[移动开发]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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:translationX="100dp"
        android:translationY="150dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="账号："
            android:textSize="25dp"></TextView>

        <EditText
            android:id="@+id/username"
            android:layout_width="150dp"
            android:layout_height="wrap_content"
            android:hint="请输入用户名"></EditText>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:translationX="100dp"
        android:translationY="180dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码："
            android:textSize="25dp"></TextView>

        <EditText
            android:inputType="numberPassword"
            android:id="@+id/password"
            android:layout_width="150dp"
            android:layout_height="wrap_content"
            android:hint="请输入密码">

        </EditText>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:translationX="0dp"
        android:translationY="230dp">

        <Button
            android:id="@+id/button1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="登录"
            android:textSize="25dp"></Button>
    </LinearLayout>
</LinearLayout>

xml2

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:translationX="80dp"
        android:translationY="100dp">

        <TextView
            android:id="@+id/welcome"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#00ff00"
            android:textSize="28dp"></TextView>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:translationX="100dp"
        android:translationY="150dp">

        <TextView
            android:id="@+id/username"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25dp"></TextView>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:translationX="100dp"
        android:translationY="180dp">

        <TextView
            android:id="@+id/password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25dp"></TextView>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:translationY="250dp">

        <Button
            android:id="@+id/button2"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:background="@drawable/back"
            android:translationX="380dp"></Button>

    </LinearLayout>

</LinearLayout>