DialogFragment 和 onDismiss

我正在使用一个DialogFragment，我是这样展示的Activity:

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

我想检查一下什么时候DialogFragment被驳回（例如，当按下后退按钮时），但在我的Activity。我怎样才能做到这一点？我怎样才能“告诉”我的activity那DialogFragment已被解雇？

实施您的 ActivityOnDismissListener

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OnDismissListener，只需重写该方法并调用 Activity 即可。

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);
        }
    }

}

如果您使用以下命令从片段启动对话框childFragment管理器（API>=17），您可以使用getParentFragment与父片段上的 onDismissListener 对话：

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);
        } 
    }

}