Question

我尝试将数据发送到网络服务器。

第一。我只使用HttpResponse来了解数据是否已在设备中发送并且可以正常工作

我尝试让ResponseHandler知道在网络服务器中发送或未读取数据。

我创建两个回复。

当数据未发送或失败时，
他们两个，错误信息和吐司是显示和工作

但是当发送数据时，显示toast但错误信息未显示，然后强制关闭

这是我的代码

private boolean SendDataFoto(CPetakRecord rec){


        String slon=String.format("%f", rec.dLongitude);
        String slat=String.format("%f", rec.dLatitude);
        String sacc=String.format("%f", rec.dAccuracy);
        String jnsHm=String.format(rec.jenisHm);
        String jmlHm=String.format(rec.jumlahHm);
        String jnsMsh=String.format(rec.jenisMsh);
        String jmlMsh=String.format(rec.jumlahMsh);
        String intens=String.format(rec.intensitas);
        String luasAncam=String.format(rec.luasTerancam);
        String nmPetak=String.format(rec.nmPetak);
        String code=String.format(rec.code);
        String userId=String.format(rec.userId);
        String varietas=String.format(rec.varietas);
        String dbLon=String.format("%f", rec.dbLon);
        String dbLat=String.format("%f", rec.dbLat);


        File file=new File(rec.sFilename);
        String sfname=file.getName();
        String cfname=file.getName();
        String lfname=rec.sFilename;
        sfname = sfname.substring(0, sfname.lastIndexOf("."));
        Calendar cal=Calendar.getInstance();
        cal.setTime(new Date(rec.lDate));
        String sdat=CUtilities.DateToString(cal);


        String url;
        String spetak;
        if (CGeneral.nPetakTetap==CGeneral.ACTIVITY_FOR_PETAK){
            url = CGlobalConfig.getURLRcvrPetak();
            spetak="petak";
        }
        else{
            url = CGlobalConfig.getURLRcvrPeliharaImage();
            spetak="pelihara";
        }

        Bitmap bmp=BitmapFactory.decodeFile(lfname);
        ByteArrayOutputStream bao = new ByteArrayOutputStream();

        bmp.compress(Bitmap.CompressFormat.JPEG, 90, bao);

        byte[] ba = bao.toByteArray();

        HttpEntity entity=null;

        try {

            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(url);
            ByteArrayBody bab = new ByteArrayBody(ba, spetak+"_"+cfname);
            MultipartEntity reqEntity = new MultipartEntity(
            HttpMultipartMode.BROWSER_COMPATIBLE);
            reqEntity.addPart("image", bab);
            reqEntity.addPart("category", new StringBody(spetak));
            reqEntity.addPart("foto", new StringBody(spetak+"_"+cfname));//
            reqEntity.addPart("tgl", new StringBody(sdat));//
            reqEntity.addPart("lat_petak", new StringBody(slat));//
            reqEntity.addPart("lon_petak", new StringBody(slon));//
            reqEntity.addPart("accuracy", new StringBody(sacc));
            reqEntity.addPart("jenis_hama", new StringBody(jnsHm));//
            reqEntity.addPart("jumlah_hama", new StringBody(jmlHm));//
            reqEntity.addPart("jenis_musuh", new StringBody(jnsMsh));//
            reqEntity.addPart("jumlah_musuh", new StringBody(jmlMsh));//
            reqEntity.addPart("int_serangan", new StringBody(intens));//
            reqEntity.addPart("luas_terancam", new StringBody(luasAncam));//
            reqEntity.addPart("nama_petak", new StringBody(nmPetak));//
            reqEntity.addPart("code_db", new StringBody(code));//
            reqEntity.addPart("user_id", new StringBody(userId));//
            reqEntity.addPart("varietas", new StringBody(varietas));//
            reqEntity.addPart("lon_db", new StringBody(dbLon));//
            reqEntity.addPart("lat_db", new StringBody(dbLat));//

            httppost.setEntity(reqEntity);
            HttpResponse response = httpclient.execute(httppost);
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String response2 = httpclient.execute(httppost, responseHandler);
            //if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            final String reverseString = response2;
            runOnUiThread(new Runnable() {
                  public void run() {
                      Toast.makeText(UpdateLog.this, "response : " + reverseString, Toast.LENGTH_LONG).show();
                  }
                });
            entity = response.getEntity();
            //}

        }

        catch (final ClientProtocolException e) {
            runOnUiThread(new Runnable() {
                  public void run() {
                      Toast.makeText(UpdateLog.this, "CPE response " + e.toString(), Toast.LENGTH_LONG).show();
                  }
                });
        // TODO Auto-generated catch block
        } catch (final IOException e) {
            runOnUiThread(new Runnable() {
                  public void run() {
                      Toast.makeText(UpdateLog.this, "IOE response " + e.toString(), Toast.LENGTH_LONG).show();
                  }
                });
        // TODO Auto-generated catch block
        }
        catch (Exception e) {
            Log.e(e.getClass().getName(), e.getMessage());
        }
        String temp = null;

        try {

            if(entity == null){
                publishProgress(0,"Send Fail");
                SystemClock.sleep(500);
                return false;
            }
            else{
            temp = EntityUtils.toString(entity);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }



        if (temp.compareTo("SUCCESS") == 0) {
            publishProgress(0,"Send Ok");
            SystemClock.sleep(500);
            return true;
        }
        else{
            publishProgress(0,"Send Fail");
            return false;               
        }   

    }

这是我的logcat

03-28 00:38:43.421: ERROR/AndroidRuntime(3028): FATAL EXCEPTION: AsyncTask #2
03-28 00:38:43.421: ERROR/AndroidRuntime(3028): java.lang.RuntimeException: An error occured while executing doInBackground()
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at android.os.AsyncTask$3.done(AsyncTask.java:200)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.util.concurrent.FutureTask.run(FutureTask.java:138)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.lang.Thread.run(Thread.java:1019)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028): Caused by: java.lang.NullPointerException
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at hariff.ltis.petaktetap.UpdateLog$MyAsyncTaskPetak.SendDataFoto(UpdateLog.java:961)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at hariff.ltis.petaktetap.UpdateLog$MyAsyncTaskPetak.doInBackground(UpdateLog.java:814)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at hariff.ltis.petaktetap.UpdateLog$MyAsyncTaskPetak.doInBackground(UpdateLog.java:1)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
03-28 00:38:43.421: ERROR/AndroidRuntime(3028):     ... 4 more

错误在行if (temp.compareTo("SUCCESS") == 0) {

中

如何解决这个问题？我希望在发送数据时一起显示toast和错误消息。

Answer 1

在这里：

if(entity == null){
    publishProgress(0,"Send Fail");
    SystemClock.sleep(500);
    return false;
}

似乎抛出异常会阻止代码运行return false。捕获到异常，但temp仍未初始化。所以你看到几行NullPointerException。

你应该看到初始错误的橙色堆栈跟踪，解决那里的错误，这个NullPointerException将不再是一个问题。（您可能还想将return false;添加到catch块中。

最后我假设SystemClock.sleep(500);是问题，阻塞任何线程是不必要的，你应该使用一个处理程序和Runnable来延迟后运行代码。

将数据发送到Web服务器时强制关闭

1 个答案: