[移动开发]Android studio模拟短信支付功能

需求：

模拟短信支付功能。创建两个Activity，功能分别为支付首页和短信验证Activity。用户在支付首页点击支付按钮，使用startActivityForResult()方法打开一个新的Activity，在短信验证Activity中模拟输入短信验证码，并判断是否正确，使用setResult()方法将判断的结构回传，最后，在支付首页Activity中提示用户。模拟的短信验证码为“9527”。

运行效果图：

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xml代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity12">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="您的消费金额：5000元"
        android:textSize="30sp"
        android:layout_alignParentTop="true"
        android:layout_centerInParent="true"
        android:layout_marginTop="180dp"
        android:id="@+id/money"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="短信支付"
        android:textSize="26sp"
        android:layout_centerVertical="true"
        android:layout_centerInParent="true"
        android:id="@+id/btn_pay"/>

</RelativeLayout>

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity13">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="输入短信验证码："
        android:textSize="26sp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:id="@+id/textView"/>

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:layout_toRightOf="@+id/textView"
        android:layout_alignParentRight="true"
        android:id="@+id/et"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="确认支付"
        android:textSize="26sp"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/textView"
        android:id="@+id/btn_check"/>

</RelativeLayout>

java代码：

package com.example.myapplication;

import androidx.annotation.Nullable;
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 MainActivity12 extends AppCompatActivity {

    private TextView money;
    private Button btn_pay;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main12);

        money = findViewById(R.id.money);
        btn_pay = findViewById(R.id.btn_pay);

        btn_pay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity12.this,MainActivity13.class);
                startActivityForResult(intent,0);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode){
            case 0:
                if(resultCode == RESULT_OK){
                    money.setText(data.getStringExtra("name"));
                }
                break;
        }
    }
}

package com.example.myapplication;

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;
import android.widget.Toast;

public class MainActivity13 extends AppCompatActivity {

    private EditText et;
    private Button btn_check;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main13);

        et = findViewById(R.id.et);
        btn_check = findViewById(R.id.btn_check);

        btn_check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String text = et.getText().toString();
                String num = "9527";
                Intent intent = new Intent();
                if(text.equals("")){
                    Toast.makeText(MainActivity13.this,"验证码不能为空！",Toast.LENGTH_SHORT).show();
                    return;
                } else if(!text.equals(num)){
                    intent.putExtra("name","支付失败");
                    setResult(RESULT_OK,intent);
                    MainActivity13.this.finish();
                } else {
                    intent.putExtra("name","支付成功");
                    setResult(RESULT_OK,intent);
                    MainActivity13.this.finish();
                }
            }
        });
    }
}