在片段的onCreateview（）上显示警报对话框

Question

我是Android开发的新手。从我的Activity.java文件中，我正在检查Create_task菜单项是否单击。如果单击，我想显示一个弹出屏幕create_task（xml中的布局）。

activity.java

case R.id.create_task:
CreateTaskFragment createTaskFragment = new CreateTaskFragment();
                FragmentTransaction createTaskft = getSupportFragmentManager().beginTransaction();
                createTaskft.replace(R.id.flContent, createTaskFragment);
                createTaskft.commit(); 

createTaskFragment.java

public class CreateTaskFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.create_task, container, false);
        AlertDialog newTaskdialog = new AlertDialog.Builder(getContext())
                .setView(view)
                .create();
        newTaskdialog.show();
        newTaskdialog.setCanceledOnTouchOutside(true);
        return view;
    }

}

我当前运行时会遇到此错误：

指定的孩子已经有父母。您必须调用removeview（） 首先在孩子的父母上。

Answer 1

  AlertDialog alertDialog1 = new AlertDialog.Builder(
                getActivity()).create();

        alertDialog1.setTitle("Alert Dialog");
        alertDialog1.setMessage("this is alert dialog box");
        alertDialog1.setIcon(R.drawable.tick);
        alertDialog1.setButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(getContext(),
                        "You clicked on OK", Toast.LENGTH_SHORT).show();
            }
        });

        alertDialog1.show();