Android Notification工具类

1. 在有些情况下，要检测系统是否禁止app显示通知，可以调用一下方法

/**
* 检查是否可以显示通知
* @return
*/
public boolean isNotificationEnabled() {
AppOpsManager mAppOps = (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE);
ApplicationInfo appInfo = mContext.getApplicationInfo();
String pkg = mContext.getApplicationContext().getPackageName();
int uid = appInfo.uid;
Class appOpsClass = null; /* Context.APP_OPS_MANAGER */
try {
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(mAppOps,value, uid, pkg) == AppOpsManager.MODE_ALLOWED);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}