如何在Android中使用简单的计算器?如何使用“按钮"和单个编辑文本? [英] How do a simple calculator in Android? How to do it using Buttons and single edit text?
本文介绍了如何在Android中使用简单的计算器?如何使用“按钮"和单个编辑文本?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在学习Android，因此我想使事情保持简单.
I am learning Android so I want to keep things simple.
我必须添加两个数字并将结果显示在单个编辑框中.要与第二个数字相加，您必须将第一个数字存储在变量中.然后，在编辑文本中使用此变量和第二个数字进行添加.
I have to add two numbers and display the result in a single editbox. To add with the second number you have store the first number in a variable. Then later add using this variable with the second number in the edit text.
如果您查看下面的xml和Java代码，将会有一个更好的主意.提前致谢.
If you look at the xml and Java Code below you will have a better idea. Thanks in advance.
<?xml version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">
<RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/relativeLayout1" android:layout_gravity="bottom">
<Button android:text="1" android:padding="20px" android:layout_marginTop="38dp" android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/button1" android:layout_alignParentLeft="true"></Button>
<Button android:text="2" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignTop="@+id/button1" android:id="@+id/button2" android:layout_toRightOf="@+id/button1"></Button>
<Button android:text="3" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignTop="@+id/button2" android:id="@+id/button3" android:layout_toRightOf="@+id/button2"></Button>
<Button android:text="4" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignTop="@+id/button3" android:id="@+id/button4" android:layout_toRightOf="@+id/button3"></Button>
<Button android:text="5" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/button5" android:layout_below="@+id/button1" android:layout_alignParentLeft="true"></Button>
<Button android:text="6" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignTop="@+id/button5" android:layout_alignLeft="@+id/button2" android:id="@+id/button6"></Button>
<Button android:text="7" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignTop="@+id/button6" android:layout_alignLeft="@+id/button3" android:id="@+id/button7"></Button>
<Button android:text="8" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignLeft="@+id/button4" android:id="@+id/button8" android:layout_below="@+id/button4"></Button>
<Button android:text="=" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignLeft="@+id/button11" android:id="@+id/button15" android:layout_below="@+id/button12"></Button>
<Button android:text="clear" android:layout_alignRight="@+id/button8" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_alignBottom="@+id/button15" android:layout_alignLeft="@+id/button12" android:id="@+id/button16" android:layout_below="@+id/button12"></Button>
<Button android:text="-" android:layout_alignRight="@+id/button8" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/button12" android:layout_below="@+id/button8"></Button>
<Button android:text="+" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_above="@+id/button15" android:layout_toLeftOf="@+id/button16" android:id="@+id/button11"></Button>
<Button android:text="/" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_toLeftOf="@+id/button7" android:layout_alignTop="@+id/button15" android:id="@+id/button14"></Button>
<Button android:text="0" android:layout_alignRight="@+id/button14" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_above="@+id/button14" android:id="@+id/button0"></Button>
<Button android:text="*" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_toLeftOf="@+id/button10" android:layout_alignTop="@+id/button14" android:id="@+id/button13"></Button>
<Button android:text="9" android:padding="20px" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_above="@+id/button13" android:id="@+id/button9" android:layout_alignParentLeft="true"></Button>
<EditText android:id="@+id/editText1" android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_below="@+id/button14"></EditText>
</RelativeLayout>
</LinearLayout>
Java代码
package calci.tor;
import android.R.integer;
import android.R.string;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class CalculatorActivity extends Activity {
/** Called when the activity is first created. */
public EditText display;
TextView edt;
Integer c;
String a="",b;
//int d=0;
Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
edt=(EditText)findViewById(R.id.editText1);
b1=(Button)findViewById(R.id.button1);
b2=(Button)findViewById(R.id.button2);
b3=(Button)findViewById(R.id.button3);
b4=(Button)findViewById(R.id.button4);
b5=(Button)findViewById(R.id.button5);
b6=(Button)findViewById(R.id.button6);
b7=(Button)findViewById(R.id.button7);
b8=(Button)findViewById(R.id.button8);
b9=(Button)findViewById(R.id.button9);
b10=(Button)findViewById(R.id.button0);
b11=(Button)findViewById(R.id.button11);
b12=(Button)findViewById(R.id.button12);
b13=(Button)findViewById(R.id.button13);
b14=(Button)findViewById(R.id.button14);
b15=(Button)findViewById(R.id.button15);
b16=(Button)findViewById(R.id.button16);
b1.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
edt.setText(a+ "1");
}
});
b2.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
edt.setText(a+ "2");
}
});
b3.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
edt.setText(a+ "3");
}
});
b4.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
edt.setText(a+ "4");
}
});
b5.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
edt.setText(a+ "5");
}
});
b6.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
edt.setText(a+ "6");
}
});
b7.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
edt.setText(a+ "7");
}
});
b8.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
edt.setText(a+ "8");
}
});
b9.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
edt.setText(a+ "9");
}
});
b10.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
edt.setText(a+ "0");
}
});
b11.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
String aa;
aa=a; //To Store the first number displayed in edit text to aa
edt.setText("+");
edt.setText("");
//d=1;
c=Integer.parseInt(aa)+Integer.parseInt(a);
}
});
b12.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
edt.setText("-");
}
});
b13.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
edt.setText("*");
}
});
b14.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
edt.setText("/");
}
});
b15.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
//int c=Integer.parseInt(a)+Integer.parseInt(b);
//edt.setText(c);
display.setText(c);
}
});
b16.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
edt.setText("");
}
});
}
}
推荐答案
//Below having correct programming .
