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 Android教程網 >> Android技術 >> 關於Android編程 >> Android實現記住用戶名和密碼功能

Android實現記住用戶名和密碼功能

編輯:關於Android編程

Android 實現記住用戶名和密碼的功能是通過SharedPreference 存儲來實現的。創建一個復選按鈕,通過按鈕的否選取來進行事件處理。若按鈕選中存儲賬號和密碼的信息。若按鈕沒有選中,則清空賬號和密碼的信息。

結果演示:

源代碼下載地址:

https://github.com/GXS1225/Android————-.git

分析

(1)判斷是否輸入了賬號和密碼

  if(name.trim().equals("")){
        Toast.makeText(this, "請您輸入用戶名!", Toast.LENGTH_SHORT).show();
        return;
      }
      if(pswd.trim().equals("")){
        Toast.makeText(this, "請您輸入密碼!", Toast.LENGTH_SHORT).show();
        return;
      }

(2)在layout_main.xml定義一個 CheckBox,進行事件處理

//通過
boolean CheckBoxLogin = checkbox.isChecked();
      //按鈕被選中,下次進入時會顯示賬號和密碼             
      if (CheckBoxLogin)
      {
          Editor editor = sp.edit();
          editor.putString("uname", name);
          editor.putString("upswd", pswd);
          editor.putBoolean("auto", true);
          editor.commit();
      }
      //按鈕被選中,清空賬號和密碼,下次進入時會顯示賬號和密碼       
      else      
      { 
        Editor editor = sp.edit();
        editor.putString("uname", null);
        editor.putString("upswd", null);
        editor.putBoolean("auto", false);
        editor.commit();
        }

(3) SharedPreference 的存儲實現

//先定義
SharedPreferences sp = null; 

sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE);
//對uname 和 upswd 的操作
 if (sp.getBoolean("checkboxBoolean", false))
      {
        uname.setText(sp.getString("uname", null));
        upswd.setText(sp.getString("upswd", null)); 
        checkboxButton.setChecked(true);

      }

(4)跳轉到Content.java界面

//Intent跳轉
Intent intent = new Intent(Welcome.this,Content.class);
startActivity(intent);
finish();

步驟:

先寫一個登陸的界面: layout_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" 
  android:background="#ADD8E6">

  <RelativeLayout
    android:id="@+id/login_div"
    android:layout_width="fill_parent"
    android:layout_height="221dp"
    android:layout_margin="15dip"
    android:background="@drawable/btn_bg"
    android:padding="15dip" >

    <TextView
      android:id="@+id/login_user_input"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentTop="true"
      android:layout_margin="5dp"
      android:text="@string/user"
      android:textSize="16dp"
      android:typeface="sans" />

    <EditText
      android:id="@+id/user_input"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_below="@id/login_user_input"
      android:background="@android:drawable/editbox_background"
      android:inputType="text"
      android:singleLine="true" />

    <TextView
      android:id="@+id/login_pass_input"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@id/user_input"
      android:layout_margin="5dp"
      android:text="@string/pass"
      android:textSize="16dp"
      android:typeface="sans" />

    <EditText
      android:id="@+id/pass_input"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_below="@id/login_pass_input"
      android:background="@android:drawable/editbox_background"
      android:inputType="textPassword"
      android:singleLine="true" />

    <CheckBox
      android:id="@+id/checkBoxLogin"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignLeft="@+id/pass_input"
      android:layout_alignParentBottom="true"
      android:text="@string/no_user" />

    <Button
      android:id="@+id/new_user"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_alignRight="@+id/pass_input"
      android:layout_marginRight="28dp"
      android:onClick="To_Title"
      android:text="@string/new_user" />

  </RelativeLayout>

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

     <TextView
       android:layout_width="402dp"
       android:layout_height="51dp"
       android:layout_marginLeft="50dp"
       android:background="@drawable/gxs_ziti" />

     <Button
       android:layout_width="120dp"
       android:layout_height="120dp"
       android:onClick="To_fruist"
       android:background="@drawable/gxs2" 
       android:layout_marginLeft="80dp"
       />



   </LinearLayout>

</LinearLayout>

Welcome.java

package com.gxs.login;
import com.example.login.R;
import com.gxs.listview.*;
import android.os.Bundle;
import android.preference.Preference;
import android.app.Activity;
import android.app.SearchManager.OnCancelListener;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
public class Welcome extends Activity implements OnClickListener{
  private EditText uname = null;
  private EditText upswd = null;
  private CheckBox checkboxButton = null;
  private Button login = null;
  SharedPreferences sp = null; 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout_main);
    sp = this.getSharedPreferences("userinfo", Context.MODE_PRIVATE);
    init();

  }

  public void init()
  {
    uname = (EditText) findViewById(R.id.user_input);
    upswd = (EditText) findViewById(R.id.pass_input);
    checkboxButton = (CheckBox) findViewById(R.id.checkBoxLogin);
    login = (Button) findViewById(R.id.new_user);
    if (sp.getBoolean("checkboxBoolean", false))
      {
        uname.setText(sp.getString("uname", null));
        upswd.setText(sp.getString("upswd", null)); 
        checkboxButton.setChecked(true);

      }
    login.setOnClickListener(this);
  }

  @Override
  public void onClick(View v) {
    if (v == login){
      String name = uname.getText().toString();
      String pswd = upswd.getText().toString();
      if(name.trim().equals("")){
        Toast.makeText(this, 
        "請您輸入用戶名!", Toast.LENGTH_SHORT).show();
        return;
      }
      if(pswd.trim().equals("")){
        Toast.makeText(this, 
        "請您輸入密碼!", Toast.LENGTH_SHORT).show();
        return;
      }
      boolean CheckBoxLogin = checkboxButton.isChecked();
      if (CheckBoxLogin)
      {
          Editor editor = sp.edit();
          editor.putString("uname", name);
          editor.putString("upswd", pswd);
          editor.putBoolean("checkboxBoolean", true);
          editor.commit();
      }
      else
      { 
        Editor editor = sp.edit();
        editor.putString("uname", null);
        editor.putString("upswd", null);
        editor.putBoolean("checkboxBoolean", false);
        editor.commit();
        }
      //Intent跳轉
      Intent intent=new Intent(Welcome.this,Content.class);
      startActivity(intent);
      finish();
    }
  }

}

Content.java

package com.gxs.listview;
import java.util.List;
import com.example.login.R;
import com.gxs.*;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Content extends Activity{
  private ListView listview_fruits;  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.content);

  }
}

content.xml

<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: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=".Welcome" 
  >

  <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="內容"
    android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持本站。

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