作业四

package com.example.yuhang;

import android.support.v7.app.ActionBarActivity;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;

@SuppressLint("NewApi")
public class MainActivity extends ActionBarActivity implements OnClickListener {
private RadioGroup radioGroup;
private TextView textView;
EditText num1, num2;
private Button bt;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
radioGroup = (RadioGroup) findViewById(R.id.rdg);
textView = (TextView) findViewById(R.id.textView3);
num1 = (EditText) findViewById(R.id.editText1);
num2 = (EditText) findViewById(R.id.editText2);
bt=(Button) findViewById(R.id.button1);
bt.setOnClickListener(this);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@SuppressLint("NewApi")
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
switch (checkedId) {
case R.id.radioButton1:
if (!num1.getText().toString().isEmpty() && !num2.getText().toString().isEmpty()) {
double n1 = Double.parseDouble(num1.getText().toString());
double n2 = Double.parseDouble(num2.getText().toString());
double res = n1 + n2;
textView.setText(String.valueOf(res));
break;
}
case R.id.radioButton2:
if (!num1.getText().toString().isEmpty() && !num2.getText().toString().isEmpty()) {
double n1 = Double.parseDouble(num1.getText().toString());
double n2 = Double.parseDouble(num2.getText().toString());
double res = n1 - n2;
textView.setText(String.valueOf(res));
break;
}
case R.id.radioButton3:
if (!num1.getText().toString().isEmpty() && !num2.getText().toString().isEmpty()) {
double n1 = Double.parseDouble(num1.getText().toString());
double n2 = Double.parseDouble(num2.getText().toString());
double res = n1 * n2;
textView.setText(String.valueOf(res));
break;
}
case R.id.radioButton4:
if (!num1.getText().toString().isEmpty() && !num2.getText().toString().isEmpty()) {
double n1 = Double.parseDouble(num1.getText().toString());
double n2 = Double.parseDouble(num2.getText().toString());
double res = n1 / n2;
textView.setText(String.valueOf(res));
break;
}
}
}
});

}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
num1.setText(null);
num2.setText(null);
textView.setText(" ");
}
}

 

 

 

<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.yuhang.MainActivity" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:textSize="20sp"
android:text="输入第一个数:" />

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView1"
android:layout_alignTop="@+id/textView1"
android:background="@null"
android:layout_toRightOf="@+id/textView1"
android:ems="10" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_marginTop="10dp"
android:text="输入第二个数:"
android:textSize="20sp" />

<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView2"
android:layout_alignLeft="@+id/editText1"
android:layout_alignTop="@+id/textView2"
android:background="@null"
android:ems="10" />
<RadioGroup
android:id="@+id/rdg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="@+id/textView2"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp"
>
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+" />

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

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

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

<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/rdg"
android:layout_centerHorizontal="true"
android:textSize="20sp"
android:layout_marginTop="50dp"
android:text="计算结果为:" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView3"
android:layout_centerHorizontal="true"
android:layout_marginTop="58dp"
android:onClick="ccc"
android:text="全部清除" />

</RelativeLayout>

 

转载于:https://www.cnblogs.com/cunhua/p/11532202.html