我有一个Blackberry本机应用程序，我在过去几周一直在研究。 基本上它由几个屏幕组成，我可以通过覆盖FieldManagers的绘制方法来绘制我的屏幕设计 我已经测试了黑莓4.5和其他黑莓的 到目前为止，它一直很顺利，直到我遇到黑莓保时捷版本的故障测试 这不能很好地展现我的设计。我所经历的是，在滚动时，我的屏幕被擦掉了。 请允许这里的任何人在过去经历过这样的问题，原因是什么。我愿意展示代码的各个部分，以深入了解我遇到的问题。至少我提到它在没有这些问题的模拟器上显示良好。
我已经发布了一个示例屏幕，这是我的登录屏幕：
final VerticalFieldManager everythingPanel = new VerticalFieldManager(VERTICAL_SCROLL)
{
public void paint(Graphics graphics)
{
graphics.setBackgroundColor(new UtilNew().ashbrand);
graphics.clear();
super.paint(graphics);
}
public void sublayout(int width, int height){
super.sublayout(Display.getWidth(),Display.getHeight());
setExtent(Display.getWidth(), Display.getHeight());
}
};
final VerticalFieldManager spaceHolder1 = new VerticalFieldManager()
{
public void paint(Graphics graphics)
{
graphics.setBackgroundColor(new Util().ashbrand);
graphics.clear();
super.paint(graphics);
}
public void sublayout(int width, int height){
super.sublayout(Display.getWidth(),topSpaceHeight);
setExtent(Display.getWidth(), topSpaceHeight);
}
};
final VerticalFieldManager contentHolderPix = new VerticalFieldManager(VerticalFieldManager.VERTICAL_SCROLL)
{
public void paint(Graphics graphics)
{
graphics.setBackgroundColor(util.ashbrand);//black
graphics.setColor(new Util().whitebrand);
System.out.println(">>>>!!!!>>>>" + "img/icons/logo" + new Util().getResource() + ".png");
EncodedImage image_1 = EncodedImage.getEncodedImageResource("img/icons/icon" + new Util().getResource() + ".png");
setFont(util.initializeUtilFont("Arial", editFieldFontHeaderSize, Font.BOLD));
int startHere = topSpaceHeight - image_1.getHeight() - 5;
int imageWidth1 = (int)((Display.getWidth() - image_1.getWidth() - getFont().getAdvance("Sign In"))/2);
graphics.drawBitmap(new XYRect(imageWidth1 - 10 - whiteBgEdge.left - whiteBgEdge.right, startHere, image_1.getWidth(), image_1.getHeight()), image_1.getBitmap(), 0, 0);
int startfonty = startHere + ((image_1.getHeight() - getFont().getHeight())/2);
graphics.drawText("Sign In", imageWidth1, startfonty);
super.paint(graphics);
}
public void sublayout(int width, int height){
super.sublayout(whiteBgWidth,topSpaceHeight);
setExtent(whiteBgWidth, topSpaceHeight);
setMargin(whiteBgEdge);
}
};
System.out.println("whiteBgWidth>>>>" + whiteBgWidth);
System.out.println("padExtWhiteBg>>>>" + padExtWhiteBg);
usernameField = utilNew.newEditTextField(editFieldWidth, editFont.getHeight(), 30,
EditField.NO_NEWLINE, "", editFieldPad, editFont, false, "Username");
passwordField = utilNew.newPasswordField(editFieldWidth, editFont.getHeight(), 30,
PasswordEditField.NO_NEWLINE, "Password", editFieldPad, editFont);
//usernameField.setMargin(holderPad1);
if(user_!=null && user_.getSignInUserName()!=null && user_.getSignInUserName().trim().length()>0)
usernameField.setText(user_.getSignInUserName());
final int edHt = editFont.getHeight() + editFieldPad.top + editFieldPad.bottom;
final int edWt = editFieldWidth + editFieldPad.left + editFieldPad.right;
System.out.println("edHt = " + edHt);
System.out.println("edWt = " + edWt);
System.out.println("HolderPad1 = " + holderPad1.top + ", " + holderPad1.bottom + ", " + holderPad1.left + ", " + holderPad1.right);
usernameFieldHolder = utilNew.generateEditTextField(usernameField, true, holderPad1, edHt, edWt, true);
passwordFieldHolder = utilNew.generateEditTextField(passwordField, true, holderPad2, edHt, edWt, false);
final int height_ = edHt + edHt + holderPad1.top + holderPad1.bottom + holderPad2.top + holderPad2.bottom + 20;
System.out.println("height___>>>>>" + height_);
