A。我想使用AlertDialogBox Anonymous类创建Popup,如下所示:
private void showPopupChangeCurrency(final CharSequence[] items, final String title){
...
myAlert = new AlertDialogBox() { //This is anonymous class
@Override
protected void setButtonRight() {
...
}
...
}
B。问题:当改变方向或语言时,我得到了下面的InstantiationExceptionFC问题:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.loudlex/com.loudlex.setting.CloudSettings}: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.loudlex.setting.CloudSettings$5: make sure class name exists, is public, and has an empty constructor that is public
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3195)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3291)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1743)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7010)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:731)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:621)
Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.loudlex.setting.CloudSettings$5: make sure class name exists, is public, and has an empty constructor that is public
at android.app.Fragment.instantiate(Fragment.java:642)
at android.app.FragmentState.instantiate(Fragment.java:114)
at android.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1873)
at android.app.FragmentController.restoreAllState(FragmentController.java:122)
at android.app.Activity.onCreate(Activity.java:1010)
at com.loudlex.utility.ConfWindow.onCreate(ConfWindow.java:60)
at com.loudlex.setting.CloudSettings.onCreate(CloudSettings.java:105)
at android.app.Activity.performCreate(Activity.java:6786)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3148)
C。问题:我想知道是否有任何解决方案可以很好地处理匿名类。
注意。我知道有一些方法可以克服这个问题,例如:使用公共静态嵌套类或分离到顶级类。感谢
您有三种解决方案:
- 在单独的类中移动
CloudSettings
-
将您的内部类更改为
public static
public static class CloudSettings extends DialogFragment
-
调用
myAlert.setRetainInstance(true);
控制是否在整个"活动"中保留片段实例重新创建(如配置更改)
参考:http://developer.android.com/reference/android/app/Fragment.html#setRetainInstance(布尔值)