java - 服务占用太多内存

Question

我有一个服务，可以从 URL 中提取 html 代码，将其转换为仅文本(使用 Jsoup)，然后检查字符串上的某些内容，如果某些条件成立，它会启动通知并将某些内容写入文件。据我所知，这种服务不会占用太多内存，而在 Watchdog 中，它大约需要 65 MB，这太多了。它比任何其他进程都需要更多的时间(甚至比 tw 启动器和 Android 系统还要多)。我希望你告诉我我做错了什么。

这是我的服务类别:

public class NotifyService extends Service 
{
    private int number=0;
    private Timer timer=new Timer();
    private long INTERVAL=1*1000*60*60;//1 hour

    public static String Oldhtml;
    public static String Newhtml;
    public static String currHtml;


    // hooks main activity here    


    /* 
     * not using ipc...but if we use in future
     */
    public IBinder onBind(Intent intent) {
      return null;
    }

    @Override 
    public void onCreate() 
    {
      super.onCreate();     

      _startService();
      Log.w("myApp", "START");
    }

    @Override 
    public void onDestroy() 
    {
      super.onDestroy();

      _shutdownService();
      Log.w("myApp", "STOPPED");

    }


    /*
     * starting the service
     */
    private void _startService()
    {      
      timer.scheduleAtFixedRate(new TimerTask() {

        public void run() {
            try {
                doServiceWork();
            } catch (ClientProtocolException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            try {
                Thread.sleep(INTERVAL);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    },0,INTERVAL);
      ;
    }




    /*
     * start the processing, the actual work, getting config params, get data from network etc
     */
    private void doServiceWork() throws ClientProtocolException, IOException
    {
        String FILENAME="blichData";
        String info=null;
        String classLetter = null,classNum1=null;
        int classNum = 0;
        try{
            FileInputStream fis=openFileInput(FILENAME);
            byte[] dataArray = new byte[fis.available()];
            while(fis.read(dataArray)!=-1)
            {
                info = new String(dataArray);
            }
            classLetter = info.substring(0, info.lastIndexOf(" "));
            classNum1 =info.substring(info.lastIndexOf(" ")+1);
            classNum=Integer.parseInt(classNum1);
            fis.close();
        }catch (Exception e){

        }
        if (classLetter!=null && classNum1!=null) {
            Oldhtml=readHTMLfromFile();
        if (GetHTML.isHavingChanges(classLetter,classNum))
        {
            myNotify();
            writeHTMLtoFile(currHtml);
            /*
            try {
                String data= "false";
                FileOutputStream fos = openFileOutput("blichService", Context.MODE_PRIVATE);
                fos = openFileOutput("blichService",Context.MODE_PRIVATE);
                fos.write(data.getBytes());
                fos.close();
                }
                catch (Exception e) {}
                */
        }
        }
;
        }



    /*
     * shutting down the service
     */
    private void _shutdownService()
    {
      if (timer != null) timer.cancel();
      Log.i(getClass().getSimpleName(), "Timer stopped...");
    }
    public void writeHTMLtoFile(String html) {
        try {
            String FILENAME = "blichNotifyData";
            String data= html;
            FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
            fos = openFileOutput(FILENAME,Context.MODE_PRIVATE);
            fos.write(data.getBytes());
            fos.close();

        }
            catch (Exception e){}
    }
    public String readHTMLfromFile() {
        String FILENAME = "blichNotifyData";
        String info="";
        try{
            FileInputStream fis=openFileInput(FILENAME);
            if (fis.available()>0)
            {
            byte[] dataArray = new byte[fis.available()];
            while(fis.read(dataArray)!=-1)
            {
             info = new String(dataArray);
            }
            fis.close();
            }
        else {
            Oldhtml="null";
        }
        }
        catch (Exception e) {}
        return info;

}
    public void myNotify()
    {
        NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Intent intent= new Intent (this,SchoolBlichActivity.class);
        PendingIntent pi = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_ONE_SHOT);
        String body = " בליך";
        String title = "ישנם שינויים חדשים!";
        Notification n =new Notification(R.drawable.table, body, System.currentTimeMillis());
        n.flags |=Notification.FLAG_AUTO_CANCEL;
        n.setLatestEventInfo(getApplicationContext(), title, body, pi);
        n.defaults = Notification.DEFAULT_ALL;
        number++;
        n.number=number;
        nm.notify(0,n);


    }

    }

如果需要的话，HTML 提取类:

public class GetHTML {
    public static boolean isHavingChanges(String classLetter,int classNum) throws ClientProtocolException, IOException {
            int classLetterCode = 0;
            int timeTableCode=1;
            if (classLetter.equals("ט"))
                classLetterCode=0;
            else if (classLetter.equals("י"))
                classLetterCode=1;
            else if (classLetter.equals("יא"))
                classLetterCode=2;
            else if (classLetter.equals("יב"))
                classLetterCode=3;
            switch(classLetterCode)
            {
            case 0:
                if (classNum>=1 && classNum<=7)
                    timeTableCode=1;
                else if (classNum>7 && classNum<=14)
                    timeTableCode=2;
                break;
            case 1:
                if (classNum>=1 && classNum<=7)
                    timeTableCode=3;
                else if (classNum>7 && classNum<=14)
                    timeTableCode=4;
                break;
            case 2:
                if (classNum>=1 && classNum<=7)
                    timeTableCode=5;
                else if (classNum>7 && classNum<=14)
                    timeTableCode=6;
                break;
            case 3:
                if (classNum>=1 && classNum<=7)
                    timeTableCode=7;
                else if (classNum>7 && classNum<=14)
                    timeTableCode=8;
                break;
            }
            String url = "http://blich.iscool.co.il/DesktopModules/IS.TimeTable/MainScreen.aspx?pid=17&mid=6264&page="+timeTableCode+"&msgof=0&static=1";
        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet(url);
        HttpResponse response = client.execute(request);

        String html = "";
        InputStream in = response.getEntity().getContent();
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        StringBuilder str = new StringBuilder();
        String line = null;
        while((line = reader.readLine()) != null)
        {
            str.append(line);
        }
        in.close();
        html = str.toString();
        html = Jsoup.parse(html).text();
        if (NotifyService.Oldhtml.equalsIgnoreCase(html)) {
            return false;
        }
        if (timeTableCode%2!=0){
            for (int i=0;i<8;i++) {
                if (!html.contains(i+" "+i)) {
                    NotifyService.currHtml=html;
                        return true;
                    }

                }
            }

        if (timeTableCode%2==0) {
            for (int i=8;i<15;i++) {
                if (!html.contains(i+" "+i)) {
                    NotifyService.currHtml=html;
                        return true;
                }
            }
        }

        return false;
}
}

忽略外语。 xD我只是想了解我做错了什么？谢谢

Answer 1

虽然我无法直接判断代码的哪一部分有问题，但您可以尝试使用 Eclipse MAT 通过 DDMS 获取的堆转储来分析内存使用情况。您需要使用 hprofconv 工具将 Android 堆转储转换为 MAT 可以理解的格式。

要获取 HPROF 堆转储，请打开 Dalvik 调试监视器 (DDMS)，将其连接到您的模拟器，选择应用程序的进程，然后点击“转储 HPROF 文件”图标。