我编写了一个简单BorderedEditField
的扩展类EditField
。protected boolean keyChar(char key, int status, int time)
此类的方法被修改,以便可以操纵EditField
的默认行为。如果您发现此示例有帮助,那么您可以改进实现。
import net.rim.device.api.system.Characters;
import net.rim.device.api.ui.component.EditField;
import net.rim.device.api.ui.container.MainScreen;
public final class MyScreen extends MainScreen {
public MyScreen() {
BorderedEditField ef = new BorderedEditField();
ef.setLabel("Label: ");
add(ef);
}
}
class BorderedEditField extends EditField {
private static final int MAX_LENGTH = 13;
private static final int MAX_LENGTH_EXCEPTION = 16;
private static final char SPECIAL_CHAR = ',';
protected boolean keyChar(char key, int status, int time) {
// Need to add more rules here according to your need.
if (key == Characters.DELETE || key == Characters.BACKSPACE) {
return super.keyChar(key, status, time);
}
int curTextLength = getText().length();
if (curTextLength < MAX_LENGTH) {
return super.keyChar(key, status, time);
}
if (curTextLength == MAX_LENGTH) {
char spChar = getText().charAt(MAX_LENGTH - 1);
return (spChar == SPECIAL_CHAR) ? super.keyChar(key, status, time) : false;
}
if (curTextLength > MAX_LENGTH && curTextLength < MAX_LENGTH_EXCEPTION) {
return super.keyChar(key, status, time);
} else {
return false;
}
}
}