版权声明：本文为博主原创文章，未经博主允许转载随意。
https://blog.csdn.net/kebi007/article/details/52599522
说明一下：学习xamarin android一段时间，准备写一些xamarin android相关的例子，alertdialog也是使用的非常多得空间之一，非常感谢鸟巢上的小猪，我也是看着他写的教程学会的。参考他的那一章 http://www.runoob.com/w3cnote/android-tutorial-alertdialog.html
1.基本使用流程
- Step 1：创建AlertDialog.Builder对象；
- Step 2：调用setIcon()设置图标，setTitle()或setCustomTitle()设置标题；
- Step 3：设置对话框的内容：setMessage()还有其他方法来指定显示的内容；
- Step 4：调用setPositive/Negative/NeutralButton()设置：确定，取消，中立按钮；
- Step 5：调用create()方法创建这个对象，再调用show()方法将对话框显示出来；
2.几种常用的对话框使用示例
运行效果图：
主要代码：MainActivity.class
-
public
class
MainActivity :
Activity
-
{
-
int count =
1;
-
private Button btn_alertDialog_one, btn_alertDialog_two, btn_alertDialog_three, btn_alertDialog_four;
-
-
private
bool[] checkItems;
-
private AlertDialog alertDialog =
null;
-
private AlertDialog.Builder builder =
null;
-
protected override void OnCreate(Bundle bundle)
-
{
-
base.OnCreate(bundle);
-
SetContentView(Resource.Layout.Main);
-
bindViewClick();
-
}
-
-
private void bindViewClick()
-
{
-
btn_alertDialog_four = FindViewById<Button>(Resource.Id.btn_alertDialog_four);
-
btn_alertDialog_three = FindViewById<Button>(Resource.Id.btn_alertDialog_three);
-
btn_alertDialog_two = FindViewById<Button>(Resource.Id.btn_alertDialog_two);
-
btn_alertDialog_one = FindViewById<Button>(Resource.Id.btn_alertDialog_one);
-
-
btn_alertDialog_one.Click +=
delegate { onClick(btn_alertDialog_one); };
-
btn_alertDialog_two.Click +=
delegate { onClick(btn_alertDialog_two); };
-
btn_alertDialog_three.Click +=
delegate { onClick(btn_alertDialog_three); };
-
btn_alertDialog_four.Click +=
delegate { onClick(btn_alertDialog_four); };
-
}
-
private void onClick(View v)
-
{
-
switch (v.Id)
-
{
-
case Resource.Id.btn_alertDialog_one:
-
alertDialog =
null;
-
builder =
new AlertDialog.Builder(
this);
-
alertDialog = builder
-
.SetTitle(
"sure")
-
.SetMessage(
"are you sure exit?")
-
.SetNegativeButton(
"cancel", (s, e) =>
-
{
-
Toast.MakeText(
this,
"you click cancel", ToastLength.Short).Show();
-
})
-
.SetPositiveButton(
"sure", (s, e) =>
-
{
-
Toast.MakeText(
this,
"you click sure", ToastLength.Short).Show();
-
})
-
.SetNeutralButton(
"neutra", (s, e) => {
-
Toast.MakeText(
this,
"you click neutra", ToastLength.Short).Show();
-
})
-
.Create();
//创建alertDialog对象
-
-
alertDialog.Show();
-
var dialog =
new AlertDialog.Builder(
this);
-
break;
-
-
case Resource.Id.btn_alertDialog_two:
-
alertDialog =
null;
-
builder =
new AlertDialog.Builder(
this);
-
string[] players =
new
string[] {
"杜兰特",
"汤普森",
"考辛斯",
"卡戴珊"};
-
alertDialog = builder
-
.SetIcon(Resource.Drawable.players)
-
.SetTitle(
"选择你喜欢的球员")
-
.SetItems(players, (s, e) =>
-
{
-
Toast.MakeText(
this,
"you selected " + players[e.Which], ToastLength.Short).Show();
-
})
-
.Create();
-
alertDialog.Show();
-
break;
-
-
case Resource.Id.btn_alertDialog_three:
-
var a =
new AlertDialog.Builder(
this);
-
string[] teams =
new
string[] {
"骑士",
"公牛",
"快船",
"马刺",
"勇士" };
-
a.SetTitle(
"你认为下个赛季哪只球队能夺冠")
-
.SetSingleChoiceItems(teams,
0, (s, e) =>
-
{
-
