Android之记住密码与自动登陆实现
16lz
2021-01-25
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 version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:fitsSystemWindows="true"> <LinearLayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingTop="56dp" android:paddingLeft="24dp" android:paddingRight="24dp"> <ImageView android:src="@drawable/logo" android:layout_width="wrap_content" android:layout_height="72dp" android:layout_marginBottom="24dp" android:layout_gravity="center_horizontal" /> <!-- Email Label --> <android.support.design.widget.TextInputLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="8dp" android:layout_marginBottom="8dp"> <EditText android:id="@+id/input_email" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="textEmailAddress" android:hint="Phone" /> </android.support.design.widget.TextInputLayout> <!-- Password Label --> <android.support.design.widget.TextInputLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="8dp" android:layout_marginBottom="8dp"> <EditText android:id="@+id/input_password" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="textPassword" android:hint="Password"/> </android.support.design.widget.TextInputLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center_horizontal" > <CheckBox android:id="@+id/rm_pass" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="记住密码" android:layout_marginRight="30dp" android:checked="true" /> <CheckBox android:id="@+id/au_login" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="自动登陆" android:layout_marginLeft="30dp" /> </LinearLayout> <android.support.v7.widget.AppCompatButton android:id="@+id/btn_login" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="24dp" android:layout_marginBottom="24dp" android:padding="12dp" android:text="Login"/> <TextView android:id="@+id/link_signup" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="24dp" android:text="No account yet? Create one" android:gravity="center" android:textSize="16dip"/> </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; @Override public 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() { @Override public void onClick(View v) { login(); } }); _signupLink.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Start the Signup activity Intent 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","email+password="+email+","+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 onLoginFailed onLoginSuccess(); // onLoginFailed(); progressDialog.dismiss(); } }, 3000); } @Override protected 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 automatically this.finish(); } } } @Override public void onBackPressed() { // Disable going back to the MainActivity moveTaskToBack(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; @Override protected 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; @Override public 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
更多相关文章
- startService与bindService
- Android(安卓)Fragment的生命周期详解
- Activity学习（一）：生命周期
- android 理解Fragment生命周期
- Android(安卓)EditText修改显示方式
- android游戏引擎libgdx学习笔记一
- Android中横竖屏切换时Activity的生命周期
- Android横竖屏切换Activity生命周期变化
- 重识Activity——生命周期详解