将另一个按钮的背景放在按钮背景Xamarin上

Question

我想制作

如果我单击Button1，主ButtonBackground图像= Button1.Background图像。

如果我单击Button2，主按钮背景图像= Button2.Background图像。

我想让我的应用程序拥有大约80个imageButton和角色。如果我学习一种方法，我的工作必须更加轻松。

My.cs

protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);
    SetContentView(Resource.Layout.layout1);

    Button btn1 = (Button)FindViewById(Resource.Id.btn1);
    Button btn2 = (Button)FindViewById(Resource.Id.btn2);
    Button btnMain = (Button)FindViewById(Resource.Id.btnMain);

    btn1.Click += delegate {
        btnMain.SetBackgroundResource(/*I cant fill in method*/);                
    };
    btn2.Click += delegate {
        btnMain.SetBackgroundResource(/*I cant fill in method*/);
    };
}

layout1.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:gravity="center">
    <Button
        android:text="Button 1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn1"
        android:background="@drawable/btn_yellow" />
    <Button
        android:text="Button 2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn2"
        android:background="@drawable/btn_green" />
    <Button
        android:text="Main Button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnMain" />
</LinearLayout>

Answer 1

您不需要多个lambdas，而不是使用SetBackgroundResource，您可以使用setBackgroundDrawable / getBackgroundDrawable，它在Xamarin中支持属性Background：

Button btnMain;

protected override void OnCreate(Bundle bundle)
{
    base.OnCreate(bundle);
    SetContentView(Resource.Layout.layout1);

    Button btn1 = (Button)FindViewById(Resource.Id.btn1);
    Button btn2 = (Button)FindViewById(Resource.Id.btn2);
    btnMain = (Button)FindViewById(Resource.Id.btnMain);

    btn1.Click += ChangeBackground;
    btn2.Click += ChangeBackground;
}

private void ChangeBackground(object sender, EventArgs e)
{
    var btn = sender as Button;
    btnMain.Background = btn.Background;
}