如何在通知数量的操作栏中制作图标?

我想在操作栏中通知图标在通知数内。

例如( Google Adsence ):

操作栏Google Adsence

我在stackoverflow上find了这个答案,但它并没有完全回答我的问题,因为在这种情况下,它只是数字而不是一个带有数字的图标: 带有计数的操作栏通知图标

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  • 经过大量的尝试几乎所有的资源,所以我转向博客; 成功。 我想分享一下我的工作(Api> = 13)。

    让我们从代码中使用它的方式开始:

    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; } 

    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> 

    这个类可以方便地做一个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 (ie 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; } } 

    这个类有助于设置数字。

     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); } } 

    muires/drawable包含一个drawable(就像一个布局):

     <?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> 

    祝你好运!