Question

我试图在Android中使用HttpClient()抓取网页的HTML代码。 getbodyHtml返回空，而在输出中，我看到HTML代码打印正常。我做错了什么？

class GetResult implements Runnable {
    public volatile String bodyHtml;
    public volatile boolean finished = false;

    @Override
    public void run() {
        finished = false;
        HttpClient httpClient = new DefaultHttpClient();
        try {
            String myUri = "http://google.com";

            HttpGet get = new HttpGet(myUri);

            HttpResponse response = httpClient.execute(get);

            bodyHtml = EntityUtils.toString(response.getEntity());
            //return bodyHtml;

            finished = true;
            System.out.println(bodyHtml);


        } catch (IOException e) {
            System.out.println(e.getMessage());
        }


    }

    public String getbodyHtml(){
        return bodyHtml;
    }
}

而且：

String rs = "";
GetResult foo = new GetResult();
new Thread(foo).start();
if (foo.finished = true){
   rs = foo.getbodyHtml();
}

edittext2.setText(rs);

Answer 1

因为检查时Foo没有完成，所以不要输入if。要更正此调用foo.join（），请执行以下操作：

                String rs = "";
                GetResult foo = new GetResult();
                new Thread(foo).start();
                foo.join(); // will wait till foo finish

                rs = foo.getbodyHtml();


            edittext2.setText(rs);

Android Java：字符串返回空，而不是？

1 个答案: