Android 操作项上的通知徽章 [英] Notification Badge On Action Item Android

问题描述

我想在放置在操作栏中的购物车图像上添加一个通知徽章并以编程方式对其进行操作.有什么帮助吗?

I wana add a notification badge on the cart image placed in action bar and manipulate it programmatically. Any Help?

推荐答案

您可以通过创建 自定义布局 在 ActionBar 上显示自定义 MenuItem对于 MenuItem.要设置自定义布局，您必须使用菜单项属性 app:actionLayout.

You can show custom MenuItem on ActionBar by creating a custom layout for MenuItem. To set a custom layout you have to use menu item attribute app:actionLayout.

按照以下步骤在 Cart 操作项上创建 Badge.结果见附件图片.

Follow below steps to create a Badge on Cart action item. See the attached image for result.

1. 使用ImageView(用于购物车图标)和TextView(用于计数值)创建自定义布局

1. Create a custom layout with ImageView(for cart icon) and TextView(for count value)

布局/custom_action_item_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    style="?attr/actionButtonStyle"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:clipToPadding="false"
    android:focusable="true">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:src="@drawable/ic_action_cart"/>

    <TextView
        android:id="@+id/cart_badge"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_gravity="right|end|top"
        android:layout_marginEnd="-5dp"
        android:layout_marginRight="-5dp"
        android:layout_marginTop="3dp"
        android:background="@drawable/badge_background"
        android:gravity="center"
        android:padding="3dp"
        android:textColor="@android:color/white"
        android:text="0"
        android:textSize="10sp"/>

</FrameLayout>

1. 使用Shape创建可绘制的圆形badge背景.

1. Create drawable circular badge background using Shape.

drawable/badge_background.xml:

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

    <solid android:color="@android:color/holo_red_dark"/>
    <stroke android:color="@android:color/white" android:width="1dp"/>

</shape>

1. 将自定义布局添加到菜单item.

1. Add custom layout to menu item.

menu/main_menu.xml

<menu 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto" >

    <item
        android:id="@+id/action_cart"
        android:icon="@drawable/ic_action_cart"
        android:title="Cart"
        app:actionLayout="@layout/custom_action_item_layout"
        app:showAsAction="always"/>

</menu>

1. 在您的 MainActivity 中，添加以下代码:

1. In your MainActivity, add following codes:

MainActivity.java:

public class MainActivity extends AppCompatActivity {
    ................
    ......................
    TextView textCartItemCount;
    int mCartItemCount = 10;

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

        .....................
        ............................
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);

        final MenuItem menuItem = menu.findItem(R.id.action_cart);

        View actionView = menuItem.getActionView();
        textCartItemCount = (TextView) actionView.findViewById(R.id.cart_badge);

        setupBadge();

        actionView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onOptionsItemSelected(menuItem);
            }
        });

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {

            case R.id.action_cart: {
                // Do something
                return true;
            }
        }
        return super.onOptionsItemSelected(item);
    }

    private void setupBadge() {

        if (textCartItemCount != null) {
            if (mCartItemCount == 0) {
                if (textCartItemCount.getVisibility() != View.GONE) {
                    textCartItemCount.setVisibility(View.GONE);
                }
            } else {
                textCartItemCount.setText(String.valueOf(Math.min(mCartItemCount, 99)));
                if (textCartItemCount.getVisibility() != View.VISIBLE) {
                    textCartItemCount.setVisibility(View.VISIBLE);
                }
            }
        }
    }

    ..................
    ..............................

}

输出:

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