作业四

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   >
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:id="@+id/line1"
    android:layout_marginTop="80dp">
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:textSize="18sp"
       android:layout_weight="1"
        android:text="请输入第一个数"
        />
    <EditText
        android:id="@+id/lin1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="2"
        />

</LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:id="@+id/line2"
        android:layout_below="@id/line1"
        android:layout_marginTop="10dp">
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:textSize="18sp"
            android:layout_weight="1"
            android:text="请输入第二个数"
            />
        <EditText
            android:id="@+id/lin2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            />

    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:id="@+id/line3"
        android:layout_below="@id/line2"
        android:layout_marginTop="10dp">
        <RadioGroup
            android:id="@+id/radio"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <RadioButton
                android:id="@+id/jia"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:layout_weight="1"
                android:text="+"/>
            <RadioButton
                android:id="@+id/jian"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:layout_weight="1"
                android:text="-"/>
            <RadioButton
                android:id="@+id/cheng"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:layout_weight="1"
                android:text="*"/>
            <RadioButton
                android:id="@+id/chu"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:layout_weight="1"
                android:text="/"/>

        </RadioGroup>



    </LinearLayout>
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:layout_below="@id/line3"
        android:layout_centerInParent="true"
        android:layout_marginTop="10dp"
        />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        android:layout_centerInParent="true"
        android:layout_below="@id/text"
        android:layout_marginTop="30dp"
        />


</RelativeLayout>

package cn.itcase.calc;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
private RadioGroup radioGroup;
private TextView textView;
private EditText editText1,editText2;
private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        radioGroup = (RadioGroup) findViewById(R.id.radio);
        textView = (TextView) findViewById(R.id.text);
        editText1 = (EditText) findViewById(R.id.lin1);
        editText2 = (EditText) findViewById(R.id.lin2);
        button=(Button)findViewById(R.id.button1) ;
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                editText1.setText("");
                editText2.setText("");
                textView.setText("");
            }
        });
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
        {
            public void onCheckedChanged (RadioGroup group,int checkId){
            if (checkId == R.id.jia) {
                String jiaf1 = editText1.getText().toString();
                Double jiaf4= Double.parseDouble(jiaf1);
                String jiaf2 = editText2.getText().toString();
                Double jiad3=Double.parseDouble(jiaf2);
                Double  jiaf5=jiad3+jiaf4;
                textView.setText("计算结果为" +jiaf5);
            }
            else if (checkId == R.id.jian) {
                String jianf1 = editText1.getText().toString();
                Double jianf4= Double.parseDouble(jianf1);
                String jianf2 = editText2.getText().toString();
                Double jiand3=Double.parseDouble(jianf2);
                Double  jianf5=jianf4-jiand3;
                textView.setText("计算结果为" +jianf5);
         } else if (checkId == R.id.cheng) {
               String chengf1 = editText1.getText().toString();
               Double chengf4= Double.parseDouble(chengf1);
               String chengf2 = editText2.getText().toString();
               Double chengd3=Double.parseDouble(chengf2);
               Double  chengf5=chengd3*chengf4;
               textView.setText("计算结果为" +chengf5);
            } else if (checkId == R.id.chu) {
                String chuf1 = editText1.getText().toString();
                Double chuf4= Double.parseDouble(chuf1);
                String chuf2 = editText2.getText().toString();
                Double chud3=Double.parseDouble(chuf2);
                Double  chuf5=chuf4/chud3;
                textView.setText("计算结果为" +chuf5);
            }
        }
        });

    }

}