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下面的代碼在我電腦上的java文件上運行，給出了「/ pws/client/pdf/offers-in-store-10-11-16」的正確結果.PDF「JSOUP html parse在android設備上給出不同的結果vs windows機器
String pdfLink= null;
try {
Document doc = Jsoup.connect("http://www.dunnesstores.com/offer20/food-wine/fcp-category/home").get();
Element links = doc.select("a[title=\"Download offers in store\"]").first();
System.out.println(links.attr("href"));
} catch (IOException e) {
//e.printStackTrace();
}
然而，當我運行一個應用程序它是由按下按鈕激活的Android設備上的代碼，我得到一個空指針異常‘pdfLink = links.attr（’HREF」） ;」所以它沒有找到鏈接「/pws/client/pdf/offers-in-store-10-11-16.pdf」出於任何原因。在我的Android應用程序中，代碼位於按鈕的onclick監聽器上，通過代碼，它激活上點擊並運行的代碼行權，但無論出於何種原因JSOUP沒有找到link.Below是Android代碼
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnFetchData = (Button) findViewById(R.id.buttonTest);
btnFetchData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new FetchWebsiteData().execute();
}
});
}
private class FetchWebsiteData extends AsyncTask<Void, Void, Void> {
private String pdfLink = "didnt work";
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
try {
Document doc = Jsoup.connect("http://www.dunnesstores.com/offer20/food-wine/fcp-category/home").get();
//Elements links = doc.select("a[title=\"Download offers in store\"]");
Element links = doc.select("a[title=\"Download offers in store\"]").first();
pdfLink=links.attr("href");
} catch (IOException e) {
//e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
TextView txttitle = (TextView) findViewById(R.id.resultTextView);
txttitle.setText(pdfLink);
}
}
}