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[英]ClassCastException: Fragment1 cannot be cast to Fragment2
[英]how to replace the fragment1 from fragment2 from a button click of a dialog[NOT DIALOG FRAGMENT] (which is called by fragment1)
我正面临一个问题,我从 fragment1 打开一个对话框(对话框 1),并且 Dialog1 上有一个按钮(更改),如果我点击该按钮: Dialog1 应该被关闭,并且在同一个 fragment1 上应该被 fragment2 替换(另一个分段)
public class PedigreeAnalysis extends Fragment //My Fragment1
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
showDialog();
}
// SHOW DIALOG FUNCTION IS SHOWN BELOW `
void showDialog() { //Function to show the dialog starts...
Dialog dialog= new Dialog(getActivity());
Button btn = dialog.findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Code for opening new fragment and dismissing the dialog.
getActivity().getSupportFragmentManager().beginTransaction()
.replace(R.id.fragment1, new Fragment2()).commit();
dialog.dismiss();
}
});
}//Function Ends Here....
我什至尝试了相反的逻辑(首先关闭对话框,然后用 function 替换它,但它也不起作用)为:
dialog.dismiss();//First dismissing the dialog
getActivity().getSupportFragmentManager().beginTransaction()
.replace(R.id.fragment1, new Fragment2()).commit();//Replacing the fragment
按照这个...
片段1:
public class Fragment1 extends Fragment {
private ItemClickListener itemClickListener;
private Button addButton;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// all the views are initialized here...
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
addButton.setOnClickListener(v -> {
if (itemClickListener != null) onItemClicked.onClicked(new Plan());
});
}
public Fragment1 setItemClickListener(ItemClickListener itemClickListener) {
this.itemClickListener = itemClickListener;
return this;
}
public interface ItemClickListener {
void onItemClicked(Plan plan);
}
}
在父活动 Class
public class PlanActivity extends AppCompatActivity {
private Fragment1 fragment1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_plan);
fragment1 = new Fragment1()
.setOnAddButtonClicked(this::openFragmentEditPlan);
openFragment1();
}
private void openFragment1() {
getSupportFragmentManager().beginTransaction()
//frameLayout_PlanActivity is the container of both fragments
.add(R.id.frameLayout_PlanActivity, fragment1)
.commit();
}
public void openFragmentEditPlan(Plan plan) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.frameLayout_PlanActivity, FragmentEditPlan.newInstance(plan))
.addToBackStack("Fragment Edit Plan")
.commit();
}
}
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