Question

我有一个关于dialogfragment的问题 - 我通过教程创建了一个带有dialogfragment的类，但在教程中，按钮单击显示了对话框片段 - 我想通过单击MainActivity中的片段选项卡来显示dialogfragment - 我可以＆＃39 ;弄清楚如何...我有片段GetItem方法，我的代码中有空案例4 - 它是片段，我想通过点击它来打开dialogfragment。有我的代码。感谢您的帮助和解答！对不起，如果有事情不清楚..

-Problem是固定的（即注释） - 我创建了新的DialogFragment - xml文件和java类 - 来自guides.codepath.com/android/Using-DialogFragment#build-dialo g的代码然后我将这些代码添加到MainActivity

 tabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager) {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                super.onTabSelected(tab);
                int position = tab.getPosition();
                if (position == 4) {
                    showAlertDialog();
                }
            }
        });
    }
    private void showAlertDialog() {
        FragmentManager fm = getSupportFragmentManager();
        EditNameDialogFragment alertDialog = EditNameDialogFragment.newInstance("Some title");
        alertDialog.show(fm, "fragment_alert");
    }

Answer 1

您可能想要检测单击哪个标签并像其他任何

一样显示对话框

您需要添加TabLayout.OnTabSelectedListener

设置

tabLayout.setupWithViewPager(mViewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager) {
  @Override
  public void onTabSelected(TabLayout.Tab tab) {
      super.onTabSelected(tab);
      int position = tab.getPosition();
      if (position == 4) {
          // Create MediaFragment here
      } 
   }
});

Answer 2

查看android example：

public static class MyAlertDialogFragment extends DialogFragment {

public static MyAlertDialogFragment newInstance(int title) {
    MyAlertDialogFragment frag = new MyAlertDialogFragment();
    Bundle args = new Bundle();
    args.putInt("title", title);
    frag.setArguments(args);
    return frag;
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    int title = getArguments().getInt("title");

    return new AlertDialog.Builder(getActivity())
            .setIcon(R.drawable.alert_dialog_icon)
            .setTitle(title)
            .setPositiveButton(R.string.alert_dialog_ok,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        ((FragmentAlertDialog)getActivity()).doPositiveClick();
                    }
                }
            )
            .setNegativeButton(R.string.alert_dialog_cancel,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        ((FragmentAlertDialog)getActivity()).doNegativeClick();
                    }
                }
            )
            .create();
}

}

如何在片段中实现dialogfragment？

2 个答案: