9

过去一周左右我一直在努力让它工作，但仍然不知道问题是什么。它适用于android 2.1，但不适用于4.1。我在检查我的应用程序更新的服务中得到了这个字符串。

latestVersion = Integer.parseInt(getHttpString(urlLatestVersion));

它在 checkForUpdate() 中调用；在 onStart(Intent intent, int startId); 中调用。

private String getHttpString(String urlString) throws IOException {
            InputStream in = null;
            int response = -1;

            URL url = new URL(urlString);
            URLConnection conn = url.openConnection();

            if (!(conn instanceof HttpURLConnection))
                    throw new IOException("Not an HTTP connection");

            try {
                    HttpURLConnection httpConn = (HttpURLConnection) conn;
                    httpConn.setAllowUserInteraction(false);
                    httpConn.setInstanceFollowRedirects(true);
                    httpConn.setRequestMethod("GET");
                    httpConn.connect();

                    response = httpConn.getResponseCode();
                    if (response == HttpURLConnection.HTTP_OK) {
                            in = httpConn.getInputStream();
                    }
            } catch (Exception ex) {
                    ex.printStackTrace();
                    //
                    //main error currently lies here
                    // TODO fix errors that accures on android 4.0 and above.
                    //
            }
            if (in != null) {
                    StringBuilder sb = new StringBuilder();
                    String line;

                    try {
                            BufferedReader reader = new BufferedReader(
                                            new InputStreamReader(in, "UTF-8"));
                            while ((line = reader.readLine()) != null) {
                                    sb.append(line); // .append("\n");
                            }
                    } finally {
                            in.close();
                    }
                    return sb.toString();
            } else
                    return "";

    }

这是来自 logcat 的错误

W/System.err( 7077): android.os.NetworkOnMainThreadException
W/System.err( 7077):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
W/System.err( 7077):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
W/System.err( 7077):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
W/System.err( 7077):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
W/System.err( 7077):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
W/System.err( 7077):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
W/System.err( 7077):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:341)
W/System.err( 7077):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
W/System.err( 7077):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
W/System.err( 7077):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
W/System.err( 7077):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
W/System.err( 7077):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
W/System.err( 7077):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
W/System.err( 7077):    at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
W/System.err( 7077):    at com.lukemovement.roottoolbox.pro.Update.getHttpString(Update.java:166)
W/System.err( 7077):    at com.lukemovement.roottoolbox.pro.Update.checkForUpdate(Update.java:98)
W/System.err( 7077):    at com.lukemovement.roottoolbox.pro.Update.onStart(Update.java:75)
W/System.err( 7077):    at android.app.Service.onStartCommand(Service.java:450)
W/System.err( 7077):    at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2620)
W/System.err( 7077):    at android.app.ActivityThread.access$1900(ActivityThread.java:143)
W/System.err( 7077):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1306)
W/System.err( 7077):    at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err( 7077):    at android.os.Looper.loop(Looper.java:137)
W/System.err( 7077):    at android.app.ActivityThread.main(ActivityThread.java:4935)
W/System.err( 7077):    at java.lang.reflect.Method.invokeNative(Native Method)
W/System.err( 7077):    at java.lang.reflect.Method.invoke(Method.java:511)
W/System.err( 7077):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
W/System.err( 7077):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
W/System.err( 7077):    at dalvik.system.NativeStart.main(Native Method)
I/Example update( 7077): Invalid int: ""

那么android是否已经放弃了向后兼容或者只是忘记添加这个位？

我读到我需要使用 AsyncTask。但我似乎无法让它为我工作，有人可以帮我解决这个问题吗？

4

2 回答 2

9

从 Android API v15 开始，它不需要在主线程上工作的繁重进程。所以你应该将你的逻辑移动到另一个线程，比如下面的源代码：

new Thread(new Runnable() {
   public void run() {
        // your logic
   }                        
}).start();

更多信息请参考：响应性

于 2012-09-07T02:14:24.433 回答
0

只需将此代码添加到您调用 Asynck 的活动的 oncreate 中。

代码：-

StrictMode.ThreadPolicy policy =
    new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
于 2013-05-29T14:01:57.120 回答