 4116282-byte allocation.
10-23 03:39:25.271: I/dalvikvm(1011): "AsyncTask #1" prio=5 tid=11 RUNNABLE
10-23 03:39:25.271: I/dalvikvm(1011):   | group="main" sCount=0 dsCount=0 obj=0x417c5e88 self=0x2a1d1db8
10-23 03:39:25.271: I/dalvikvm(1011):   | sysTid=1025 nice=10 sched=0/0 cgrp=apps/bg_non_interactive handle=706552328
10-23 03:39:25.271: I/dalvikvm(1011):   | state=R schedstat=( 3053328788 23773807212 6541 ) utm=241 stm=64 core=0
10-23 03:39:25.271: I/dalvikvm(1011):   at java.lang.String.<init>(String.java:~422)
10-23 03:39:25.271: I/dalvikvm(1011):   at java.lang.AbstractStringBuilder.toString(AbstractStringBuilder.java:642)
10-23 03:39:25.282: I/dalvikvm(1011):   at java.lang.StringBuilder.toString(StringBuilder.java:663)
10-23 03:39:25.282: I/dalvikvm(1011):   at com.dzo.redacted.driverapp.datalayer.ServerConnect.sendPostRequest(ServerConnect.java:128)
10-23 03:39:25.282: I/dalvikvm(1011):   at com.dzo.redacted.driverapp.datalayer.ServerConnect.Sync(ServerConnect.java:61)
10-23 03:39:25.282: I/dalvikvm(1011):   at com.dzo.redacted.driverapp.datalayer.DBSync.Login(DBSync.java:59)
10-23 03:39:25.282: I/dalvikvm(1011):   at com.dzo.redacted.driverapp.asynctask.SyncDBTask.doInBackground(SyncDBTask.java:52)
10-23 03:39:25.282: I/dalvikvm(1011):   at com.dzo.redacted.driverapp.asynctask.SyncDBTask.doInBackground(SyncDBTask.java:1)
10-23 03:39:25.282: I/dalvikvm(1011):   at android.os.AsyncTask$2.call(AsyncTask.java:287)
10-23 03:39:25.282: I/dalvikvm(1011):   at java.util.concurrent.FutureTask.run(FutureTask.java:234)
10-23 03:39:25.282: I/dalvikvm(1011):   at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
10-23 03:39:25.282: I/dalvikvm(1011):   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
10-23 03:39:25.282: I/dalvikvm(1011):   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
10-23 03:39:25.282: I/dalvikvm(1011):   at java.lang.Thread.run(Thread.java:841)
10-23 03:39:25.282: W/dalvikvm(1011): threadid=11: thread exiting with uncaught exception (group=0x41465700)
10-23 03:39:25.292: I/Choreographer(1011): Skipped 30 frames!  The application may be doing too much work on its main thread.
10-23 03:39:25.491: E/AndroidRuntime(1011): FATAL EXCEPTION: AsyncTask #1
10-23 03:39:25.491: E/AndroidRuntime(1011): java.lang.RuntimeException: An error occured while executing doInBackground()
10-23 03:39:25.491: E/AndroidRuntime(1011):     at android.os.AsyncTask$3.done(AsyncTask.java:299) 
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.lang.Thread.run(Thread.java:841)
10-23 03:39:25.491: E/AndroidRuntime(1011): Caused by: java.lang.OutOfMemoryError
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.lang.String.<init>(String.java:422)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.lang.AbstractStringBuilder.toString(AbstractStringBuilder.java:642)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.lang.StringBuilder.toString(StringBuilder.java:663)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at com.dzo.redacted.driverapp.datalayer.ServerConnect.sendPostRequest(ServerConnect.java:128)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at com.dzo.redacted.driverapp.datalayer.ServerConnect.Sync(ServerConnect.java:61)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at com.dzo.redacted.driverapp.datalayer.DBSync.Login(DBSync.java:59)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at com.dzo.redacted.driverapp.asynctask.SyncDBTask.doInBackground(SyncDBTask.java:52)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at com.dzo.redacted.driverapp.asynctask.SyncDBTask.doInBackground(SyncDBTask.java:1)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
10-23 03:39:25.491: E/AndroidRuntime(1011):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
10-23 03:39:25.491: E/AndroidRuntime(1011):     ... 4 more
10-23 03:39:28.091: E/WindowManager(1011): Activity com.dzo.redacted.driverapp.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4178fcb0 V.E..... R.....ID 0,0-479,96} that was originally added here
10-23 03:39:28.091: E/WindowManager(1011): android.view.WindowLeaked: Activity com.dzo.redacted.driverapp.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{4178fcb0 V.E..... R.....ID 0,0-479,96} that was originally added here
10-23 03:39:28.091: E/WindowManager(1011):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:345)
10-23 03:39:28.091: E/WindowManager(1011):  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:239)
10-23 03:39:28.091: E/WindowManager(1011):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
10-23 03:39:28.091: E/WindowManager(1011):  at android.app.Dialog.show(Dialog.java:281)
10-23 03:39:28.091: E/WindowManager(1011):  at com.dzo.redacted.driverapp.asynctask.SyncDBTask.onPreExecute(SyncDBTask.java:43)
10-23 03:39:28.091: E/WindowManager(1011):  at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
10-23 03:39:28.091: E/WindowManager(1011):  at android.os.AsyncTask.execute(AsyncTask.java:534)
10-23 03:39:28.091: E/WindowManager(1011):  at com.dzo.redacted.driverapp.asynctask.LoginAsyncTask.onPostExecute(LoginAsyncTask.java:87)
10-23 03:39:28.091: E/WindowManager(1011):  at com.dzo.redacted.driverapp.asynctask.LoginAsyncTask.onPostExecute(LoginAsyncTask.java:1)
10-23 03:39:28.091: E/WindowManager(1011):  at android.os.AsyncTask.finish(AsyncTask.java:631)
10-23 03:39:28.091: E/WindowManager(1011):  at android.os.AsyncTask.access$600(AsyncTask.java:177)
10-23 03:39:28.091: E/WindowManager(1011):  at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
10-23 03:39:28.091: E/WindowManager(1011):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-23 03:39:28.091: E/WindowManager(1011):  at android.os.Looper.loop(Looper.java:137)
10-23 03:39:28.091: E/WindowManager(1011):  at android.app.ActivityThread.main(ActivityThread.java:5103)
10-23 03:39:28.091: E/WindowManager(1011):  at java.lang.reflect.Method.invokeNative(Native Method)
10-23 03:39:28.091: E/WindowManager(1011):  at java.lang.reflect.Method.invoke(Method.java:525)
10-23 03:39:28.091: E/WindowManager(1011):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-23 03:39:28.091: E/WindowManager(1011):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-23 03:39:28.091: E/WindowManager(1011):  at dalvik.system.NativeStart.main(Native Method)
10-23 03:44:25.761: I/Process(1011): Sending signal. PID: 1011 SIG: 9

