解决Fragment相关问题,java-lang-illegalstateexception-activity-has-been-destroyed
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开发时代码设计如下:FragmentActivity包含一个Fragment A ,B,C, 该Fragment A 中包含一个Viewpager+FragmentPagerAdapter的组合,当在Fragment A,B,C中切换时,遇到以下错误
错误1:Java.lang.IllegalStateException: Recursive entry to executePendingTransactions
按照网上的解决办法是,创建FragmentPagerAdapter 对象时,需使用getChildFragmentManager()方法替代getFragmentManager();
如:ListViewFragmentAdapter adapter = new ListViewFragmentAdapter(getChildFragmentManager());
viewpager.setAdapter(adapter);
改完之后运行,还是报错,但是是新错误
错误2:java.lang.illegalstateexception: activity has been destroyed
stackoverflow上面给的解决办法是重写onDetach方法,但经测试行不通,真正的解决办法:
在使用该Viewpager的Fragment中,重写方法
@Override
public void onDestroyView() {
// TODO Auto-generated method stub
super.onDestroyView();
try {
Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
childFragmentManager.setAccessible(true);
childFragmentManager.set(this, null);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
为什么在onDetach行不通呢,因为按照activity跟fragment的生命周期图来看,onDetach阶段fragment已经与activity脱离关系即fragment持有的activity对象已被置null,而onDestroyView阶段fragment中仍然保留与activity之间的关系,此时fragment持有的activity对象仍然有效。。亲测程序正常运行
解决方法参考自:http://stackoverflow.com/questions/15207305/getting-the-error-java-lang-illegalstateexception-activity-has-been-destroyed
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