flutter添加角标（Android应用）

因为iOS可以直接在推送的时候后台设置角标，Android不行，所以在flutter里，设置角标还得在Android中，要不适配不了太多机型，我的思路就是在flutter中获取角标显示数量，然后在通过flutter传值到Android原生，在原生里去设置角标

首先在Android中创建一个角标的工具类

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.AsyncQueryHandler;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.text.TextUtils;
import android.util.Log;

import androidx.core.app.NotificationCompat;

import com.creaunion.cxxz.R;
import com.example.flutter_app.MainActivity;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;


public class AppShortCutUtil {
    public static int notificationId ;

    public static boolean setCount(final int count, final Context context) {
        if (count >= 0 && context != null) {
            Log.d("BRAND", Build.BRAND);
            switch (Build.BRAND.toLowerCase()) {
                case "xiaomi":
                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            setNotificationBadge(count, context);
                        }
                    }, 3000);
                    return true;
                case "huawei":
                    return setHuaweiBadge(count, context);
                case "honor":
                    return setHonorBadge(count, context);
                case "samsung":
                    return setSamsungBadge(count, context);
                case "oppo":
                    return setOPPOBadge(count, context) || setOPPOBadge2(count, context);
                case "vivo":
                    return setVivoBadge(count, context);
                case "lenovo":
                    return setZukBadge(count, context);
                case "htc":
                    return setHTCBadge(count, context);
                case "sony":
                    return setSonyBadge(count, context);
                default:
                    return setNotificationBadge(count, context);
            }
        } else {
            return false;
        }
    }

    public static boolean setNotificationBadge(int count, Context context) {
        NotificationManager notificationManager = (NotificationManager) context.getSystemService
                (Context.NOTIFICATION_SERVICE);
        if (notificationManager == null) {
            return false;
        }
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            // 8.0之后添加角标需要NotificationChannel
            NotificationChannel channel = new NotificationChannel("badge", "badge",
                    NotificationManager.IMPORTANCE_DEFAULT);
            channel.setShowBadge(true);
            notificationManager.createNotificationChannel(channel);
        }
        Intent intent = new Intent(context, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
        Notification notification = new NotificationCompat.Builder(context, "badge")
                .setContentTitle("？？？")
                .setContentText("您有"+count+"条未读消息")
                .setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap
                        .ic_launcher))
                .setSmallIcon(R.mipmap.ic_launcher)
                .setAutoCancel(true)
                .setContentIntent(pendingIntent)
                .setChannelId("badge")
                .setNumber(count)
                .setBadgeIconType(NotificationCompat.BADGE_ICON_SMALL).build();


        // 小米
        if (Build.BRAND.equalsIgnoreCase("xiaomi")) {
            setXiaomiBadge(count, notification);

        }
        notificationManager.notify(notificationId, notification);

