本文代码从java项目移植到.net项目 java开源项目：https://github.com/jgilfelt/android-viewbadger
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Graphics; using Java.Lang;
using Android.Util;
using Android.Content.Res;
using Android.Views.Animations;
using Android.Graphics.Drawables;
using Android.Graphics.Drawables.Shapes;
using static Android.Resource;
using static Android.App.ActionBar; namespace Dorid.UI
{
public class BadgeView : TextView
{
public const int POSITION_TOP_LEFT = ;
public const int POSITION_TOP_RIGHT = ;
public const int POSITION_BOTTOM_LEFT = ;
public const int POSITION_BOTTOM_RIGHT = ;
public const int POSITION_CENTER = ; private const int DEFAULT_MARGIN_DIP = ;
private const int DEFAULT_LR_PADDING_DIP = ;
private const int DEFAULT_CORNER_RADIUS_DIP = ;
private const int DEFAULT_POSITION = POSITION_TOP_RIGHT;
private static Android.Graphics.Color DEFAULT_BADGE_COLOR = Android.Graphics.Color.ParseColor("#CCFF0000"); //Color.RED;
private static Android.Graphics.Color DEFAULT_TEXT_COLOR = Android.Graphics.Color.White; private static Android.Views.Animations.Animation fadeIn;
private static Android.Views.Animations.Animation fadeOut; private Context context;
private View target; private int badgePosition;
private int badgeMarginH;
private int badgeMarginV;
private Android.Graphics.Color badgeColor; private bool isShown; private ShapeDrawable badgeBg; private int targetTabIndex; public BadgeView(Context context):this(context,(IAttributeSet)null, Android.Resource.Attribute.TextViewStyle)
{ } public BadgeView(Context context, IAttributeSet attrs) : this(context, attrs, Android.Resource.Attribute.TextViewStyle)
{ } /**
* Constructor -
*
* create a new BadgeView instance attached to a target {@link android.view.View}.
*
* @param context context for this view.
* @param target the View to attach the badge to.
*/
public BadgeView(Context context, View target) : this(context,null, Android.Resource.Attribute.TextViewStyle,target,)
{ } /**
* Constructor -
*
* create a new BadgeView instance attached to a target {@link android.widget.TabWidget}
* tab at a given index.
*
* @param context context for this view.
* @param target the TabWidget to attach the badge to.
* @param index the position of the tab within the target.
*/
public BadgeView(Context context, TabWidget target, int index):this(context,null, Android.Resource.Attribute.TextViewStyle,target,index)
{ } public BadgeView(Context context, IAttributeSet attrs, int defStyle):this(context,attrs,defStyle,null,)
{ } public BadgeView(Context context, IAttributeSet attrs, int defStyle, View target, int tabIndex):base(context,attrs,defStyle)
{
init(context, target, tabIndex);
} private void init(Context context, View target, int tabIndex)
{ this.context = context;
this.target = target;
this.targetTabIndex = tabIndex; // apply defaults
badgePosition = DEFAULT_POSITION;
badgeMarginH = DipToPixels(DEFAULT_MARGIN_DIP);
badgeMarginV = badgeMarginH;
badgeColor = DEFAULT_BADGE_COLOR; Typeface = Typeface.DefaultBold;
int paddingPixels = DipToPixels(DEFAULT_LR_PADDING_DIP); SetPadding(paddingPixels, , paddingPixels, );
SetTextColor(DEFAULT_TEXT_COLOR); fadeIn = new AlphaAnimation(, );
fadeIn.Interpolator = new DecelerateInterpolator();
fadeIn.Duration = ; fadeOut = new AlphaAnimation(, );
fadeOut.Interpolator = new DecelerateInterpolator();
fadeOut.Duration = ; isShown = false; if (this.target != null)
{
ApplyTo(this.target);
}
else
{
Show();
} } private void ApplyTo(View target)
{ ViewGroup.LayoutParams lp = target.LayoutParameters;
IViewParent parent = target.Parent;
FrameLayout container = new FrameLayout(context); if (target is TabWidget) { // set target to the relevant tab child container
target = ((TabWidget)target).GetChildTabViewAt(targetTabIndex);
this.target = target; ((ViewGroup)target).AddView(container,
new LayoutParams(LayoutParams.FillParent, LayoutParams.FillParent)); this.Visibility= ViewStates.Gone;
container.AddView(this); } else { // TODO verify that parent is indeed a ViewGroup
ViewGroup group = (ViewGroup)parent;
int index = group.IndexOfChild(target); group.RemoveView(target);
group.AddView(container, index, lp); container.AddView(target); this.Visibility= ViewStates.Gone;
container.AddView(this); group.Invalidate(); } } /**
* Make the badge visible in the UI.
