2

我正在做一个小型的 android 项目，第一个功能是连接到我的服务器并执行 php 解析器以获取一些文章。我在创建时调用此方法：

private String jsonTaker() throws IOException, JSONException {  
    //call EventsTaker class -> take the 'articles'
    JsonReader jsr = new JsonReader();

    JSONObject json =     jsr.readJsonFromUrl("http://jem88.net/timeSpaceParser.php");
    System.out.println(json.toString());
    System.out.println(json.get("id"));

    return json.toString();
}

这是readJsonFromUrl()和readAll()方法：

public JSONObject readJsonFromUrl(String url) throws IOException, JSONException {
    InputStream is = new URL (url).openStream();
    //sia maledetto il creatore di java e tutta la sua genia diojavosogeloso
    InputStreamReader isr = new InputStreamReader(is, Charset.forName("UTF-8"));
    BufferedReader rd = new BufferedReader(isr);
    String jsonText = readAll(rd);
    JSONObject json = new JSONObject(jsonText);
    Log.d("readJsonFromUrl", "String to json transformed!");
    is.close();
    return json;        
}

private static String readAll(Reader rd) throws IOException {
    StringBuilder sb = new StringBuilder();
    int cp;
    while ((cp = rd.read()) != -1) {
        sb.append((char) cp);
    }
    return sb.toString();
}

在调试模式下出现错误，执行到达readJsonFromUrl()方法的第一行，我尝试打开流。此处应用程序因“找不到源”错误而崩溃。我试过用谷歌搜索这个，但没有一个建议对我有好处！所以，任何建议都会很棒！

编辑-> 我已经编辑了异常的管理，现在我捕获了一个致命异常。这是日志猫：

06-04 23:46:56.411: D/AndroidRuntime(22456): Shutting down VM
06-04 23:46:56.411: W/dalvikvm(22456): threadid=1: thread exiting with uncaught exception (group=0x40e312a0)
06-04 23:46:56.436: E/AndroidRuntime(22456): FATAL EXCEPTION: main
06-04 23:46:56.436: E/AndroidRuntime(22456): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jem88.timespace/com.jem88.timespace.MainActivity}: android.os.NetworkOnMainThreadException
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.ActivityThread.access$700(ActivityThread.java:140)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.os.Looper.loop(Looper.java:137)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.ActivityThread.main(ActivityThread.java:4921)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at java.lang.reflect.Method.invokeNative(Native Method)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at java.lang.reflect.Method.invoke(Method.java:511)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at dalvik.system.NativeStart.main(Native Method)
06-04 23:46:56.436: E/AndroidRuntime(22456): Caused by: android.os.NetworkOnMainThreadException
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at java.net.URL.openStream(URL.java:462)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at com.jem88.timespace.JsonReader.readJsonFromUrl(JsonReader.java:44)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at com.jem88.timespace.MainActivity.jsonTaker(MainActivity.java:46)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at com.jem88.timespace.MainActivity.onCreate(MainActivity.java:23)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.Activity.performCreate(Activity.java:5206)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
06-04 23:46:56.436: E/AndroidRuntime(22456):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074)
06-04 23:46:56.436: E/AndroidRuntime(22456):    ... 11 more
4

1 回答 1

0

只是把它放在与主线程分开的线程中，我自己测试了你的代码

    Thread tr=new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            try {
            Log.v("Alefon", jsonTaker());   
            } catch (IOException e) {
                // TODO Auto-generated catch block
                Log.e("Alefon", "errr"+e.getMessage());
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                Log.e("Alefon", "errr "+e.getMessage());
            }
        }
    });

    tr.start();

使用 AsyncTask 的做法会更好，请参阅：链接

于 2013-06-04T22:16:27.543 回答