第五次作业

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1.xml代码

<?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:layout_margin="20dp"    

tools:context=".MainActivity"    

android:orientation="vertical"   

 android:background="@mipmap/p30">    

<LinearLayout        

android:layout_marginTop="55dp"        

android:layout_width="match_parent"       

 android:layout_height="wrap_content"       

 android:orientation="horizontal">        

 

<TextView           

 android:id="@+id/text1"           

 android:layout_width="0dp"            

android:layout_height="wrap_content"            

android:text="输入第一个数:"            

android:textSize="25sp"            

android:layout_weight="1.25"            

android:gravity="center"/>       

 

 <EditText            

android:id="@+id/edt1"           

 android:layout_width="0dp"            

android:layout_height="wrap_content"           

 android:layout_weight="1"            

android:gravity="center"           

 android:textSize="25sp" />    

</LinearLayout>   

 <LinearLayout        

android:layout_width="match_parent"        

android:layout_height="wrap_content"        

android:orientation="horizontal"        

android:layout_marginTop="10dp">        

<TextView           

 android:id="@+id/text2"            

android:layout_width="0dp"            

android:layout_height="wrap_content"            

android:text="输入第二个数:"           

 android:textSize="25sp"            

android:layout_weight="1.25"            

android:gravity="center"/>       

 <EditText            

android:id="@+id/edt2"           

 android:layout_width="0dp"            

android:layout_height="wrap_content"           

 android:layout_weight="1"           

 android:textSize="25sp"            

android:gravity="center"/>   

 </LinearLayout>    

<RadioGroup        

android:id="@+id/rgp1"       

 android:layout_width="match_parent"        

android:layout_height="wrap_content"       

 android:layout_marginTop="45dp"       

 android:layout_marginLeft="35dp"        

android:layout_marginRight="35dp"        

android:orientation="horizontal">        

<RadioButton            

android:id="@+id/rbn1"           

 android:layout_width="wrap_content"            

android:layout_height="wrap_content"            

android:text="+"           

 android:textSize="32sp"          

  android:layout_weight="1"            

android:checked="false"/>        

<RadioButton           

 android:id="@+id/rbn2"           

 android:layout_width="wrap_content"          

  android:layout_height="wrap_content"           

 android:text="-"            

android:textSize="32sp"            

android:layout_weight="1"            

android:checked="false"/>        

<RadioButton            

android:id="@+id/rbn3"           

 android:layout_width="wrap_content"           

 android:layout_height="wrap_content"          

  android:text="*"            

android:textSize="32sp"            

android:layout_weight="1"           

 android:checked="false"/>       

 <RadioButton            

android:id="@+id/rbn4"           

 android:layout_width="wrap_content"            

android:layout_height="wrap_content"           

 android:text="/"           

 android:textSize="32sp"            

android:layout_weight="1"            

android:checked="false"/>    

</RadioGroup>    

<RelativeLayout        

android:layout_width="match_parent"        

android:layout_height="wrap_content"       

 android:layout_marginTop="25dp">       

 <TextView            

android:id="@+id/text3"            

android:layout_width="wrap_content"           

 android:layout_height="wrap_content"           

 android:layout_centerHorizontal="true"           

 android:text="计算结果为"            

android:textSize="25sp"/>       

 <TextView            

android:id="@+id/text4"           

 android:layout_width="wrap_content"           

 android:layout_height="wrap_content"           

 android:layout_marginTop="12dp"            

android:layout_centerHorizontal="true"            

android:layout_below="@+id/text3"            

android:textSize="25sp"            

android:textColor="#333fff"/>    

</RelativeLayout>    

<RelativeLayout       

 android:layout_width="match_parent"        

android:layout_height="wrap_content">        

<Button           

 android:id="@+id/btn1"            

android:layout_width="wrap_content"           

 android:layout_height="wrap_content"           

 android:layout_marginTop="20dp"           

 android:layout_centerHorizontal="true"            

android:text="归零"            

android:textSize="25s

 android:background="#333fff"           

android:onClick="test"/>   

</RelativeLayout>

</LinearLayout>   

android:background="#333fff"           

android:onClick="test"/>   

</RelativeLayout>

</LinearLayout>

 

2.java代码

package com.example.myapplication;import android.os.Bundle;

import android.view.View;import android.widget.EditText;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.TextView;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {   

TextView text4;   

EditText e1;   

EditText e2;   

@Override   

protected void onCreate(Bundle savedInstanceState) {  

    super.onCreate(savedInstanceState);       

   setContentView(R.layout.activity_main);       

   text4 = findViewById(R.id.text4);      

  final RadioButton c1 = findViewById(R.id.rbn1);     

  final RadioButton c2 = findViewById(R.id.rbn2);      

  final RadioButton c3 = findViewById(R.id.rbn3);      

  final RadioButton c4 = findViewById(R.id.rbn4);       

 RadioGroup rgp = (RadioGroup) findViewById(R.id.rgp1);     

  rgp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {   

         @Override          

  public void onCheckedChanged(RadioGroup radioGroup, int i) {final String t1;final String t2;

e1 = findViewById(R.id.edt1);

e2 = findViewById(R.id.edt2);              

t1 = e1.getText().toString();               

t2 = e2.getText().toString();               

float num1 = Float.parseFloat(t1);               

float num2 = Float.parseFloat(t2);               

if (c1.isChecked()) { float plus = num1 + num2;   

text4.setText(plus + "");                }             

   if (c2.isChecked()) { float subtract = num1 - num2;

                                    text4.setText(subtract + "");                }               

   if (c3.isChecked()) { float ride = num1 * num2; 

                                    text4.setText(ride + "");                }               

  if (c4.isChecked()) { float division = num1 / num2;  

                                  text4.setText(division + "");                }              }        });    }  

  public void test(View view) {        e1.setText("");        e2.setText("");        text4.setText("");      

       Toast.makeText(MainActivity.this, "已清空", Toast.LENGTH_SHORT).show();    }}

 

3.图片

 

 

 

 

 

 

 

 

 

 

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1.xml代码

<?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:layout_margin="20dp"    

tools:context=".MainActivity"    

android:orientation="vertical"   

 android:background="@mipmap/p30">    

<LinearLayout        

android:layout_marginTop="55dp"        

android:layout_width="match_parent"       

 android:layout_height="wrap_content"       

 android:orientation="horizontal">        

 

<TextView           

 android:id="@+id/text1"           

 android:layout_width="0dp"            

android:layout_height="wrap_content"            

android:text="输入第一个数:"            

android:textSize="25sp"            

android:layout_weight="1.25"            

android:gravity="center"/>       

 

 <EditText            

android:id="@+id/edt1"           

 android:layout_width="0dp"            

android:layout_height="wrap_content"           

 android:layout_weight="1"            

android:gravity="center"           

 android:textSize="25sp" />    

</LinearLayout>   

 <LinearLayout        

android:layout_width="match_parent"        

android:layout_height="wrap_content"        

android:orientation="horizontal"        

android:layout_marginTop="10dp">        

<TextView           

 android:id="@+id/text2"            

android:layout_width="0dp"            

android:layout_height="wrap_content"            

android:text="输入第二个数:"           

 android:textSize="25sp"            

android:layout_weight="1.25"            

android:gravity="center"/>       

 <EditText            

android:id="@+id/edt2"           

 android:layout_width="0dp"            

android:layout_height="wrap_content"           

 android:layout_weight="1"           

 android:textSize="25sp"            

android:gravity="center"/>   

 </LinearLayout>    

<RadioGroup        

android:id="@+id/rgp1"       

 android:layout_width="match_parent"        

android:layout_height="wrap_content"       

 android:layout_marginTop="45dp"       

 android:layout_marginLeft="35dp"        

android:layout_marginRight="35dp"        

android:orientation="horizontal">        

<RadioButton            

android:id="@+id/rbn1"           

 android:layout_width="wrap_content"            

android:layout_height="wrap_content"            

android:text="+"           