*
*/
public void Show()
{
Show(false, null);
} /**
* Make the badge visible in the UI.
*
* @param animate flag to apply the default fade-in animation.
*/
public void Show(bool animate)
{
Show(animate, fadeIn);
} /**
* Make the badge visible in the UI.
*
* @param anim Animation to apply to the view when made visible.
*/
public void Show(Android.Views.Animations.Animation anim)
{
Show(true, anim);
} /**
* Make the badge non-visible in the UI.
*
*/
public void Hide()
{
Hide(false, null);
} /**
* Make the badge non-visible in the UI.
*
* @param animate flag to apply the default fade-out animation.
*/
public void Hide(bool animate)
{
Hide(animate, fadeOut);
} /**
* Make the badge non-visible in the UI.
*
* @param anim Animation to apply to the view when made non-visible.
*/
public void Hide(Android.Views.Animations.Animation anim)
{
Hide(true, anim);
} /**
* Toggle the badge visibility in the UI.
*
*/
public void Toggle()
{
Toggle(false, null, null);
} /**
* Toggle the badge visibility in the UI.
*
* @param animate flag to apply the default fade-in/out animation.
*/
public void Toggle(bool animate)
{
Toggle(animate, fadeIn, fadeOut);
} /**
* Toggle the badge visibility in the UI.
*
* @param animIn Animation to apply to the view when made visible.
* @param animOut Animation to apply to the view when made non-visible.
*/
public void Toggle(Android.Views.Animations.Animation animIn, Android.Views.Animations.Animation animOut)
{
Toggle(true, animIn, animOut);
} private void Show(bool animate, Android.Views.Animations.Animation anim)
{ if (Background == null)
{
if (badgeBg == null)
{
badgeBg = getDefaultBackground();
} SetBackgroundDrawable(badgeBg);
}
ApplyLayoutParams(); if (animate)
{
this.StartAnimation(anim);
}
this.Visibility = ViewStates.Visible;
isShown = true;
} private void Hide(bool animate, Android.Views.Animations.Animation anim)
{
this.Visibility = ViewStates.Gone;
if (animate)
{
this.StartAnimation(anim);
}
isShown = false;
} private void Toggle(bool animate, Android.Views.Animations.Animation animIn, Android.Views.Animations.Animation animOut)
{
if (isShown)
{
Hide(animate && (animOut != null), animOut);
}
else
{
Show(animate && (animIn != null), animIn);
}
} /**
* Increment the numeric badge label. If the current badge label cannot be converted to
* an integer value, its label will be set to "0".
*
* @param offset the increment offset.
*/
public int Increment(int offset)
{
var txt = Text;
int i;
if (txt != null)
{
try
{
i = Convert.ToInt32(txt.ToString());
}
catch (NumberFormatException e)
{
i = ;
}
}
else
{
i = ;
}
i = i + offset;
//Text = String.ValueOf(i); return i;
} /**
* Decrement the numeric badge label. If the current badge label cannot be converted to
* an integer value, its label will be set to "0".
*
* @param offset the decrement offset.
