使用字符串参数调用AndroidJni静态方法。

I am trying to call a Java static function in Qt C++ class using QAndroidJniObject with a string parameter.

在Qt c++类中，我尝试使用带有字符串参数的QAndroidJniObject调用一个Java静态函数。

This is my Java class having function which i am calling

这是我调用的Java类。

        public class StatusBar{

        public static void setStatusBarBackgroundColor(Activity activity,String colorPref) {

// My code


         }  
        }

I am calling this function from C++ as

我用c++来调用这个函数。

void ECApplicationInfo::changeStatusBarColor(QString color)
{
  QAndroidJniObject::callStaticMethod<void>( 
                  "com/ezeecube/ezeesync/StatusBar",
                  "setStatusBarBackgroundColor",
                  "(Landroid/app/Activity;)V",
                   activity,color);
}

I am getting the following error

我得到了以下错误。

error: cannot pass objects of non-trivially-copyable type 'class QString' through '...' activity,color);

错误:不能通过“……”的活动,颜色);

How can i get rid of this error

我怎样才能摆脱这个错误呢?

2 个解决方案

#1

The definition of your function signature is not correct. You should also specify the second argument which has a type of Ljava/lang/String;. Also you should convert QString to jstring and the pass it as an argument :

函数签名的定义不正确。您还应该指定具有Ljava/lang/String类型的第二个参数;还应该将QString转换为jstring，并将其作为参数传递:

QAndroidJniObject::callStaticMethod<void>( 
                  "com/ezeecube/ezeesync/StatusBar",
                  "setStatusBarBackgroundColor",
                  "(Landroid/app/Activity;Ljava/lang/String;)V",
                   activity,QAndroidJniObject::fromString(color).object<jstring>());

2 个解决方案

#1

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