Question

亲爱的朋友们请帮助我......并且还使用复选框（CheckboxField）点击一些代码来记住用户名（EditField）和密码（PasswordEditField）......

import java.io.IOException;
import java.util.Hashtable;

import net.rim.device.api.system.PersistentObject;
import net.rim.device.api.system.PersistentStore;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.CheckboxField;
import net.rim.device.api.ui.component.EditField;
import net.rim.device.api.ui.component.PasswordEditField;
import net.rim.device.api.ui.container.MainScreen;


public class LoginFormMainScreen extends MainScreen {

    Hashtable persistentHashtable;  
    CheckboxField checkboxField;    
    PersistentObject persistentObject;
    static final long KEY = 0x9df9f961bc6d6baL;
    PasswordEditField passwordField;
    EditField editField;
    ButtonField loginbutton;

    public LoginFormMainScreen() throws IOException {
        setTitle("Persistence Test");
        editField = new EditField("username:", "");
        add(editField);
        passwordField=new PasswordEditField("password:","");
        add(passwordField);

        checkboxField = new CheckboxField("Rememberme", false);
        add(checkboxField);
        add(new ButtonField("Login"));
        persistentObject = PersistentStore.getPersistentObject(KEY);

        if (persistentObject.getContents() == null) {
            persistentHashtable = new Hashtable();
            persistentObject.setContents(persistentHashtable);
        }
        else {
            persistentHashtable = (Hashtable)persistentObject.getContents();
        }

        if (persistentHashtable.containsKey("EditData")) {
            editField.setText((String)persistentHashtable.get("EditData"));
        }


    if (persistentHashtable.containsKey("BoolData")) {
            Boolean booleanObject = (Boolean)persistentHashtable.get("BoolData");
            checkboxField.setChecked(booleanObject.booleanValue());
             if(booleanObject.booleanValue()==true){
                 saveChecked();
             }
            }

    }


    public void saveChecked() throws IOException {
        persistentHashtable.put("", editField.getText());
        persistentHashtable.put("", passwordField.getText());
        persistentHashtable.put("BoolData", new Boolean(checkboxField.getChecked()));
        persistentObject.commit();
    }



}

列出项目

Answer 1

可能是您使用空白键“”将用户名和密码放入哈希表中，但尝试使用“EditData”键检索它。

    static class PersistentHashtable extends Hashtable implements Persistable {
    }

    PersistentHashtable   persistentHashtable;

    public LoginFormMainScreen() throws IOException {

    ...
    if (persistentHashtable.containsKey("userName")) {
        editField.setText((String)persistentHashtable.get("userName"));
    }
    if (persistentHashtable.containsKey("password")) {
        password.setText((String)persistentHashtable.get("password"));
    }
    ...
}

public void saveChecked {
   persitentHashtable.put("userName", editField.getText());
   persitentHashtable.put("password", password.getText());
   persistentHashtable.put("BoolData", new Boolean(checkboxField.getChecked()));
   persistentObject.commit();
}

使用Persistent Store记住用户名和密码

1 个答案: