南昌做网站建设哪家好,免费做试用的网站,做网站公司长沙哪家好,网站怎么添加二级域名本文主要讲述了利用sharedpreference实现记住密码与自动登陆功能
根据checkbox的状态存储用户名与密码将结果保存在自定义的application中#xff0c;成为全局变量
布局文件
?xml version1.0 encodingutf-8?
ScrollView xmlns:andro…本文主要讲述了利用sharedpreference实现记住密码与自动登陆功能
根据checkbox的状态存储用户名与密码将结果保存在自定义的application中成为全局变量
布局文件
?xml version1.0 encodingutf-8?
ScrollView xmlns:androidhttp://schemas.android.com/apk/res/androidandroid:layout_widthfill_parentandroid:layout_heightfill_parentandroid:fitsSystemWindowstrueLinearLayoutandroid:orientationverticalandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:paddingTop56dpandroid:paddingLeft24dpandroid:paddingRight24dpImageView android:srcdrawable/logoandroid:layout_widthwrap_contentandroid:layout_height72dpandroid:layout_marginBottom24dpandroid:layout_gravitycenter_horizontal /!-- Email Label --android.support.design.widget.TextInputLayoutandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:layout_marginTop8dpandroid:layout_marginBottom8dpEditText android:idid/input_emailandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:inputTypetextEmailAddressandroid:hintPhone //android.support.design.widget.TextInputLayout!-- Password Label --android.support.design.widget.TextInputLayoutandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:layout_marginTop8dpandroid:layout_marginBottom8dpEditText android:idid/input_passwordandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:inputTypetextPasswordandroid:hintPassword//android.support.design.widget.TextInputLayoutLinearLayoutandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:orientationhorizontalandroid:gravitycenter_horizontalCheckBoxandroid:idid/rm_passandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:text记住密码android:layout_marginRight30dpandroid:checkedtrue/CheckBoxandroid:idid/au_loginandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:text自动登陆android:layout_marginLeft30dp//LinearLayoutandroid.support.v7.widget.AppCompatButtonandroid:idid/btn_loginandroid:layout_widthfill_parentandroid:layout_heightwrap_contentandroid:layout_marginTop24dpandroid:layout_marginBottom24dpandroid:padding12dpandroid:textLogin/TextView android:idid/link_signupandroid:layout_widthfill_parentandroid:layout_heightwrap_contentandroid:layout_marginBottom24dpandroid:textNo account yet? Create oneandroid:gravitycenterandroid:textSize16dip//LinearLayout
/ScrollView
登陆界面
package com.zj.login;import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;import com.zj.cafetriafood.R;import butterknife.Bind;
import butterknife.ButterKnife;/*** A login screen that offers login via email/password.*/
public class LoginActivity extends AppCompatActivity {private static final String TAG LoginActivity;private static final int REQUEST_SIGNUP 0;private SharedPreferences sp;Bind(R.id.input_email) EditText _emailText;Bind(R.id.input_password) EditText _passwordText;Bind(R.id.btn_login) Button _loginButton;Bind(R.id.link_signup) TextView _signupLink;Bind(R.id.rm_pass) CheckBox _rmpass;Bind(R.id.au_login) CheckBox _aulogin;Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_login);ButterKnife.bind(this);sp this.getSharedPreferences(userInfo, Activity.MODE_PRIVATE);_loginButton.setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View v) {login();}});_signupLink.setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View v) {// Start the Signup activityIntent intent new Intent(getApplicationContext(), SignupActivity.class);startActivityForResult(intent, REQUEST_SIGNUP);}});if(sp.getBoolean(ISCHECK, false)){_rmpass.setChecked(true);_emailText.setText(sp.getString(USER_NAME, ));_passwordText.setText(sp.getString(PASSWORD, ));if(sp.getBoolean(AUTO_ISCHECK, false)){//设置默认是自动登录状态_aulogin.setChecked(true);//跳转界面//Intent intent new Intent(LoginActivity.this,MainActivity.class);//startActivity(intent);this.finish();}}}public void login() {Log.d(TAG, Login);if (!validate()) {onLoginFailed();return;}_loginButton.setEnabled(false);final ProgressDialog progressDialog new ProgressDialog(LoginActivity.this,R.style.AppTheme_Dark_Dialog);progressDialog.setIndeterminate(true);progressDialog.setMessage(Authenticating...);progressDialog.show();String email _emailText.getText().toString();String password _passwordText.getText().toString();// TODO: Implement your own authentication logic here.Log.i(test,emailpasswordemail,password);if(!email.equals(123)||!password.equals(123456)){progressDialog.dismiss();_loginButton.setEnabled(true);_emailText.setText();_passwordText.setText();Toast.makeText(getApplication(), 用户名或密码错误, Toast.LENGTH_SHORT).show();return;}if(_rmpass.isChecked()){//记住用户名、密码、SharedPreferences.Editor editor sp.edit();editor.putString(USER_NAME, email);editor.putString(PASSWORD, password);editor.commit();sp.edit().putBoolean(ISCHECK, true).commit();}else{sp.edit().putBoolean(ISCHECK, true).commit();}if (_aulogin.isChecked()){sp.edit().putBoolean(AUTO_ISCHECK, true).commit();}else{sp.edit().putBoolean(AUTO_ISCHECK, false).commit();}new android.os.Handler().postDelayed(new Runnable() {public void run() {// On complete call either onLoginSuccess or onLoginFailedonLoginSuccess();// onLoginFailed();progressDialog.dismiss();}}, 3000);}Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode REQUEST_SIGNUP) {if (resultCode RESULT_OK) {// TODO: Implement successful signup logic here// By default we just finish the Activity and log them in automaticallythis.finish();}}}Overridepublic void onBackPressed() {// Disable going back to the MainActivitymoveTaskToBack(true);}public void onLoginSuccess() {_loginButton.setEnabled(true);finish();}public void onLoginFailed() {Toast.makeText(getBaseContext(), Login failed, Toast.LENGTH_LONG).show();_loginButton.setEnabled(true);}public boolean validate() {boolean valid true;String email _emailText.getText().toString();String password _passwordText.getText().toString();if (email.isEmpty() || !Patterns.PHONE.matcher(email).matches()) {_emailText.setError(enter a valid phone number);valid false;} else {_emailText.setError(null);}if (password.isEmpty() || password.length() 4 || password.length() 10) {_passwordText.setError(between 4 and 10 alphanumeric characters);valid false;} else {_passwordText.setError(null);}return valid;}
}MainActivity
package com.zj.cafetriafood;import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;import com.zj.application.MyApplication;
import com.zj.login.LoginActivity;import butterknife.Bind;
import butterknife.ButterKnife;public class MainActivity extends AppCompatActivity {private SharedPreferences sp;private MyApplication myApplication;Bind(R.id.text_user) TextView text_user;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ButterKnife.bind(this);sp this.getSharedPreferences(userInfo, Activity.MODE_PRIVATE);if(sp.getBoolean(AUTO_ISCHECK, false)){myApplication (MyApplication) getApplication();myApplication.setUsername(sp.getString(USER_NAME,));}else{Intent intent new Intent(this, LoginActivity.class);startActivity(intent);}text_user.setText(myApplication.getUsername());}}
MyApplication
package com.zj.application;import android.app.Application;/*** Created by jjx on 2016/5/22.*/
public class MyApplication extends Application{public String getUsername() {return username;}public void setUsername(String username) {this.username username;}String username;Overridepublic void onCreate() {super.onCreate();setUsername(用户名);}
}
参考链接
Android 记住密码和自动登录界面的实现SharedPreferences 的用法 - liuyiming_的专栏 - 博客频道 - CSDN.NET
Android中Application类用法 - Harvey Ren - 博客园
Application对象的生命周期是整个程序中最长的它的生命周期就等于这个程序的生命周期。因为它是全局的单例的所以在不同的Activity,Service中获得的对象都是同一个对象。所以可以通过Application来进行一些如数据传递、数据共享和数据缓存等操作。
在Android中可以通过继承Application类来实现应用程序级的全局变量这种全局变量方法相对静态类更有保障直到应用的所有Activity全部被destory掉之后才会被释放掉。
效果如下