final VerticalFieldManager contentHolder1 = new VerticalFieldManager()
{
public void paint(Graphics graphics)
{
//System.out.println(edHt + "," + edHt + "," + holderPad1.top + "," + holderPad1.bottom + "," + holderPad2.top + "," + holderPad2.bottom);
graphics.setBackgroundColor(util.ashbrand);//black
graphics.setColor(new Util().whitebrand);
graphics.drawRoundRect(0, 0, whiteBgWidth, height_, 20, 20);
graphics.fillRoundRect(0, 0, whiteBgWidth, height_, 20, 20);
graphics.setColor(0x00808080);
//System.out.println("This is changed?");
//System.out.println("<<<<<<.." + usernameFieldHolder.getPreferredHeight() + "hfm.getPreferredHeight() = 0" + usernameFieldHolder.getWidth() );
//graphics.drawLine(40, usernameField.getPreferredHeight(), whiteBgWidth, usernameField.getPreferredHeight());/**/
super.paint(graphics);
}
public void sublayout(int width, int height){
System.out.println(Display.getHeight() + " - " + Display.getWidth());
System.out.println("Wdith & height = " + width + " && " + height);
System.out.println("Wdith & this.getPreferredHeight() = " + this.getWidth() + " && " + this.getHeight());
super.sublayout(whiteBgWidth,height_);
setExtent(whiteBgWidth, height_);
setMargin(whiteBgEdge);
}
};
int buttonHeight = 70;
/*CustomManager hfm_buttons = util.generateHFM1(
contentHolder1.getPreferredWidth(),
buttonHeight,
new Util().whitebrand,
0);*/
//submitButton = new UtilNew().generateButtonField(0x333333, util.whitebrand, "LOGIN", null);
//registerButton = new UtilNew().generateButtonField(0x333333, util.whitebrand, "REGISTER", null);
final LabelField loginButton = new LabelField("", Field.FOCUSABLE)
{
private int hColor;
public boolean isFocusable() {
return true;
}
protected void drawFocus(Graphics g, boolean on){
XYRect rect = new XYRect();
getFocusRect(rect);
drawHighlightRegion(g, HIGHLIGHT_FOCUS, false, rect.x, rect.y, rect.width, rect.height);
}
public void paint(Graphics g)
{
EncodedImage left;
EncodedImage right;
EncodedImage center;
if(isFocus())
{
left = EncodedImage.getEncodedImageResource("img/buttons/left.png");
center = EncodedImage.getEncodedImageResource("img/buttons/center.png");
right = EncodedImage.getEncodedImageResource("img/buttons/right.png");
g.setColor(util.green);
hColor = 0xcccccc;
}
else
{
left = EncodedImage.getEncodedImageResource("img/buttons/_left.png");
center = EncodedImage.getEncodedImageResource("img/buttons/_center.png");
right = EncodedImage.getEncodedImageResource("img/buttons/_right.png");
g.setColor(util.greenDark);
hColor = util.ashbrand;
}
//g.fillRect(0, 0, getPreferredWidth(), getPreferredHeight());
int totalWidth = whiteBgWidth + 4;
XYRect left_edge=new XYRect(2, 2, left.getWidth(), left.getHeight());
g.drawBitmap(left_edge, left.getBitmap(), 0, 0);
//invalidate();
int startX= (Display.getWidth() - totalWidth)/2;
int vount = (int)((totalWidth - left.getWidth() - right.getWidth())/center.getWidth()) - 3;
//System.out.println("vount = " + vount);
int widthbt = 0;
for(int c=0; c<vount; c++)
{
widthbt = left.getWidth() + (c*center.getWidth())+2;
XYRect center_edge=new XYRect(widthbt, 2, center.getWidth(), center.getHeight());
g.drawBitmap(center_edge, center.getBitmap(), 0, 0);
}
XYRect right_edge=new XYRect(widthbt,2, right.getWidth(), right.getHeight());
g.drawBitmap(right_edge, right.getBitmap(), 0, 0);
//invalidate();
//g.drawBitmap(right_edge, right.getBitmap(), 0, 0);
//g.fillRect(left_edge.getWidth(), 0, getPreferredWidth(), getPreferredHeight());
int colorOld = g.getColor();
g.setColor(hColor);
g.drawRoundRect(0, 0, totalWidth-4, left.getHeight()+4, 3, 3);
