具有兼容库的 Android Fragments

Question

我做不到。

我在这里发现了很多类似的问题，例子。但没有任何帮助，也没有任何作用。有没有人在 Android 2.2 中使用 android.support.v4 库运行 fragment ？ (如果你是，请将其上传到某处。)

我快哭了，因为我找不到问题所在!

这个错误和很多人一样:

05-15 18:20:20.583: W/dalvikvm(1521): Unable to resolve superclass of Lmy/fragment/test/FragmentTestActivity; (8)
05-15 18:20:20.583: W/dalvikvm(1521): Link of class 'Lmy/fragment/test/FragmentTestActivity;' failed
05-15 18:20:20.593: D/AndroidRuntime(1521): Shutting down VM
05-15 18:20:20.593: W/dalvikvm(1521): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-15 18:20:20.703: E/AndroidRuntime(1521): FATAL EXCEPTION: main
05-15 18:20:20.703: E/AndroidRuntime(1521): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{my.fragment.test/my.fragment.test.FragmentTestActivity}: java.lang.ClassNotFoundException: my.fragment.test.FragmentTestActivity in loader dalvik.system.PathClassLoader[/data/app/my.fragment.test-1.apk]
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.os.Looper.loop(Looper.java:123)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.app.ActivityThread.main(ActivityThread.java:4627)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at java.lang.reflect.Method.invokeNative(Native Method)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at java.lang.reflect.Method.invoke(Method.java:521)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at dalvik.system.NativeStart.main(Native Method)
05-15 18:20:20.703: E/AndroidRuntime(1521): Caused by: java.lang.ClassNotFoundException: my.fragment.test.FragmentTestActivity in loader dalvik.system.PathClassLoader[/data/app/my.fragment.test-1.apk]
05-15 18:20:20.703: E/AndroidRuntime(1521):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
05-15 18:20:20.703: E/AndroidRuntime(1521):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
05-15 18:20:20.703: E/AndroidRuntime(1521):     ... 11 more
05-15 18:20:23.423: I/Process(1521): Sending signal. PID: 1521 SIG: 9

已解决!!!!谁在错误前有此警告:

05-16 10:08:00.033: W/dalvikvm(1695): Unable to resolve superclass of Lmy/fragment/test/FragmentTestActivity; (7)
05-16 10:08:00.076: W/dalvikvm(1695): Link of class 'Lmy/fragment/test/FragmentTestActivity;' failed

应该将 android-support-v4 导出到您的应用:

配置 Java 构建路径 -> 订购和导出选项卡 -> 设置复选框 android-support-v4.jar

(可能需要先删除现有的)

它将把这个库移动到你的 apk 中(据我所知)

Answer 1

您应该有 1 个 FragmentActivity，其中包含 fragment 。您正在做的是尝试将 Activity ( fragment Activity )放入 xml 中。那行不通的。尝试只有 1 个顶级 fragmentactivity，然后将另一个变成 fragment ，然后将这些 fragment 放入您的 xml 中。