如何刷新黑莓OS 6屏幕上的屏幕[上一页]

Question

当点击手机上的返回按钮时，我希望刷新前一个屏幕。在BB 6中是否有任何事件刷新弹出式屏幕上的前一个屏幕。

Answer 1

Screen.onExposed()将在前一个屏幕上调用，并且可以从那里刷新值。

Answer 2

class FirstScreen extends MainScreen { 

    private void refreshOnNextScreenClose() { 
     // some code to refresh the FirstScreen on NextScreen closure 
    } 

    private Runnable onNextScreenCloseCallback = new Runnable() { 
     refreshOnNextScreenClose(); 
    }; 

    // .. 
    // somewhere in the code where you create/push NextScreen 
    NextScreen nextScreen = new NextScreen(onNextScreenCloseCallback); 
    UiApplication.getUiApplication().pushScreen(nextScreen); 
    // .. 
} 

class NextScreen extends MainScreen { 

    private Runnable onCloseCallback; 

    public NextScreen(Runnable onCloseCallback) { 
     super(); 
     this.onCloseCallback = onCloseCallback; 
    } 

    public void close() { 
     super.close(); 
     if (onCloseCallback != null) onCloseCallback.run(); 
    } 
}