本文介绍了如何获取/设置另一个类的变量?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我需要将IP和端口转移到MyCanvasClass上，或者在Canvas启动时以某种方式获取它.
请帮忙.
MyMidlet.java的内容:
I need to transfer IP and Port to MyCanvasClass or somehow get it when Canvas starting.
Please, help.
Contents of MyMidlet.java:
package pak;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class MyMidlet extends MIDlet implements CommandListener{
private Command exitCommand;
private Command connectCommand;
public Form form;
private TextField textField;
private TextField textField1;
MyCanvas myCanvas = new MyCanvas(this);
public void startApp() {
getDisplay().setCurrent(getForm());
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public Display getDisplay () {
return Display.getDisplay(this);
}
public Form getForm(){
form = new Form("My Form", new Item[] { getTextField(), getTextField1() });
form.addCommand(getExitCommand());
form.addCommand(getConnectCommand());
form.setCommandListener(this);
return form;
}
public Command getExitCommand() {
if (exitCommand == null) {
// write pre-init user code here
exitCommand = new Command("Exit", Command.EXIT, 0);
// write post-init user code here
}
return exitCommand;
}
public Command getConnectCommand() {
if (connectCommand == null) {
// write pre-init user code here
connectCommand = new Command("Connect", Command.ITEM, 0);
// write post-init user code here
}
return connectCommand;
}
public void commandAction(Command c, Displayable d) {
if (d == form) {
if (c == exitCommand) {
exitMIDlet() ;
}
else{
if(c == connectCommand){
//ip = textField.getString();
//port = textField1.getString();
//myCanvas.start();
//getDisplay().setCurrent(myCanvas);
}
}
}
}
public void exitMIDlet() {
switchDisplayable (null, null);
destroyApp(true);
notifyDestroyed();
}
public void switchDisplayable(Alert alert, Displayable nextDisplayable) {
// write pre-switch user code here
Display display = getDisplay();
if (alert == null) {
display.setCurrent(nextDisplayable);
} else {
display.setCurrent(alert, nextDisplayable);
}
// write post-switch user code here
}
public TextField getTextField() {
if (textField == null) {
// write pre-init user code here
textField = new TextField("IP", null, 15, TextField.ANY);
textField.setInitialInputMode("UCB_BASIC_LATIN");
// write post-init user code here
}
return textField;
}
public TextField getTextField1() {
if (textField1 == null) {
// write pre-init user code here
textField1 = new TextField("Port", null, 16, TextField.NUMERIC);
// write post-init user code here
}
return textField1;
}
}
MyCanvas.java的内容:
Contents of MyCanvas.java:
package pak;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.*;
///////
class MyCanvas extends GameCanvas implements Runnable{
MyMidlet midlet;
public String ip;
public String port;// i know that need INT, but now it''s doesn''t matter
private boolean isRunning = true;
private Graphics g;
public MyCanvas(MyMidlet midlet){
super(true);
this.midlet = midlet;
}
public void start(){
Thread runner = new Thread(this);
runner.start();
}
public void run(){
Connect();
int iKey = 0;
while (isRunning) {
iKey = getKeyStates();
if ((iKey & GameCanvas.FIRE_PRESSED) != 0)
{
midlet.getDisplay().setCurrent(midlet.getForm());
}
try{
Thread.sleep(30);
}
catch(Exception ex){}
}
}
public void Connect()
{
///using ip and port
}
}推荐答案
package pak;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.GameCanvas;
public class MyMidlet extends MIDlet implements CommandListener{
public String ip;
public String port;
private Command exitCommand;
private Command connectCommand;
public Form form;
private TextField textField;
private TextField textField1;
MyCanvas myCanvas = new MyCanvas(this);
public void startApp() {
getDisplay().setCurrent(getForm());
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public Display getDisplay () {
return Display.getDisplay(this);
}
public Form getForm(){
form = new Form("My Form", new Item[] { getTextField(), getTextField1() });
form.addCommand(getExitCommand());
form.addCommand(getConnectCommand());
form.setCommandListener(this);
return form;
}
public Command getExitCommand() {
if (exitCommand == null) {
// write pre-init user code here
exitCommand = new Command("Exit", Command.EXIT, 0);
// write post-init user code here
}
return exitCommand;
}
public Command getConnectCommand() {
if (connectCommand == null) {
// write pre-init user code here
connectCommand = new Command("Connect", Command.ITEM, 0);
// write post-init user code here
}
return connectCommand;
}
public void commandAction(Command c, Displayable d) {
if (d == form) {
if (c == exitCommand) {
exitMIDlet() ;
}
else{
if(c == connectCommand){
ip = textField.getString();
port = textField1.getString();
myCanvas.start();
getDisplay().setCurrent(myCanvas);
}
}
}
}
public void exitMIDlet() {
switchDisplayable (null, null);
destroyApp(true);
notifyDestroyed();
}
public void switchDisplayable(Alert alert, Displayable nextDisplayable) {
// write pre-switch user code here
Display display = getDisplay();
if (alert == null) {
display.setCurrent(nextDisplayable);
} else {
display.setCurrent(alert, nextDisplayable);
}
// write post-switch user code here
}
public TextField getTextField() {
if (textField == null) {
// write pre-init user code here
textField = new TextField("IP", null, 15, TextField.ANY);
textField.setInitialInputMode("UCB_BASIC_LATIN");
// write post-init user code here
}
return textField;
}
public TextField getTextField1() {
if (textField1 == null) {
// write pre-init user code here
textField1 = new TextField("Port", null, 16, TextField.NUMERIC);
// write post-init user code here
}
return textField1;
}
class MyCanvas extends GameCanvas implements Runnable{
MyMidlet midlet;
private boolean isRunning = true;
private Graphics g;
public MyCanvas(MyMidlet midlet){
super(true);
this.midlet = midlet;
}
public void start(){
Thread runner = new Thread(this);
runner.start();
}
public void run(){
g = getGraphics();
Connect();
int iKey = 0;
while (isRunning) {
iKey = getKeyStates();
if ((iKey & GameCanvas.FIRE_PRESSED) != 0)
{
midlet.getDisplay().setCurrent(midlet.getForm());
}
try{
Thread.sleep(30);
}
catch(Exception ex){}
}
}
public void Connect()
{
///using ip and port
g.setColor(10, 20, 30);
g.drawString("IP:" + ip + "Port:" + port ,0 , 0, 20);
flushGraphics();
}
}
}
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