Toast.MakeText(
this,
"you selected " + teams[e.Which], ToastLength.Short).Show();
-
})
-
.Create();
-
a.Show();
-
break;
-
-
case Resource.Id.btn_alertDialog_four:
-
var b =
new AlertDialog.Builder(
this);
-
string[] menu =
new
string[] {
"麻婆豆腐",
"羊蝎子",
"驴肉火烧",
"辣子鸡丁"};
-
checkItems =
new
bool[] {
false,
false,
false,
false};
-
b = b.SetIcon(Resource.Drawable.Icon)
-
.SetMultiChoiceItems(menu, checkItems, (s, e) => {
-
//Toast.MakeText(this, "you selected " + menu[e.Which], ToastLength.Short).Show();
-
checkItems[e.Which] = e.IsChecked;
-
})
-
.SetPositiveButton(
"确定", (s, e) => {
-
string result =
string.Empty;
-
for (
int i =
0; i < checkItems.Length; i++)
-
{
-
if (checkItems[i])
-
{
-
result += menu[i] +
",";
-
}
-
}
-
Toast.MakeText(
this,
"you selected " + result, ToastLength.Short).Show();
-
});
-
b.Create();
-
b.Show();
-
break;
-
}
-
}
-
}
用法非常简单创建一个Builder对象后，调用Create方法创建一个AlertDialog对象，最后调用show方法显示出来，当然你也可以像这样直接new 一个AlertDialog对象
var b = new AlertDialog.Builder(this);
设置一个setCancelable (true|false)看看有没有什么区别
3.通过Builder的setView()定制显示的AlertDialog
我们可以自定义一个与系统对话框不同的布局，然后调用setView()将我们的布局加载到AlertDialog上，上面我们来实现这个效果：
我就贴一下几个主要的布局和样式文件
1.对话框头部的取消按钮样式：在drawable文件下创建一个btn_selector_exit.xml文件，在这里要注意一点item下的属性android:background=“#dedede”,这样直接写会报错，我这里用的是换颜色，所以我在string.xml文件下写了两个颜色，大家要注意一下，我有点想不通的是为什么background属性直接写颜色代码会出错，有点郁闷，如果你有好的解释也可以告诉我这个android的 菜鸟
<drawable name="pressed_color">#0cb026</drawable>
<drawable name="default_color">#53cc66</drawable>
-
<?xml version="1.0" encoding="utf-8" ?>
-
<selector xmlns:android="http://schemas.android.com/apk/res/android">
-
<item android:state_pressed="true" android:drawable="@drawable/exit_press"/>
-
<item android:drawable="@drawable/exit"/>
-
</selector>
2.底部两个按钮按下换背景色的样式新建一个btn_selector_choose.xml文件
-
<?xml version="1.0" encoding="utf-8" ?>
-
<selector xmlns:android="http://schemas.android.com/apk/res/android">
-
<item android:state_pressed="true" android:drawable="@drawable/pressed_color" />
-
<item android:drawable="@drawable/default_color" />
-
</selector>
3.最重要的还是<?xml version="1.0" encoding="utf-8"?>
-
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-
android:id=
"@+id/layout_relative"
-
android:layout_width=
"match_parent"
-
android:layout_height=
"match_parent">
-
<!--头部-->
-
<RelativeLayout
-
android:id=
"@+id/layout_title"
-
android:layout_width=
"match_parent"
-
android:layout_height=
"wrap_content"
-
android:layout_alignParentLeft=
"true"
-
android:layout_alignParentTop=
"true"
-
android:background=
"#53cc66"
-
android:padding=
"5dp">
-
<TextView
-
android:layout_width=
"match_parent"
-
android:layout_height=
"wrap_content"
-
android:layout_centerVertical=
"true"
-
android:text=
"提示文本"
-
android:textSize=
"18sp"
-
android:textStyle=
"bold"
-
android:textColor=
"#ffffff"
-
/>
-
<Button
-
android:id=
"@+id/btn_cancel"
-
android:layout_width=
"30dp"
-
android:layout_height=
"30dp"
-
android:layout_alignParentRight=
"true"
-
android:background=
"@drawable/btn_selector_exit" />
-
</RelativeLayout>
-
<!--中间内容-->
-
<LinearLayout
-
