Mars0106

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

    tools:context="com.example.pengtuanyuan.myapplication.MainActivity">


    <EditText
        android:id="@+id/A"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/symbol"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <EditText
        android:id="@+id/B"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/calculate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

-------------------------------------------------------

package com.example.pengtuanyuan.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {


    private EditText a;
    private EditText b;
    private TextView symbol;
    private Button calculate;



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

        a =(EditText)findViewById(R.id.A);
        b =(EditText)findViewById(R.id.B);
        symbol =(TextView)findViewById(R.id.symbol);
        calculate =(Button)findViewById(R.id.calculate);

        symbol.setText(R.string.symbol);
        calculate.setText(R.string.calculate);

        calculate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String num1=a.getText().toString();
                String num2=b.getText().toString();
                Intent intent=new Intent(MainActivity.this,Activity2.class);
                intent.putExtra("1",num1);
                intent.putExtra("2",num2);
                startActivity(intent);

            }
        });



    }
}
-------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.pengtuanyuan.myapplication.Activity2">    <TextView        android:id="@+id/resultTextView"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></RelativeLayout>

-------------------------------------------------------

package com.example.pengtuanyuan.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class Activity2 extends AppCompatActivity {

    private TextView result;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_2);

        result=(TextView)findViewById(R.id.resultTextView);

        Intent intent=getIntent();
        String num1=intent.getStringExtra("1");
        String num2=intent.getStringExtra("2");
        int intnum1=Integer.parseInt(num1);
        int intnum2=Integer.parseInt(num2);
        int resultnum=intnum1*intnum2;
        result.setText(resultnum+"");

    }
}

FED604E1-E395-4472-ACFC-BE44B9898714.png