为什么使用postGlobalScreen推送该屏幕时，屏幕上的按钮不起作用？
我编辑 Blackberry_App_Descriptor.xml 以使我的应用程序“启动时自动运行”。我的应用程序有 3 个类：myApp、screen1 和 screen2。 MyApp 的主要方法是推送 screen1。在屏幕 1 中有一个按钮可以推动屏幕 2。当我手动启动应用程序时，它运行正常。 （点击应用程序的图标）
问题是：
我使用 RealTimeListener 总是每分钟检查一次时间，如果是 1h30 它将推送 screen1，（我使用方法 postGlobalScreen 来推送 Screen1）。它推动了成功。但我可以使用此 screen1 上的按钮，我单击了它，但它没有推送到 screen2。
我尝试使用备用入口点来检查时间并推送 screen1，但结果相同。
有人可以帮我解决并清楚地解释这个问题吗？
// MyApp.java
public class MyApp extends UiApplication implements RealtimeClockListener
{
/**
* Entry point for application
* @param args Command line arguments (not used)
*/
public static void main(String[] args)
{
// Create a new instance of the application and make the currently
// running thread the application's event dispatch thread.
MyApp theApp = new MyApp();
theApp.enterEventDispatcher();
}
/**
* Creates a new MyApp object
*/
public MyApp()
{
// Push a screen onto the UI stack for rendering.
pushScreen(new Screen1());
addRealtimeClockListener(this);
}
public void clockUpdated() {
int hour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
int minute = Calendar.getInstance().get(Calendar.MINUTE);
if(hour==1 && minute == 30){
UiApplication.getUiApplication().pushGlobalScreen(new Screen1(),1,UiEngine.GLOBAL_MODAL);
}
}
}
//Screen1.java
public final class Screen1 extends MainScreen implements FieldChangeListener
{
/**
* Creates a new MyScreen object
*/
ButtonField button;
public Screen1()
{
button = new ButtonField("Screen 1 ");
button.setChangeListener(this);
add(button);
}
public void fieldChanged(Field field, int context) {
if(field==button){
UiApplication.getUiApplication().pushScreen(new Screen2());
}
}
}
//Screen2.java
public final class Screen2 extends MainScreen implements FieldChangeListener
{
/**
* Creates a new MyScreen object
*/
ButtonField button;
public Screen2()
{
button = new ButtonField("Screen2");
button.setChangeListener(this);
add(button);
}
public void fieldChanged(Field field, int context) {
if(field==button){
UiApplication.getUiApplication().pushScreen(new Screen1());
}
}
}
I edit Blackberry_App_Descriptor.xml to make my app is "Auto run on start up". My app have 3 classes, myApp, screen1 and screen2. MyApp with main method to push screen1. in screen1 have a button to push screen 2. It run OK when I launch appplication manualy. (click icon of App )
Problem is:
I use RealTimeListener to always check time each minutes, if it is 1h30 it will push screen1, ( I used method postGlobalScreen to push Screen1 ). And it pushed success. But i can use the button on this screen1, I clicked it and it not push to screen2.
I try to use Alternate Entry point to check time and push screen1 but it have the same result.
Can anybody help me solve and explain clearly about this problem ?
// MyApp.java
public class MyApp extends UiApplication implements RealtimeClockListener
{
/**
* Entry point for application
* @param args Command line arguments (not used)
*/
public static void main(String[] args)
{
// Create a new instance of the application and make the currently
// running thread the application's event dispatch thread.
MyApp theApp = new MyApp();
theApp.enterEventDispatcher();
}
/**
* Creates a new MyApp object
*/
public MyApp()
{
// Push a screen onto the UI stack for rendering.
pushScreen(new Screen1());
addRealtimeClockListener(this);
}
public void clockUpdated() {
int hour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
int minute = Calendar.getInstance().get(Calendar.MINUTE);
if(hour==1 && minute == 30){
UiApplication.getUiApplication().pushGlobalScreen(new Screen1(),1,UiEngine.GLOBAL_MODAL);
}
}
}
//Screen1.java
public final class Screen1 extends MainScreen implements FieldChangeListener
{
/**
* Creates a new MyScreen object
*/
ButtonField button;
public Screen1()
{
button = new ButtonField("Screen 1 ");
button.setChangeListener(this);
add(button);
}
public void fieldChanged(Field field, int context) {
if(field==button){
UiApplication.getUiApplication().pushScreen(new Screen2());
}
}
}
//Screen2.java
public final class Screen2 extends MainScreen implements FieldChangeListener
{
/**
* Creates a new MyScreen object
*/
ButtonField button;
public Screen2()
{
button = new ButtonField("Screen2");
button.setChangeListener(this);
add(button);
}
public void fieldChanged(Field field, int context) {
if(field==button){
UiApplication.getUiApplication().pushScreen(new Screen1());
}
}
}
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
请尝试以下。这里集中注意两点
1）应用程序在后台运行
2）将后台应用程序发送到前台
screen1.java
screen2.java
Please try following. here concentrate on two points
1)Application run in background background
2)send background application into foreground
screen1.java
screen2.java