如何从 android 本机代码调用 ShowForm？

Question

我正在使用 codenameone，我需要在 android 中执行一些本机代码，但这涉及更改内容视图，当我尝试让应用程序返回 codenameone 表单时，使用本机代码我最终会出现白屏，

无论如何我可以使用showForm 那codenameone 处理来自android 本机代码的导航？？

在尝试了下面的 cmets 之后，这里是模拟案例时应用程序的日志猫：

??-?? ??:??:??.???: INFO/<unknown>(<unknown>): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.mycompany.myapp/.MyApplicationStub bnds=[540,672][786,960]} from uid 10010 on display 0 from pid 1738 ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Start proc 31254:com.mycompany.myapp/u0a352 for activity com.mycompany.myapp/.MyApplicationStub ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Gaining focus: Window{252c6842 u0 com.mycompany.myapp/com.mycompany.myapp.MyApplicationStub} ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): [AppLaunch] Displayed Displayed com.mycompany.myapp/.MyApplicationStub: +335ms ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Thread[1,tid=31254,WaitingForJniOnLoad,Thread*=0x7facc9a000,peer=0x760befb0,"main"] recursive attempt to load library "/data/app/com.mycompany.myapp-1/lib/arm64/libopentok.so" ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Thread[1,tid=31254,WaitingForJniOnLoad,Thread*=0x7facc9a000,peer=0x760befb0,"main"] recursive attempt to load library "/data/app/com.mycompany.myapp-1/lib/arm64/libopentok.so" ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Thread[1,tid=31254,WaitingForJniOnLoad,Thread*=0x7facc9a000,peer=0x760befb0,"main"] recursive attempt to load library "/data/app/com.mycompany.myapp-1/lib/arm64/libopentok.so" ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Thread[1,tid=31254,WaitingForJniOnLoad,Thread*=0x7facc9a000,peer=0x760befb0,"main"] recursive attempt to load library "/data/app/com.mycompany.myapp-1/lib/arm64/libopentok.so" ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Thread[1,tid=31254,WaitingForJniOnLoad,Thread*=0x7facc9a000,peer=0x760befb0,"main"] recursive attempt to load library "/data/app/com.mycompany.myapp-1/lib/arm64/libopentok.so" ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): setMode: mode = 3; packageName = com.mycompany.myapp ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): setMode: mode = 0; packageName = com.mycompany.myapp ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): at com.mycompany.myapp.VideoChat$1.run(Unknown Source) ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Process: com.mycompany.myapp, PID: 31254 ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): at com.mycompany.myapp.NativeVideoChatImpl$VideoChat$4.onClick(NativeVideoChatImpl.java:234) ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Force finishing activity 1 com.mycompany.myapp/.MyApplicationStub ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Losing focus: Window{252c6842 u0 com.mycompany.myapp/com.mycompany.myapp.MyApplicationStub} ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Process com.mycompany.myapp (pid 31254) has died ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): channel '252c6842 com.mycompany.myapp/com.mycompany.myapp.MyApplicationStub (server)' ~ Consumer closed input channel or an error occurred. events=0x9 ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): channel '252c6842 com.mycompany.myapp/com.mycompany.myapp.MyApplicationStub (server)' ~ Channel is unrecoverably broken and will be disposed! ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): WIN DEATH: Window{252c6842 u0 com.mycompany.myapp/com.mycompany.myapp.MyApplicationStub} ??-?? ??:??:??.???: INFO/<unknown>(<unknown>): Attempted to unregister already unregistered input channel '252c6842 com.mycompany.myapp/com.mycompany.myapp.MyApplicationStub (server)'

Answer 1

请参阅标题为“本机代码回调”的 advanced section in the developer guide。

创建一个静态方法，例如showForm() 在您创建表单的类中。在您的原生 Android 代码中，您可以使用实现该方法的类的完整包名来调用该方法，例如：com.mycompany.myapp.MyFormClass.showForm()。

实现该方法的类需要有一个对表单的引用，所以它可以是创建表单并保持对表单的静态引用的类。为了保留内存，您可能希望在表单被关闭时释放引用。

在 iOS 和其他平台中，请遵循开发者指南中的指南，例如在这种情况下，iOS showForm() 看起来像这样（在您的 .m 文件的顶部：

#include "com_mycompany_myapp_MyFormClass.h"

那么当你想打电话给showForm()：

com_mycompany_myapp_MyFormClass_showForm__(CN1_THREAD_STATE_PASS_SINGLE_ARG);

Answer 2

在尝试了所有的场景之后，我注意到它实际上回到了表单但没有显示内容，所以这是我在另一个应用程序中遇到这个问题后所做的， 代码是在本机端实现的 -- 尝试改变时间段，当我少去的时候问题又回来了，所以这对我来说已经足够好了

getActivity().finish();
            intent = new Intent(getContext(), MyApplicationStub.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NO_ANIMATION);
            handler = new Handler();
            timer = new Timer();    
            initializeTimerTask();
            timer.schedule(timerTask, 500);

public void initializeTimerTask() {

            timerTask = new TimerTask() {
                public void run() {

                    //use a handler to run a toast that shows the current timestamp
                    handler.post(new Runnable() {
                        public void run() {
                            getContext().startActivity(intent);
                        }
                    });
                }
            };
        }

感谢@JamesH 和@Shai 的所有帮助