3.13

所花时间：1.5小时

代码量：51

博客篇：1

了解到的知识点

页面的跳转和返回

跳转使用startActivity(Intent)

返回使用finish

跳转：

package com.example.test1;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.bt1).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        startActivity(new Intent(this, MainActivity2.class));
    }
}

　　返回：

package com.example.test1;

import android.os.Bundle;
import android.view.View;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity2 extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        findViewById(R.id.bt_back).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        finish();
    }
}