Android DialogFragment Tutorial

DialogFragment is a unique type of fragment that is used to display dialog boxes or pop-up windows. It provides a reusable way to display and manage dialog boxes, allowing the state of the dialog to be saved when the screen is rotated or the configuration changes.

The usage of DialogFragment is as follows:

1. Create a subclass that inherits from DialogFragment.
2. Override the onCreateDialog() method in the subclass to create and return an AlertDialog or other dialog instance.
3. Use FragmentManager to create and display an instance of DialogFragment where you need to show a dialog.
4. You can customize the layout of a dialog and add interactive controls by overriding the onCreateView() method.
5. You can handle the event of a dialog being dismissed by either overriding the onDismiss() method or implementing the DialogInterface.OnDismissListener interface.
6. You can pass arguments between DialogFragments using the getArguments() method.

The sample code is as follows:

public class MyDialogFragment extends DialogFragment {

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("Dialog Title")
                .setMessage("Dialog Message")
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // 处理确定按钮点击事件
                    }
                })
                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // 处理取消按钮点击事件
                    }
                });
        return builder.create();
    }
}

To initiate a DialogFragment instance where a dialog box needs to be displayed, you can use the following code.

MyDialogFragment dialogFragment = new MyDialogFragment();
dialogFragment.show(getSupportFragmentManager(), "dialog");

In a DialogFragment, you can also customize the layout of the dialog by using the following method:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_dialog, container, false);
    // 添加用户交互控件，并设置相关事件监听器
    Button button = view.findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // 处理按钮点击事件
        }
    });
    return view;
}

You can use the dismiss() method to close the dialog box.

dialogFragment.dismiss();

You can handle the event of a dialog closing by either overriding the onDismiss() method or implementing the DialogInterface.OnDismissListener interface.

@Override
public void onDismiss(DialogInterface dialog) {
    super.onDismiss(dialog);
    // 处理对话框关闭事件
}