NotificationsUtils.java

package cn.hhjjj.mobpush;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;

import android.os.Build;
import android.provider.Settings;

public class NotificationsUtils {
    public static boolean isNotificationEnabled(Context context) {
        return NotificationManagerCompat.from(context.getApplicationContext()).areNotificationsEnabled();
    }

    public static void openPush(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            //这种方案适用于 API 26, 即8.0（含8.0）以上可以用
            Intent intent = new Intent();
            intent.setAction(Settings.ACTION_APP_NOTIFICATION_SETTINGS);
            intent.putExtra(Settings.EXTRA_APP_PACKAGE, activity.getPackageName());
            intent.putExtra(Settings.EXTRA_CHANNEL_ID, activity.getApplicationInfo().uid);
            activity.startActivity(intent);
        } else {
            PermissionUtil.toPermissionSetting(activity);
        }
    }
}

PermissionUtil.java

package cn.hhjjj.mobpush;

import android.net.Uri;
import android.os.Build;
import android.provider.Settings;
import android.app.Activity;
import android.content.Intent;

public class PermissionUtil {
    /**
     * 跳转到权限设置
     *
     * @param activity
     */
    public static void toPermissionSetting(Activity activity) {
        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP_MR1) {
            toSystemConfig(activity);
        } else {
            try {
                toApplicationInfo(activity);
            } catch (Exception e) {
                e.printStackTrace();
                toSystemConfig(activity);
            }
        }
    }

    /**
     * 应用信息界面
     *
     * @param activity
     */
    public static void toApplicationInfo(Activity activity) {
        Intent localIntent = new Intent();
        localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        localIntent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        localIntent.setData(Uri.fromParts("package", activity.getPackageName(), null));
        activity.startActivity(localIntent);
    }

    /**
     * 系统设置界面
     *
     * @param activity
     */
    public static void toSystemConfig(Activity activity) {
        try {
            Intent intent = new Intent(Settings.ACTION_SETTINGS);
            activity.startActivity(intent);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}