Android之记住密码与自动登陆实现

以你之姓@ 2022-07-24 12:01 214阅读 0赞

### 本文主要讲述了利用sharedpreference实现记住密码与自动登陆功能 ###

1.  根据checkbox的状态存储用户名与密码
2.  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" />
    
            
            <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>
    
            
            <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 _SharedPreferences _ - liuyiming_ - _ - CSDN.NET]

[Android中Application类用法 - Harvey Ren - 博客园][Android_Application_ - Harvey Ren -]

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 ###

![这里写图片描述][20160522164451557]

[Android _SharedPreferences _ - liuyiming_ - _ - CSDN.NET]: http://blog.csdn.net/liuyiming_/article/details/7704923
[Android_Application_ - Harvey Ren -]: http://www.cnblogs.com/renqingping/archive/2012/10/24/Application.html
[20160522164451557]: /images/20220722/470a38586ac64431a9b5772671358553.png