Question

我想通过我的xamarin本机应用程序更改设备语言。我可以使用android studio中的以下代码轻松完成此操作。

public static void changeLanguage()
        throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException,
        IllegalArgumentException, InvocationTargetException, NoSuchFieldException {
    @SuppressWarnings("rawtypes")
    Class amnClass = Class.forName("android.app.ActivityManagerNative");
    Object amn = null;
    Configuration config = null;

    // amn = ActivityManagerNative.getDefault();
    Method methodGetDefault = amnClass.getMethod("getDefault");
    methodGetDefault.setAccessible(true);
    amn = methodGetDefault.invoke(amnClass);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        // getConfiguration moved from ActivityManagerNative to ActivityManagerProxy
        amnClass = Class.forName(amn.getClass().getName());
    }


    // config = amn.getConfiguration();

    Method methodGetConfiguration = amnClass.getMethod("getConfiguration");
    methodGetConfiguration.setAccessible(true);
    config = (Configuration) methodGetConfiguration.invoke(amn);

    // config.userSetLocale = true;
    @SuppressWarnings("rawtypes")
    Class configClass = config.getClass();
    Field f = configClass.getField("userSetLocale");
    f.setBoolean(config, true);

    Locale locale = new Locale("zh", "CN");

    // set the locale to the new value
    config.locale = locale;

    // amn.updateConfiguration(config);
    Method methodUpdateConfiguration = amnClass.getMethod("updateConfiguration", Configuration.class);
    methodUpdateConfiguration.setAccessible(true);
    methodUpdateConfiguration.invoke(amn, config);
}

我想通过Xamarin做同样的事情。但是在xamarin中它会抛出以下错误。

Caused by: java.lang.ClassNotFoundException: Didn't find class "Android.App.ActivityManagerNative"

请让我知道我可以在Xamarin中使用哪个课程来实现同样的目标？

Answer 1

你能指导我哪里出错吗？或者，您可以与我分享您的项目吗？

这是我的代码：

var amnClass = Java.Lang.Class.ForName("android.app.ActivityManagerNative");
Java.Lang.Object amn = null;
Configuration config = null;

var methodGetDefault = amnClass.GetMethod("getDefault");
methodGetDefault.Accessible = true;
amn = methodGetDefault.Invoke(amnClass);

if (Build.VERSION.SdkInt >= Build.VERSION_CODES.O)
{
    amnClass = Java.Lang.Class.ForName(amn.Class.Name);
}

var methodGetConfiguration = amnClass.GetMethod("getConfiguration");
methodGetConfiguration.Accessible = true;
config = methodGetConfiguration.Invoke(amn) as Configuration;

var configClass = config.Class;
var f = configClass.GetField("userSetLocale");
f.SetBoolean(config, true);

Locale locale = new Locale("zh", "CN");

config.Locale = locale;

var methodUpdateConfiguration = amnClass.GetMethod("updateConfiguration", Java.Lang.Class.FromType(typeof(Configuration)));
methodUpdateConfiguration.Accessible = true;
try
{
    methodUpdateConfiguration.Invoke(amn, config);
}
catch (InvocationTargetException ee)
{
    var error = ee.TargetException;
}

这是我的demo。

哪个是xamarin的“Android.App.ActivityManagerNative”等效类？

1 个答案: