java-IntentService冻结了我的应用程序用户界面

概述在我的应用程序中,我正在使用Intentservice从服务器获取数据,并将获取的数据存储到本地sqlitedb中.我正在使用5IntentService来获取并填充五个表.每个意向服务的数据最多可包含300行.我该怎么办？IntentService代码：publicclassSendBpRecordServerextendsIntentService{

在我的应用程序中,我正在使用Intentservice从服务器获取数据,并将获取的数据存储到本地sqlite db中.我正在使用5 IntentService来获取并填充五个表.每个意向服务的数据最多可包含300行.我该怎么办？

IntentService代码：

public class SendBpRecordServer extends IntentService {    DbHelper dbHelper;    public static final String TAG="BP Service";    public JsONObject finalData;    public SendBpRecordServer() {        super("BP");        dbHelper=new DbHelper(this);        Log.i("In Constructor",TAG);    }    @OverrIDe    protected voID onHandleIntent(Intent intent) {        String recname=intent.getStringExtra("naMetag");        if (recname.equals("fetch"))        {            Log.i("Send Data","Yes");            fetchDatFromServer();            ResultReceiver resultReceiver=intent.getParcelableExtra("receiverTagBP");            Log.d("BP Reseult ",resultReceiver.toString());            Bundle bun= new Bundle();            bun.putBoolean("Process_Complete_bp",true);            resultReceiver.send(2, bun);        }        else {            Log.i("InsIDe Service PUT BP ","Yes");            dataCollected();        }    }    private voID fetchDatFromServer() {        Response.Listener Listener=new Response.Listener<JsONObject>()        {            @OverrIDe            public voID onResponse(JsONObject response) {                Log.i("Json Array Response", response.toString());                try                {                    Boolean responseStatusCondition=response.getBoolean("success");                    if (responseStatusCondition)                    {                        JsONArray JsonArray=response.getJsONArray("response");                        Log.i("Array Size is",Integer.toString(JsonArray.length()));                        for (int i=0;i<JsonArray.length();i++)                        {                            JsONObject childJsONObject = JsonArray.getJsONObject(i);                            //Set the flag bit to 1 since data is already at server                            long result=dbHelper.insertIntoBloodPressureDetails(childJsONObject.getInt("systolic"), childJsONObject.getInt("diastolic"),  childJsONObject.getLong("timestamp"),1 );                           // Log.i("Insertion result ",Long.toString(result));                        }                        Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT"));                        c.set(Calendar.HOUR_OF_DAY, 0);                        c.set(Calendar.MINUTE, 0);                        c.set(Calendar.SECOND, 0);                        c.set(Calendar.MILliSECOND, 0);                        //This is mIDnight time in GMT                        long unixTimeStamp = c.getTimeInMillis();                        //Convert it in to Indian time System                        long indianMIDNightTime=unixTimeStamp-19800000;                        //Log.i("Now Calculates Days","doing");                        dbHelper.calculateDays(dbHelper.bptablename, dbHelper.bpColUMN_days, dbHelper.bpColUMN_timestamp, indianMIDNightTime);                    }                }catch (JsONException Js)                {                    Js.printstacktrace();                }            }        };        Response.ErrorListener errorListener=new Response.ErrorListener() {            @OverrIDe            public voID one rrorResponse(VolleyError error) {                NetworkResponse response = error.networkResponse;                //   Handle Error                if (error instanceof TimeoutError || error instanceof NoConnectionError) {                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), " this Network Error", Toast.LENGTH_SHORT).show();                } else if (error instanceof AuthFailureError) {                    //Todo                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), "User not authorized", Toast.LENGTH_SHORT).show();                } else if (error instanceof ServerError && response != null)                {                    try {                        String res = new String(response.data,                                httpheaderParser.parseCharset(response.headers, "utf-8"));                        // Now you can use any deserializer to make sense of data                        JsONObject obj = new JsONObject();                        obj.put("New Error",res);                        Log.i("New Server Error",obj.toString());                    } catch (UnsupportedEnCodingException e1) {                        // Couldn't properly decode data to string                        e1.printstacktrace();                    } catch (JsONException e2) {                        // returned data is not JsONObject?                        