        return true;
    }

    private static void setXiaomiBadge(int count, Notification notification) {
        try {
            Field field = notification.getClass().getDeclaredField("extraNotification");
            Object extraNotification = field.get(notification);
            Method method = extraNotification.getClass().getDeclaredMethod("setMessageCount", int
                    .class);
            method.invoke(extraNotification, count);
            Log.i("wl", "setXiaomiBadge: "+count);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private static boolean setHonorBadge(int count, Context context) {
        try {
            String launchClassName = getLauncherClassName(context);
            if (TextUtils.isEmpty(launchClassName)) {
                return false;
            }
            Bundle bundle = new Bundle();
            bundle.putString("package", context.getPackageName());
            bundle.putString("class", launchClassName);
            bundle.putInt("badgenumber", count);
            context.getContentResolver().call(Uri.parse("content://com.huawei.android.launcher" +
                    ".settings/badge/"), "change_badge", null, bundle);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    private static boolean setHuaweiBadge(int count, Context context) {
        try {
            String launchClassName = getLauncherClassName(context);
            if (TextUtils.isEmpty(launchClassName)) {
                return false;
            }
            Bundle bundle = new Bundle();
            bundle.putString("package", context.getPackageName());
            bundle.putString("class", launchClassName);
            bundle.putInt("badgenumber", count);
            Log.i("wl", "setHuaweiBadge: "+count);
            context.getContentResolver().call(Uri.parse("content://com.huawei.android.launcher" + ".settings/badge/"), "change_badge", null, bundle);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    private static boolean setSamsungBadge(int count, Context context) {
        try {
            String launcherClassName = getLauncherClassName(context);
            if (TextUtils.isEmpty(launcherClassName)) {
                return false;
            }
            Intent intent = new Intent("android.intent.action.BADGE_COUNT_UPDATE");
            intent.putExtra("badge_count", count);
            intent.putExtra("badge_count_package_name", context.getPackageName());
            intent.putExtra("badge_count_class_name", launcherClassName);
            context.sendBroadcast(intent);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    @Deprecated
    private static boolean setOPPOBadge(int count, Context context) {
        try {
            Bundle extras = new Bundle();
            extras.putInt("app_badge_count", count);
            context.getContentResolver().call(Uri.parse("content://com.android.badge/badge"),
                    "setAppBadgeCount", String.valueOf(count), extras);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    @Deprecated
    private static boolean setOPPOBadge2(int count, Context context) {
        try {
            Intent intent = new Intent("com.oppo.unsettledevent");
            intent.putExtra("packageName", context.getPackageName());
            intent.putExtra("number", count);
            intent.putExtra("upgradeNumber", count);
            PackageManager packageManager = context.getPackageManager();
            List<ResolveInfo> receivers = packageManager.queryBroadcastReceivers(intent, 0);
            if (receivers != null && receivers.size() > 0) {
                context.sendBroadcast(intent);
            } else {
                Bundle extras = new Bundle();
                extras.putInt("app_badge_count", count);
                context.getContentResolver().call(Uri.parse("content://com.android.badge/badge"),
                        "setAppBadgeCount", null, extras);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    @Deprecated
    private static boolean setVivoBadge(int count, Context context) {
        try {
            String launcherClassName = getLauncherClassName(context);
            if (TextUtils.isEmpty(launcherClassName)) {
                return false;
            }
            Intent intent = new Intent("launcher.action.CHANGE_APPLICATION_NOTIFICATION_NUM");
            intent.putExtra("packageName", context.getPackageName());
            intent.putExtra("className", launcherClassName);
            intent.putExtra("notificationNum", count);
            context.sendBroadcast(intent);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    private static boolean setZukBadge(int count, Context context) {
        try {
            Bundle extra = new Bundle();
            ArrayList<String> ids = new ArrayList<>();
            // 以列表形式传递快捷方式id，可以添加多个快捷方式id
//        ids.add("custom_id_1");
//        ids.add("custom_id_2");
            extra.putStringArrayList("app_shortcut_custom_id", ids);
            extra.putInt("app_badge_count", count);
            Uri contentUri = Uri.parse("content://com.android.badge/badge");
            Bundle bundle = context.getContentResolver().call(contentUri, "setAppBadgeCount", null,
                    extra);
            return bundle != null;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    private static boolean setHTCBadge(int count, Context context) {
        try {
            ComponentName launcherComponentName = getLauncherComponentName(context);
            if (launcherComponentName == null) {
                return false;
            }

            Intent intent1 = new Intent("com.htc.launcher.action.SET_NOTIFICATION");
            intent1.putExtra("com.htc.launcher.extra.COMPONENT", launcherComponentName
                    .flattenToShortString());
            intent1.putExtra("com.htc.launcher.extra.COUNT", count);
            context.sendBroadcast(intent1);

            Intent intent2 = new Intent("com.htc.launcher.action.UPDATE_SHORTCUT");
            intent2.putExtra("packagename", launcherComponentName.getPackageName());
            intent2.putExtra("count", count);
            context.sendBroadcast(intent2);

