Question

代码

private static final String TAG_SUCCESS = "success";

String URL_SERVER = "http://localhost/italk/servlet/login.ValidateUser";
//String URL_SERVER = "http://localhost/italk/servlet/login.ValidateUser";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    inputUserName = (EditText) findViewById(R.id.txtUserName);
    inputPassWord = (EditText) findViewById(R.id.txtPassWord);

    btnLogin = (Button) findViewById(R.id.btnLogin);
    btnLogin.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            //Neu login ->true
            new doLogin().execute();
        }   
    });
}

class doLogin extends AsyncTask<String, String, String> {

    /**
    * Getting product details in background thread
    * */
    protected String doInBackground(String... params) {

        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
        public void run() {
            // Check for success tag
            String success;
            try {
                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("user_name", inputUserName.getText().toString()));
                params.add(new BasicNameValuePair("pass_word", inputPassWord.getText().toString()));
                params.add(new BasicNameValuePair("db_name", "jdbc/ITTALKDS"));
                // getting product details by making HTTP request
                // Note that product details url will use GET request
                JSONObject json = jsonParser.makeHttpRequest(
                URL_SERVER, "GET", params);

                // check your log for json response
                //Log.d("Single Product Details", json.toString());

                // json success tag
                success = json.getString("result");
                if (success.equals("2")) {//Login successfully
                    pDialog = new ProgressDialog(MainActivity.this);
                    pDialog.setMessage("Login successfully...");
                    Intent i = new Intent(getApplicationContext(), AlliTalk.class);
                    startActivity(i);
                } else {
                    pDialog = new ProgressDialog(MainActivity.this);
                    pDialog.setMessage("Login failt...");
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        });

        return null;
    }
}

错误消息：

06-24 23:17:01.946: E/AndroidRuntime(7968): FATAL EXCEPTION: main
06-24 23:17:01.946: E/AndroidRuntime(7968): android.os.NetworkOnMainThreadException
06-24 23:17:01.946: E/AndroidRuntime(7968):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at libcore.io.IoBridge.connect(IoBridge.java:112)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at java.net.Socket.connect(Socket.java:842)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at com.italk.JSONParser.makeHttpRequest(JSONParser.java:64)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at com.italk.MainActivity$doLogin$1.run(MainActivity.java:74)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at android.os.Handler.handleCallback(Handler.java:725)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at android.os.Looper.loop(Looper.java:137)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at android.app.ActivityThread.main(ActivityThread.java:5041)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at java.lang.reflect.Method.invokeNative(Native Method)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at java.lang.reflect.Method.invoke(Method.java:511)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-24 23:17:01.946: E/AndroidRuntime(7968):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

您无法在UI线程上进行网络调用。将runOnUiThread()函数移动到要进行UI线程操作的位置。

Answer 2

这个问题已经在SO上进行了好几次，并且每次都已经解决了。

查看文章AsyncTask

编辑：我一开始没看到你的代码。您不应在runOnUIThread中制作httprequests。 stacktrace声明“主线程上的网络”。这意味着您应该在AsyncTask的{{1}}方法中执行网络部分，并从主线程更新UI。尝试获取doInBackground()的值并将其返回到主线程然后更新UI。查看之前链接的文章，以获得清晰的想法。

Answer 3

删除runOnUIThread()并直接在doInBackground()中发出请求。 doInBackground()中的任何代码都在一个单独的线程上运行，因此您不需要在那里运行。

Answer 4

只需删除后台线程中的runOnUiThread即可。因为doInBanckground已经使用单独的线程运行以在后台执行该过程

Android应用无法连接网络服务器？

4 个答案: