NotificationCheckUtil.java

package com.forfan.bigbang.util;

import android.app.AppOpsManager;
import android.content.Context;
import android.content.pm.ApplicationInfo;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Created by penglu on 2016/9/20.
 */
public class NotificationCheckUtil {
    private static final String CHECK_OP_NO_THROW = "checkOpNoThrow";
    private static final String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";

    public static boolean areNotificationsEnabled(Context context) {
        AppOpsManager appOps = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
            appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
            ApplicationInfo appInfo = context.getApplicationInfo();
            String pkg = context.getApplicationContext().getPackageName();
            int uid = appInfo.uid;
            try {
                Class<?> appOpsClass = Class.forName(AppOpsManager.class.getName());
                Method checkOpNoThrowMethod = appOpsClass.getMethod(CHECK_OP_NO_THROW, Integer.TYPE,
                        Integer.TYPE, String.class);
                Field opPostNotificationValue = appOpsClass.getDeclaredField(OP_POST_NOTIFICATION);
                int value = (int) opPostNotificationValue.get(Integer.class);
                return ((int) checkOpNoThrowMethod.invoke(appOps, value, uid, pkg)
                        == AppOpsManager.MODE_ALLOWED);
            } catch (ClassNotFoundException | NoSuchMethodException | NoSuchFieldException |
                    InvocationTargetException | IllegalAccessException | RuntimeException e) {
                return true;
            }
        }else {
            return true;
        }
    }
}