基于AS3.0 简易计算器

最新推荐文章于 2020-12-15 21:53:14 发布

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最新推荐文章于 2020-12-15 21:53:14 发布

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分类专栏： Android 学习文章标签： android 计算器

本文链接：https://blog.youkuaiyun.com/congcong7267/article/details/80059616

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本文介绍了一个简单的计算器应用程序的开发过程，使用Android Studio实现基本的加减乘除功能。通过两个Activity之间的交互完成运算，并展示了完整的代码示例。

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功能：计算器的加减乘除

平台：AStudio Studio 3.0.1

直接上代码：

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.lenovo.design4application">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity" />
        <activity android:name=".musicActivity">

        </activity>
        >
        <activity android:name=".WelcomeActivity" />
        <activity android:name=".A_Activity" >

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>


        </activity>
        <activity android:name=".B_Activity"></activity>
    </application>

</manifest>

activity_a_.xml:

<?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="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="输入a="
            android:textSize="24sp" />

        <EditText
            android:id="@+id/editText1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="输入b="
            android:textSize="24sp" />

        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <RadioGroup
            android:id="@+id/math"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal"
            android:visibility="visible">

            <RadioButton
                android:id="@+id/radioButton4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="/" />

            <RadioButton
                android:id="@+id/radioButton3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="*" />

            <RadioButton
                android:id="@+id/radioButton1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="+" />

            <RadioButton
                android:id="@+id/radioButton2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="-" />

        </RadioGroup>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="50dp"
            android:layout_weight="1" />
    </LinearLayout>
</LinearLayout>

A_activity.java

package com.example.lenovo.design4application;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class A_Activity extends Activity {

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


        RadioGroup rg=(RadioGroup)findViewById(R.id.math);

       rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
               @Override
               public void onCheckedChanged(RadioGroup group, int checkedId) {

               RadioButton rb=(RadioButton)findViewById(checkedId);
               EditText et1=(EditText)findViewById(R.id.editText1);
               EditText et2=(EditText)findViewById(R.id.editText2);
               String a=et1.getText().toString();
               String b=et2.getText().toString();
               String c=rb.getText().toString();
               Intent intent=new Intent(A_Activity.this,B_Activity.class);
               Bundle bundle=new Bundle();
               bundle.putString("a", a);
               bundle.putString("b", b);
               bundle.putString("c", c);

               intent.putExtras(bundle);
               startActivityForResult(intent, 100); //关键语句
           }
       });




    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode==100)
            if(resultCode==RESULT_OK){
                Bundle bundle=data.getExtras();
                int s=bundle.getInt("sum");
              //  double s=bundle.getDouble("sum");
              //  String s=bundle.getString("sum");
                TextView tv=(TextView)findViewById(R.id.textView3);
                tv.setText("结果="+s);
            }


        if(resultCode==2){
            Bundle bundle=data.getExtras();
           // int s=bundle.getInt("sum");
              double s=bundle.getDouble("sum");
             //s=bundle.getString("sum");
            TextView tv=(TextView)findViewById(R.id.textView3);
            tv.setText("结果="+s);
        }
    }
}

B_activity.java

package com.example.lenovo.design4application;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class B_Activity extends Activity {

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


        Intent intent=getIntent();
        Bundle bundle=intent.getExtras();
        String a=bundle.getString("a");
        String b=bundle.getString("b");
        String c=bundle.getString("c");
        if(c.equals("-"))
        {

            int sum=Integer.parseInt(a)-Integer.parseInt(b);
            bundle.putInt("sum", sum); //换成int数据
            intent.putExtras(bundle);
            setResult(RESULT_OK, intent); //关键语句
            finish();

        }
        if(c.equals("+")) {
            int sum = Integer.parseInt(a) + Integer.parseInt(b);
            bundle.putInt("sum", sum); //换成int数据
            intent.putExtras(bundle);
            setResult(RESULT_OK, intent); //关键语句
            finish();
        }

        if(c.equals("*")) {
            int sum = Integer.parseInt(a) * Integer.parseInt(b);
            bundle.putInt("sum", sum); //换成int数据
            intent.putExtras(bundle);
            setResult(RESULT_OK, intent); //关键语句
            finish();
        }

        if(c.equals("/")) {
         double m= Double.parseDouble(a);
            double n= Double.parseDouble (b);
            double sum =m *1.0/ n;
            bundle.putDouble("sum", sum); //换成double数据
            intent.putExtras(bundle);
            setResult(2, intent); //关键语句
            finish();
        }




    }
}