Android怎么实现简易登陆注册

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activity_login

LoginActivity

package com.jld.exam;import android.content.Intent;import android.os.Bundle;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import androidx.appcompat.app.AppCompatActivity;public class LoginActivity extends AppCompatActivity {EditText ed_username;EditText ed_password;Button bu_login;Button bu_register;String username;String password;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_login);ed_username = findViewById(R.id.ed_username);ed_password = findViewById(R.id.ed_password);bu_login = findViewById(R.id.bu_login);bu_register = findViewById(R.id.bu_register);//登录按钮监听bu_login.setOnClickListener(v -> {username = ed_username.getText().toString();password = ed_password.getText().toString();//登陆的简单逻辑if (username.equals("")) {Toast.makeText(LoginActivity.this, "请输入用户名", Toast.LENGTH_SHORT).show();} else if (password.equals("")) {Toast.makeText(LoginActivity.this, "请输入密码", Toast.LENGTH_SHORT).show();} else if (!username.equals("root") || !password.equals("123456")) {Toast.makeText(LoginActivity.this, "用户名或密码错误", Toast.LENGTH_SHORT).show();} else {Intent intent = new Intent(LoginActivity.this, MainActivity.class);startActivity(intent);}});//注册按钮监听bu_register.setOnClickListener(v -> {Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);startActivity(intent);});}}

activity_main

MainActivity

package com.jld.exam;import android.graphics.Color;import android.os.Bundle;import android.widget.LinearLayout;import androidx.appcompat.app.AppCompatActivity;import androidx.recyclerview.widget.GridLayoutManager;import androidx.recyclerview.widget.RecyclerView;public class MainActivity extends AppCompatActivity {RecyclerViewAdapter recyclerViewAdapter;private final int[] icno = {R.drawable.clock, R.drawable.signal, R.drawable.box,R.drawable.second, R.drawable.elephone, R.drawable.ff, R.drawable.notebook, R.drawable.mark, R.drawable.yx,R.drawable.shop, R.drawable.theme, R.drawable.xl,};private final String[] name = {"时钟", "信号", "宝箱", "秒钟", "大象", "FF", "记事本", "书签", "印象", "商店", "主题", "迅雷"};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//GridLayoutManagerGridLayoutManager gridLayoutManager = new GridLayoutManager(MainActivity.this, 3);//创建recyclerviewRecyclerView recyclerView = findViewById(R.id.recycler);//设定布局管理器recyclerView.setLayoutManager(gridLayoutManager);//创建适配器recyclerViewAdapter = new RecyclerViewAdapter(icno, name);recyclerView.setAdapter(recyclerViewAdapter);//设定适配器}}

activity_register

RegisterActivity

package com.jld.exam;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;public class RegisterActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_register);}}

recyc_item

RecyclerViewAdapter

package com.jld.exam;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import androidx.annotation.NonNull;import androidx.recyclerview.widget.RecyclerView;public class RecyclerViewAdapter extends RecyclerView.Adapter {private final int[] icno;private final String[] desc;public RecyclerViewAdapter(int[] icno, String[] desc) {this.icno = icno;this.desc = desc;}@NonNull@Overridepublic ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyc_item, parent, false);return new ViewHolder(view);}@Overridepublic void onBindViewHolder(@NonNull ViewHolder holder, int position) {holder.imageView.setImageResource(icno[position]);holder.textView.setText(desc[position]);}@Overridepublic int getItemCount() {return icno.length;}//ViewHolderpublic static class ViewHolder extends RecyclerView.ViewHolder {View item;ImageView imageView;TextView textView;public ViewHolder(@NonNull View itemView) {super(itemView);item = itemView;imageView = itemView.findViewById(R.id.iv_image);textView = itemView.findViewById(R.id.tv_desc);}}}

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