Does DisplayActionSheet exist in Xamarin.Android?

问题

I am new to mobile development. I'm trying to write an app in both Xamarin iOS and Xamarin Android. After searching for a couple of days, I keep finding that DisplayActionSheet is part of Xamarin Forms, but I can't find the equivalent in Xamarin Android. Does DisplayActionSheet not exist? Is there anything else I can use to get the same look and effect?

Thank you!

Update: Here's my progress... I'm trying to make a dialog that looks like this the image here: https://www.google.com/search?q=displayactionsheet+image&rlz=1C1GGRV_enUS752US754&tbm=isch&source=iu&ictx=1&fir=EWVc1vOm1JJrhM%253A%252CYaPWhxv5zFphhM%252C_&usg=__v_-JK4lHAj8k50h5iknuPLPc8PM%3D&sa=X&ved=0ahUKEwjbz66zzZHaAhUKY6wKHXyxB64Q9QEIKTAA#imgrc=EWVc1vOm1JJrhM: So far, I can get the image to slide up and the buttons to respond correctly, but the one thing I'm missing is the behavior when the user clicks outside of the dialog. I want it to be dismissed, but nothing is happening. Thank you for your help!

Here is my code:

//MyActivity.cs

public class MyActivity : Activity
{
    FrameLayout _fragmentContainer;

    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.MyView);
        var listView = FindViewById<ListView>(Resource.Id.myView);
        listView.Adapter = new EmailSettingsAdapter(this);
        TextView action = FindViewById<TextView>(Resource.Id.actionText);

        _fragmentContainer = FindViewById<FrameLayout>(Resource.Id.frameContainer);

        action.Click += click;
    }

    private void click(object sender, EventArgs e)
    {
        FragmentTransaction transaction =     FragmentManager.BeginTransaction();
        MonthlyStmtFragment fragment = new MonthlyStmtFragment();
        transaction.Add(_fragmentContainer.Id, fragment, "Fragment");
        transaction.Commit();
        _fragmentContainer.TranslationY = 1800;
        _fragmentContainer.Animate().TranslationYBy(-600).SetDuration(500);
    }
}

//MyFragment.cs
public class MyFragment : DialogFragment
{
    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        View view = inflater.Inflate(Resource.Layout.FragmentLayout, container, false);

        TextView text1 = view.FindViewById<TextView>(Resource.Id.text1);
        text1.Click += delegate {
            Dismiss();
            Toast.MakeText(Activity, "selected", ToastLength.Short).Show();
        };

        TextView cancel = view.FindViewById<TextView>(Resource.Id.cancelText);
        cancel.Click += delegate {
            Dismiss();
            Toast.MakeText(Activity, "cancel", ToastLength.Short).Show();
        };

        return view;
    }

//FragmentLayout.axml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/transparent">
<TextView
    android:text="Title Here"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/titleView1"
    android:gravity="center_horizontal"
    android:background="#fff5f5f5"
    android:textSize="8dp"
    android:textColor="#ff9e9e9e"
    android:padding="10dp" />
<View
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:id="@+id/view1"
    android:background="#ffbdbdbd" />
<TextView
    android:text="Text 1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/text1"
    android:background="#fff5f5f5"
    android:gravity="center_horizontal"
    android:textColor="#ff1e88e5"
    android:padding="10dp"
    android:textSize="10dp" />
<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/cancelText"
    android:background="#fff5f5f5"
    android:textSize="10dp"
    android:text="Cancel"
    android:textColor="#ff1e88e5"
    android:padding="10dp"
    android:gravity="center_horizontal"
    android:layout_marginTop="10dp" />
</LinearLayout>

回答1:

What you are looking for is AlertDialog Class in android :

A subclass of Dialog that can display one, two or three buttons.

Following are the detailed guide you can work with to achieve it :

https://www.c-sharpcorner.com/blogs/how-to-show-alert-dialog-in-android-using-xamarin

http://stacktips.com/tutorials/xamarin/alertdialog-and-dialogfragment-example-in-xamarin-android

For Customization of this you can use the following :

http://www.appliedcodelog.com/2015/11/custom-alertdialog-example-in.html

Goodluck, Happy Coding!

 class DialogFragmentExitPopUp : DialogFragment
{
    public static Activity mActivity;
    public DialogFragmentExitPopUp NewInstance(Activity activity,Bundle bundle)
    {
        var fragment = new DialogFragmentExitPopUp();
        fragment.Arguments = bundle;
        DialogFragmentExitPopUp.mActivity = activity;
        return fragment;
    }

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle SavedInstanceState)
    {
        View view = inflater.Inflate(Resource.Layout.ExitPopUp, container, false);
        Button ButtonYes = view.FindViewById<Button>(Resource.Id.ExitYes);
        Button ButtonNo = view.FindViewById<Button>(Resource.Id.ExitNo);
        ButtonYes.SetTextColor(Color.ParseColor("#2466A3"));
        ButtonNo.SetTextColor(Color.ParseColor("#2466A3"));
        ButtonYes.SetBackgroundColor(Color.White);
        ButtonNo.SetBackgroundColor(Color.White);
        Dialog.Window.RequestFeature(WindowFeatures.NoTitle);
        Dialog.SetCanceledOnTouchOutside(false);

        return view;
    }

}

You are not calling the constructor which is causing the issue initializing it like how I have shown you will do it.

And this is the code for calling the actual dialog:

 FragmentTransaction fragmentTransaction = FragmentManager.BeginTransaction();
        Fragment fragmentPrev = FragmentManager.FindFragmentByTag("dialog");
        if (fragmentPrev != null)
            fragmentTransaction.Remove(fragmentPrev);

        fragmentTransaction.AddToBackStack(null);
        //create and show the dialog
        DialogFragmentExitPopUp dialogFragment = new DialogFragmentExitPopUp().NewInstance(this, null);
        dialogFragment.Show(fragmentTransaction, "dialog");

来源：https://stackoverflow.com/questions/49492018/does-displayactionsheet-exist-in-xamarin-android