安卓场景开发三（登录与记住密码）

一效果图

二注意点

后端部分我就不细说了，只要是采用单点登录服务器的方式来验证
记住密码，采用了微信开源的MMKV，来存储账号与密码当然你也可以用安卓自带的
MMKV：https://github.com/Tencent/MMKV
安卓UI框架采用QMUI，地址：https://qmuiteam.com/android
安卓请求框架：OKHTTP

三代码实现 2.1 依赖

    implementation 'com.tencent:mmkv-shared:1.2.13'
    implementation("com.squareup.okhttp3:okhttp:4.10.0")
    implementation 'com.qmuiteam:qmui:2.0.0-alpha10'

2.2 主要布局文件

2.3 JAVA代码

package com.shu.Activity;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.JsonToken;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

import com.qmuiteam.qmui.widget.dialog.QMUITipDialog;
import com.shu.Common.SysConfig;
import com.shu.Constant.UrlConstant;
import com.shu.Interceptor.LoggingInterceptor;
import com.shu.R;
import com.shu.Utils.EditTextClearUtils;
import com.tencent.mmkv.MMKV;

import org.jetbrains.annotations.NotNull;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;


public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
    
    private static final String TAG = "LoginActivity";
    private Button login_btn;
    private CheckBox check_btn;
    private EditText user_text, password_text;
    private ImageView user_delete, password_delete;
    private final int SUCCESS_FLAG = 1;
    private final int FAIL_FLAG = 3;
    private final int ERROR_FLAG = 2;
    private static String msg = null;
    private final String USERNAME = "USERNAME";
    private final String PASSWORD = "PASSWORD";
    private final String REMEMBER = "REMEMBER";
    
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MMKV.initialize(this);
        // 设置全局变量
        SysConfig.setMmkv(MMKV.defaultMMKV());
        setContentView(R.layout.activity_login);
        login_btn = findViewById(R.id.btn_login);
        check_btn = findViewById(R.id.cb_checkbox);
        user_text = findViewById(R.id.et_userName);
        password_text = findViewById(R.id.et_password);
        user_delete = findViewById(R.id.iv_unameClear);
        password_delete = findViewById(R.id.iv_pwdClear);
        // 监听是否有删除按钮
        EditTextClearUtils.addClearListener(user_text, user_delete,check_btn);
        EditTextClearUtils.addClearListener(password_text, password_delete,check_btn);
        // 设置监听事件
        login_btn.setOnClickListener(this);
        // 复选框点击事件
        check_btn.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    SysConfig.getMmkv().encode(USERNAME, user_text.getText().toString());
                    SysConfig.getMmkv().encode(PASSWORD, password_text.getText().toString());
                    SysConfig.getMmkv().encode(REMEMBER, true);
                } else {
                    SysConfig.getMmkv().remove(USERNAME);
                    SysConfig.getMmkv().remove(PASSWORD);
                    SysConfig.getMmkv().remove(REMEMBER);
                }
            }
        });
        
        // 是否记住密码
        if (SysConfig.getMmkv().decodeBool(REMEMBER)) {
            user_text.setText(SysConfig.getMmkv().decodeString(USERNAME));
            password_text.setText(SysConfig.getMmkv().decodeString(PASSWORD));
            check_btn.setChecked(true);
        }
    }
    
    
    
    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btn_login) {
            if (user_text.getText().toString().equals("")) {
                final QMUITipDialog tipDialog;
                tipDialog = new QMUITipDialog.Builder(LoginActivity.this)
                    .setIconType(QMUITipDialog.Builder.ICON_TYPE_INFO)
                    .setTipWord("账号不能为空!")
                    .create();
                tipDialog.show();
                user_text.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        tipDialog.dismiss();
                    }
                }, 2000);
                
            } else if (password_text.getText().toString().equals("")) {
                final QMUITipDialog tipDialog;
                tipDialog = new QMUITipDialog.Builder(LoginActivity.this)
                    .setIconType(QMUITipDialog.Builder.ICON_TYPE_INFO)
                    .setTipWord("密码不能为空!")
                    .create();
                tipDialog.show();
                password_text.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        tipDialog.dismiss();
                    }
                }, 2000);
            } else {
                login(user_text.getText().toString(), password_text.getText().toString());
            }
        }
    }
    
    
    
    public void login(String username, String password) {
        try {
            // Okhttp客服端
            OkHttpClient client = new OkHttpClient.Builder()
                .addInterceptor(new LoggingInterceptor())
                .callTimeout(5000, TimeUnit.MILLISECONDS)
                .readTimeout(5000, TimeUnit.MILLISECONDS)
                .writeTimeout(5000, TimeUnit.MILLISECONDS)
                .build();
            