            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    private static boolean setSonyBadge(int count, Context context) {
        String launcherClassName = getLauncherClassName(context);
        if (TextUtils.isEmpty(launcherClassName)) {
            return false;
        }
        try {
            //官方给出方法
            ContentValues contentValues = new ContentValues();
            contentValues.put("badge_count", count);
            contentValues.put("package_name", context.getPackageName());
            contentValues.put("activity_name", launcherClassName);
            SonyAsyncQueryHandler asyncQueryHandler = new SonyAsyncQueryHandler(context
                    .getContentResolver());
            asyncQueryHandler.startInsert(0, null, Uri.parse("content://com.sonymobile.home" +
                    ".resourceprovider/badge"), contentValues);
            return true;
        } catch (Exception e) {
            try {
                //网上大部分使用方法
                Intent intent = new Intent("com.sonyericsson.home.action.UPDATE_BADGE");
                intent.putExtra("com.sonyericsson.home.intent.extra.badge.SHOW_MESSAGE", count > 0);
                intent.putExtra("com.sonyericsson.home.intent.extra.badge.ACTIVITY_NAME",
                        launcherClassName);
                intent.putExtra("com.sonyericsson.home.intent.extra.badge.MESSAGE", String
                        .valueOf(count));
                intent.putExtra("com.sonyericsson.home.intent.extra.badge.PACKAGE_NAME", context
                        .getPackageName());
                context.sendBroadcast(intent);
                return true;
            } catch (Exception e1) {
                e1.printStackTrace();
                return false;
            }
        }
    }

    private static String getLauncherClassName(Context context) {
        ComponentName launchComponent = getLauncherComponentName(context);
        if (launchComponent == null) {
            return "";
        } else {
            return launchComponent.getClassName();
        }
    }

    private static ComponentName getLauncherComponentName(Context context) {
        Intent launchIntent = context.getPackageManager().getLaunchIntentForPackage(context
                .getPackageName());
        if (launchIntent != null) {
            return launchIntent.getComponent();
        } else {
            return null;
        }
    }

    static class SonyAsyncQueryHandler extends AsyncQueryHandler {

        SonyAsyncQueryHandler(ContentResolver cr) {
            super(cr);
        }
    }

}

加点权限

 <!-- 华为 -->
    <uses-permission android:name="com.huawei.android.launcher.permission.CHANGE_BADGE"/>
    <!-- OPPO -->
    <uses-permission android:name="com.oppo.launcher.permission.WRITE_SETTINGS"/>
    <!-- 联想ZUK -->
    <uses-permission android:name="android.permission.READ_APP_BADGE"/>
    <!-- HTC -->
    <uses-permission android:name="com.htc.launcher.permission.READ_SETTINGS"/>
    <uses-permission android:name="com.htc.launcher.permission.UPDATE_SHORTCUT"/>

在activity里加上下面这句话就可以显示角标了

AppShortCutUtil.setCount(10, this.applicationContext);

现在flutter里面传值到Android原生

  static final cxxz = MethodChannel("im.io.flutter");
  static Future<Null> _showbadge(int num) async {
    try {
      final result = await cxxz.invokeMethod('getbadge', {
        "badgenum": num,
      });
    } on PlatformException catch (e) {
      print("${e.message}");
    }
  }

Android接收到值设置角标

override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine)
        UmengSdkPlugin.setContext(this);
        var mMethodChannel = MethodChannel(getFlutterEngine()?.getDartExecutor()?.getBinaryMessenger(),
                CHANNEL).setMethodCallHandler { call, result ->
            if(call.method=="getbadge"){
                val arguments:Map<String, Objects> = call.arguments as Map<String, Objects>;
                val toString = arguments["badgenum"].toString();
                val toInt = toString.toInt();
                //设置角标
                AppShortCutUtil.setCount(toInt, this.applicationContext);
            }
        }
    }

这块写到Android中继承FlutterActivity的activity里
到这里你就可以发一个通知啥的去试一试角标了
补充----三星有可能手机角标会随着通知消失。