我想使操作栏中的通知图标以通知的数量内。

例如（谷歌Adsence ）：

我发现计算器这个答案，但它不能完全回答我的问题，因为在这种情况下，它是唯一的号码，与一些没有图标：的与数 解决方案

很多，所以我转向了博客尝试了几乎所有的资源后，成功地。我想分享什么工作对我来说（API> = 13）; 源。

让我们先从甜code，的方式使用它

 公共布尔onCreateOptionsMenu（功能菜单）{
    //膨胀菜单
    。getMenuInflater（）膨胀（R.menu.menu_my，菜单）;

    //获取通知的菜单项和LayerDrawable（层列表）
    菜单项项= menu.findItem（R.id.action_notifications）;
    LayerDrawable图标=（LayerDrawable）item.getIcon（）;

    //更新LayerDrawable的BadgeDrawable
    Utils2.setBadgeCount（这一点，图标，2）;

    返回true;
}
 

在 menu_my.xml ：

 ＆LT;菜单的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：程序=htt​​p://schemas.android.com/apk/res-auto
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    工具：上下文=MainActivity。＆GT;
    ＆LT;项目
        机器人：ID =@ + ID / action_notifications
        机器人：图标=@可绘制/ ic_menu_notifications
        机器人：标题=通知
        应用程序：showAsAction =总是/＆GT;
＆LT; /菜单＆gt;
 

本类方便地使 BadgeDrawable ：

 公共类BadgeDrawable扩展绘制对象{

    私人浮动mTextSize;
    私人油漆mBadgePaint;
    私人油漆mTextPaint;
    私人矩形mTxtRect =新的矩形（）;

    私人字符串mCount =;
    私人布尔mWillDraw = FALSE;

    公共BadgeDrawable（上下文的背景下）{
        // mTextSize = context.getResources（）getDimension（R.dimen.badge_text_size）。
        mTextSize = 12F;

        mBadgePaint =新的油漆（）;
        mBadgePaint.setColor（Color.RED）;
        mBadgePaint.setAntiAlias​​（真正的）;
        mBadgePaint.setStyle（Paint.Style.FILL）;

        mTextPaint =新的油漆（）;
        mTextPaint.setColor（Color.WHITE）;
        mTextPaint.setTypeface（Typeface.DEFAULT_BOLD）;
        mTextPaint.setTextSize（mTextSize）;
        mTextPaint.setAntiAlias​​（真正的）;
        mTextPaint.setTextAlign（Paint.Align.CENTER）;
    }

    @覆盖
    公共无效画（油画画布）{
        如果（！mWillDraw）{
            返回;
        }

        矩形边界的getBounds =（）;
        浮动宽度= bounds.right  -  bounds.left;
        浮动高度= bounds.bottom  -  bounds.top;

        //位置在图标的右上象限的徽章。
        浮半径=（（Math.min（宽度，高度）/ 2） -  1）/ 2;
        浮动的centerX =宽度 - 半径 -  1;
        浮centerY =半径+ 1;

        //绘制徽章圈。
        canvas.drawCircle（的centerX，centerY，半径，mBadgePaint）;

        //画出圆圈内的徽章数量的文本。
        mTextPaint.getTextBounds（mCount，0，mCount.length（），mTxtRect）;
        浮textHeight不同= mTxtRect.bottom  -  mTxtRect.top;
        浮textY处= centerY +（textHeight不同/ 2F）;
        canvas.drawText（mCount，的centerX，textY处，mTextPaint）;
    }

    / *
    设置数（即通知）来显示。
     * /
    公共无效setCount（诠释计数）{
        mCount = Integer.toString（计数）;

        //只画一个徽章，如果有通知。
        mWillDraw =计数＆GT; 0;
        invalidateSelf（）;
    }

    @覆盖
    公共无效setAlpha（INT阿尔法）{
        // 没做什么
    }

    @覆盖
    公共无效setColorFilter（ColorFilter CF）{
        // 没做什么
    }

    @覆盖
    公众诠释getOpacity（）{
        返回PixelFormat.UNKNOWN;
    }
}
 

这个类可以帮助设定数值。

 公共类Utils2 {
    公共静态无效setBadgeCount（上下文的背景下，LayerDrawable图标，诠释计数）{

        BadgeDrawable徽章;

        //重用绘制如果可能的话
        绘制对象重用= icon.findDrawableByLayerId（R.id.ic_badge）;
        如果（再利用= NULL和放大器;！＆安培;重新使用的instanceof BadgeDrawable）{
            徽章=（BadgeDrawable）重用;
        } 其他 {
            徽章=新BadgeDrawable（上下文）;
        }

        badge.setCount（计数）;
        icon.mutate（）;
        icon.setDrawableByLayerId（R.id.ic_badge，徽章）;
    }


}
 

和 MUI重要提示的被拉伸（如布局）在 RES /绘制：

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;层列表的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android＆GT;
    ＆LT;项目
        机器人：ID =@ + ID / ic_notification
        机器人：可绘制=@可绘制/ ice_skate
        机器人：重力=中心/＆GT;

    ！＆LT;  - 设置一个占位符，可绘制因此Android：绘制不为空 - ＆GT;
    ＆LT;项目
        机器人：ID =@ + ID / ic_badge
        机器人：可绘制=@可绘制/ ice_skate/＆GT;
＆LT; /层列表＆gt;
 

好卢克斯！

I would like to make a notification icon in the action bar to inside the number of notifications.

For example (Google Adsence) :

I found this answer on stackoverflow, but it does not fully answer my question because in this case it is only the number and not an icon with a number: Actionbar notification icon with count

After a lot of trying of nearly all resources on SO I turned to blogs; succesfully. I want to share what worked for me (Api >= 13); source.

Let's start with the sweet code, the way it's used:

 public boolean onCreateOptionsMenu(Menu menu) {
    //inflate menu
    getMenuInflater().inflate(R.menu.menu_my, menu);

    // Get the notifications MenuItem and LayerDrawable (layer-list)
    MenuItem item = menu.findItem(R.id.action_notifications);
    LayerDrawable icon = (LayerDrawable) item.getIcon();

    // Update LayerDrawable's BadgeDrawable
    Utils2.setBadgeCount(this, icon, 2);

    return true;
}

The menu_my.xml:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity">
    <item
        android:id="@+id/action_notifications"
        android:icon="@drawable/ic_menu_notifications"
        android:title="Notifications"
        app:showAsAction="always" />
</menu>

This class that conveniently makes a BadgeDrawable:

public class BadgeDrawable extends Drawable {

    private float mTextSize;
    private Paint mBadgePaint;
    private Paint mTextPaint;
    private Rect mTxtRect = new Rect();

    private String mCount = "";
    private boolean mWillDraw = false;

    public BadgeDrawable(Context context) {
        //mTextSize = context.getResources().getDimension(R.dimen.badge_text_size);
        mTextSize = 12F;

        mBadgePaint = new Paint();
        mBadgePaint.setColor(Color.RED);
        mBadgePaint.setAntiAlias(true);
        mBadgePaint.setStyle(Paint.Style.FILL);

        mTextPaint = new Paint();
        mTextPaint.setColor(Color.WHITE);
        mTextPaint.setTypeface(Typeface.DEFAULT_BOLD);
        mTextPaint.setTextSize(mTextSize);
        mTextPaint.setAntiAlias(true);
        mTextPaint.setTextAlign(Paint.Align.CENTER);
    }

    @Override
    public void draw(Canvas canvas) {
        if (!mWillDraw) {
            return;
        }

        Rect bounds = getBounds();
        float width = bounds.right - bounds.left;
        float height = bounds.bottom - bounds.top;

        // Position the badge in the top-right quadrant of the icon.
        float radius = ((Math.min(width, height) / 2) - 1) / 2;
        float centerX = width - radius - 1;
        float centerY = radius + 1;

        // Draw badge circle.
        canvas.drawCircle(centerX, centerY, radius, mBadgePaint);

        // Draw badge count text inside the circle.
        mTextPaint.getTextBounds(mCount, 0, mCount.length(), mTxtRect);
        float textHeight = mTxtRect.bottom - mTxtRect.top;
        float textY = centerY + (textHeight / 2f);
        canvas.drawText(mCount, centerX, textY, mTextPaint);
    }

    /*
    Sets the count (i.e notifications) to display.
     */
    public void setCount(int count) {
        mCount = Integer.toString(count);

        // Only draw a badge if there are notifications.
        mWillDraw = count > 0;
        invalidateSelf();
    }

    @Override
    public void setAlpha(int alpha) {
        // do nothing
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        // do nothing
    }

    @Override
    public int getOpacity() {
        return PixelFormat.UNKNOWN;
    }
}

This class that helps to set the number.

public class Utils2 {
    public static void setBadgeCount(Context context, LayerDrawable icon, int count) {

        BadgeDrawable badge;

        // Reuse drawable if possible
        Drawable reuse = icon.findDrawableByLayerId(R.id.ic_badge);
        if (reuse != null && reuse instanceof BadgeDrawable) {
            badge = (BadgeDrawable) reuse;
        } else {
            badge = new BadgeDrawable(context);
        }

        badge.setCount(count);
        icon.mutate();
        icon.setDrawableByLayerId(R.id.ic_badge, badge);
    }


}

And mui importante a drawable (like a layout) in res/drawable:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/ic_notification"
        android:drawable="@drawable/ice_skate"
        android:gravity="center" />

    <!-- set a place holder Drawable so android:drawable isn't null -->
    <item
        android:id="@+id/ic_badge"
        android:drawable="@drawable/ice_skate" />
</layer-list>

Good lucks!