简单的REST API获取呼叫无法正常工作的Android

Question

以下代码无法正常工作。

String url = "http://my/url/username/pswd";
String result = "";

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    TextView tv;
    tv = (TextView) findViewById(R.id.text1);

    HttpClient httpclient = new DefaultHttpClient();  
    HttpGet request = new HttpGet(url);  
    request.addHeader("apikey", "DeveloperWy7ayxR");
    request.addHeader("Content-Type","application/json");

    ResponseHandler handler = new BasicResponseHandler();  
    try {  
        result = httpclient.execute(request, handler);  
    } catch (ClientProtocolException e) {  
        e.printStackTrace();  
    } catch (IOException e) {  
        e.printStackTrace();  
    }  

    httpclient.getConnectionManager().shutdown();  
    Log.i("myLog", result); 

    tv.setText(result);
}

我使用高级rest客户端测试了url和标头，它起作用了。 我错过了什么吗？

Answer 1

您应该在后台进行网络操作。例如，在AsyncTask中运行代码

有关更多信息，请参见android.os.NetworkOnMainThreadException

并在android manifest.xml文件中添加网络权限：

<uses-permission android:name="android.permission.INTERNET"/>