android:id=
"@+id/layout_detail"
-
android:layout_height=
"wrap_content"
-
android:layout_width=
"match_parent"
-
android:layout_below=
"@+id/layout_title"
-
android:layout_centerInParent=
"true"
-
android:orientation=
"vertical"
-
android:background=
"#f1f1f1"
-
android:padding=
"20dp"
-
>
-
<TextView
-
android:layout_width=
"wrap_content"
-
android:layout_height=
"wrap_content"
-
android:text=
"通过setView方法定制alertDialog"
-
android:textColor=
"#04AEDA"
-
android:textSize=
"18sp" />
-
<TextView
-
android:layout_width=
"wrap_content"
-
android:layout_height=
"wrap_content"
-
android:text=
"作者：张林"
-
android:textColor=
"#04AEDA"
-
android:textSize=
"18sp" />
-
</LinearLayout>
-
<!--底部按钮-->
-
<LinearLayout
-
android:layout_width=
"match_parent"
-
android:layout_height=
"wrap_content"
-
android:layout_below=
"@+id/layout_detail"
-
android:orientation=
"horizontal"
-
android:background=
"#f1f1f1"
-
android:padding=
"5dp"
-
>
-
<Button
-
android:id=
"@+id/btn_blog"
-
android:layout_width=
"match_parent"
-
android:layout_height=
"40dp"
-
android:layout_weight=
"1"
-
android:background=
"@drawable/btn_selector_choose"
-
android:text=
"访问博客"
-
android:textColor=
"#ffffff"
-
android:textSize=
"20sp"
-
android:layout_marginRight=
"5dp"
-
/>
-
-
<Button
-
android:id=
"@+id/btn_close"
-
android:layout_width=
"match_parent"
-
android:layout_height=
"40dp"
-
android:layout_weight=
"1"
-
android:background=
"@drawable/btn_selector_choose"
-
android:text=
"关闭对话框"
-
android:textColor=
"#ffffff"
-
android:textSize=
"20sp" />
-
-
</LinearLayout>
-
</RelativeLayout>
mainactivity代码，这个布局我就不贴了。
-
public
class MainActivity : Activity
-
{
-
private AlertDialog alertDialog =
null;
-
private AlertDialog.Builder builder =
null;
-
private Button btn_show =
null;
-
protected
override void OnCreate(Bundle bundle)
-
{
-
base.OnCreate(bundle);
-
SetContentView(Resource.Layout.Main);
-
bindViewClick();
-
builder = new AlertDialog.Builder(
this);
-
-
LayoutInflater layoutInflater = LayoutInflater.From(
this);
-
var view_customer = layoutInflater.Inflate(Resource.Layout.view_dialog_custom,
null,
false);
-
-
builder.SetView(view_customer);
-
builder.SetCancelable(
false);
-
alertDialog = builder.Create();
-
view_customer.FindViewById(Resource.Id.btn_cancel).Click += (s, e) =>
-
{
-
Toast.MakeText(
this,
"对话框已关闭", ToastLength.
Short).Show();
-
alertDialog.Dismiss();
-
};
-
view_customer.FindViewById(Resource.Id.btn_blog).Click += delegate
-
{
-
Toast.MakeText(
this,
"正在访问博客", ToastLength.
Short).Show();
-
Uri uri = Uri.Parse(
"http://blog.csdn.net/kebi007");
-
Intent intent = new Intent(Intent.ActionView, uri);
-
StartActivity(intent);
-
alertDialog.Dismiss();
-
};
-
view_customer.FindViewById(Resource.Id.btn_close).Click += delegate
-
{
-
Toast.MakeText(
this,
"对话框已关闭", ToastLength.
Short).Show();
-
alertDialog.Dismiss();
-
};
-
-
btn_show = FindViewById<Button>(Resource.Id.btn_show);
-
btn_show.Click += delegate { alertDialog.Show(); };
-
}
-
}
4.当然还有更高级的自定义的对话框，后面继续...........
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