Android判断当前应用通知是否 4000 打开，跳转到打开通知界面

判断当前应用通知是否打开方法：

private boolean isNotificationEnabled(Context context) {

String CHECK_OP_NO_THROW = "checkOpNoThrow";
String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";

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 = (Integer) opPostNotificationValue.get(Integer.class);
return ((Integer) 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;
} 返回值为true时，通知栏打开，false未打开。

跳转设置页面：

private void goToSet(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.BASE) {
// 进入设置系统应用权限界面
Intent intent = new Intent(Settings.ACTION_SETTINGS);
startActivity(intent);
return;
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {// 运行系统在5.x环境使用
// 进入设置系统应用权限界面
Intent intent = new Intent(Settings.ACTION_SETTINGS);
startActivity(intent);
return;
}
}