            // post请求体
            RequestBody formBody = new FormBody.Builder()
                .add("username", username)
                .add("password", password)
                .add("grant_type", "password")
                .add("scope", "all")
                .build();
            
            // 构造request请求
            Request request = new Request.Builder()
                .url(UrlConstant.AUTH_URL)
                .post(formBody)
                .addHeader("Content-Type", "application/x-www-form-urlencoded")
                .addHeader("Authorization", "Basic Y2xpZW50OmVhc29u")
                .build();
            
            //响应结果
            client.newCall(request).enqueue(new Callback() {
                @Override
                public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                    try {
                        JSONObject value = (JSONObject) new JSONTokener(response.body().string().trim()).nextValue();
                        if (value.length()<=3) {
                            msg = value.getString("msg");
                            Message message = new Message();
                            //Message对象调用what字段
                            message.what = FAIL_FLAG;
                            //发送消息
                            handler.sendMessage(message);
                        } else if ( value.length()>3) {
                            Message message = new Message();
                            //Message对象调用what字段
                            message.what = SUCCESS_FLAG;
                            //发送消息
                            handler.sendMessage(message);
                        } else {
                            onFailure(call, null);
                        }
                        
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
                
                @Override
                public void onFailure(@NotNull Call call, @NotNull IOException e) {
                    Message message = new Message();
                    //Message对象调用what字段
                    message.what = ERROR_FLAG;
                    //发送消息
                    handler.sendMessage(message);
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    
    
    public void alterSuccess() {
        final QMUITipDialog tipDialog;
        tipDialog = new QMUITipDialog.Builder(LoginActivity.this)
            .setIconType(QMUITipDialog.Builder.ICON_TYPE_SUCCESS)
            .setTipWord("登录成功")
            .create();
        tipDialog.show();
        login_btn.postDelayed(new Runnable() {
            @Override
            public void run() {
                tipDialog.dismiss();
            }
        }, 2000);
    }
    
    
    
    public void alterFail() {
        final QMUITipDialog tipDialog;
        tipDialog = new QMUITipDialog.Builder(LoginActivity.this)
            .setIconType(QMUITipDialog.Builder.ICON_TYPE_FAIL)
            .setTipWord(msg)
            .create();
        tipDialog.show();
        login_btn.postDelayed(new Runnable() {
            @Override
            public void run() {
                tipDialog.dismiss();
            }
        }, 2000);
    }
    
    
    public void alterError() {
        final QMUITipDialog tipDialog;
        tipDialog = new QMUITipDialog.Builder(LoginActivity.this)
            .setIconType(QMUITipDialog.Builder.ICON_TYPE_FAIL)
            .setTipWord("服务器连接失败！请检查网络情况！")
            .create();
        tipDialog.show();
        login_btn.postDelayed(new Runnable() {
            @Override
            public void run() {
                tipDialog.dismiss();
            }
        }, 2000);
    }
    
    
    
    private Handler handler = new Handler() {
        @Override
        //重写handleMessage()方法，接收sendMessage()方法传过来的message
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case SUCCESS_FLAG:
                    alterSuccess();
                    return;
                case ERROR_FLAG:
                    alterError();
                    return;
                case FAIL_FLAG:
                    alterFail();
            }
        }
    };
    
}

2.4 全局变量

package com.shu.Common;

import com.tencent.mmkv.MMKV;


public class SysConfig {
    // 全局MMKV
    private static MMKV mmkv;
    public static MMKV getMmkv() {
        return SysConfig.mmkv;
    }
    public static void setMmkv(MMKV mmkv) {
        SysConfig.mmkv = mmkv;
    }
}

2.5 工具类

package com.shu.Utils;

import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ImageView;

import com.shu.Common.SysConfig;


public class EditTextClearUtils {

    
    public static void addClearListener(EditText et, ImageView iv, CheckBox checkBox) {
        et.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }
            @Override
            public void afterTextChanged(Editable s) {
                //如果有输入内容长度大于0那么显示clear按钮
                String str = s + "";
                if (s.length() > 0) {
                    iv.setVisibility(View.VISIBLE);
                } else {
                    iv.setVisibility(View.INVISIBLE);
                    SysConfig.getMmkv().remove("USERNAME");
                    SysConfig.getMmkv().remove("PASSWORD");
                    SysConfig.getMmkv().remove("REMEMBER");
                }
            }
        });

        iv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                et.setText("");
                checkBox.setChecked(false);
            }
        });
    }
}

到此我们的代码就编写完成了。
源码地址：https://github.com/Eason-shu/Android-Demo
喜欢或对你有用，请帮我点个star,谢谢。。。。。。

安卓场景开发三（登录与记住密码）

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