如何从Qt的Andr​​oid手机震动 [英] How to make phone vibrate from Qt Android

问题描述

我部署使用Qt的Andr​​oid应用程序。

I'm deploying Android app using Qt.

我想使手机震动。于是我试图执行这个code 使用 QAndroidJniObject 。

I'd like to make the phone vibrate. So I try to execute this code using QAndroidJniObject.

Java的code：

Java code:

import android.os.Vibrator;
Vibrator v = (Vibrator) this.context.getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(500);

C ++的Qt code：

C++ Qt code:

QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");

if ( activity.isValid() )
{
    QAndroidJniObject serviceName = QAndroidJniObject::fromString("android.content.Context.VIBRATOR_SERVICE");
    if ( serviceName.isValid() )
    {
        QAndroidJniObject vibrator = activity.callObjectMethod("getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;",serviceName.object<jobject>());
        if ( vibrator.isValid() )
        {
            vibrator.callMethod<void>("vibrate", "(J)V", 1000);
        }
        // vibrator is actually not valid!
    }
}

vibrator.isValid（）返回false，我想不通为什么....这不是我第一次尝试做这样的东西，但在这里，我不能让它工作。

vibrator.isValid() returns false and I cannot figure out why....It's not my first time trying to do this kind of stuff, but here, I can't make it work.

请注意：我的应用程序有 android.permission.VIBRATE 设置

Note: My app has android.permission.VIBRATE set

推荐答案

从我能从的文档， QAndroidJniObject :: fromString 返回一个对象包装Java字符串与你给内容fromString 。

From what I could gather from the documentation, QAndroidJniObject::fromString returns an object wrapping a Java string with the contents that you gave to fromString.

所以，你在做什么，现在就好像是你做了Java中的以下内容：

So what you're doing right now is as if you had done the following in Java:

Object vibrator = getSystemService("Context.VIBRATOR_SERVICE");

当你真正想要的是：

Object vibrator = getSystemService(Context.VIBRATOR_SERVICE);

因此​​，而不是使用 QAndroidJniObject :: fromString 你也应该可以做这样的事情：

So instead of using QAndroidJniObject::fromString you probably ought to be doing something like this:

QAndroidJniObject serviceName = 
    QAndroidJniObject::getStaticObjectField<jstring>(
        "android/content/Context",
        "VIBRATOR_SERVICE");

这有可能是你需要删除本地引用服务名之后。

这篇关于如何从Qt的Andr​​oid手机震动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！