我有一个类继承Canvas，做成全屏的，但我要在这个类中能接收用户输入文字，要怎么做啊？高手指点一二。谢谢
或者说怎么能把一个textbox放到Canvas上
如果你要输入英文和数字，自己写输入法
如果是中文，不可能~~
同意楼上的
xueyong1203(二当家的) ,能说说怎么写吗？
另外，Form能不能全屏呀,如果能的话，我用form代替canvas
自己写的意思说白了就是在canvas上画一个textbox,在按键响应中捕获按键,在画到相应的区域
yanhan0615(炮炮)
问题就是在按键响应中捕获按键中，因为一个键对应很多字符，
用一张包含你所有需要输入的字母和数字的图片,然后通过在图片上选择字母来输入.现在很多游戏,包括PC(当然PC大部分只是为了输入效果)都这样来做.
好象只有Sharp的个别型号支持输入中文，其他所有的手机都不支持
nokia支持全屏 fullcanvas 现在2.0也支持了吧
那你做的跟手机上一样就可以了,按键有一个延迟,如果在很短的时间(自己定义)内按的话是几个字符轮流跳动
自己做了一个能在canvas下接收输入的textbox，贴出来和大家共享一下，其中主要是参考了网上的代码，这个代码可以从这里下载http://www.cnblogs.com/Files/zhengyun_ustc/BloglinesMobile-src.rar。
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
public class MyTextBox extends Canvas implements Runnable{
private final static int KEY_CLEAR = -8;
private final static int MAX_NUM = 10;
private final static int KEY_LEFT = -3;
private final static int KEY_RIGHT = -4;
private char[] m_text = new char[10];
private int currentCursor = 0;
private int previouseCursor = 0;
private int currentKey = -1;
private int keyStatus = 0;
private int offPos = 0;
private int currentLen = 0;
private boolean showCursor = true;
private int left;
private int top;
final static protected char[][] CHAR_OPTIONS = {
{'0', '+'},
{'1', '.', '-', '\'', '+', '!', '\"', '*', '#', '$', '%', '(', ')', '@', '&', '_',
'~', '`', '^', '=', '\\', '|', ',', '/', '?', '<', '>', ':', ';', '[', ']'},
{'A', 'B', 'C', 'a', 'b', 'c', '2'},
{'D', 'E', 'F', 'd', 'e', 'f', '3'},
{'G', 'H', 'I', 'g', 'h', 'i', '4'},
{'J', 'K', 'L', 'j', 'k', 'l', '5'},
{'M', 'N', 'O', 'm', 'n', 'o', '6'},
{'P', 'Q', 'R', 'S', 'p', 'q', 'r', 's', '7'},
{'T', 'U', 'V', 't', 'u', 'v', '8'},
{'W', 'X', 'Y', 'Z', 'w', 'x', 'y', 'z', '9'},
{' '}
};
final static protected int[] KEY_OPTIONS = {
KEY_NUM0, KEY_NUM1, KEY_NUM2, KEY_NUM3,
KEY_NUM4, KEY_NUM5, KEY_NUM6, KEY_NUM7,
KEY_NUM8, KEY_NUM9, KEY_POUND
};
public MyTextBox(int left,int top){
this.left = left;
this.top = top;
for(int i = 0; i < 10; i++){
m_text[i] = '\0';
}
}
protected void paint(Graphics g) {
g.setColor(255,255,255);
g.fillRect(left,top,112,20);
drawBox(g);
drawChar(g);
if(showCursor)
drawCursor(g);
}
private void drawBox(Graphics g){
g.setColor(0,0,0);
g.drawRect(left,top,110,18);
}
private void drawChar(Graphics g){
int lt = left + 4;
int tp = top + 2;
g.setColor(0,0,255);
Font font = Font.getFont(Font.FACE_SYSTEM,Font.STYLE_PLAIN ,Font.SIZE_MEDIUM);
g.setFont(font);
int fw ;
for(int i = 0; i < 10; i++){
if(m_text[i] == '\0')
break;
fw = font.stringWidth(m_text[i] + "");
//System.out.println(fw + "," + m_text[i]);
g.drawString(m_text[i] + "",lt ,tp,Graphics.LEFT | Graphics.TOP);
lt = lt + fw + 2;
}
}
private void drawCursor(Graphics g){
Font font = Font.getFont(Font.FACE_SYSTEM,Font.STYLE_PLAIN ,Font.SIZE_MEDIUM);
int lt = left + 4;
g.setColor(0,0,255);
for(int i = 0; i < currentCursor; i++){
lt = lt + font.stringWidth(m_text[i] + "") + 2;
}
lt = lt -2;
g.drawLine(lt,top + 4,lt,top + 15);
}
private void rightCursor(){
if(currentCursor >= currentLen) return;
currentCursor++;
currentKey = -1;
}
private void leftCursor(){
if(currentCursor <= 0) return;
currentCursor--;
currentKey = -1;
}
private void deleteChar(){
if(currentCursor <= 0) return;
if(currentCursor > currentLen ) return ;
System.arraycopy(m_text,currentCursor ,m_text,currentCursor -1,currentLen - currentCursor);
m_text[currentLen - 1] = '\0';
currentLen--;
currentCursor--;
if(currentCursor < 0) currentCursor = 0;
if(currentLen < 0) currentLen = 0;
}
private void insertChar(char ch,boolean mode){
//System.out.println("mode="+mode);
if(mode){
if(currentLen >= MAX_NUM) return;
System.arraycopy(m_text,currentCursor,m_text,currentCursor + 1,currentLen - currentCursor);
m_text[currentCursor] = ch;
previouseCursor = currentCursor;
currentCursor++;
currentLen++;
}else{
m_text[previouseCursor ] = ch;
}
}
protected int getKeyOption(int keyCode) {
//System.out.println("getKeyOption>>" + keyCode);
int l = KEY_OPTIONS.length;
for (int keyIndex = 0; keyIndex < l; keyIndex++) {
if (KEY_OPTIONS[keyIndex] == keyCode) return keyIndex;
}
return -1;
}
private char getKeyCodeChar(int keyCode,boolean mode){
int keyIndex = getKeyOption(keyCode);
if(keyIndex == -1) return '\0';
if(mode){
offPos++;
int len = CHAR_OPTIONS[keyIndex].length;
if(offPos >= len) offPos %= len;
}else{
offPos = 0;
}
char ch = CHAR_OPTIONS[keyIndex][offPos];
return ch;
}
public void run() {
while(true){
try{
Thread.sleep(500);
showCursor = !showCursor;
}catch(Exception ex){
}
synchronized(this){
keyStatus++;
}
repaint();
}
}
public void keyPressed(int keyCode){
switch(keyCode){
case KEY_LEFT:
leftCursor();
break;
case KEY_RIGHT:
rightCursor();
break;
case KEY_CLEAR:
deleteChar();
break;
case KEY_NUM0:
case KEY_NUM1:
case KEY_NUM2:
case KEY_NUM3:
case KEY_NUM4:
case KEY_NUM5:
case KEY_NUM6:
case KEY_NUM7:
case KEY_NUM8:
case KEY_NUM9:
boolean b;
//System.out.println(currentKey+","+keyStatus);
if(currentKey == keyCode && keyStatus <= 1){
b = true;
}else{
if(currentLen >= MAX_NUM){
return;
}
b = false;
}
char ch = getKeyCodeChar(keyCode,b);
insertChar(ch,!b);
synchronized(this){
keyStatus = 0;
}
break;
}
repaint();
currentKey = keyCode;
}
}
对于楼主的精神,赞一个,收下了
发现bug的话，别忘了告诉我
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