g.setColor(colorOld);
if(isFocus())
{
g.setColor(util.black);
}
else
{
g.setColor(util.whitebrand);
}
int height = (left.getHeight() - getFont().getHeight())/2;
int width = (totalWidth - getFont().getAdvance("Sign In"))/2;
g.drawText("Sign In", width, height);
setExtent(totalWidth+ 5,left.getHeight() + 10);
//setMargin(new XYEdges(20, 10, 0, whiteBgEdge.left));
invalidate();
super.paint(g);
}
public int getPreferredHeight() {
return getFont().getHeight() + 20;
}
public int getPreferredWidth() {
return (int)(whiteBgWidth);
}
protected boolean navigationClick(int status, int time) {
removeAllMenuItems();
String userName = usernameField.getText().toString().toLowerCase();
user_.setSignInUserName(userName);
String passWord = passwordField.getText().toString();
System.out.println("username = " + userName + " & password = " + passWord);
User user = User.getInstance();
System.out.println(">>instance of user from sign in: " + user);
Records record = new Records();
if(passWord.trim().length() < 2 || userName.trim().length() < 2){
Dialog.alert("Invalid username and/or password entered");
SignIn screen = new SignIn();
ScreenController screenController = ScreenController.getInstance();
screenController.addNewScreen(screen);
}else{
System.out.println("else if data is calid");
String hashPassword = user.md5Java(passWord);
hashPassword = "e86e107b113b0f830b9b817b4a9addb8";
user_.setUserName(userName);
user_.setPassword(passWord);
System.out.println("Check data availability");
try
{
FileConnection fc = (FileConnection)Connector.open(utilNew.FOLDER_LOCATION);
FileConnection fc1 = (FileConnection)Connector.open(utilNew.FOLDER_LOCATION_REF);
if (!fc.exists())
{
fc.mkdir();
if (!fc1.exists())
{
fc.mkdir();
}
}
fc.close();
}
catch (IOException ioe)
{
System.out.println(ioe.getMessage() );
}
if((record.isDataAvailable(record.userTable)==true))
{
System.out.println(">>>>@@@ -1 ");
String[] allRecords = record.getAllRecords(record.userTable);
boolean proceedYes = true;
int count = 0;
while(proceedYes && count<allRecords.length)
{
System.out.println(">>>> Record = " + allRecords[count]);
//Dialog.alert(">>>> Record = " + allRecords[count]);
DataInputStream is = new DataInputStream(new ByteArrayInputStream(allRecords[count].getBytes()));
try {
System.out.println(">>>>555");
//System.out.println(">>>>" + is.readUTF() + " && " + is.readUTF() + " && " + is.readUTF());
String l = is.readUTF();
String u = is.readUTF();
String p = is.readUTF();
//System.out.println("e>>>>" + is.readUTF() + " && " + is.readUTF() + " && " + is.readUTF());
System.out.println("f>>>>" + l + " && " + u + " && " + p);
System.out.println("g>>>>" + userName + " && " + passWord + " && " + p);
if(u.equals(userName) && p.equals(passWord))
{
//Dialog.alert(">>>>12");
System.out.println(">>>889948444>");
proceedYes = false;
MenuLists screen = new MenuLists(10);
//UiApplication.getUiApplication().pushScreen(homeScreen);
ScreenController screenController = ScreenController.getInstance();
screenController.setCurrentScreen(SignIn.this);
screenController.addNewScreen(screen);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println(">>>>Error " + e.getMessage() + " && " + e.toString() );
}
count++;
}
if(proceedYes)
{
System.out.println(">>>>@@@ 3 ");
Hashtable jj = new Hashtable();
boolean proceedNow = false;
jj.put("username", userName);
jj.put("password", passWord);
jj.put("url", "https://localhost:8080/signinws/rest/account/login2");
System.out.println("object sent to server: "+jj);
ProcessAction processAction = new ProcessAction(jj, 0, record);
