android - 更新旧的android项目

Question

我正在关注这个tutorial我可以让它正常工作，但是当我尝试更新 UI 以适应 android 4.2 中的新 Holo.Light 时，应用程序在启动时崩溃，我不知道为什么。

我一直在寻找更新 UI 的方法，但我无法让它工作。

我想知道是否有人可以帮助我？告诉我怎么做？给我一个你知道有用的链接？甚至自己做？

我得到这个错误日志:

11-20 09:50:39.523: I/dalvikvm(1460): threadid=3: reacting to signal 3
11-20 09:50:39.682: I/dalvikvm(1460): Wrote stack traces to '/data/anr/traces.txt'
11-20 09:50:39.892: I/dalvikvm(1460): threadid=3: reacting to signal 3
11-20 09:50:40.003: I/dalvikvm(1460): Wrote stack traces to '/data/anr/traces.txt'
11-20 09:50:40.102: D/AndroidRuntime(1460): Shutting down VM
11-20 09:50:40.102: W/dalvikvm(1460): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
11-20 09:50:40.132: E/AndroidRuntime(1460): FATAL EXCEPTION: main
11-20 09:50:40.132: E/AndroidRuntime(1460): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidhive.jsonparsing/com.androidhive.jsonparsing.AndroidJSONParsingActivity}: android.os.NetworkOnMainThreadException
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.os.Looper.loop(Looper.java:137)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.ActivityThread.main(ActivityThread.java:4424)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at java.lang.reflect.Method.invokeNative(Native Method)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at java.lang.reflect.Method.invoke(Method.java:511)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at dalvik.system.NativeStart.main(Native Method)
11-20 09:50:40.132: E/AndroidRuntime(1460): Caused by: android.os.NetworkOnMainThreadException
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at java.net.InetAddress.getAllByName(InetAddress.java:220)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at com.androidhive.jsonparsing.JSONParser.getJSONFromUrl(JSONParser.java:38)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at com.androidhive.jsonparsing.AndroidJSONParsingActivity.onCreate(AndroidJSONParsingActivity.java:53)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.Activity.performCreate(Activity.java:4465)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
11-20 09:50:40.132: E/AndroidRuntime(1460):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
11-20 09:50:40.132: E/AndroidRuntime(1460):     ... 11 more
11-20 09:50:40.392: I/dalvikvm(1460): threadid=3: reacting to signal 3
11-20 09:50:40.412: I/dalvikvm(1460): Wrote stack traces to '/data/anr/traces.txt'
11-20 09:50:40.791: I/dalvikvm(1460): threadid=3: reacting to signal 3
11-20 09:50:40.962: I/dalvikvm(1460): Wrote stack traces to '/data/anr/traces.txt'

Answer 1

您正在主线程上进行网络调用。这在 Android 4.2 上是不允许的，并且在允许这样做的早期版本上是一个非常糟糕的主意。我在 http://blog.stylingandroid.com/archives/833 上发表了关于将网络和其他繁重的调用从主线程中移出的各种机制的博客。 .

在没有看到您的代码的情况下，我无法开始建议您使用哪种方法是正确的，但希望我文章中的信息能帮助您决定正确的方法。