记账本开发3

今天实现了点击按钮跳转页面。

package com.example.myapp0;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity
{
    Button Btn1,Btn2,Btn3;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Btn1=findViewById(R.id.A);
        Btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,PageA.class);
                startActivity(intent);
            }
        });
        Btn2=findViewById(R.id.B);
        Btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,PageB.class);
                startActivity(intent);
            }
        });
        Btn3=findViewById(R.id.C);
        Btn3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,PageC.class);
                startActivity(intent);
            }
        });
    }
}

package com.example.myapp0;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity2 extends AppCompatActivity
{
    Button Btn1,Btn2;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Btn1=findViewById(R.id.A);
        Btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity2.this,PageA.class);
                startActivity(intent);
            }
        });
        Btn2=findViewById(R.id.B);
        Btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity2.this,PageB.class);
                startActivity(intent);
            }
        });
    }
}