PopUpScreen.showScreenAndWait(processAction, "Setting up our account. Please Wait");
}
}
else
{
System.out.println(">>>>@@@ o ");
Hashtable jj = new Hashtable();
boolean proceedNow=false;
System.out.println(">>>>@@@ 4 ");
jj.put("username", userName);
jj.put("password", passWord);
jj.put("url", "https://localhost:8080/signinws/rest/account/login2");
System.out.println("object sent to server: "+jj);
proceedNow = true;
ProcessAction processAction = new ProcessAction(jj, 0, record);
PopUpScreen.showScreenAndWait(processAction, "Please Wait");
}
}
return super.navigationClick(status, time);
}
};
final LabelField registerButton = new LabelField("", Field.FOCUSABLE)
{
public boolean isFocusable() {
return true;
}
protected void drawFocus(Graphics g, boolean on){
XYRect rect = new XYRect();
getFocusRect(rect);
drawHighlightRegion(g, HIGHLIGHT_FOCUS, false, rect.x, rect.y, rect.width, rect.height);
}
public void paint(Graphics g)
{
EncodedImage left;
EncodedImage right;
EncodedImage center;
int hColor;
if(isFocus())
{
left = EncodedImage.getEncodedImageResource("img/buttons/left.png");
center = EncodedImage.getEncodedImageResource("img/buttons/center.png");
right = EncodedImage.getEncodedImageResource("img/buttons/right.png");
g.setColor(util.green);
hColor = 0xcccccc;
}
else
{
left = EncodedImage.getEncodedImageResource("img/buttons/_left.png");
center = EncodedImage.getEncodedImageResource("img/buttons/_center.png");
right = EncodedImage.getEncodedImageResource("img/buttons/_right.png");
g.setColor(util.greenDark);
hColor = util.ashbrand;
}
//g.fillRect(0, 0, getPreferredWidth(), getPreferredHeight());
int totalWidth = whiteBgWidth + 4;
XYRect left_edge=new XYRect(2, 2, left.getWidth(), left.getHeight());
g.drawBitmap(left_edge, left.getBitmap(), 0, 0);
//invalidate();
int startX= (Display.getWidth() - totalWidth)/2;
int vount = (int)((totalWidth - left.getWidth() - right.getWidth())/center.getWidth()) - 3;
XYRect left_edgeH=new XYRect(0, 0, vount, left.getHeight()+2);
//System.out.println("vount = " + vount);
int widthbt = 0;
for(int c=0; c<vount; c++)
{
widthbt = left.getWidth() + (c*center.getWidth()) + 2;
XYRect center_edge=new XYRect(widthbt, 2, center.getWidth(), center.getHeight());
g.drawBitmap(center_edge, center.getBitmap(), 0, 0);
}
XYRect right_edge=new XYRect(widthbt,2, right.getWidth(), right.getHeight());
g.drawBitmap(right_edge, right.getBitmap(), 0, 0);
//invalidate();
//g.drawBitmap(right_edge, right.getBitmap(), 0, 0);
//g.fillRect(left_edge.getWidth(), 0, getPreferredWidth(), getPreferredHeight());
int colorOld = g.getColor();
g.setColor(hColor);
g.drawRoundRect(0, 0, totalWidth-4, left.getHeight()+4, 3, 3);
g.setColor(colorOld);
if(isFocus())
{
g.setColor(util.black);
}
else
{
g.setColor(util.whitebrand);
}
int height = (left.getHeight() - getFont().getHeight())/2;
int width = (totalWidth - getFont().getAdvance("Create An Account"))/2;
g.drawText("Create An Account", width, height);
setExtent(totalWidth + 5,left.getHeight() + 10);
setPosition(0, getFont().getHeight() + 30);
invalidate();
super.paint(g);
}
public int getPreferredHeight() {
return getFont().getHeight() + 20;
}
public int getPreferredWidth() {
return (int)(whiteBgWidth);
}
protected boolean navigationClick(int status, int time) {
removeAllMenuItems();
RegisterScreen registerScreen = new RegisterScreen();
ScreenController screenController = ScreenController.getInstance();
screenController.addNewScreen(registerScreen);
return super.navigationClick(status, time);
}
};
final VerticalFieldManager spaceHolder2 = new VerticalFieldManager(NO_VERTICAL_SCROLL | NO_HORIZONTAL_SCROLL)
{
public void paint(Graphics graphics)
{
graphics.setBackgroundColor(utilNew.ashbrand);
graphics.clear();
super.paint(graphics);
}
public void sublayout(int width, int height){
int w = whiteBgWidth;
super.sublayout(w, (loginButton.getPreferredHeight() * 2) + 40);
setExtent(w, (loginButton.getPreferredHeight() * 2) + 40);
int startX = (int)((Display.getWidth() - whiteBgWidth)/2);
setMargin(new XYEdges(20, 0, 0, startX));
}
};
spaceHolder2.add(loginButton);
spaceHolder2.add(registerButton);
//spaceHolder2.add(registerButton);
spaceHolder1.add(contentHolderPix);
everythingPanel.add(spaceHolder1);
contentHolder1.add(usernameFieldHolder);
contentHolder1.add(passwordFieldHolder);
/*passwordFieldDummyHolder.setFocusListener(new FocusChangeListener(){
public void focusChanged(Field field, int eventType) {
// TODO Auto-generated method stub
if(eventType == FocusChangeListener.FOCUS_GAINED)
{
contentHolder1.replace(passwordFieldDummyHolder, passwordFieldHolder);
}
}
});
passwordFieldHolder.setFocusListener(new FocusChangeListener(){
public void focusChanged(Field field, int eventType) {
// TODO Auto-generated method stub
if(eventType == FocusChangeListener.FOCUS_LOST)
{
System.out.println(">>>>>|>>>" + passwordFieldHolder.getIndex());
System.out.println(">>>>>|>>>" + passwordFieldDummyHolder.getIndex());
if(passwordField.getText().length()==0)
{
System.out.println(">>>>>1>>>");
passwordFieldDummyHolder = utilNew.generateEditTextField(passwordFieldDummy, true, holderPad2, edHt, edWt, false);
contentHolder1.replace(passwordFieldHolder, passwordFieldDummyHolder);
//loginButton.setFocus();
}
System.out.println(">>>>>2>>>");
System.out.println(">>>>>2>>>");
}
}
});*/
everythingPanel.add(contentHolder1);
everythingPanel.add(spaceHolder2);
add(everythingPanel);
}
答案 0 :(得分：0)
我不知道你的问题实际上是什么，但是从你在示例代码中看到的内容很明显，你正在以一种不正确的方式使用UI框架。在继续进行之前，您需要解决这些问题。
以下是一个例子：
final VerticalFieldManager everythingPanel = new VerticalFieldManager(VERTICAL_SCROLL)
{
public void paint(Graphics graphics)
{
graphics.setBackgroundColor(new UtilNew().ashbrand);
graphics.clear();
super.paint(graphics);
}
public void sublayout(int width, int height){
super.sublayout(Display.getWidth(),Display.getHeight());
setExtent(Display.getWidth(), Display.getHeight());
}
};
在这种情况下，您要求父母经理自行解决并给出具体的尺寸。执行此操作时，您需要确保给予父类的大小不大于给定的大小，因此编写类似的代码更为正确：
super.sublayout(Math.min(Display.getWidth(), width),Math.min(Display.getHeight(), height));
这将尝试布置管理器中包含的字段，在您告诉它使用的屏幕空间的范围内（在这种情况下是屏幕的大小）。完成此操作后，它将设置所需的实际大小 - 换句话说，在布局方法结束时，VerticalFieldManager将知道它需要多大并将设置该大小。然后它返回。然后你这样做：
setExtent(Display.getWidth(), Display.getHeight());
现在有一个VerticalFieldManager认为它工作在一定的大小，并且会围绕这个大小优化它的绘画，你可能会给它一个不同的大小。这可能会混淆！
相同的注释也适用于Field的layout（）方法。
换句话说，如果你要让超类布局字段，那么让超类设置大小，否则事情可能会混淆。
这是另一个，实际上更糟糕的例子：
final VerticalFieldManager spaceHolder2 = new VerticalFieldManager(NO_VERTICAL_SCROLL | NO_HORIZONTAL_SCROLL)
{
public void paint(Graphics graphics)
{
graphics.setBackgroundColor(utilNew.ashbrand);
graphics.clear();
super.paint(graphics);
}
public void sublayout(int width, int height){
int w = whiteBgWidth;
super.sublayout(w, (loginButton.getPreferredHeight() * 2) + 40);
setExtent(w, (loginButton.getPreferredHeight() * 2) + 40);
int startX = (int)((Display.getWidth() - whiteBgWidth)/2);
setMargin(new XYEdges(20, 0, 0, startX));
}
};
为什么这会更糟？因为这一行：
setMargin(new XYEdges(20, 0, 0, startX));
请记住，子布局的目的是将所有字段放在屏幕上。你已经调用了super.sublayout（）处理来执行此操作，然后，一旦完成它，你突然说实际上，我想在Field上有一些边距。再次，您可能会混淆处理 - 在布置字段的过程中，您正在更改与放置字段相关的因素之一...
