Question

J2ME怎么让TextField全屏像TextBox显示?

代码如下，我要让TextField全屏，不是用TextBox!!!
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class a extends MIDlet {
private Display display;
private Form messForm=new Form("请输入短信");
private TextField mtf=new TextField("","",255,TextField.ANY);
public a() {
display=Display.getDisplay(this);
display.setCurrent(messForm);
messForm.append(mtf);
mtf.setLayout(TextField.LAYOUT_EXPAND);

}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
// TODO Auto-generated method stub

}

protected void pauseApp() {
// TODO Auto-generated method stub

}

protected void startApp() throws MIDletStateChangeException {
// TODO Auto-generated method stub

}

}
mtf.setLayout(TextField.LAYOUT_EXPAND);
这段不是设置TextField的样式吗，我知道还有个方法叫setPreferredSize(int width, int height) 的方法，用后一个方法我试过了，可以调整TextField的大小，但是我就是不死心啊，开发的API上明明写着Item类里有个叫setLayout(int layout) 的方法啊，TextField是Item类的子类啊，为什么调用没有反应啊，救命啊~~~~谁能告诉我setLayout(int layout)怎么用啊？

Answer 1

这样添加设置一下就行了，具体意思我也不好解释， textField1.setLayout(Item.LAYOUT_CENTER|Item.LAYOUT_NEWLINE_AFTER|Item.LAYOUT_NEWLINE_BEFORE);
textField1.setPreferredSize(form1.getWidth(), form1.getHeight());

我也在学习J2ME，可以交流一下，分享一些文档资料什么的呵呵！

Answer 2

看一下下面的TextBox源码，你可能就知道了它是SUN公司开发的
package javax.microedition.lcdui;

// Referenced classes of package javax.microedition.lcdui:
// Screen, Form, TextField, Display,
// Ticker, Item, Graphics

public class TextBox extends Screen
{

private Form form;
private TextField textField;

public TextBox(String title, String text, int maxSize, int constraints)
{
super(title);
synchronized (Display.LCDUILock)
{
form = new Form(title);
form.paintDelegate = this;
if ((0x20000 & constraints) == 0x20000)
form.paintBorder = 2;
else
form.paintBorder = 1;
textField = new TextField(null, text, maxSize, constraints);
textField.setBorder(false);
form.append(textField);
}
}

public String getString()
{
return textField.getString();
}

public void setString(String text)
{
textField.setString(text);
}

public int getChars(char data[])
{
return textField.getChars(data);
}

public void setChars(char data[], int offset, int length)
{
textField.setChars(data, offset, length);
}

public void insert(String src, int position)
{
textField.insert(src, position);
}

public void insert(char data[], int offset, int length, int position)
{
textField.insert(data, offset, length, position);
}

public void delete(int offset, int length)
{
textField.delete(offset, length);
}

public int getMaxSize()
{
return textField.getMaxSize();
}

public int setMaxSize(int maxSize)
{
return textField.setMaxSize(maxSize);
}

public int size()
{
return textField.size();
}

public int getCaretPosition()
{
return textField.getCaretPosition();
}

public void setConstraints(int constraints)
{
textField.setConstraints(constraints);
}

public int getConstraints()
{
return textField.getConstraints();
}

public void setInitialInputMode(String characterSubset)
{
textField.setInitialInputMode(characterSubset);
}

public void setTitle(String s)
{
super.setTitle(s);
form.setTitle(s);
}

public void setTicker(Ticker ticker)
{
super.setTicker(ticker);
form.setTicker(ticker);
}

void commitPendingInteraction()
{
textField.commitPendingInteraction();
}

void callShowNotify(Display d)
{
super.callShowNotify(d);
form.callShowNotify(d);
}

void callHideNotify(Display d)
{
super.callHideNotify(d);
form.callHideNotify(d);
}

void callInvalidate(Item src)
{
form.callInvalidate(src);
}

void callItemStateChanged(Item src)
{
form.callItemStateChanged(src);
}

void callKeyPressed(int keyCode)
{
form.callKeyPressed(keyCode);
}

void callKeyReleased(int keyCode)
{
form.callKeyReleased(keyCode);
}

void callKeyRepeated(int keyCode)
{
form.callKeyRepeated(keyCode);
}

void callKeyTyped(char keyCode)
{
form.callKeyTyped(keyCode);
}

void callPaint(Graphics g, Object target)
{
form.callPaint(g, target);
}
}