我已经创建了一个ButtonField和一个BitmapField之类的。
public class MyCanvas extends MainScreen implements FieldChangeListener
{
HorizontalFieldManager hfm;
private Bitmap startBitmap;
private BitmapField startBitmapField;
private ButtonField okButton;
MyCanvas()
{
hfm = new HorizontalFIeldManager();
startBitmap = Bitmap.getBitmapResource("start.png");
startBitmapField = new BitmapField(startBitmap);
startBitmapField.setChangeListener(this);
hfm.add(startBitmapField);
okButton = new ButtonField("Ok", ButtonField.CONSUME_CLICK | ButtonField.NEVER_DIRTY);
okButton.setChangeListener(this);
hfm.add(okButton);
}
public void fieldChanged(Field field, int context)
{
if(field == startBitmapField)
{
System.out.println("Touched START...");
}
else if(field == okButton)
{
System.out.println("Touched Ok...");
}
}
}
但是在Blackberry 4.7仿真器中没有发生ButtonField或BitmapField单击。
我想为Blackberry Storm构建它,所以我正在使用Blackberry 4.7
如何处理Blackberry Storm的ButtonField和BitmapField的单击/触摸事件?
我在创建ButtonField和BitmapFields为
okButtonField = new ButtonField("Ok", BitmapField.HIGHLIGHT_SELECT | BitmapField.FOCUSABLE);
startBitmapField = new BitmapField(startBitmap, BitmapField.HIGHLIGHT_SELECT | BitmapField.FOCUSABLE);
它与..
protected boolean touchEvent(TouchEvent event)
{
switch( event.getEvent() )
{
case TouchEvent.DOWN: ........
return true;
case TouchEvent.MOVE: .......
return true;
case TouchEvent.UP: ........
return true;
case TouchEvent.CLICK:
if(deleteButton.isFocus())
{
System.out.println("Touched DEL ..........");
}
else if(okButton.isFocus())
{
System.out.println("Touched OK ..........");
}
else if(startBitmapField.isFocus())
{
System.out.println("Touched START ..........");
}
return true;
}
return false;
}
但每次调用具有焦点的相同按钮时。
表示如果“确定”按钮具有焦点,那么即使您单击“删除”按钮,也会调用“确定”按钮。
那么如何改变对按钮点击的关注呢?意味着无论单击哪个ButtonField或BitmapField,都应该获得焦点?
有什么方法可以检查“ button.isClicked(),例如button.isFocus()”吗?
最佳答案
首先,不要忘记在屏幕上添加hfm;)
实际上,单击按钮可以正常工作。
现在,要使位图单击也起作用,请为BitmapField实现受保护的布尔型touchEvent(TouchEvent消息)。创建扩展类会更好:
class MyCanvas extends MainScreen implements FieldChangeListener {
HorizontalFieldManager hfm;
private Bitmap startBitmap;
private BitmapField startBitmapField;
private ButtonField okButton;
private ButtonField cancelButton;
MyCanvas() {
hfm = new HorizontalFieldManager();
add(hfm);
startBitmap = Bitmap.getBitmapResource("start.png");
startBitmapField = new TouchBitmapField(startBitmap);
startBitmapField.setChangeListener(this);
hfm.add(startBitmapField);
okButton = new ButtonField("Ok", ButtonField.CONSUME_CLICK
| ButtonField.NEVER_DIRTY);
okButton.setChangeListener(this);
hfm.add(okButton);
cancelButton = new ButtonField("Cancel", ButtonField.CONSUME_CLICK
| ButtonField.NEVER_DIRTY);
cancelButton.setChangeListener(this);
hfm.add(cancelButton);
}
public void fieldChanged(Field field, int context) {
if (field == startBitmapField) {
System.out.println("Touched START...");
} else if (field == okButton) {
System.out.println("Touched Ok...");
} else if (field == cancelButton) {
System.out.println("Touched Cancel...");
}
}
}
class TouchBitmapField extends BitmapField {
public TouchBitmapField(Bitmap startBitmap) {
super(startBitmap);
}
protected boolean touchEvent(TouchEvent message) {
if (TouchEvent.CLICK == message.getEvent()) {
FieldChangeListener listener = getChangeListener();
if (null != listener)
listener.fieldChanged(this, 1);
}
return super.touchEvent(message);
}
}