我建议您查看有关创建Managers（以及可能是Fields）的文档，并查看删除任何破坏此过程的代码。为了帮助您进行此调查，我建议您从这里开始：
http://supportforums.blackberry.com/t5/Java-Development/MainScreen-explained/ta-p/606644
然后看看这些：
http://supportforums.blackberry.com/t5/Java-Development/How-to-Extend-the-Screen/ta-p/446745
http://supportforums.blackberry.com/t5/Java-Development/How-to-Extend-the-Screen/ta-p/446745
http://supportforums.blackberry.com/t5/Java-Development/Create-custom-fields/ta-p/444962
你在油漆程序中做了类似的事情。这是一个片段：
public void paint(Graphics g)
{
EncodedImage left;
EncodedImage right;
...
left = EncodedImage.getEncodedImageResource("img/buttons/left.png");
...
setExtent(totalWidth + 5,left.getHeight() + 10);
setPosition(0, getFont().getHeight() + 30);
invalidate();
super.paint(g);
}
paint（）中的一般规则是不要更改Field，只绘制其当前内容。
关于上面给出的paint（）代码，我将评论另外两件事。
1）经常调用paint（）。你真的想最大限度地减少在油漆中完成的处理。因此，每次浏览时都不要创建图像（请参阅上面代码中的左图）。创建一次，然后使用paint绘制（）图像。在油漆中做过多的工作会导致性能问题以及杀死电池。这是您在模拟器上不会注意到的事情，因为它与设备相比速度非常快。
2）请注意，使用invalidate（）时的想法是重新绘制Field。所以没有必要在paint（）中调用invalidate（）。实际上，通过这样做，您将导致无限循环。每次调用paint（）时，你的代码都会使用invalidate（）来要求Field重绘自己，这会导致调用paint（），这会要求一个invalidate（），...你得到了图片！
我已经指出了布局处理和油漆处理中的问题。我并不是说这些问题实际上是直接给你看到的问题。它可能是别的东西。你提供了太多代码供我查看所有寻找针头的代码。如果您希望我们详细查看代码，那么我建议您使用较小的代码示例重新创建问题。事实上，我建议你尝试这样做，因为通过删除代码直到问题消失，你会发现实际导致问题的原因。
最后还有几个要点：
A）在paint（）或paintBackground（）中进行背景绘制之间没有什么区别。事实上，你似乎唯一的背景画是：
graphics.setBackgroundColor(new UtilNew().ashbrand);
graphics.clear();
这在paint（）中绝对没问题，我不打算更改它以使用paintBackground（）或Background类。我对此代码的一个问题是，每次调用paint时都会创建一个新的UtilNew类实例（这很多）。这不会有助于表现。
B）我会避免在滚动更改侦听器中调用Screen.invalidate（），直到您确定没有其他方法可以正确绘制屏幕。如上所述，您提供的内容中还有许多其他可疑代码。在尝试Screen.invalidate（）之前纠正错误。