如何使用Android中HTTPGET请求？ [英] How to use HttpGet Request in Android?

问题描述

我用这code，但它捕获在一个try-catch错误。哪里是一个错误？

当我打印错误， content.setText（ex.getMessage（））; 为空

下面是相关code：

 公共类MainActivity延伸活动{    TextView的内容;
    FNAME的EditText，电子邮件;    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;        内容=（的TextView）findViewById（R.id.content）;
        按钮saveme =（按钮）findViewById（R.id.save）;
        saveme.setOnClickListener（新Button.OnClickListener（）{
            公共无效的onClick（视图v）{
                Toast.makeText（getBaseContext（），请稍候，连接到服务器，Toast.LENGTH_LONG）.show（）;                尝试{
                    字符串loginValue = URLEn coder.en code（FFA，UTF-8）;
                    字符串fnameValue = URLEn coder.en code（fdsfdb，UTF-8）;                    HttpClient的客户端=新DefaultHttpClient（）;
                    串的URL =HTTP：//mysite/app.php一个=+ loginValue +和b =+ fnameValue;                    尝试{
                        串SetServerString;
                        HTTPGET HTTPGET =新HTTPGET（URL）;
                        ResponseHandler所＆LT;串GT; ResponseHandler所=新BasicResponseHandler（）;
                        SetServerString = Client.execute（HTTPGET，ResponseHandler所）;
                        content.setText（SetServerString）;
                    }赶上（例外前）{
                        content.setText（ex.getMessage（））;
                    }
                }赶上（UnsupportedEncodingException前）{
                    content.setText（ex.getMessage（））;
                }
            }
        }）;
    }
}
 

解决方案

我想你NetworkOnMainThreadException。你应该在后台线程中执行网络通信。考虑使用IntentService或AsyncTask的。

I am using this code, but it catches an error in a try-catch. Where is a mistake?

When I print a error, content.setText(ex.getMessage()); is empty.

Here is the relevant code:

public class MainActivity extends Activity {

    TextView content;
    EditText fname, email;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        content = (TextView) findViewById(R.id.content);
        Button saveme = (Button) findViewById(R.id.save);
        saveme.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(getBaseContext(), "Please wait, connecting to server.", Toast.LENGTH_LONG).show();

                try {
                    String loginValue = URLEncoder.encode("ffa", "UTF-8");
                    String fnameValue = URLEncoder.encode("fdsfdb", "UTF-8");

                    HttpClient Client = new DefaultHttpClient();
                    String URL = "http://mysite/app.php?a=" + loginValue + "&b=" + fnameValue;

                    try {
                        String SetServerString;
                        HttpGet httpget = new HttpGet(URL);
                        ResponseHandler<String> responseHandler = new BasicResponseHandler();
                        SetServerString = Client.execute(httpget, responseHandler);
                        content.setText(SetServerString);
                    } catch (Exception ex) {
                        content.setText(ex.getMessage());
                    }
                } catch (UnsupportedEncodingException ex) {
                    content.setText(ex.getMessage());
                }
            }
        });
    }
}

解决方案

I think you get NetworkOnMainThreadException. You should perform network communication on background thread. Consider using IntentService or AsyncTask.

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