*/
public int Decrement(int offset)
{
return Increment(-offset);
} private ShapeDrawable getDefaultBackground()
{ int r = DipToPixels(DEFAULT_CORNER_RADIUS_DIP);
float[] outerR = new float[] { r, r, r, r, r, r, r, r }; RoundRectShape rr = new RoundRectShape(outerR, null, null);
ShapeDrawable drawable = new ShapeDrawable(rr);
drawable.Paint.Color = badgeColor; return drawable; } private void ApplyLayoutParams()
{ FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.WrapContent, LayoutParams.WrapContent); switch (badgePosition)
{
case POSITION_TOP_LEFT:
lp.Gravity = GravityFlags.Left | GravityFlags.Top;
lp.SetMargins(badgeMarginH, badgeMarginV, , );
break;
case POSITION_TOP_RIGHT:
lp.Gravity = GravityFlags.Right | GravityFlags.Top;
lp.SetMargins(, badgeMarginV, badgeMarginH, );
break;
case POSITION_BOTTOM_LEFT:
lp.Gravity = GravityFlags.Left | GravityFlags.Bottom;
lp.SetMargins(badgeMarginH, , , badgeMarginV);
break;
case POSITION_BOTTOM_RIGHT:
lp.Gravity = GravityFlags.Right | GravityFlags.Bottom;
lp.SetMargins(, , badgeMarginH, badgeMarginV);
break;
case POSITION_CENTER:
lp.Gravity = GravityFlags.Center;
lp.SetMargins(, , , );
break;
default:
break;
} LayoutParameters = lp;
} /**
* Returns the target View this badge has been attached to.
*
*/
public View GetTarget()
{
return target;
} /**
* Is this badge currently visible in the UI?
*
*/
public override bool IsShown
{
get
{
return isShown;
}
} /**
* Returns the positioning of this badge.
*
* one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.
*
*/
public int getBadgePosition()
{
return badgePosition;
} /**
* Set the positioning of this badge.
*
* @param layoutPosition one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.
*
*/
public void setBadgePosition(int layoutPosition)
{
this.badgePosition = layoutPosition;
} /**
* Returns the horizontal margin from the target View that is applied to this badge.
*
*/
public int getHorizontalBadgeMargin()
{
return badgeMarginH;
} /**
* Returns the vertical margin from the target View that is applied to this badge.
*
*/
public int getVerticalBadgeMargin()
{
return badgeMarginV;
} /**
* Set the horizontal/vertical margin from the target View that is applied to this badge.
*
* @param badgeMargin the margin in pixels.
*/
public void setBadgeMargin(int badgeMargin)
{
this.badgeMarginH = badgeMargin;
this.badgeMarginV = badgeMargin;
} /**
* Set the horizontal/vertical margin from the target View that is applied to this badge.
*
* @param horizontal margin in pixels.
* @param vertical margin in pixels.
*/
public void setBadgeMargin(int horizontal, int vertical)
{
this.badgeMarginH = horizontal;
this.badgeMarginV = vertical;
} /**
* Returns the color value of the badge background.
*
*/
public int getBadgeBackgroundColor()
{
return badgeColor;
} /**
* Set the color value of the badge background.
*
* @param badgeColor the badge background color.
*/
public void setBadgeBackgroundColor(Android.Graphics.Color badgeColor)
{
this.badgeColor = badgeColor;
badgeBg = getDefaultBackground();
} private int DipToPixels(int dip)
{
Resources r =Resources;
float px = TypedValue.ApplyDimension(ComplexUnitType.Dip, dip, r.DisplayMetrics);
return (int)px;
}
}
}
使用方法：
[Activity(Label = "BadgeActivity", MainLauncher = true)]
public class BadgeActivity : Activity
{
private ZsCMS.Dorid.UI.BadgeView bv;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.Badge); View buttion= FindViewById(Resource.Id.button1);
bv = new UI.BadgeView(this, buttion);
bv.Text = "";
bv.Show(); buttion.Click += Buttion_Click;
// Create your application here
} private int i = ;
private void Buttion_Click(object sender, EventArgs e)
{
bv.Text = (++i).ToString();
}
}