Android Studio第六课：模仿QQ登录跳转

---

导包，添加依赖

找到build.gradle,后缀是自己建的项目名

    // 基础依赖包，必须要依赖
    implementation 'com.geyifeng.immersionbar:immersionbar:3.2.2'
// kotlin扩展（可选）
    implementation 'com.geyifeng.immersionbar:immersionbar-ktx:3.2.2'
// fragment快速实现（可选）已废弃
    implementation 'com.geyifeng.immersionbar:immersionbar-components:3.2.2'

---

代码如下（示例）：

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
import warnings
warnings.filterwarnings('ignore')
import  ssl
ssl._create_default_https_context = ssl._create_unverified_context

登陆界面

package com.example.hc4;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class LoginActivity2 extends AppCompatActivity {
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login2);
       EditText usernameText= findViewById(R.id.editTextTextPersonName);
        EditText passwordText= findViewById(R.id.editTextTextPersonName2);

        findViewById(R.id.button3).setOnClickListener(new View.OnClickListener() {
    
    
                   @Override
                   public void onClick(View view) {
    
    
                       String username=usernameText.getText().toString();
                       String password=passwordText.getText().toString();
                       if(username.equals("hnucm")&&password.equals("123456")){
    
    

                        SharedPreferences   sharedPreferences = getSharedPreferences("user1",MODE_PRIVATE);
                           SharedPreferences.Editor editor=sharedPreferences.edit();
                           editor.putString("username",username);
                           editor.putBoolean("isLogin",true);
                           editor.commit();


                           Intent intent = new Intent(LoginActivity2.this, MainActivity.class);
                           startActivity(intent);
                       }else {
    
    
                           Toast.makeText(LoginActivity2.this,"用户名或密码错误",Toast.LENGTH_LONG).show();
                       }
                   }
               });
    }
}

---

欢迎界面

package com.example.hc4;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;

public class WelcomeActivity2 extends AppCompatActivity {
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome2);
        //等待几秒钟
        //创建一个线程 ---sleep
        Thread thread=new Thread(){
    
    
            @Override
            public void run() {
    
    
                super.run();
                try {
    
    
                    Thread.sleep(5000);
                    SharedPreferences sharedPreferences = getSharedPreferences("user1",MODE_PRIVATE);
                   boolean isLogin=sharedPreferences.getBoolean("isLogin",false);
                    if(isLogin){
    
    
                        Intent intent=new Intent(WelcomeActivity2.this,MainActivity.class);
                        startActivity(intent);
                    }else {
    
    
                        Intent intent=new Intent(WelcomeActivity2.this,LoginActivity2.class);
                        startActivity(intent);

                    }
                } catch (InterruptedException e) {
    
    
                    e.printStackTrace();
                }
            }
        };
        thread.start();
        SharedPreferences sharedPreferences = getSharedPreferences("user1",MODE_PRIVATE);
      boolean isLogin=sharedPreferences.getBoolean("isLogin",false);
      if(isLogin){
    
    
          Intent intent=new Intent(WelcomeActivity2.this,MainActivity.class);
         startActivity(intent);
      }else {
    
    
          Intent intent=new Intent(WelcomeActivity2.this,LoginActivity2.class);
          startActivity(intent);

      }

    }
}

效果展示

主界面

设立俩个按钮点击事件

package com.example.hc4;

import androidx.appcompat.app.AppCompatActivity;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import com.gyf.immersionbar.ImmersionBar;

public class MainActivity extends AppCompatActivity {
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ImmersionBar.with(this)
               // .statusBarColor(R.color.purple_200)
                .init();


        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
    
    
            @Override
            public void onClick(View view) {
    
    
                SharedPreferences sharedPreferences;
                sharedPreferences = getSharedPreferences("user",MODE_PRIVATE);
                SharedPreferences.Editor editor=sharedPreferences.edit();
                editor.putString("username","湖南中医药大学");
//                editor.remove("username");
                editor.commit();

            }
        });
        findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
    
    
            @Override
            public void onClick(View view) {
    
    
                SharedPreferences sharedPreferences=getSharedPreferences("user",MODE_PRIVATE);
                String username = sharedPreferences.getString("username", "");
                String password = sharedPreferences.getString("password", "test123");
                Log.i("hc4","username="+username+" password="+password);
            }
        });
    }
}

好了，本周的内容就是这么多了，到这里就结束了。