android - 如何在android的AsyncTask中长时间运行XML解析时避免ANR？

Question

我正在从服务器下载文件，然后在执行此操作时解析并插入本地数据库我使用进度条显示操作进度。由于文件非常大，因此解析需要 2-4 分钟，因此我收到 ANR在进度条上，下载完成后进度条也没有更新，它只显示 50% 的进度。如何避免此 ANR？我附上我的代码如下...

@Override
    protected void onPreExecute() 
    {
            flag = false;
            progressCount = 0;
            ProgressDialog progressBar = DdownoadProgressBar(context,
            progressCount);
            progressBar.show(); 

    }

    @Override
    protected Integer doInBackground(String... urls) {
        checkNetworkConnection();

        if (connectionFlag) {
            downloadFile1();
            progressCount = 1;
            publishProgress(progressCount);

            downloadFile2();
            progressCount = 2;
            publishProgress(progressCount);

            downloadFile3();
            progressCount = 3;
            publishProgress(progressCount);

            downloadFile4();
            progressCount = 4;
            publishProgress(progressCount);

            downloadFile5();
            progressCount = 5;
            publishProgress(progressCount);

            downloadFile6();
            progressCount = 6;
            publishProgress(progressCount);

            downloadflag = true;
        }
        return null;
    }


    @Override
    protected void onProgressUpdate(Integer... progress) 
    {
        Log.v(TAG, "In progressUpdate...");

        progressBar.setProgress(progressCount);

    }

    @Override
    protected void onPostExecute(Integer progress) {
        if (downloadflag) {
            try {

                Log.v(TAG, "Inside onPostExecute....");

                 parseFile1();
                 progressCount=7;
                 publishProgress(progressCount);

                 parseFile2();
                 progressCount=8;
                 publishProgress(progressCount);

                 parseFile3();
                 progressCount=9;
                 publishProgress(progressCount);

                 parseFile4();
                 progressCount=10;
                 publishProgress(progressCount);

                 parseFile5();
                 progressCount=11;
                 publishProgress(progressCount);

                 parseFile6();
                 progressCount=12;
                 publishProgress(progressCount);

                 progressBar.dismiss();
                 Toast.makeText(SynchronizeData.this,"Data is successfully downloaded from server.......", Toast.LENGTH_LONG).show();

            } catch (Exception e) {

                e.printStackTrace();
            }
        } else {

            progressBar.dismiss();

            Toast.makeText(
                    getApplicationContext(),
                    "File is not downloaded....Error in network connection...........",Toast.LENGTH_LONG).show();
            Log.v(TAG, "File is not downloaded...............");

        }
    }

Answer 1

将您的解析逻辑移至 doInBackground 方法中。没有理由在后台线程上进行网络调用并在 UI 线程上进行解析。