 android:textSize="32sp"          

  android:layout_weight="1"            

android:checked="false"/>        

<RadioButton           

 android:id="@+id/rbn2"           

 android:layout_width="wrap_content"          

  android:layout_height="wrap_content"           

 android:text="-"            

android:textSize="32sp"            

android:layout_weight="1"            

android:checked="false"/>        

<RadioButton            

android:id="@+id/rbn3"           

 android:layout_width="wrap_content"           

 android:layout_height="wrap_content"          

  android:text="*"            

android:textSize="32sp"            

android:layout_weight="1"           

 android:checked="false"/>       

 <RadioButton            

android:id="@+id/rbn4"           

 android:layout_width="wrap_content"            

android:layout_height="wrap_content"           

 android:text="/"           

 android:textSize="32sp"            

android:layout_weight="1"            

android:checked="false"/>    

</RadioGroup>    

<RelativeLayout        

android:layout_width="match_parent"        

android:layout_height="wrap_content"       

 android:layout_marginTop="25dp">       

 <TextView            

android:id="@+id/text3"            

android:layout_width="wrap_content"           

 android:layout_height="wrap_content"           

 android:layout_centerHorizontal="true"           

 android:text="计算结果为"            

android:textSize="25sp"/>       

 <TextView            

android:id="@+id/text4"           

 android:layout_width="wrap_content"           

 android:layout_height="wrap_content"           

 android:layout_marginTop="12dp"            

android:layout_centerHorizontal="true"            

android:layout_below="@+id/text3"            

android:textSize="25sp"            

android:textColor="#333fff"/>    

</RelativeLayout>    

<RelativeLayout       

 android:layout_width="match_parent"        

android:layout_height="wrap_content">        

<Button           

 android:id="@+id/btn1"            

android:layout_width="wrap_content"           

 android:layout_height="wrap_content"           

 android:layout_marginTop="20dp"           

 android:layout_centerHorizontal="true"            

android:text="归零"            

android:textSize="25s

 android:background="#333fff"           

android:onClick="test"/>   

</RelativeLayout>

</LinearLayout>   

android:background="#333fff"           

android:onClick="test"/>   

</RelativeLayout>

</LinearLayout>

 

2.java代码

package com.example.myapplication;import android.os.Bundle;

import android.view.View;import android.widget.EditText;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.TextView;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {   

TextView text4;   

EditText e1;   

EditText e2;   

@Override   

protected void onCreate(Bundle savedInstanceState) {  

    super.onCreate(savedInstanceState);       

   setContentView(R.layout.activity_main);       

   text4 = findViewById(R.id.text4);      

  final RadioButton c1 = findViewById(R.id.rbn1);     

  final RadioButton c2 = findViewById(R.id.rbn2);      

  final RadioButton c3 = findViewById(R.id.rbn3);      

  final RadioButton c4 = findViewById(R.id.rbn4);       

 RadioGroup rgp = (RadioGroup) findViewById(R.id.rgp1);     

  rgp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {   

         @Override          

  public void onCheckedChanged(RadioGroup radioGroup, int i) {final String t1;final String t2;

e1 = findViewById(R.id.edt1);

e2 = findViewById(R.id.edt2);              

t1 = e1.getText().toString();               

t2 = e2.getText().toString();               

float num1 = Float.parseFloat(t1);               

float num2 = Float.parseFloat(t2);               

if (c1.isChecked()) { float plus = num1 + num2;   

text4.setText(plus + "");                }             

   if (c2.isChecked()) { float subtract = num1 - num2;

                                    text4.setText(subtract + "");                }               

   if (c3.isChecked()) { float ride = num1 * num2; 

                                    text4.setText(ride + "");                }               

  if (c4.isChecked()) { float division = num1 / num2;  

                                  text4.setText(division + "");                }              }        });    }  

  public void test(View view) {        e1.setText("");        e2.setText("");        text4.setText("");      

       Toast.makeText(MainActivity.this, "已清空", Toast.LENGTH_SHORT).show();    }}

 

3.图片