我一直在研究黑莓的应用程序，它在屏幕上有两个按钮（btn1和btn2）。现在我添加了第三个，我遇到了一些困难（btn3）。
最初btn1和btn2并排，点击按钮外部，但在它下方会激活按钮......设计缺陷但可能会被忽略。
但是，我需要在btn1下面添加一个按钮，当我这样做时，发生了两件奇怪的事情：首先是，即使我点击btn3下面的btn1，焦点也是如此转移到btn1并调用btn1。点击btn2会将焦点转移到btn3并激活它。
我不完全确定为什么会这样，但我正在玩下面粘贴的代码。感谢任何一点帮助。
btn1 = new CustomButtonField("", Bitmap.getBitmapResource("button-disabled_1a.png"), Bitmap.getBitmapResource("button-normal_2.png"));
btn2 = new CustomButtonField("", Bitmap.getBitmapResource("button-disabled_3.png"), Bitmap.getBitmapResource("button-normal_4.png"));
btn3 = new CustomButtonField("", Bitmap.getBitmapResource("button-disabled5.png"), Bitmap.getBitmapResource("button-normal_6.png"));
Background bg = BackgroundFactory.createBitmapBackground(Bitmap.getBitmapResource("background.png"));
HorizontalFieldManager vfm = new HorizontalFieldManager(){
public int getPreferredHeight() {
// TODO Auto-generated method stub
return Display.getHeight();
}
public int getPreferredWidth() {
// TODO Auto-generated method stub
return Display.getWidth();
}
protected void sublayout(int maxWidth, int maxHeight) {
// TODO Auto-generated method stub
int count = getFieldCount();
for(int i = 0 ; i < count ; i++ ){
Field f = getField(i);
if(f == btn1 ){
setPositionChild(f, (getPreferredWidth() >> 1) - f.getPreferredWidth(), getPreferredHeight()>>1);
layoutChild(f, getPreferredWidth(), getPreferredHeight());
}else if (f == btn2 ){
setPositionChild(f, (getPreferredWidth() >> 1) +30, getPreferredHeight()>>1);
layoutChild(f, getPreferredWidth(), getPreferredHeight());
}else if (f == lblName ){
setPositionChild(f, 30, getPreferredHeight()>>1 - btnLicense.getPreferredHeight());
layoutChild(f, ( getPreferredWidth() * 3 ) >> 2, getPreferredHeight());
}else if (f == btn3 ){
setPositionChild(f, (getPreferredWidth() >> 1) - f.getPreferredWidth() -0 , getPreferredHeight()- getPreferredHeight()+280);
layoutChild(f, getPreferredWidth(), getPreferredHeight());
}
}
setExtent(getPreferredWidth(),getPreferredHeight());
}
public void subpaint(Graphics graphics){
int count = getFieldCount();
for(int i = 0 ; i < count ; i++ ){
net.rim.device.api.ui.Field f = getField(i);
paintChild(graphics,f);
}
}
};
自定义按钮字段
package com.app.ui.component;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
public class CustomButtonField extends Field {
/** To set background image for button field */
private Bitmap bkImage;
/** To set Focus image for button field */
private Bitmap bkFocusImage;
/** int value for Field Width */
private int fieldWidth;
/** int value for Field Height */
private int fieldHeight;
/** Text to write on Button */
private String text;
/** Text Color on Button */
private int textColor = Color.WHITE;
/** Default Font for Button */
private Font defaultFont = Font.getDefault();
/**
* Constructor with
* @param text
* @param image
* @param focusImage
*/
public CustomButtonField (String text, Bitmap image, Bitmap focusImage) {
this(text, image, focusImage, 0);
}
/**
* Constructor with
* @param text
* @param image
* @param focusImage
* @param style
*/
public CustomButtonField(String text, Bitmap image, Bitmap focusImage, long style) {
super(Field.FOCUSABLE | style);
this.text = text;
bkImage = image;
this.bkFocusImage = focusImage;
fieldHeight = bkImage.getHeight();
fieldWidth = bkImage.getWidth();
}
/**
* To get the exact width needed by the field borderWidth - used to show the
* width of focused rectangle around the button
*/
public int getPreferredWidth() {
return fieldWidth;
}
/**
* To get the exact width needed by the field borderHeight - used to show
* the height of focused rectangle around the button
*/
public int getPreferredHeight() {
return fieldHeight;
}
protected void layout(int width, int height) {
setExtent(getPreferredWidth(), getPreferredHeight());
}
/**
* To set the background according to focused state of the field
*/
protected void drawFocus(Graphics graphics, boolean flag) {
graphics.setFont(defaultFont);
if (bkFocusImage != null) {
graphics.drawBitmap((getPreferredWidth() - bkFocusImage.getWidth()) / 2,(getPreferredHeight() - bkFocusImage.getHeight()) / 2,
bkFocusImage.getWidth(), bkFocusImage.getHeight(),bkFocusImage, 0, 0);
}
graphics.setColor(Color.WHITE);
int textWidth = defaultFont.getAdvance(text);
graphics.drawText(text, (fieldWidth - textWidth) / 2,(fieldHeight - defaultFont.getHeight()) / 2);
}
protected void paint(Graphics graphics) {
graphics.setFont(defaultFont);
if (bkImage != null) {
graphics.drawBitmap((getPreferredWidth() - bkImage.getWidth()) / 2,(getPreferredHeight() - bkImage.getHeight()) / 2,
bkImage.getWidth(), bkImage.getHeight(), bkImage, 0, 0);
}
graphics.setColor(textColor);
int color = (isEnabled())?Color.BLACK:Color.DARKGRAY;
graphics.setColor(color);
int textWidth = defaultFont.getAdvance(text);
graphics.drawText(text, (fieldWidth - textWidth) / 2,(fieldHeight - defaultFont.getHeight()) / 2);
}
protected boolean navigationClick(int status, int time) {
fieldChangeNotify(0);
return true;
}
}
答案 0 :(得分：2)
当您第一次实施自定义BlackBerry按钮和字段时，这是一个非常简单的问题。首先，这里的问题是你的CustomButtonField类是一个从头开始写的按钮字段，它没有正确地确定哪个触摸事件（或导航事件）在其范围内（在田地里面。）
解决此问题的一种方法是修改navigationClick()方法，并实施touchEvent()方法：
protected boolean touchEvent( TouchEvent message ) {
int x = message.getX( 1 );
int y = message.getY( 1 );
if( x < 0 || y < 0 || x > getExtent().width || y > getExtent().height ) {
// Outside the field
return false;
}
switch( message.getEvent() ) {
case TouchEvent.UNCLICK:
fieldChangeNotify(0);
return true;
}
return super.touchEvent( message );
}
protected boolean navigationClick(int status, int time) {
if (status != 0) { // you did not have this check
fieldChangeNotify(0);
}
return true;
}
我实际建议的另一个选择是用BlackBerry Advanced UI library
中的一个样本替换整个CustomButtonField课程
您可以使用BitmapButtonField及其扩展的BaseButtonField来实现相同的功能，并通过正确的触摸/点击处理。
当你在那里时，看一下该库中的其他一些UI类，因为你可能会发现它们非常有用。