判断用户是否允许通知消息

public class NotificationsTool {
private static final String CHECK_OP_NO_THROW = "checkOpNoThrow";
private static final String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public static boolean isNotificationEnabled(Context context) {

AppOpsManager mAppOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);

ApplicationInfo appInfo = context.getApplicationInfo();

String pkg = context.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 (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return false;
}

}