OutOfMemoryError Android

Question

我的应用程序在5天前运行良好！今天，我尝试运行它，而且它绝对是疯了！

我得到在logcat的这条消息终于抛出的OutOfMemoryError之前

01-06 04:14:17.088: D/dalvikvm(454): GC_FOR_MALLOC freed 5702 objects/326856 bytes in 76ms 
01-06 04:14:17.228: D/dalvikvm(454): GC_FOR_MALLOC freed 680 objects/157944 bytes in 57ms 
01-06 04:14:17.228: I/dalvikvm-heap(454): Grow heap (frag case) to 2.860MB for 121834-byte allocation 
01-06 04:14:17.288: D/dalvikvm(454): GC_FOR_MALLOC freed 1 objects/81232 bytes in 60ms 
01-06 04:14:17.378: D/dalvikvm(454): GC_FOR_MALLOC freed 5 objects/192 bytes in 65ms 
01-06 04:14:17.388: I/dalvikvm-heap(454): Grow heap (frag case) to 2.957MB for 182746-byte allocation 
....and so on... 

，最后这个错误出现：

01-06 04:24:49.218: E/AndroidRuntime(511): java.lang.OutOfMemoryError 
01-06 04:24:49.218: E/AndroidRuntime(511): at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:97) 
01-06 04:24:49.218: E/AndroidRuntime(511): at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:136) 
01-06 04:24:49.218: E/AndroidRuntime(511): at java.lang.StringBuilder.append(StringBuilder.java:272) 
01-06 04:24:49.218: E/AndroidRuntime(511): at java.io.BufferedReader.readLine(BufferedReader.java:452) 
01-06 04:24:49.218: E/AndroidRuntime(511): at appsbidder.clientstuff.Utils.openURL(Utils.java:285) 
01-06 04:24:49.218: E/AndroidRuntime(511): at appsbidder.clientstuff.Utils.getFeatured(Utils.java:224) 
01-06 04:24:49.218: E/AndroidRuntime(511): at appsbidder.FeaturedAppsActivity$GridViewAdapter.<init>(FeaturedAppsActivity.java:45) 
01-06 04:24:49.218: E/AndroidRuntime(511): at appsbidder.FeaturedAppsActivity.onCreate(FeaturedAppsActivity.java:28) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.os.Looper.loop(Looper.java:123) 
01-06 04:24:49.218: E/AndroidRuntime(511): at android.app.ActivityThread.main(ActivityThread.java:4627) 
01-06 04:24:49.218: E/AndroidRuntime(511): at java.lang.reflect.Method.invokeNative(Native Method) 
01-06 04:24:49.218: E/AndroidRuntime(511): at java.lang.reflect.Method.invoke(Method.java:521) 
01-06 04:24:49.218: E/AndroidRuntime(511): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
01-06 04:24:49.218: E/AndroidRuntime(511): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
01-06 04:24:49.218: E/AndroidRuntime(511): at dalvik.system.NativeStart.main(Native Method) 

我想我把范围缩小到这个块代码，但我不知道为什么它不起作用！它之前一直工作正常。我能想到的唯一问题是，现在它需要比以前更多的数据，所以在某处发生溢出，但是在哪里？

public JSONArray openURL(String urlParams, String url) 
    { 


    HttpsURLConnection connection = null; 
    try { 
     System.setProperty("http.keepAlive", "false"); 
     //Create connection 
     connection = (HttpsURLConnection)new URL(url).openConnection(); 
     connection.setRequestMethod("POST"); 


     connection.setRequestProperty("Content-Type", 
     "application/x-www-form-urlencoded"); 

     connection.setRequestProperty("Content-Length", "" + 
      Integer.toString(urlParams.getBytes().length)); 
     connection.setRequestProperty("Content-Language", "en-US"); 


     connection.setUseCaches(false); 
     connection.setDoInput(true); 
     connection.setDoOutput(true); 

     //Send request 
     DataOutputStream wr = new DataOutputStream (
        connection.getOutputStream()); 
     wr.writeBytes (urlParams); 
     wr.flush(); 
     wr.close(); 

     //Get Response  
     InputStream is = connection.getInputStream(); 
     BufferedReader rd = new BufferedReader(new InputStreamReader(is)); 
     String line; 
     JSONArray ja = new JSONArray(); 
     while((line = rd.readLine()) != null) { 
      ja = new JSONArray(line); 
     } 
     rd.close(); 
     return ja; 

    } catch (Exception e) { 

     e.printStackTrace(); 
     return null; 

    } finally { 

     if(connection != null) { 
     connection.disconnect(); 
     } 

    } 

    } 

Answer 1

大概位置：

while((line = rd.readLine()) != null) { 

如果响应包含在单线大JSON，那么你可以在这条线的OutOfMemoryError。您可以通过检查手动进行的响应来验证。

Answer 2

我觉得这行代码是错误的：

JSONArray ja = new JSONArray(); 
     while((line = rd.readLine()) != null) { 
      ja = new JSONArray(line); // in every step of loop, you create an object, that is wrong for memory 
     } 

改用：

JSONArray ja = new JSONArray(); 
     while((line = rd.readLine()) != null) { 
      ja.add(line); 
     } 

希望这有助于。

Answer 3

我所看到的，你应该看看这个：

 while((line = rd.readLine()) != null) { 
      ja = new JSONArray(line); 
     } 

由于误差trown在ReadLine方法调用。

01-06 04:24:49.218: E/AndroidRuntime(511): at java.lang.StringBuilder.append(StringBuilder.java:272) 
01-06 04:24:49.218: E/A ndroidRuntime(511): at java.io.BufferedReader.readLine(BufferedReader.java:452) 

你应该试试这个：

char[] buffer = new char[8064]; 
BufferedReader rd = new BufferedReader(new InputStreamReader(is), buffer.length); 

和使用阅读，而不是的readLine

rd.read(buffer, 0, buffer.length) 

上有许多这样的例子。

编辑：

从我的旧项目：

readResponse(InputStream inputStream) { 

ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
byte[] buffer = new byte[8064]; 

while(true) { 
int rd = inputStream.read(buffer) 
if(rd == -1)break; 
stream.write(buffer, 0 , rd); 
} 

stream.flush(); 
buffer = stream.toByteArray(); 
String response = new String(buffer); 
inputStream.close(); 

return response; 
}