Android开发学习——记单词APP登录注册页面完善和跳转

package com.example.myapplication15;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button1 = findViewById(R.id.button7);
        Button button2 = findViewById(R.id.button8);
        Button button3 = findViewById(R.id.button9);
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
    }
    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.button7:
                Toast.makeText(com.example.myapplication15.MainActivity.this, "登录成功", Toast.LENGTH_SHORT).show();
                break;
            case R.id.button8:
                Intent intent=new Intent(com.example.myapplication15.MainActivity.this, Main2Activity.class);
                startActivity(intent);
                break;
            case R.id.button9:
                Toast.makeText(com.example.myapplication15.MainActivity.this, "查询成功", Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

package com.example.myapplication15;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class Main2Activity extends AppCompatActivity implements View.OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Button button1 = findViewById(R.id.button6);
        Button button2 = findViewById(R.id.button7);
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
    }
    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.button6:
                Intent intent=new Intent(Main2Activity.this,MainActivity.class);
                startActivity(intent);
            case R.id.button7:
               
        }
    }
}

    
        学生
        老师
        军人