Question

我想在应用中通知用户有关新的未读消息，可通过导航栏进行访问。我正在考虑类似Apple的通知徽章，但工具栏中的抽屉切换。

这就是我现在拥有的：

这就是我想要的：

我怎样才能做到这一点？

Answer 1

我在互联网上发现了这个非常酷的BadgeDrawable类，您可以使用此类为任何drawable添加徽章计数。请按照以下步骤操作。

第1步：首先在课程中添加以下课程。

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.util.TypedValue;


/**
 * Created by Admin on 2/25/2016.
 */
public class BadgeDrawable extends Drawable {

    private float mTextSize;
    private Paint mBadgePaint;
    private Paint mBadgePaint1;
    private Paint mTextPaint;
    private Rect mTxtRect = new Rect();

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


    public BadgeDrawable(Context context) {
        mTextSize = dpToPx(context, 8); //text size
        mBadgePaint = new Paint();
        mBadgePaint.setColor(Color.RED);
        mBadgePaint.setAntiAlias(true);
        mBadgePaint.setStyle(Paint.Style.FILL);
        mBadgePaint1 = new Paint();
        mBadgePaint1.setColor(Color.parseColor("#EEEEEE"));
        mBadgePaint1.setAntiAlias(true);
        mBadgePaint1.setStyle(Paint.Style.FILL);

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

    private float dpToPx(Context context, float value) {
        Resources r = context.getResources();
        float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, r.getDisplayMetrics());
        return px;
    }


    @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.

  /*Using Math.max rather than Math.min */
//        float radius = ((Math.max(width, height) / 2)) / 2;
        float radius = width * 0.15f;
        float centerX = (width - radius - 1) +10;
        float centerY = radius -5;
        if(mCount.length() <= 2){
            // Draw badge circle.
            canvas.drawCircle(centerX, centerY, radius+9, mBadgePaint1);
            canvas.drawCircle(centerX, centerY, radius+7, mBadgePaint);
        }
        else{
            canvas.drawCircle(centerX, centerY, radius+10, mBadgePaint1);
            canvas.drawCircle(centerX, centerY, radius+8, 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);
        if(mCount.length() > 2)
        canvas.drawText("99+", centerX, textY, mTextPaint);
        else
        canvas.drawText(mCount, centerX, textY, mTextPaint);
    }

    /*
     Sets the count (i.e notifications) to display.
      */
    public void setCount(String count) {
        mCount = count;
        // Only draw a badge if there are notifications.
        mWillDraw = !count.equalsIgnoreCase("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;
    }
}

步骤2：现在创建一个drawable（在我的例子中是ic_badge_drawable.xml）。然后复制并粘贴到xml文本下面。

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@+id/ic_main_icon"
        android:drawable="@drawable/ic_burger"
        android:gravity="center" />


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

现在你可以传递任何drawable，稍后我们可以将任何drawable传递给那些。这些就像占位符一样。

第3步：我们已经设置了所有内容。现在，您可以使用以下方法为任何drawable设置徽章计数。

 private Drawable setBadgeCount(Context context, int res, int badgeCount){
        LayerDrawable icon = (LayerDrawable) ContextCompat.getDrawable(context, R.drawable.ic_badge_drawable);
        Drawable mainIcon = ContextCompat.getDrawable(context, res);
        BadgeDrawable badge = new BadgeDrawable(context);
        badge.setCount(String.valueOf(badgeCount));
        icon.mutate();
        icon.setDrawableByLayerId(R.id.ic_badge, badge);
        icon.setDrawableByLayerId(R.id.ic_main_icon, mainIcon);

        return icon;
    }

第4步：我用它来改变我的默认汉堡图标。

setSupportActionBar(toolbar);
getSupportActionBar().setHomeAsUpIndicator(setBadgeCount(this,R.drawable.ic_burger, 3));
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowCustomEnabled(true);   // enable overriding the default toolbar layout
getSupportActionBar().setDisplayShowTitleEnabled(false);// disable the default title element here (for centered title)

