如果我使用移动数据而不是wifi,Android无法运行

时间:2015-09-05 10:08:22

标签: java android android-wifi android-permissions

当我启动我的Android应用程序并尝试使用WiFi数据进行登录过程时,它没问题。 但是,如果我再次启动应用程序并尝试使用移动数据执行相同的过程,则该过程仍会等到我收到错误。

代码是:

class AsyncLogin extends AsyncTask< String, String, String > {
    String username, password;

    protected void onPreExecute() {
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("Login...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    protected String doInBackground(String... params) {
        username = params[0];
        password = params[1];

        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost post = new HttpPost(URI_login);
        post.setHeader("content-type", "application/json");

        try {
            JSONObject jpost = new JSONObject();
            jpost.put("password", password);
            jpost.put("username", username);

            StringEntity entity = new StringEntity(jpost.toString(),"UTF-8"); 
            entity.setContentEncoding("UTF-8");
            entity.setContentType("application/json");

            post.setEntity(entity);
            HttpResponse resp = httpClient.execute(post);
            resultado = EntityUtils.toString(resp.getEntity());

            System.out.println("Nos llega: "+ resultado.toString() +"");

          **//UPDATE, I was returning null**
        } catch (JSONException e) {
            e.printStackTrace();
            return "e-json"; //
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return "e-encoding";
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            return "e-client";
        } **catch (IOException e) {   ***//Now, this is the error***
            e.printStackTrace();
            return "e-io";**
        }

        return resultado.toString();

    }
    protected void onPostExecute(String result) {
       pDialog.dismiss();
       Log.e("onPostExecute=",""+result);

       if (result.equals("ok")){
           Intent i = new Intent(MainActivity.this, HiScreen.class);
           i.putExtra("user_hi", username);
           Log.e("onPostExecute= ", "Login is correct");
           login_ok();
           startActivity(i);
       }else{
            Log.e("onPostExecute= ", result);
       }
    }

首先,我认为这是由于权限,但我补充说:

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

然后,Logcat返回我: [UPDATE]

org.apache.http.conn.HttpHostConnectException: Connection to http://192.168.1.104:8080 refused at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183) 
        at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:374)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:575)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:498)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:476)
    at com.josvalbae.androidrest_1.MainActivity$AsyncLogin.doInBackground(MainActivity.java:196)
    at com.josvalbae.androidrest_1.MainActivity$AsyncLogin.doInBackground(MainActivity.java:1)
    at android.os.AsyncTask$2.call(AsyncTask.java:288)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at android.os.AsyncTask$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.net.ConnectException: failed to connect to /192.168.1.104 (port 8080): connect failed: ETIMEDOUT (Connection timed out)
    Caused by: android.system.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)

我认为,权限没有问题。

问题在于,我不知道是否由于过程或其他方面有多长。 [超时错误] 我在互联网上寻找但是我没有&#39;有任何想法。

谢谢!

1 个答案:

答案 0 :(得分:2)

192.168.*个地址属于专用网络,因此无法从Internet访问。请参阅Wikipedia上的文章,即所谓的16位块。

当你使用WiFi时,它会起作用,因为你在网络上并输入它,它会将它转发到路由器,路由器将提供适当的页面(注意请求永远不会真正到达互联网)。但是,在移动数据上,没有路由器,只有单元塔没有实现此接口,您最终将尝试查找Internet上不存在的页面。加载最有可能挂起(某些东西识别地址,但它无法提供请求的页面),直到连接超时,导致给定的异常。

如果没有进一步的背景,我无法提供任何解决方案。