学习记录593@andriod入门之Activity创建与页面跳转

MainActivity中有个按钮点击跳转到MainActivity2。

其中MainActivity和MainActivity2是java逻辑，activity_main.xml和activity_main2.xml是页面内容。

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView viewById = findViewById(R.id.activity_main_Id);//获取节点
        viewById.setText("修改的内容");//修改内容
        Log.d("启动", "onCreate: ");
//        跳转逻辑
        Button botton = findViewById(R.id.activity_main_botton);
        botton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(MainActivity.this,MainActivity2.class);
                startActivity(intent);
            }
        });

    }
}

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class MainActivity2 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
    }
}

点击即可跳转