Question

我正在开发一款使用Google云端硬盘作为数据库的应用。这是一个项目和必要的，所以请不要对此发表评论。

基本上，我正在使用jsoup抓取已发布的Google Doc。 jsoup doc解析数据，然后将其转换为Event，这是我在单独的类中声明的对象。问题是我无法获得任何数据。由于Android Studio中的onCreate方法无法抛出异常，因此我必须使用try和catch块。但是，由于这种情况，我无法使用doc创建任何TextView。这就是我到目前为止所做的：

    Document doc = null;

    String url = "https://docs.google.com/spreadsheets/d/e/2PACX-1vRAS7DEUoTqv9gKNSTg9XrgktfqZs1vw3L-eivZW2UPCOeSqiqt8Xdtsd3o-tmS9m-uTHCYn8JbToAx/pubhtml";

    try {
        doc = Jsoup.connect(url).get();
    } catch (Exception e) {
        e.printStackTrace();
    }

    String title = doc.title();
    String body = doc.body().text();

    List<Event> allEvents = new ArrayList<Event>();
    Element table = doc.select("table").get(0); //select the first table.
    Elements rows = table.select("tr");

    for (int i = 2; i < rows.size(); i++) { //first row is the col names so skip it, second is title. 
        Element row = rows.get(i);
        Elements cols = row.select("td");
        Event hold = new Event(cols.get(0).text(), cols.get(1).text(), cols.get(2).text(), cols.get(3).text());
        allEvents.add(hold);
    }

    for (Event x : allEvents) {
        x.createDateTime();
    }

    LinearLayout linearLayout = new LinearLayout(this);
    setContentView(linearLayout);
    linearLayout.setOrientation(LinearLayout.VERTICAL);

    for (int i = 0; i < allEvents.size(); i++) {
        TextView textView = new TextView(this);
        textView.setText(allEvents.get(i).toString());
        linearLayout.addView(textView);
    }

这会产生错误，因为我无法修改try块中的doc变量。我希望根本没有这个块，但不幸的是，我没有选择权。有什么提示吗？

Answer 1

像这样使用AsyncTask：

final Document[] doc = {null};

        final String url = "https://docs.google.com/spreadsheets/d/e/2PACX-1vRAS7DEUoTqv9gKNSTg9XrgktfqZs1vw3L-eivZW2UPCOeSqiqt8Xdtsd3o-tmS9m-uTHCYn8JbToAx/pubhtml";

        new AsyncTask<Void,Void, Void>() {

            @Override
            protected Void doInBackground(Void... voids) {
                try {
                    doc[0] = Jsoup.connect(url).get();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(Void aVoid) {
                super.onPostExecute(aVoid);

                List<Event> allEvents = new ArrayList<Event>();
                Element table = doc[0].select("table").get(0); //select the first table.
                Elements rows = table.select("tr");

                for (int i = 2; i < rows.size(); i++) { //first row is the col names so skip it, second is title.
                    Element row = rows.get(i);
                    Elements cols = row.select("td");
                    EventLog.Event hold = new EventLog.Event(cols.get(0).text(), cols.get(1).text(), cols.get(2).text(), cols.get(3).text());
                    allEvents.add(hold);
                }

                for (UsageEvents.Event x : allEvents) {
                    x.createDateTime();
                }

                LinearLayout linearLayout = new LinearLayout(SplashActivity.this);
                setContentView(linearLayout);
                linearLayout.setOrientation(LinearLayout.VERTICAL);

                for (int i = 0; i < allEvents.size(); i++) {
                    TextView textView = new TextView(SplashActivity.this);
                    textView.setText(allEvents.get(i).toString());
                    linearLayout.addView(textView);
                }
            }
        }.execute();

在onCreate方法中使用Jsoup

1 个答案: