Question

我的Android应用程序始终在Google Play控制台或Firebase上崩溃测试，但可以在本地设备或我的PC上的仿真器上正常运行。我用 Jsoup从网站获取内容

这是产生错误document = Jsoup.connect((String)"google.com").get();的代码，我认为这是原因

private class Title extends AsyncTask<Void, Void, Void> {
        String title;
        Document document;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }

        @Override
        protected Void doInBackground(Void... params) {
            try {
                // Connect to the web site
                 document = Jsoup.connect((String)"google.com").get();
                // Get the html document title
                title = document.title();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // Set title into TextView

            if(title.equals("WILLI")&&document!=null) {
                getWebsite(document);
            }
        }
    }

这是给我错误的日志：

java.lang.RuntimeException: An error occured while executing doInBackground()
FATAL EXCEPTION: AsyncTask #1
Process: com.ccs.itgvertretungsplan, PID: 10903
java.lang.RuntimeException: An error occured while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:300)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'int java.lang.Comparable.compareTo(java.lang.Object)' on a null object reference
    at java.util.Arrays.binarySearch(Arrays.java:524)
    at java.util.Arrays.binarySearch(Arrays.java:494)
    at org.jsoup.nodes.Entities$EscapeMode.codepointForName(Entities.java:52)
    at org.jsoup.nodes.Entities.isBaseNamedEntity(Entities.java:93)
    at org.jsoup.parser.Tokeniser.consumeCharacterReference(Tokeniser.java:172)
    at org.jsoup.parser.TokeniserState.readCharRef(TokeniserState.java:1684)
    at org.jsoup.parser.TokeniserState.access$100(TokeniserState.java:8)
    at org.jsoup.parser.TokeniserState$2.read(TokeniserState.java:36)
    at org.jsoup.parser.Tokeniser.read(Tokeniser.java:50)
    at org.jsoup.parser.TreeBuilder.runParser(TreeBuilder.java:49)
    at org.jsoup.parser.TreeBuilder.parse(TreeBuilder.java:43)
    at org.jsoup.parser.HtmlTreeBuilder.parse(HtmlTreeBuilder.java:56)
    at org.jsoup.parser.Parser.parseInput(Parser.java:32)
    at org.jsoup.helper.DataUtil.parseByteData(DataUtil.java:104)
    at org.jsoup.helper.HttpConnection$Response.parse(HttpConnection.java:666)
    at org.jsoup.helper.HttpConnection.get(HttpConnection.java:225)
    at com.ccs.itgvertretungsplan.SchuelerMyListFragment$Title.doInBackground(SchuelerMyListFragment.java:396)
    at com.ccs.itgvertretungsplan.SchuelerMyListFragment$Title.doInBackground(SchuelerMyListFragment.java:382)
    at android.os.AsyncTask$2.call(AsyncTask.java:288)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    ... 4 more

尝试连接到网站时发生NullPointerException

0 个答案: