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_centerHorizontal = “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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