Answer 2

我在android.support.design.widget.AppBarLayout中使用了简单的TextView，请查看下面的完整代码

MainActivity.java

import android.os.Bundle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

     private DrawerLayout mDrawerLayout;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         initViews();
     }

     private void initViews() {
         mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
         setUpToolbar();
     }

     private void setUpToolbar() {
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
         final ActionBar ab = getSupportActionBar();
         ab.setHomeAsUpIndicator(R.drawable.navigation_drawericon);
         ab.setDisplayHomeAsUpEnabled(true);
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.home_menu, menu);
         return true;
     }

     @Override
     public boolean onOptionsItemSelected(android.view.MenuItem item) {
         switch (item.getItemId()) {
             case android.R.id.home:
                 mDrawerLayout.openDrawer(GravityCompat.START);
                 return true;
         }
         return super.onOptionsItemSelected(item);
     }

     private void updateCounter(int count) {
         ((TextView) findViewById(R.id.tv_nav_drawer_count)).setText(count + "");
     }

     public void closeDrawer() {
         mDrawerLayout.closeDrawers();
     }
  }

activity_main.xml中

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v4.widget.DrawerLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/white"
        android:fitsSystemWindows="true">

        <include layout="@layout/container_layout"/>

        <android.support.design.widget.NavigationView
            android:id="@+id/navigation_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:fitsSystemWindows="true">

        </android.support.design.widget.NavigationView>


    </android.support.v4.widget.DrawerLayout>

container_layout.xml

<android.support.design.widget.CoordinatorLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            android:id="@+id/main_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <android.support.design.widget.AppBarLayout
                android:id="@+id/appbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

                <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    android:background="?attr/colorPrimary"
                    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>


                <TextView
                    android:id="@+id/tv_nav_drawer_count"
                    android:layout_width="15dp"
                    android:layout_height="15dp"
                    android:layout_marginLeft="30dp"
                    android:layout_marginTop="-45dp"
                    android:background="@drawable/menu_text_bg"
                    android:gravity="center"
                    android:text="10"
                    android:textColor="@android:color/white"
                    android:textSize="8dp"/>


            </android.support.design.widget.AppBarLayout>

            <FrameLayout
                android:id="@+id/home_frame_container"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="?actionBarSize"/>


        </android.support.design.widget.CoordinatorLayout>

home_menu.xml

     <?xml version="1.0" encoding="utf-8"?>
        <menu xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto">

            <item
                android:id="@+id/menu_search"
                android:icon="@android:drawable/ic_menu_search"
                android:orderInCategory="101"
                android:title="Search"
                app:showAsAction="always"/>
        </menu>

menu_text_bg.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportHeight="24.0"
        android:viewportWidth="24.0">
    <path
        android:fillColor="@android:color/holo_red_dark"
        android:pathData="M12,12m-10,0a10,10 0,1 1,20 0a10,10 0,1 1,-20 0"/>
</vector>

Answer 3

我知道它迟到但仍然。如果您使用Android侧导航菜单作为入门者，则会有一个文件名 app_bar_main.xml 在此文件中，除了 TextView 之外，您还会看到一些代码， TextView 负责显示徽章，只需在 MainActivity 中初始化徽章您正在初始化工具栏，并根据您的需要更改其可见性（当计数为正数时可见，否则就会消失），因为您可以看到其可见性 消失

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.thumbsol.beakns.activities.MainActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay"></android.support.v7.widget.Toolbar>

    <TextView
        android:id="@+id/hamburger_count"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_marginLeft="30dp"
        android:layout_marginTop="-45dp"
        android:background="@drawable/red_circle_bacground"
        android:gravity="center"
        android:text="10"
        android:textColor="@android:color/white"
        android:visibility="gone" />

