Question

我正在尝试调用外部xml，我有一些错误。

错误

06-02 04：32：21.085 1658-1658 / com.golftipp E / Ideas4All：错误 android.os.NetworkOnMainThreadException 在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork（StrictMode.java:1145） at java.net.InetAddress.lookupHostByName（InetAddress.java:385） at java.net.InetAddress.getAllByNameImpl（InetAddress.java:236） at java.net.InetAddress.getAllByName（InetAddress.java:214）在com.android.okhttp.internal.Dns $ 1.getAllByName（Dns.java:28）在com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress（RouteSelector.java:216）在com.android.okhttp.internal.http.RouteSelector.next（RouteSelector.java:122）在com.android.okhttp.internal.http.HttpEngine.connect（HttpEngine.java:292）在com.android.okhttp.internal.http.HttpEngine.sendSocketRequest（HttpEngine.java:255）在com.android.okhttp.internal.http.HttpEngine.sendRequest（HttpEngine.java:206）在com.android.okhttp.internal.http.HttpURLConnectionImpl.execute（HttpURLConnectionImpl.java:345）在com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse（HttpURLConnectionImpl.java:296）在com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream（HttpURLConnectionImpl.java:179）在java.net.URL.openStream（URL.java:470）在com.golftipp.IntroduceCodigo.loadCategories（IntroduceCodigo.java:111）在com.golftipp.IntroduceCodigo.irFormularioReserva（IntroduceCodigo.java:67） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:515）在android.view.View $ 1.onClick（View.java:3818）在android.view.View.performClick（View.java:4438）在android.view.View $ PerformClick.run（View.java:18422）在android.os.Handler.handleCallback（Handler.java:733）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:136）在android.app.ActivityThread.main（ActivityThread.java:5017） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:515）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:779）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595）在dalvik.system.NativeStart.main（本地方法）

代码

private Vector<datos_codigos> categories;
private String categories_url = "http://www.url.com/beta.xml";

public void loadCategories() {

    try {

        // Url del archivo XML
        URL url = new URL(categories_url);

        SAXParserFactory spf = SAXParserFactory.newInstance();
        SAXParser sp = spf.newSAXParser();

        XMLReader xr = sp.getXMLReader();
        // Utilizamos nuestro propio parseador (CategoryHandler)
        xmlSax myExampleHandler = new xmlSax();
        xr.setContentHandler(myExampleHandler);

        InputSource is = new InputSource(url.openStream());
        // Le indicamos la codificación para evitar errores
        is.setEncoding("UTF-8");
        xr.parse(is);

        // Asignamos al vector categories los datos parseados
        categories = myExampleHandler.getParsedData();
        System.out.println(myExampleHandler.getParsedData());


    } catch (Exception e) {
        // Ha ocurrido algún error
        Log.e("Ideas4All", "Error", e);
    }

}

Answer 1

为此，您必须在loadCategories()方法

中的异步任务中调用方法doInBackground

因为在4.0之后它不允许在你的主ui线程上进行网络呼叫。

    new AsyncTask<Void, Void, Void>() {
                @Override
                protected Void doInBackground(Void... params) {
                    // TODO Auto-generated method stub
                                   loadCategories();
                    return null;
                }
            }.execute();

Answer 2

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

javax.xml.parsers.SAXParser出错

2 个答案: