黑莓：表情中的聊天应用 [英] Blackberry: Emoticons in Chat Application
问题描述
我想打一个聊天应用程序，其中的表情是必要的。我试图写我自己的文本框来处理一些UNI code caracters和微笑和表情符号替换它们，但是这是一个艰苦的工作要做，我遇到了许多问题。
I want to make a chat application where the emoticons are necessary. I was trying to write my own TextBox to handle some unicode caracters and replace them with smiles and emoticons, but that was a hard work to do and I encountered many problems.
然后我试图做出将在它的表情符号自定义字体，但我发现，字体是黑白的，不能着色。
Then I tried to make a custom font that will have emoticons in it but I found that a font is made in black and white and cannot be colored.
我试过，然后使用不同的EditFields所以当我找到一个位图我画，并开始不同的EditField中但几行和选择的问题，没有工作发生。
I tried then to use different EditFields so when I find a Bitmap I draw it and start a different EditField but that didnt work for several lines and selection problems occured.
最好的办法就是写我自己的文本框，将找到一个特别的UNI code卡拉科特，加2个空格来，得到了UNI code卡拉科特的位置，然后绘制位图图像在这个位置。但是，这是非常缓慢的时候表情的数量变得更大
The best way was to write my own textField that will find a special unicode caracter, add 2 spaces to, get the location of the unicode caracter and then draw the bitmap image in this location. But that was very slow when the number of emoticons becomes bigger
是否有工具或API还是有办法，我错过了，会做的表情，我在BlackBerry设备上？请这个话题我到处找，没有什么发现，但在帮助
Is there a tool or an API or a way that I missed that will do the emoticons for me on BlackBerry devices? Please help in this topic I searched everywhere and nothing found yet
推荐答案
我们可以尝试使用一个网络论坛的方法：
We could try to use a web forums approach:
- 允许用户输入ASCII codeS的表情符号
- 在消息编辑模式下显示的表情符号作为文本codeS
- 在消息历史记录中显示表情符号为图像（使用<一个href=\"http://www.blackberry.com/developers/docs/5.0.0api/net/rim/device/api/browser/field2/BrowserField.html\"相对=nofollow> BrowserField 为此）
- 使用额外的HTML格式
试试这个code：
public final class ChatScreen extends MainScreen implements FieldChangeListener {
static final int INT_MSG_MAX_LEN = 200;
static final DateFormat FRMT_TIME = DateFormat
.getInstance(DateFormat.TIME_SHORT);
static final String STR_FRMT_IMG = "<img src=\"{0}\"></img>";
static final String STR_FRMT_MSG = "<b>{0}</b> [{1}]: {2}</p>";
// several emoticon ASCII codes
static final String STR_CODE_SMILE = ":)";
static final String STR_CODE_SADSMILE = ":(";
static final String STR_CODE_WINK = ";)";
// use emoticons from http://www.skypeemoticonslist.com
static final String STR_IMG_URL = "http://www.skypeemoticonslist.com/images/";
static final String STR_IMG_NAME_SMILE = "emoticon-0100-smile.png";
static final String STR_IMG_NAME_SADSMILE = "emoticon-0101-sadsmile.png";
static final String STR_IMG_NAME_WINK = "emoticon-0105-wink.png";
static final Hashtable TABLE_URL = new Hashtable();
static final Hashtable TABLE_IMG = new Hashtable();
private static void initCode(String code, String imgFName) {
String tag;
// prepare table for online use
// generate img tag with live url
tag = MessageFormat.format(STR_FRMT_IMG, new Object[] { STR_IMG_URL
+ imgFName });
TABLE_URL.put(code, tag);
// prepare table for offline use
// retrieve image from project resources
try {
EncodedImage img = EncodedImage.getEncodedImageResource(imgFName);
// generate img tag with embedded data url
String dataStr = getDataUrl(img.getData(), img.getMIMEType());
tag = MessageFormat.format(STR_FRMT_IMG, new Object[] { dataStr });
TABLE_IMG.put(code, tag);
} catch (IOException e) {
System.out.println("\n Troubles preparing res for code " + code
+ " \n");
}
}
static {
initCode(STR_CODE_SMILE, STR_IMG_NAME_SMILE);
initCode(STR_CODE_SADSMILE, STR_IMG_NAME_SADSMILE);
initCode(STR_CODE_WINK, STR_IMG_NAME_WINK);
}
boolean mIsOffline = true;
String mChatHistory = "";
BrowserField mBrowserField = new BrowserField();
EditField mTextField = new EditField("Input message: ", "",
INT_MSG_MAX_LEN, Field.USE_ALL_WIDTH);
ButtonField mBtnUserLeft = new ButtonField("Send as Mr. Left",
Field.FIELD_LEFT | ButtonField.CONSUME_CLICK);
ButtonField mBtnUserRight = new ButtonField("Send as Mr. Right",
Field.FIELD_RIGHT | ButtonField.CONSUME_CLICK);
public ChatScreen() {
super(Manager.NO_VERTICAL_SCROLL | Manager.NO_HORIZONTAL_SCROLLBAR);
add(mTextField);
HorizontalFieldManager hfm = new HorizontalFieldManager(
Field.USE_ALL_WIDTH | Field.FIELD_HCENTER);
mBtnUserLeft.setChangeListener(this);
mBtnUserRight.setChangeListener(this);
hfm.add(mBtnUserLeft);
hfm.add(mBtnUserRight);
add(hfm);
VerticalFieldManager vfm = new VerticalFieldManager(Field.USE_ALL_WIDTH
| Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR);
vfm.add(mBrowserField);
add(vfm);
}
protected void makeMenu(Menu menu, int instance) {
menu.add(new MenuItem(mIsOffline ? "Go Online" : "Go Offline", 0, 0) {
public void run() {
mIsOffline = !mIsOffline;
}
});
super.makeMenu(menu, instance);
}
public void fieldChanged(final Field field, int context) {
if (field == mBtnUserLeft) {
addMessage("Mr. Left");
} else if (field == mBtnUserRight) {
addMessage("Mr. Right");
}
}
private void addMessage(String userName) {
String message = mTextField.getText();
// update message with emoticons
message = replaceCodeWithImg(message, STR_CODE_SMILE);
message = replaceCodeWithImg(message, STR_CODE_SADSMILE);
message = replaceCodeWithImg(message, STR_CODE_WINK);
String timeStr = FRMT_TIME.format(new Date(System.currentTimeMillis()));
String text = MessageFormat.format(STR_FRMT_MSG, new Object[] {
userName, timeStr, message });
mChatHistory = text + mChatHistory;
mTextField.setText("");
// fix IllegalStateException up to
// http://supportforums.blackberry.com/t5/Java-Development/IllegalStateException-at-displayContent-on-browserfield/td-p/1071991
mBrowserField.setFocus();
mBrowserField.displayContent("<html>" + mChatHistory + "</html>", "");
}
private String replaceCodeWithImg(String message, String code) {
Hashtable table = mIsOffline ? TABLE_IMG : TABLE_URL;
int index = message.indexOf(code);
while (index != -1) {
String begin = message.substring(0, index);
String end = message.substring(index + code.length());
String tag = (String) table.get(code);
message = begin + tag + end;
index = message.indexOf(code, index + tag.length());
}
return message;
}
// src taken from http://bfo.com/blog/files/src/DataStreamHandler.java
private static final String getDataUrl(byte[] data, String mimetype)
throws IOException {
final StringBuffer sb = new StringBuffer();
sb.append("data:");
sb.append(mimetype);
sb.append(";base64,");
OutputStream out = new OutputStream() {
public void write(int c) {
sb.append((char) (c & 0xFF));
}
};
Base64OutputStream fout = new Base64OutputStream(out);
fout.write(data);
fout.close();
return sb.toString();
}
}
这篇关于黑莓：表情中的聊天应用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
