Android LinearLayout布局 实现十二生肖的跳转

1，编写activity_main.xml 代码

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

    android:orientation="vertical"

    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="选择您的生肖："
        android:layout_marginTop="15dp"
        android:textSize="50sp"

        />
    <Spinner
        android:id="@+id/sp"
        android:layout_width="350dp"
        android:layout_height="50dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="30dp"
        />
    <Button
        android:id="@+id/enter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="50dp"
        android:text="确定"

        />


</LinearLayout>

2,编写 activity_second.xml 代码

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

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="40dp"
        />
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:textSize="30sp"
        android:layout_marginTop="20dp"
        />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="300dp"
        android:layout_marginLeft="100dp"
        android:text="返回"/>

</LinearLayout>

3,导入图片

4,编写 MainActivity 类

package com.example.chinesezodiac;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {
    private Spinner sp;

    private String[] data ={"鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"};

    private ArrayAdapter<String> adapter;

    private Button enterBth;

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

        sp = (Spinner)findViewById(R.id.sp);

        enterBth  = (Button)findViewById(R.id.enter) ;

        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,data);

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        sp.setAdapter(adapter);

        enterBth.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int index = sp.getSelectedItemPosition();
                Log.d("Chinesezodiac","选中的生肖是"+index+data[index]);

//                跳转
                Intent intent = new Intent(MainActivity.this,SecondActivity.class);

//                 int
                intent.putExtra("Chines",index);

//                完成数据 传递
                startActivity(intent);

//                结束
//                MainActivity.this.finish();

            }
        });

    }
}

5，编写 SecondActivity 类

package com.example.chinesezodiac;

import androidx.appcompat.app.AppCompatActivity;

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

public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
    private int index;

    private ImageView imageView;
    private TextView textView;
    private String[] data = {"鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪"};
    private int[] imgData = {R.drawable.shu, R.drawable.niu, R.drawable.hu, R.drawable.tu, R.drawable.long1, R.drawable.she, R.drawable.ma, R.drawable.yang, R.drawable.hou, R.drawable.ji, R.drawable.gou, R.drawable.hjz,};

    private Button button;

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

//        实例化
        imageView = (ImageView) findViewById(R.id.img);
        textView = (TextView) findViewById(R.id.text);
        button = (Button) findViewById(R.id.btn);

//        得到 intent
        Intent intent = getIntent();

//        传值；默认为0
        index = intent.getIntExtra("Chines", 0);

//        获取 文本
        textView.setText(data[index]);

//        获取 图片
        imageView.setImageResource(imgData[index]);

//        点击返回事件
        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        //        根据id 判断 用户当前点的是那个按钮；
        switch (v.getId()) {

            case R.id.btn:
//                跳转
                Intent intent = new Intent(SecondActivity.this, MainActivity.class);
//                intent.putExtra()
                startActivity(intent);
                break;
        }
    }
}

6,项目路径

7，运行结果截图