DialogFragment 和 onDismiss [英] DialogFragment and onDismiss

问题描述

我正在使用 DialogFragment，我在 Activity 中显示它是这样的:

I am using a DialogFragment, which I am showing like this from an Activity:

DialogFragmentImage dialog = DialogFragmentImage.newInstance(createBitmap());
dialog.onDismiss(dialog);.onDismiss(this);          
dialog.show(getFragmentManager(), "DialogFragmentImage");

我想检查 DialogFragment 何时被解除(例如按下后退按钮时)，但在我的 Activity 中.我怎样才能做到这一点?我如何告诉"我的 activity DialogFragment 已被解除?

I would like to check when the DialogFragment was dismissed (for example when the back button was pressed), but in my Activity. How can I do that? How can I "tell" my activity that the DialogFragment has been dismissed?

推荐答案

让你的Activity实现OnDismissListener

Make your Activity implement OnDismissListener

public final class YourActivity extends Activity implements DialogInterface.OnDismissListener {

    @Override
    public void onDismiss(final DialogInterface dialog) {
        //Fragment dialog had been dismissed
    }

}

DialogFragment 已经实现了 OnDismissListener，只需覆盖该方法并调用 Activity.

DialogFragment already implements OnDismissListener, just override the method and call the Activity.

public final class DialogFragmentImage extends DialogFragment {

    ///blah blah

    @Override
    public void onDismiss(final DialogInterface dialog) {
        super.onDismiss(dialog);
        final Activity activity = getActivity();
        if (activity instanceof DialogInterface.OnDismissListener) {
            ((DialogInterface.OnDismissListener) activity).onDismiss(dialog);
        }
    }

}

如果您使用 childFragment 管理器 (API>=17) 从片段启动对话框，则可以使用 getParentFragment 与父级上的 onDismissListener 对话片段.:

If you're starting the dialog from a fragment using the childFragment manager (API>=17), you can use getParentFragment to talk to the onDismissListener on the parent fragment.:

public final class DialogFragmentImage extends DialogFragment {

    ///blah blah

    @Override
    public void onDismiss(final DialogInterface dialog) {
        super.onDismiss(dialog);
        Fragment parentFragment = getParentFragment();
        if (parentFragment instanceof DialogInterface.OnDismissListener) {
            ((DialogInterface.OnDismissListener) parentFragment).onDismiss(dialog);
        } 
    }

}

这篇关于DialogFragment 和 onDismiss的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！