Android简单登录（两个页面跳转传值）

mainactivity1

package com.example.android_test05;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {
private EditText username;
private EditText password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button1 = (Button) this.findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                username = (EditText) findViewById(R.id.username);
                password = (EditText) findViewById(R.id.password);
                String name = username.getText().toString().trim();
                String id = password.getText().toString().trim();
                Bundle bundle = new Bundle();
                bundle.putString("username",name);
                bundle.putString("password",id);
                Intent intent1 = new Intent();
                intent1.setClass(MainActivity.this,MainActivity2.class);
                intent1.putExtras(bundle);
                startActivity(intent1);
            }
        });
    }
}

mainactivity2

package com.example.android_test05;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity2 extends AppCompatActivity {
    private TextView Show1;
    private TextView Show2;
    private TextView Show3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Show1 = (TextView) findViewById(R.id.username);
        Show2 = (TextView) findViewById(R.id.password);
        Show3 = (TextView) findViewById(R.id.welcome);
        //通过获取internet。得到附带的数据，赋值给number
        Bundle bundle = this.getIntent().getExtras();
        //通过bundle获取传递过来的字段
        String name = bundle.getString("username");
        String id = bundle.getString("password");
        Show1.setText("账号：" + name);
        Show2.setText("密码：" + id);
        Show3.setText("欢迎" + name+"登录本系统！");
        Button button2 = (Button) this.findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent1 = new Intent();
                intent1.setClass(MainActivity2.this, MainActivity.class);
                startActivity(intent1);
            }
        });
    }
}

xml1

xml2