android - 从互联网获取数据时应用卡住

Question

我遇到了一个问题，我确信它很容易解决，但我仍在开始应用程序开发，所以我认为你可以帮助我。我有一个应用程序，里面有一个货币转换器，当我按下按钮进行转换时，它在从互联网获取数据时卡住，然后在几秒钟后恢复正常。这是代码:

   public void capturaConversao(String m1, String m2) throws ClientProtocolException, IOException {
        BufferedReader resp = null;
        endereco = "http://download.finance.yahoo.com/d/quotes.csv?s=" + m1
                + m2 + "=X&f=sl1d1t1ba&e=.csv";
        try {
            HttpClient client = new DefaultHttpClient();
            HttpGet method = new HttpGet(endereco);
            HttpResponse statusCode = client.execute(method);
            resp = new BufferedReader(new InputStreamReader(statusCode
                    .getEntity().getContent()));
            StringBuffer sb = new StringBuffer("");
            String line = "";
            while ((line = resp.readLine()) != null) {
                sb.append(line);
            }
            resp.close();
            String result = sb.toString();
            String[] values = result.split(",");
            conversion = values[1];
            nextstep++;

        } finally {
            if (resp != null) {
                try {
                    resp.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    Toast.makeText(getBaseContext(), "Não foi possível se conectar à internet.", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }

Answer 1

AsyncTask是几乎所有 UI 线程问题的解决方案。 :)这是一个简短的 tutorial .