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[英]How do I pop android navigation backstack up to a certain fragment?
[英]How can I do with android Fragment backstack?
我有四个片段ABCD。当我执行从A到B的跳跃以及从B到C的跳跃以及从C到D的跳跃时,按返回键如何获得D到B的结果?
FragmentD:
在FragmentD中创建一个接口。
OnBackListener mback;
public interface OnBackListener {
public void onBackClicked();
}
@Override
public void onAttach(Activity activity) {
try {
mback = (OnBackListener ) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnBackListener");
}
super.onAttach(activity);
}
public void methodCall()
{
mback.onBackClicked()
}
然后
家长活动
实现我们在FragmentD中创建的OnBackListener接口。
public class MyActivity extends FragmentActivity implements OnBackListener {
// overriding OnBackListener interface method
@Override
public void onBackClicked() {
//calling fragmentb
}
//Backkey event
@Override
public void onBackPressed()
{
super.onBackPressed();
fragmentd.methodCall();
}
}
这样,您将得到fragmentD的结果到fragmentB。
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