    </android.support.design.widget.AppBarLayout>

  <include layout="@layout/content_main" />

以下是 red_circle_bacground.xml的代码将其放入drawable中

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#f00" />
<corners
    android:bottomLeftRadius="30dp"
    android:bottomRightRadius="30dp"
    android:topLeftRadius="30dp"
    android:topRightRadius="30dp" />

  <size
    android:height="25dp"
    android:width="25dp"/>
</shape>

Answer 4

根据TDSoft的回答，您可以通过扩展DrawerArrowDrawable进一步缩短程序。

第1步:(除了DrawerArrowDrable，基本上与TDSoft的徽章类相同）。

public class BadgeNavigationDrawable extends DrawerArrowDrawable{

private float mTextSize;
private Paint mBadgePaint;
private Paint mBadgePaint1;
private Paint mTextPaint;
private Rect mTxtRect = new Rect();

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



/**
 * @param context used to get the configuration for the drawable from
 */
public BadgeNavigationDrawable(Context context) {
    super(context);

    setColor(context.getResources().getColor(R.color.accent));

    mTextSize = dpToPx(context, 8); //text size
    mBadgePaint = new Paint();
    mBadgePaint.setColor(Color.RED);
    mBadgePaint.setAntiAlias(true);
    mBadgePaint.setStyle(Paint.Style.FILL);
    mBadgePaint1 = new Paint();
    mBadgePaint1.setColor(Color.parseColor("#EEEEEE"));
    mBadgePaint1.setAntiAlias(true);
    mBadgePaint1.setStyle(Paint.Style.FILL);

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

}

@Override
public void draw(Canvas canvas) {
    super.draw(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.
/*Using Math.max rather than Math.min */
//  float radius = ((Math.max(width, height) / 2)) / 2;
    float radius = width * 0.15f;
    float centerX = (width - radius - 1) +10;
    float centerY = radius -5;
    if(mCount.length() <= 2){
        // Draw badge circle.
        canvas.drawCircle(centerX, centerY, radius+9, mBadgePaint1);
        canvas.drawCircle(centerX, centerY, radius+7, mBadgePaint);
    }
    else{
        canvas.drawCircle(centerX, centerY, radius+10, mBadgePaint1);
        canvas.drawCircle(centerX, centerY, radius+8, 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);
    if(mCount.length() > 2)
        canvas.drawText("99+", centerX, textY, mTextPaint);
    else
        canvas.drawText(mCount, centerX, textY, mTextPaint);
}

/*
 Sets the count (i.e notifications) to display.
  */
public void setCount(String count) {
    mCount = count;
    // Only draw a badge if there are notifications.
    mWillDraw = !count.equalsIgnoreCase("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;
}
private float dpToPx(Context context, float value) {
    Resources r = context.getResources();
    float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, r.getDisplayMetrics());
    return px;
}

}

第2步：这就是您所需要的，如果您需要更新导航抽屉图标，请致电 - 您的活动全部保留。

BadgeNavigationDrawable drawerIcon = new BadgeNavigationDrawable(MainActivity.this);
drawerIcon.setCount(String.valueOf(count));

mDrawerToggle.setDrawerArrowDrawable(drawerIcon);
                    mDrawerToggle.syncState();

Answer 5

我通过在我的主要布局中添加TextView并定位切换来实现此目的。在我的mainactivity.xml中，我添加了这个

 <RelativeLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/badge_ham"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="26dp"
        android:layout_marginTop="14dp"
        android:textSize="9sp" />
</RelativeLayout>

并添加徽章：

private  void addBadgeToHamburger(int badge){
    badge_ham.setVisibility(View.VISIBLE);
    String counter = Integer.toString(badge);
    String s =  "   " + counter + " ";
    SpannableString sColored = new SpannableString(s);

    sColored.setSpan(new RoundedBackgroundSpan(Color.RED, Color.WHITE), s.length() - 3, s.length(), 0);
    badge_ham.setText(sColored);
}

工具栏中抽屉切换的徽章通知 - Android

5 个答案: