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2021
12-13

Android Studio实现登录功能案例讲解

LoginActivity.java
 
包 com.hyx.example.mymap;
 
 
import java.text.SimpleDateFormat;
import java.util.Date;
 
 
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
 
 
公共类 LoginActivity扩展 Activity {
     private EditText username = null ;
    private EditText password = null ;
    private Button login = null ;
    private SharedPreferences sharedPreferences ;
 
    //初始化控件
 公共无效的init(){
        用户名 =(的EditText)findViewById(R.id。 username_edit);
        密码 =(的EditText)findViewById(R.id。 userpassword_edit);
        login =(Button)findViewById( R.id.login_button);    
 
 
    }
 
    @Override
 protected void onCreate(Bundle savedInstanceState){
         super .onCreate(savedInstanceState);    
        的setContentView(R.layout 登录); //显示自己的UI视图
 //        初始化控件
 init();
//调用验证是否第一次登录方法
         userUpdate();
//调用登录验证方法
         loginVerify();
 
 
    }
 
    //判断是否第一次登录初始化用户名密码
 public void userUpdate(){
 //读取文件内容
 sharedPreferences = getSharedPreferences( “myfile”, MODE_PRIVATE);
//读取数据
 String susername = sharedPreferences .getString( “username”, “”);                    
        String spwd = sharedPreferences .getString(“pwd”,“”);
//第一次进入程序读取用户名密码为空,则写入初始化数据并提示用户
 if(susername.equals(“”)&& spwd.equals(“”)){        
 
//写入数据
             SharedPreferences.Editor editor = sharedPreferences .edit();
            editor.putString(“username”,“admin”);
            editor.putString(“pwd”,“123456”);
//提交数据
             editor.commit();
            吐司。makeText(LoginActivity。这个,“初始化用户名管理员密码123456” ,
                    吐司。LENGTH_LONG)。show();
        }
    }
 
 
    //登录验证
 public void loginVerify(){    
 
 
//点击登录按钮所发生的事件。(1,验证合法2,验证不合法)
 login .setOnClickListener( new OnClickListener(){        
 
 
            @Override
 public void onClick(查看arg0){
 //定义变量
 String strUsername,strPassword;
//得到输入框内容
 strUsername = username .getText()。toString();                                            
                strPassword = password .getText()。toString();
 
//读取文件内容得到用户名密码
 sharedPreferences = getSharedPreferences( “myfile”, MODE_PRIVATE);
//读取数据
 String susername = sharedPreferences .getString( “username”, “”);                                
                String spwd = sharedPreferences .getString(“pwd”,“”);
 
 
 
//登录校验
 if(strUsername.equals(susername)&& strPassword.equals(spwd)){
 //登录成功后提示
 Toast。makeText(LoginActivity。这个, “登陆成功!” ,                                    
                            吐司。LENGTH_SHORT).show();
//登陆成功后切换到MainActivity.class
                    意图意图= 新意图(LoginActivity。此,
                            主要活动。课程);
//启动
                     startActivity(intent);
 
//登录成功后销毁登录界面
                     finish();
                } else {
                    吐司。makeText(LoginActivity。这个,“登陆失败!” ,
                            吐司。LENGTH_SHORT).show();
                }
 
            }
        });
    }
 
 
// @Override
 // public boolean onCreateOptionsMenu(菜单菜单){
 // getMenuInflater()。inflate(R.menu.main,menu);
//返回true;
//}
 
 }
 
login.xml
< RelativeLayout xmlns:android = “http://schemas.android.com/apk/res/android”
 xmlns:custom = “http://schemas.android.com/apk/res-auto”
 android :layout_width = “match_parent “
 android :layout_height = ”match_parent“
 android :fitsSystemWindows = ”true“ >                
 
    < RelativeLayout
 android :id = “@ + id / login_layout”
 android :layout_width = “match_parent”
 android :layout_height = “wrap_content”
 android :layout_marginLeft = “20dp”
 android :layout_marginRight = “20dp”
 android :gravity = “center” >                                                
        < FrameLayout
 android :id = “@ + id / username_layout”
 android :layout_width = “fill_parent”
 android :layout_height = “wrap_content”
 android :layout_marginTop = “55dp”
 android :gravity = “center” >                                                            
            < EditText
 android :id = “@ + id / username_edit”
 android :layout_width = “match_parent”
 android :layout_height = “55dp”
 android :layout_marginTop = “5dp”
 android :hint = “账号/手机号/邮箱”
 android :paddingRight = “60dp”
 android :maxLength = “20”
 android :paddingLeft = “55dp” >                                                                                                                                
            </ EditText >
            < ImageView
 android :layout_width = “22dp”
 android :layout_height = “21dp”
 android :layout_marginStart = “8dp”
 android :layout_gravity = “left | center_vertical”
 android :background = “@ drawable / zhanghao”
 android :visibility = “visible” / >                                                                                                
            < TextView
 android :id = “@ + id / contry_sn”
 android :layout_width = “40dp”
 android :layout_height = “50dp”
 android :layout_gravity = “left | center_vertical”
 android :layout_marginTop = “4dp”
 android :gravity = “center”
 android :text = “+ 62” android :textColor = “@
 android :color / black”
 android :textSize = “18sp”
 android :visibility = “invisible” />                                                                                                                                                                
        </ FrameLayout >
        < FrameLayout
 android :id = “@ + id / usercode_layout”
 android :layout_width = “fill_parent”
 android :layout_height = “wrap_content”
 android :layout_below = “@ id / username_layout”
 android :layout_marginTop = “6dp”
 android :gravity = “center “ >                                                                        
            < EditText
 android :id = “@ + id / userpassword_edit”
 android :layout_width = “match_parent”
 android :layout_height = “55dp”
 android :hint = “密码”
 android :inputType = “textPassword”
 android :paddingRight = “60dp”
 android : maxLength = “20”
 android :paddingLeft = “55dp” >                                                                                                                                
            </ EditText >
 
            < ImageView
 android :layout_width = “24dp”
 android :layout_height = “22dp”
 android :layout_marginStart = “7dp”
 android :layout_gravity = “left | center_vertical”
 android :background = “@ drawable / mima” />                                                                                
            < 按钮
 android :id = “@ + id / passwordeye”
 android :layout_width = “23dp”
 android :layout_height = “23dp”
 android :background = “@ drawable / kejian”
 android :layout_gravity = “right | center_vertical”
 android :layout_marginRight = “10dp”
 />                                                                                                                
 
 
        </ FrameLayout >
 
        < Button
 android :id = “@ + id / login_button”
 android :layout_width = “wrap_content”
 android :layout_height = “45dp”
 android :layout_below = “@ + id / usercode_layout”
 android :layout_centerHorizo​​ntal = “true”
 android :layout_marginTop = “ 34dp“
 android :background = ”@ drawable / bluebutton“
 android :textSize = ”18sp“ android :text = ” 登录
 “
 android :textColor = ”#fffffff“ />                                                                                                                        
        < Button
 android :id = “@ + id / login_error”
 android :layout_width = “wrap_content”
 android :layout_height = “wrap_content”
 android :layout_alignRight = “@ id / login_button”
 android :layout_below = “@ id / login_button”
 android :text = “忘记密码”
 android :background = “#00000000”
 android :textSize = “16sp” />                                                                                                
        < Button
 android :id = “@ + id / register”
 android :layout_width = “wrap_content”
 android :layout_height = “wrap_content”
 android :layout_alignLeft = “@ id / login_button”
 android :layout_below = “@ id / login_button”
 android :background = “#00000000”
 android :gravity = “left | center_vertical”
 android :text = “注册”
 android :textSize = “16sp”
 android :visibility = “visible” />                                                                                                                        
    </ RelativeLayout >
    < RelativeLayout
 android :id = “@ + id / remember_layout000”
 android :layout_width = “wrap_content”
 android :layout_height = “wrap_content”
 android :layout_alignParentBottom = “true”
 android :layout_marginBottom = “1dp”
 android :layout_marginLeft = “20dp”
 android : layout_marginRight = “20dp” >                                                        
 
    </ RelativeLayout >
</ RelativeLayout >

注意:一定要在AndroidManifest.xml里加activity啊!!!

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