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，但是我想要更改内容视图，当我尝试让应用程序返回到codenameone表单时，使用本机代码我最终会使用白色屏幕，

无论如何，我可以使用showForm ，codenameone处理从Android本机代码导航？

在尝试下面的评论后，这里是应用程序的日志猫，同时模拟案例：

??-?? ??:??:??.???: 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” 的开发人员指南中的高级部分 。

在创建表单的类中创建一个静态方法，例如showForm() 。 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() 。

然后，实现该方法的类需要具有对表单的引用，因此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，如果表单被取消，您可能希望释放引用。

在iOS和其他平台上遵循开发人员指南中的指导，例如在这种情况下，iOS showForm()看起来像这样（在.m文件的顶部：

#include "com_mycompany_myapp_MyFormClass.h"

然后当你想调用showForm() ：

com_mycompany_myapp_MyFormClass_showForm__(CN1_THREAD_STATE_PASS_SINGLE_ARG);

Answer 2

在尝试了所有的senarios之后，我注意到它实际上回到了表单但内容没有显示，所以这是我做的，因为我在另一个应用程序中遇到此问题，代码是在本机端实现的 - 试图改变时间段，当我减少时，问题返回，这对我来说已经足够了

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);
                        }
                    });
                }
            };
        }

感谢你的所有帮助@JamesH和@Shai