更新 1

我再次尝试使用这种方法，在我的情况下它也给了 toString() 错误，它给了 toString() 错误。当我尝试使用Amit's answer时也发生了同样的情况。toString() 有什么用吗？

更新 2

从 while 循环中删除了新字符串构建器对象的创建，现在我没有使用行分隔符。但是，并没有太大的不同。该应用程序首次运行。但是，如果我尝试连续运行 2-3 次，同样的问题会再次出现。

score 9 · Accepted Answer

如果您没有足够的内存来存储您的字符串，您可以：释放一些内存，减少内存消耗并且不要将字符串存储在内存中。

在您的情况下，您需要：

存储响应的内存（大约 1.5+mb）
字符串生成器的内存（大约 1.5+mb）
结果字符串的内存（大约 1.5+mb 连续内存，非常糟糕）
BufferedReader/InputStreamReader...等。（几公斤）

选项：

将响应转换为没有字符串生成器的字符串。它将节省 1+mb。
将响应读取为流并将其转换为没有字符串生成器的字符串。请求/响应实体流。它将节省大约 3mb
不要将响应转换为字符串。将其作为流读取并保存到文件或数据库，或将流提供给流式 JSON 解析器。
在发送您的帖子请求之前尽可能多地释放内存，并开始祈祷一切都会好起来。

score 1 · Accepted Answer

1

只需将其添加到<application />清单中的标记中：

android:largeHeap="true"

于 2015-05-20T11:39:39.947 回答

score 0 · Accepted Answer

像这样试试

private String sendPostRequest(String url, List<NameValuePair> params)
        throws Exception {
    String ret = null;
    BufferedReader bufferedReader = null;
    HttpClient httpClient = new DefaultHttpClient();
    HttpPost request = new HttpPost(url);

    try {
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params);
        request.setEntity(entity);

        HttpResponse response = httpClient.execute(request);
        bufferedReader = new BufferedReader(new InputStreamReader(response
                .getEntity().getContent()));
        String line = "";
        while ((line = bufferedReader.readLine()) != null) {
           ret =ret +line;
        }
        bufferedReader.close();

    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (bufferedReader != null) {
            try {
                bufferedReader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return ret;
}

android - Android：内存不足错误StringBuilder

3 回答 3

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