DialogFragment是从Activity还是Fragment打开的？

Posted 2021-03-31

我想检测是否从Activity或Fragment打开DialogFragment。因为调用Activity或Fragment将为侦听器附加一个接口。

如果Activity用于显示对话框:(在DialogFragment里面我会写）

listener = (MyListener) getActivity();

否则，如果Fragment正在调用对话框：

listener = (MyListener) getParentFragment;

所以，我需要检测谁在调用对话框片段！

答案

If you ask me to edit your code then do this.

void showDialog() {
    DialogFragment newFragment = new MyAlertDialogFragment();
    newFragment.setFromActivity(true); pass here.
    newFragment.show(getFragmentManager(), "dialog");
}

在你的DialogFragment

public static class MyAlertDialogFragment extends DialogFragment {
   boolean isFromActivity;
   public void setFromActivity(boolean isFromActivity){
    this.isFromActivity = isFromActivity;
   }
}

If you ask me a suggestion - Pass listener instead of checking from Activity or Fragment.

您应该使用setter来执行常用代码，以便将来可以传递侦听器。

DialogFragment newFragment = new MyAlertDialogFragment();
newFragment.setListener(this); // or use anonymous deriving like new Listener()...

另一答案

我使用以下样式作为我的问题，发布作为答案，因为它可能会帮助某人。

public MyDialog extends DialogFragment{
    private MyListener listener;

    public static MyDialog newInstance(MyListener callback){
        MyDialog dialog = new MyDialog();
        dialog.listener = callback;
        return dialog;
    }

    //rest of the Dialog code such as onCreate() etc..

}

并从Any Activity或Fragment调用

活动

public MyActivity extends AppCompatActivity implements MyListener{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.my_layout);

    MyDialog dialog = MyDialog.newInstance(this);
    dialog.show(getSupportFragmentManager, "TAG");
    }

}

分段

public MyFragment extends Fragment implements MyListener{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.my_frag_layout, container, false);

    MyDialog dialog = MyDialog.newInstance(this);
    dialog.show(getChildFragmentManager, "TAG"); 

    return view;
}

}

如果有任何可能的错误或可能崩溃的情况，请评论。谢谢！