我正在创建一个 BlackBerry 应用程序，现在我想在单击图像按钮时呈现动画。在我的应用程序中，我使用启动画面，然后显示登录页面。当我点击我的登录页面的提交按钮时，会显示一个主屏幕，我想在那里显示一个幻灯片动画。
这是我的代码：
public class LoginPage extends MainScreen implements FieldChangeListener {
public TextField tf_username;
public TextField tf_password;
private Bitmap[] img1;
public LabelField labeluser;
public LabelField labelpass;
public static String strUsername = "";
public static String strPassword = "";
public CheckboxField objRemembercheckbox;
private ImageButton btn_login;
private ImageButton btn_clear;
public BitmapField loading = new BitmapField(Bitmap.getBitmapResource("login-bar.png"));
public H_FieldManager hfm_btn;
public VerticalFieldManager vfm_user, vfm_pass;
public PleaseWaitPopupScreen waitPopupScreen = null;
public VerticalFieldManager vfmMainManager;
public static boolean loginFlag = false;
public static boolean flagOutletButton;
public RecordStore objLoginRecordStore;
private String login_record_Store_Name = "LoginRMS";
public LoginPage() { // TODO Auto-generated constructor stub super(USE_ALL_WIDTH | USE_ALL_HEIGHT); setTitle(loading);
try {
Background bg = BackgroundFactory.createSolidTransparentBackground(
Color.BLUE, 100); getMainManager().setBackground(bg);
} catch (Exception e) { // TODO: handle exception }
labeluser = new LabelField("Enter Username : ", Field.FIELD_LEFT); labeluser.setMargin(10, 0, 0, 10); labeluser.setColor(Color.BLACK);
tf_username = new TextField(TextField.TYPE_PLAIN, Field.FIELD_HCENTER);
labelpass = new LabelField("Enter Password : ", Field.FIELD_LEFT); labelpass.setMargin(10, 0, 0, 10); labelpass.setColor(Color.BLACK);
tf_password = new TextField(TextField.TYPE_PASSWORD,
Field.FIELD_HCENTER);
objRemembercheckbox = new CheckboxField("Remember Me", false); objRemembercheckbox.setMargin(10, 0, 0, 10);
img1 = new Bitmap[3]; img1[0] = Bitmap.getBitmapResource("btn-hover.png"); img1[1] = Bitmap.getBitmapResource("btn.png"); img1[2] = Bitmap.getBitmapResource("btn.png");
btn_login = new ImageButton(img1, "Login", Field.FIELD_LEFT); btn_login.setColor(Color.WHITE); btn_clear = new ImageButton(img1, "Clear", Field.FIELD_RIGHT); btn_clear.setColor(Color.WHITE);
hfm_btn = new H_FieldManager(btn_login, btn_clear, true,
Field.FIELD_HCENTER); vfm_user = new VerticalFieldManager(); vfm_user.add(labeluser); vfm_user.add(tf_username);
vfm_pass = new VerticalFieldManager(); vfm_pass.add(labelpass); vfm_pass.add(tf_password); add(vfm_user); add(vfm_pass); add(objRemembercheckbox); add(hfm_btn);
btn_login.setChangeListener(this); btn_clear.setChangeListener(this);
}
public void fieldChanged(Field field, int context) { // TODO Auto-generated method stub if (field == btn_clear) { tf_username.setText(" "); tf_password.setText(" ");
} else if (field == btn_login) { login(); }
}
public void login() {
try {
LoginPage.strUsername = tf_username.getText().toString(); System.out.println("strUsername==" + strUsername); LoginPage.strPassword = tf_password.getText().toString(); System.out.println("strPassword==" + strPassword);
if (strUsername.length() == 0 || strPassword.length() == 0
|| strUsername == null || strPassword == null) {
Dialog.alert("You must enter credentials");
invalidate(); } else {
// strUsername=username.getText();
// strPassword=password.getText();
try {
waitPopupScreen = new PleaseWaitPopupScreen("Please wait..");
UiApplication.getUiApplication()
.pushScreen(waitPopupScreen);
new Thread() {
public void run() {
ConnectToServer objConnectToServer = new ConnectToServer();
loginFlag = objConnectToServer.loginCheck(
strUsername, strPassword);
UiApplication.getUiApplication().invokeLater(
new Runnable() {
public void run() {
UiApplication.getUiApplication()
.popScreen(waitPopupScreen);
if (loginFlag == true) {
LoginPage.flagOutletButton = false;
System.out
.println("Calling getOutletInfo");
HomeScreen objHome= new HomeScreen ();
UiApplication
.getUiApplication()
.pushScreen(objHome);
}
else {
Dialog.alert("Username Or Password Is Incorrect");
}
}
});
};
}.start();
// ConnectToServer objConnectToServer=new ConnectToServer();
//
// loginFlag=objConnectToServer.loginCheck(strUsername,
// strPassword);
System.out.println("loginFlag==" + loginFlag);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
} catch (Exception e) { // TODO: handle exception e.printStackTrace(); }
}
}
请建议如何实现幻灯片动画。
谢谢你。