e2.printstacktrace();                    }                } else if (error instanceof NetworkError) {                    //Todo                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), "Network Error", Toast.LENGTH_SHORT).show();                } else if (error instanceof ParseError) {                    //Todo                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), "Error consuming request", Toast.LENGTH_SHORT).show();                }                else error.printstacktrace();            }        };        String bp_url=Constants.url+"bp";        JsonObjectheader customrequest=new JsonObjectheader(bp_url, null, Listener, errorListener);        RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());        requestQueue.add(customrequest);    }    private voID dataCollected() {        JsONArray JsonArray=new JsONArray();        ArrayList<Graph> arrayList=dbHelper.fetchDataFromBp();        for (int i=0;i<arrayList.size();i++)        {            Graph graph=new Graph();            graph=arrayList.get(i);            try {                JsONObject JsonObject=new JsONObject();                JsonObject.put("systolic",graph.getHeight());                JsonObject.put("diastolic",graph.getWeight());                JsonObject.put("timestamp",graph.getTime());                JsonArray.put(JsonObject);            }catch (JsONException Js)            {                Js.printstacktrace();            }        }        finalData=new JsONObject();        try {            finalData.put("bp",JsonArray);        }catch (JsONException Js)        {            Js.printstacktrace();        }        sendDatatoServer();    }    private voID sendDatatoServer()    {        Response.Listener Listener=new Response.Listener<JsONObject>()        {            @OverrIDe            public voID onResponse(JsONObject response) {                try {                    // Parsing Json object response                    // response will be a Json object                    //Toast.makeText(getApplicationContext(),response.toString(),Toast.LENGTH_LONG).show();                    Boolean responseStatusCondition = response.getBoolean("success");                    Log.i("Response BP",responseStatusCondition.toString());                    if (responseStatusCondition)                        dbHelper.setTheFlagBptable();                    else                        Log.i("Something Went Wrong"," On Server");                }                catch (JsONException k)                {                    Log.i("On Response",k.getMessage());                    k.printstacktrace();                }            }        };        Response.ErrorListener errorListener=new Response.ErrorListener() {            @OverrIDe            public voID one rrorResponse(VolleyError error) {                //   Handle Error                if (error instanceof TimeoutError || error instanceof NoConnectionError) {                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), " this Network Error", Toast.LENGTH_SHORT).show();                } else if (error instanceof AuthFailureError) {                    //Todo                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), "User not authorized", Toast.LENGTH_SHORT).show();                } else if (error instanceof ServerError) {                    //Todo                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), "Server error", Toast.LENGTH_SHORT).show();                } else if (error instanceof NetworkError) {                    //Todo                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), "Network Error", Toast.LENGTH_SHORT).show();                } else if (error instanceof ParseError) {                    //Todo                    error.printstacktrace();                    Toast.makeText(getApplicationContext(), "Error consuming request", Toast.LENGTH_SHORT).show();                }                else error.printstacktrace();            }        };        Log.i("Bp Final Data",finalData.toString());        JsonObjectheader customrequest=new JsonObjectheader(Request.Method.PUT, Constants.url+"bp", finalData, Listener, errorListener);        RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());        requestQueue.add(customrequest);    }}

调用intentservice的代码：

Log.i("Fetch BP Data ", SendBpRecordServer.TAG);            resultReceiverBP=new MyResultReceiver(new Handler());            resultReceiverBP.setReceiver(this);            Log.i("Bp resultreceiver ",resultReceiverBP.toString());             Intent intent2=new Intent(this,SendBpRecordServer.class);             intent2.putExtra("naMetag","fetch");             intent2.putExtra("receiverTagBP",resultReceiverBP);             startService(intent2);

并在完成任务时向我发送代码

在onReceiveResult ..中,结果代码通过调用的intentservice发送,并且当计数达到5时,启动mainactivity(尽管此技巧不起作用,即在未完成分配给intentservice的任务的情况下启动mainactivity).

