Android SharedPreference配合checkBox完成用戶名和密碼保存

package com.windvally.sharedpreferencestest;

import com.windvally.datasavefile.R;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.TextView;

public class SharedPreferencesTest extends Activity {
 private EditText username_ET, password_ET;
 private String username, password, lastusername_input, result = "";
 private Button loginButton;
 private CheckBox rem_username_CB, rem_password_CB, auto_login_CB;
 private boolean if_rem_username, if_rem_password, if_auto_login;
 private SharedPreferences lastusername, saveuserinfo;
 private TextView resultTV;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_shared_preferences_test);
  username_ET = (EditText) findViewById(R.id.username);
  password_ET = (EditText) findViewById(R.id.password);
  loginButton = (Button) findViewById(R.id.login);
  rem_username_CB = (CheckBox) findViewById(R.id.rem_user);
  rem_password_CB = (CheckBox) findViewById(R.id.rem_psw);
  auto_login_CB = (CheckBox) findViewById(R.id.auto_login);
  resultTV = (TextView) findViewById(R.id.result);
  //首先，檢查sharedpreference裏保存的最後一次登錄的用戶名，根據用戶名檢查該用戶保存的用戶名密碼和三個checkbox的狀態來完成初始化。
  
  init();
  //初始化完成判斷是否自動登錄。如自動登錄被選中，則開始自動登錄。
  check_autolog_selected();
  
  //添加用戶名輸入框的輸入字符的事件
  username_ET.addTextChangedListener(new TextWatcher() {

   @Override
   public void onTextChanged(CharSequence s, int start, int before,
     int count) {
    // TODO Auto-generated method stub
    
    String temp_username = username_ET.getText().toString().trim();
    saveuserinfo = getSharedPreferences(temp_username, 0);
    password = saveuserinfo.getString("password", "");
    if_rem_username = saveuserinfo
      .getBoolean("rem_username", false);
    if_rem_password = saveuserinfo
      .getBoolean("rem_password", false);
    if_auto_login = saveuserinfo.getBoolean("auto_login", false);
    rem_username_CB.setChecked(if_rem_username);
    rem_password_CB.setChecked(if_rem_password);
    auto_login_CB.setChecked(if_auto_login);
    password_ET.setText(password);
    rem_username_CB.setChecked(if_rem_username);
    rem_password_CB.setChecked(if_rem_password);
    auto_login_CB.setChecked(if_auto_login);

   }

   @Override
   public void beforeTextChanged(CharSequence s, int start, int count,
     int after) {
    // TODO Auto-generated method stub

   }

   @Override
   public void afterTextChanged(Editable s) {
    // TODO Auto-generated method stub

   }
  });

  //添加記住用戶名選項的處理方法
  rem_username_CB
    .setOnCheckedChangeListener(new OnCheckedChangeListener() {

     @Override
     public void onCheckedChanged(CompoundButton buttonView,
       boolean isChecked) {
      // TODO Auto-generated method stub

      if (!isChecked) {
       rem_password_CB.setChecked(false);
       auto_login_CB.setChecked(false);
      }

     }
    });
  //添加記住密碼選項的處理方法
  rem_password_CB
    .setOnCheckedChangeListener(new OnCheckedChangeListener() {

     @Override
     public void onCheckedChanged(CompoundButton buttonView,
       boolean isChecked) {
      // TODO Auto-generated method stub

      if (isChecked) {
       rem_username_CB.setChecked(true);
      }
      if (!isChecked) {
       auto_login_CB.setChecked(false);
      }

     }
    });
        //添加添加記住密碼選項的處理方法
  auto_login_CB.setOnCheckedChangeListener(new OnCheckedChangeListener() {

   @Override
   public void onCheckedChanged(CompoundButton buttonView,
     boolean isChecked) {
    // TODO Auto-generated method stub

    if (isChecked) {
     rem_username_CB.setChecked(true);
     rem_password_CB.setChecked(true);
    }

   }
  });

  loginButton.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    checkandsaveSP();
    
   }
  });

 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.shared_preferences_test, menu);
  return true;
 }
 
 private void init(){
  //初始化數據，讀取sharedpreference裏的數據填充各表現。
  //lastusername是用來保存最近一次輸入的用戶名
  lastusername = getSharedPreferences("lastusername", 0);
  lastusername_input = lastusername.getString("lastusername", "");
  //取出用戶名後，讀取這個用戶名對應的密碼和選項框狀態
  saveuserinfo = getSharedPreferences(lastusername_input, 0);
  username = saveuserinfo.getString("username", "");
  password = saveuserinfo.getString("password", "");
  if_rem_username = saveuserinfo.getBoolean("rem_username", false);
  if_rem_password = saveuserinfo.getBoolean("rem_password", false);
  if_auto_login = saveuserinfo.getBoolean("auto_login", false);
  rem_username_CB.setChecked(if_rem_username);
  rem_password_CB.setChecked(if_rem_password);
  auto_login_CB.setChecked(if_auto_login);
  username_ET.setText(username);
  password_ET.setText(password);
  result += "username:" + username + "\n";
  result += "password:" + password + "\n";
  result += "if_rem_username:" + if_rem_username + "\n";
  result += "if_rem_password:" + if_rem_password + "\n";
  result += "if_auto_login:" + if_auto_login + "\n";
  resultTV.setText(result);
 }
 
 private void check_autolog_selected(){
  //如果選中了自動登錄則開始自動登錄
  if(if_auto_login){
   login(username,password);
  }
  
  
 }
 
 private void login(String username,String password){
  if (username.equals("aaaa")&&password.equals("aaaa")){
   //這裏可以加入代碼進行頁面跳轉。示例只是彈出登錄成功的對話框
   
   AlertDialog.Builder passBuilder =new AlertDialog.Builder(this);
   passBuilder.setTitle("登錄成功");
   passBuilder.setCancelable(false);
   passBuilder.setNegativeButton("確定",new DialogInterface.OnClickListener() {
    
    @Override
    public void onClick(DialogInterface dialog, int which) {
     // TODO Auto-generated method stub
     
     
    }
   });
   passBuilder.create();
   passBuilder.show();
   
  }
  else{
   AlertDialog.Builder passBuilder =new AlertDialog.Builder(this);
   passBuilder.setTitle("用戶名密碼錯誤");
   passBuilder.setCancelable(false);
   passBuilder.setNegativeButton("確定",new DialogInterface.OnClickListener() {
    
    @Override
    public void onClick(DialogInterface dialog, int which) {
     // TODO Auto-generated method stub
     //密碼錯誤不做任何處理
       
     
    }
   });
   passBuilder.create();
   passBuilder.show();
   
  }
  
  
 }
 
 private void checkandsaveSP(){
  //點擊登陸後檢查所有選項，記錄最後登錄的用戶名，按選項將用戶名密碼和三個選項框狀態寫入Sharepreference中

  // TODO Auto-generated method stub
  username = username_ET.getText().toString().trim();
  password = password_ET.getText().toString().trim();
  if_rem_username = rem_username_CB.isChecked();
  if_rem_password = rem_password_CB.isChecked();

  if_auto_login = auto_login_CB.isChecked();
  lastusername.edit().putString("lastusername", username)
    .commit();
  lastusername.edit().commit();
  saveuserinfo = getSharedPreferences(username, 0);
  if (if_rem_username) {
   saveuserinfo.edit().putString("username", username)
     .commit();
  }
        if(!if_rem_username){
   saveuserinfo.edit().putString("username", "").commit();
  }
  if (if_rem_password) {
   saveuserinfo.edit().putString("password", password)
     .commit();
  }
        if(!if_rem_password){
   saveuserinfo.edit().putString("password", "").commit();
  }
  saveuserinfo.edit().putBoolean("rem_username", if_rem_username)
    .commit();
  saveuserinfo.edit().putBoolean("rem_password", if_rem_password)
    .commit();
  saveuserinfo.edit().putBoolean("auto_login", if_auto_login)
    .commit();
  result = "";
  result += "lastusername is: " + username + "\n";
  result += "username:" + username + "\n";
  result += "password:" + password + "\n";
  result += "if_rem_username:" + if_rem_username + "\n";
  result += "if_rem_password:" + if_rem_password + "\n";
  result += "if_auto_login:" + if_auto_login + "\n";
  resultTV.setText(result);
  //進行登錄處理
  login(username,password);
 
 }

}

 

 

對應的佈局文件爲：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/welcom_welcome"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#B67044"
        android:singleLine="true"
        android:text="歡迎光臨SharedPreference測試頁面" />

    <TableLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="用戶名"

                android:textSize="20sp" />

            <EditText
                android:id="@+id/username"
                android:layout_width="140sp"
                android:layout_height="wrap_content"
                android:inputType="text"
                android:maxLength="16"
                android:singleLine="true" />
        </TableRow>

        <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="密碼"
                android:textSize="20sp" />

            <EditText
                android:id="@+id/password"
                android:layout_width="140sp"
                android:layout_height="wrap_content"
                android:maxLength="16"
                android:singleLine="true" />
        </TableRow>
    </TableLayout>
   
     <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
        <CheckBox
            android:id="@+id/rem_user"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="記住用戶"
            android:textSize="12px" >
        </CheckBox>
        <CheckBox
            android:id="@+id/rem_psw"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="記住密碼"
            android:textSize="12px" >
        </CheckBox>

        <CheckBox
            android:id="@+id/auto_login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="自動登錄"
            android:textSize="12px" >
        </CheckBox>
       
    </LinearLayout>

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

        <Button
            android:id="@+id/login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="登錄" />

        <Button
            android:id="@+id/regist"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="註冊" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="忘記密碼" />
    </LinearLayout>

    <TextView
        android:id="@+id/result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
       
        />
</LinearLayout>

 

如下是sharepreference文件的保存結果：

shell@android:/data/data/com.windvally.datasavefile/shared_prefs # pwd
pwd
/data/data/com.windvally.datasavefile/shared_prefs
shell@android:/data/data/com.windvally.datasavefile/shared_prefs # ls
ls
UserInfo.xml
aaa.xml
aaaa.xml
bbbb.xml
cccc.xml
dddd.xml
lastusername.xml
qqqq.xml
shell@android:/data/data/com.windvally.datasavefile/shared_prefs #