Android实现简易计算器（页面跳转和数据传输）
16lz
2022-03-16
一、效果图
二、代码
- 首页布局
<?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" tools:context=".MainActivity" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第一个数：" android:textSize="20sp"/> <EditText android:id="@+id/num1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1"/> LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第二个数：" android:textSize="20sp"/> <EditText android:id="@+id/num2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1"/> LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="计算类型：" android:textSize="20sp"/> <EditText android:id="@+id/calcType" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <Button android:id="@+id/selectType" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="选择" /> LinearLayout> <Button android:id="@+id/result" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="计算"/>LinearLayout>- 首页Java
package com.lee.calc;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.os.Bundle;import android.text.Editable;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.RelativeLayout;import java.lang.reflect.Type;public class MainActivity extends AppCompatActivity { EditText num1; EditText num2; EditText calcType; Button selectType; Button result; int ans; String type; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); num1 = findViewById(R.id.num1); num2 = findViewById(R.id.num2); calcType = findViewById(R.id.calcType); selectType = findViewById(R.id.selectType); result = findViewById(R.id.result); selectType.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this, TypeActivity.class); startActivityForResult(intent,1); } }); result.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int num1 = Integer.parseInt(MainActivity.this.num1.getText().toString()); int num2 = Integer.parseInt(MainActivity.this.num2.getText().toString()); String type = calcType.getText().toString(); switch(type){ case "加法": ans = num1 + num2; type = "+"; break; case "减法": ans = num1 - num2; type = "-"; break; case "乘法": ans = num1 * num2; type = "*"; break; case "除法": ans = num1 / num2; type = "/"; break; } Intent intent = new Intent(MainActivity.this, ResultActivity.class); intent.putExtra("num1",num1); intent.putExtra("num2",num2); intent.putExtra("ans",ans); intent.putExtra("type",type); startActivity(intent); } }); } protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { if(requestCode == 1 && resultCode == 2){ calcType.setText(data.getStringExtra("type")); } }}- 类型选择页面布局
<?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" tools:context=".TypeActivity" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="请选择要计算的类型" android:textSize="20sp"/> <RadioGroup android:id="@+id/typeGroup" android:layout_width="wrap_content" android:layout_height="wrap_content"> <RadioButton android:id="@+id/add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="加" android:textSize="20sp"/> <RadioButton android:id="@+id/sub" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="减" android:textSize="20sp"/> <RadioButton android:id="@+id/mul" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="乘" android:textSize="20sp"/> <RadioButton android:id="@+id/div" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="除" android:textSize="20sp"/> RadioGroup> <Button android:id="@+id/confirmType" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="确定" android:textSize="20sp"/>LinearLayout>- 类型选择页面Java
package com.lee.calc;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.RadioButton;import android.widget.RadioGroup;public class TypeActivity extends AppCompatActivity { RadioButton add; RadioButton sub; RadioButton mul; RadioButton div; RadioGroup typeGroup; Button confirmType; String type; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_type); typeGroup = findViewById(R.id.typeGroup); add = findViewById(R.id.add); sub = findViewById(R.id.sub); mul = findViewById(R.id.mul); div = findViewById(R.id.div); confirmType = findViewById(R.id.confirmType); confirmType.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(add.isChecked()){ type = "加法"; } if(sub.isChecked()){ type = "减法"; } if(mul.isChecked()){ type = "乘法"; } if(div.isChecked()){ type = "除法"; } System.out.println(type); Intent intent = new Intent(); intent.putExtra("type",type); setResult(2,intent); finish(); } }); }}- 结果页布局
<?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" tools:context=".ResultActivity" android:orientation="vertical"> <EditText android:id="@+id/resultShow" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="25sp"/>LinearLayout>- 结果页Java
package com.lee.calc;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.os.Bundle;import android.widget.EditText;public class ResultActivity extends AppCompatActivity { EditText resultShow; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_result); resultShow = findViewById(R.id.resultShow); Intent intent = getIntent(); int num1 = intent.getIntExtra("num1", 0); int num2 = intent.getIntExtra("num2", 0); int ans = intent.getIntExtra("ans", 0); String type = intent.getStringExtra("type"); String result = num1 + " " + type + " " + num2 + "=" + ans; resultShow.setText(result); }}更多相关文章
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