Will的部落格

此範例為使用checkBox紀錄使用者登入之帳號密碼相關資訊,

google了許多範例都閹割了一些必要功能,

例如重新開啟app後rememberMe功能就失效之類等等,

重新reWork測試後為功能較完整的一份code如下所示

Xml布局檔

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.escanui.UserInfoActivity" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/textView1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="IP:"
                android:textAppearance="?android:attr/textAppearanceLarge" />

            <MultiAutoCompleteTextView
                android:id="@+id/multiAutoCompleteTextView1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:ems="10"
                android:hint="type your IP address" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/textView2"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Username:"
                android:textAppearance="?android:attr/textAppearanceLarge" />

            <MultiAutoCompleteTextView
                android:id="@+id/multiAutoCompleteTextView2"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:ems="10"
                android:hint="type your user ID" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/textView3"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Password:"
                android:textAppearance="?android:attr/textAppearanceLarge" />

            <EditText
                android:id="@+id/editPassword1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:ems="10"
                android:hint="type your user password"
                android:inputType="textPassword" >

                <requestFocus />
            </EditText>
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/textView4"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Data path:"
                android:textAppearance="?android:attr/textAppearanceLarge" />

            <AutoCompleteTextView
                android:id="@+id/autoCompleteTextView5"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:ems="10"
                android:hint="type file path" />

        </LinearLayout>

        <Button
            android:id="@+id/loginButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Confirm" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <CheckBox
                android:id="@+id/checkBox1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="remeber me" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

MainActivity.java

package com.example.remeberme;  
import android.app.Activity;  
import android.content.SharedPreferences;  
import android.os.Bundle;  
import android.widget.CheckBox;  
import android.widget.CompoundButton;  
import android.widget.EditText;  
public class MainActivity extends Activity {  
 
    private final String PREFERENCES_NAME = "userinfo";  
    private EditText username,password;  
    private CheckBox cbRemember;  
      
    private String userName,passWord;   
    private Boolean isRemember = false;  
      
    /** Called when the activity is first created. */      @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
        initializeViews();  
          
        SharedPreferences preferences = 
        getSharedPreferences(PREFERENCES_NAME, Activity.MODE_PRIVATE);  
        username.setText(preferences.getString("UserName", null));  
        cbRemember.setChecked(preferences.getBoolean("Remember", true));  
        if(cbRemember.isChecked()){  
            password.setText(preferences.getString("PassWord", null));  
        }else{  
            password.setText(null);  
        }  
    }  
      
    /** 
     * 初始化UI控件 
.    */  
    private void initializeViews(){  
        username = (EditText)findViewById(R.id.username);  
        password = (EditText)findViewById(R.id.password);  
          
        cbRemember = (CheckBox)findViewById(R.id.ischecked);  
        cbRemember.setOnCheckedChangeListener
        (new CompoundButton.OnCheckedChangeListener()

        {      
            @Override  
            public void onCheckedChanged
            (CompoundButton buttonView, boolean isChecked) {  
                isRemember = isChecked;  
            }  
        });  
    }  
    @Override  
    public void onStop() {  
        super.onStop();  
        SharedPreferences agPreferences = 
        getSharedPreferences(PREFERENCES_NAME, Activity.MODE_PRIVATE);  
        SharedPreferences.Editor editor =
        agPreferences.edit();  
          
        userName = username.getText().toString();  
        passWord = password.getText().toString();  
        editor.putString("UserName", userName);  
        editor.putString("PassWord", passWord);  
        editor.putBoolean("Remember", isRemember);  
        editor.commit();  
    }     
}