黑莓：聊天應用中的表情圖標

Question

我想製作一個需要表情圖標的聊天應用程序。我試圖編寫我自己的TextBox來處理一些unicode字符，並用微笑和表情符號替換它們，但這是一項艱鉅的工作，我遇到了許多問題。

然後我試圖做的是將在它的表情符號自定義字體，但我發現，字體是黑白的，不能着色。

我試圖然後使用不同的EditFields所以當我找到一個位圖我畫，並開始不同的EditField中，但幾行發生和選擇問題沒有工作。

最好的方法是編寫我自己的textField，它將找到一個特殊的unicode caracter，添加2個空格，獲取unicode caracter的位置，然後在該位置繪製位圖圖像。但是，這時候的表情符號的數量變得更大

是否有工具或API還是有辦法，我錯過了，會做的表情對我來說BlackBerry設備上的很慢？請這個話題我到處搜尋，並沒有發現尚未

在幫助

Answer 1

我們可以嘗試使用一個網絡論壇的方法：

• 允許用戶爲表情符號輸入ASCII碼
在消息編輯模式下顯示錶情
• 爲文本代碼
• 在消息歷史記錄中顯示錶情的圖像（使用BrowserField用於此目的）
• 使用額外的HTML格式

試試這個代碼：在Java發展論壇RIM

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(); 
    } 
}