@OverrIDe    public voID onReceiveResult(int resultCode, Bundle resultData) {        // Todo auto-generated method stub        Log.d("Diabetes","received result from Service= "+resultData.getString("ServiceTag"));       // Log.d("BMI ","received result from Service= "+resultData.getString("ServiceTag"));       /* if (progressDialog.isShowing()) {            progressDialog.dismiss();        }*/        Log.i("Get Values ",Integer.toString(Constants.getValues));        if (resultCode==0 && resultData.getBoolean("Process_Complete"))            Constants.getValues++;        if (resultCode==1 && resultData.getBoolean("Process_Complete_bmi"))            Constants.getValues++;        if (resultCode==2 && resultData.getBoolean("Process_Complete_bp"))            Constants.getValues++;        if (resultCode==3 && resultData.getBoolean("Process_Complete_med_stats"))            Constants.getValues++;        if (resultCode==4 && resultData.getBoolean("Process_Complete_one"))            Constants.getValues++;        if (Constants.getValues==5)        {            Constants.getValues=0;            if (progressDialog.isShowing()) {                progressDialog.dismiss();            }            startActivity(new Intent(this,MainActivity.class));            finish();        }    }

解决方法:

您是否绝对确定是UI冻结的根本原因是IntentService？意图服务是专门设计用于在工作线程中运行的,以便从主(UI)线程中卸载处理,其主要原因之一是有助于防止UI冻结.

也许尝试在UI级别开始调试工作.特别是,什么是在启动ResultReceiver时将其提供给IntentService的,以及在该接收者实例中的onReceiveResult回调方法中做什么？

除此之外,对于您遇到冻结的活动,请检查您正在执行哪种 *** 作.从主线程上的数据库中加载大量数据(即,不使用Loader或类似的方法将处理任务卸载到工作线程中)是导致UI冻结的常见原因,至少就目前为止我是这样.

更新

我想我已经解决了问题所在.有两个主要问题,都取决于您如何使用Volley.将请求添加到Volley队列时,该请求将异步执行.这意味着队列方法会立即返回.在您的意图服务代码中,这意味着该服务立即继续告诉ResultReceiver它已完成处理,而实际上它所完成的只是将请求排队.所有五个Intent服务都将执行此 *** 作,这意味着MainActivity将很快输入.这是第一个问题.

第二个问题说明了您遇到的冻结问题.尽管Volley在工作线程上执行请求,但它返回对主线程上的请求的已解析响应-请参阅文档here.这意味着您正在intent服务中进行的所有响应处理(将数据放入数据库等). )实际上发生在主(UI)线程上.这解释了冻结.

您在这里可能想要做的是改为使用Volley的RequestFuture.通过允许您阻止直到请求完成,这基本上将异步请求转换为同步请求.为此,请创建适当类型的Future(在您的情况下为JsONObject),并将其设置为请求的侦听器和错误侦听器.然后,像现在一样对请求进行排队,然后在以后立即调用get方法.该方法将阻塞,直到响应完成处理为止.可以在意图服务中执行此 *** 作,因为它在工作线程而不是UI线程上运行.

如果请求成功,您将获得返回的数据,并且可以执行Response.Listener实现中当前包含的所有逻辑.如果发生错误(即由于某种原因请求失败),将来的请求将引发异常,您可以处理该异常以采取任何适当的措施.

使用请求期货是与使用侦听器的完全不同的方法,您可能需要对代码进行一些更改才能使其正常工作,但是它应该可以解决您遇到的问题.

希望能对您有所帮助,我诚挚的歉意不提早发现此错误.

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