//I did some changes in your code.This code was working nicely try this.
//`import android.os.Bundle;
import android.R.integer;
import android.R.string;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
public EditText display;
TextView edt;
Integer c,d,r,b;
String a="0",aa;
Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edt=(EditText)findViewById(R.id.editText1);
b1=(Button)findViewById(R.id.button1);
b2=(Button)findViewById(R.id.button2);
b3=(Button)findViewById(R.id.button3);
b4=(Button)findViewById(R.id.button4);
b5=(Button)findViewById(R.id.button5);
b6=(Button)findViewById(R.id.button6);
b7=(Button)findViewById(R.id.button7);
b8=(Button)findViewById(R.id.button8);
b9=(Button)findViewById(R.id.button9);
b10=(Button)findViewById(R.id.button0);
b11=(Button)findViewById(R.id.button11);
b12=(Button)findViewById(R.id.button12);
b13=(Button)findViewById(R.id.button13);
b14=(Button)findViewById(R.id.button14);
b15=(Button)findViewById(R.id.button15);
b16=(Button)findViewById(R.id.button16);
b1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
a=a+"1";
edt.setText(a);
}
});
b2.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
a=a+"2";
edt.setText(a);
}
});
b3.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
a=a+"3";
edt.setText(a);
}
});
b4.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
a=a+"4";
edt.setText(a);
}
});
b5.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
a=a+"5";
edt.setText(a);
}
});
b6.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
a=a+"6";
edt.setText(a);
}
});
b7.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
a=edt.getText().toString();
a=a+"7";
edt.setText(a);
}
});
b8.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
a=a+"8";
edt.setText(a);
}
});
b9.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
a=a+"9";
edt.setText(a);
}
});
b10.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
a=edt.getText().toString();
a=a+"0";
edt.setText(a);
}
});
b11.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
aa=a;
b=1;
a="";
edt.setText("+");
edt.setText("");
}
});
b12.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
aa=a;
b=2;
a="";
edt.setText("-");
edt.setText("");
}
});
b13.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
aa=a;
b=3;
a="";
edt.setText("*");
edt.setText("");
}
});
b14.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
aa=a;
b=4;
a="";
edt.setText("/");
edt.setText("");
}
});
b15.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
if(b==1){
c=Integer.parseInt(aa);
d=Integer.parseInt(a);
r=c+d;
}
else
if(b==4){
c=Integer.parseInt(aa);
d=Integer.parseInt(a);
r=c/d;
}else
if(b==2){
c=Integer.parseInt(aa);
d=Integer.parseInt(a);
r=c-d;
}
else
if(b==3){
c=Integer.parseInt(aa);
d=Integer.parseInt(a);
r=c*d;
}
Toast.makeText(MainActivity.this, "Result is::"+r, 10000).show();
c=0;
b=0;
d=0;
a="";
aa="";
edt.setText("");
}
});
b16.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {
// TODO Auto-generated method stub
edt.setText("");
}
});
}`
这篇关于如何在Android中使用简单的计算器?如何使用“按钮"和单个编辑文本?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
