Android之一个简单计算器源代码
通过Android4.0 网格布局GridLayout来实现一个简单的计算器界面布局 源码如下(欢迎大家指导 批评 )
package com.android.xiong.gridlayoutTest;
import java.math.BigDecimal;
import java.util.regex.Pattern;
import com.android.xiong.gridlayoutTest.R.id;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
private EditText print;
private static String fistNumber = "0";// 第一次输入的值
private static String secondNumber = "0";// 第二次输入的值
private static String num = "0";// 显示的结果
private static int flg = 0;// 结果累加一次
public Counts take = null;
private int[] btidTake = { R.id.txtdivide, R.id.txtx, R.id.txtmin,
R.id.txttakesum };
private Button[] buttonTake = new Button[btidTake.length];
private int[] btidNum = { R.id.txt0, R.id.txt1, R.id.txt2, R.id.txt3,
R.id.txt4, R.id.txt5, R.id.txt6, R.id.txt7, R.id.txt8, R.id.txt9,
R.id.txtspl };
private Button[] buttons = new Button[btidNum.length];
private int[] btcl = { R.id.chars, R.id.charx, R.id.txtb, R.id.txtv };
private Button[] btcls = new Button[btcl.length];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
print = (EditText) findViewById(R.id.print);
print.setText("0");
print.setEnabled(false);
GetNumber get = new GetNumber();
for (int i = 0; i < btidNum.length; i++) {
buttons[i] = (Button) findViewById(btidNum[i]);
buttons[i].setOnClickListener(get);
}
Compute cm = new Compute();
for (int i = 0; i < btidTake.length; i++) {
buttonTake[i] = (Button) findViewById(btidTake[i]);
buttonTake[i].setOnClickListener(cm);
}
Button eq = (Button) findViewById(R.id.txteq);
eq.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (flg == 0) {
secondNumber = print.getText().toString();
if (take == Counts.DIVIDE && secondNumber.equals("0")) {
print.setText("0不能为被除数");
} else {
num = take.Values(fistNumber, secondNumber);
fistNumber = num;
secondNumber = "0";
print.setText(num);
flg = 1;
}
}
}
});
Button cleargo = (Button) findViewById(R.id.cleargo);
cleargo.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (num.length() > 1) {
num = num.substring(0, num.length() - 1);
} else {
num = "0";
}
print.setText(num);
}
});
Button clear = (Button) findViewById(R.id.clear);
clear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
num = "0";
fistNumber = secondNumber = num;
print.setText(num);
flg = 0;
}
});
for (int i = 0; i < btcl.length; i++) {
btcls[i] = (Button) findViewById(btcl[i]);
btcls[i].setOnClickListener(new OnTake());
}
}
// 给 EditText赋值
class GetNumber implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (flg == 1)
num = "0";
if (num.equals("0")) {
print.setText("");
num = v.getId() == R.id.txtspl ? "0" : "";
}
String txt = ((Button) v).getText().toString();
boolean s = Pattern.matches("(\\d+).?(\\d)*", num + txt);
num = s ? (num + txt) : num;
print.setText(num);
}
}
// 根据条件计算
class Compute implements OnClickListener {
@Override
public void onClick(View arg0) {
fistNumber = print.getText().toString();
// TODO Auto-generated method stub
switch (arg0.getId()) {
case R.id.txttakesum:
take = Counts.ADD;
break;
case R.id.txtmin:
take = Counts.MINUS;
break;
case R.id.txtx:
take = Counts.MULTIPLY;
break;
case R.id.txtdivide:
take = Counts.DIVIDE;
break;
}
num = "0";
flg = 0;
}
}
class OnTake implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.chars:
num = "-" + num;
break;
case R.id.charx:
num = BigDecimal.valueOf(1).divide(new BigDecimal(num))
.toString();
break;
case R.id.txtb:
num = new BigDecimal(num).divide(BigDecimal.valueOf(100))
.toString();
break;
case R.id.txtv:
Double numss = Math.sqrt(new BigDecimal(num).doubleValue());
num = numss.toString();
}
print.setText(num);
flg=0;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
package com.android.xiong.gridlayoutTest;
import java.math.BigDecimal;
public enum Counts {
ADD, MINUS, MULTIPLY, DIVIDE, MARK, ROOT;
public String Values(String num1, String num2) {
BigDecimal number1 = new BigDecimal(num1);
BigDecimal number2 = new BigDecimal(num2);
BigDecimal number = BigDecimal.valueOf(0);
switch (this) {
case ADD:
number = number1.add(number2);
break;
case MINUS:
number = number1.subtract(number2);
break;
case MULTIPLY:
number = number1.multiply(number2);
break;
case DIVIDE:
number = number1.divide(number2,20,BigDecimal.ROUND_UP);
break;
}
return number.toString();
}
}
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40px"
android:columnCount="5"
android:rowCount="6"
tools:context=".MainActivity" >
<EditText
android:id="@+id/print"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_columnSpan="5"
android:layout_marginLeft="2px"
android:layout_marginRight="2px"
android:layout_row="0"
android:background="#eee" />
<Button
android:id="@+id/cleargo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="1"
android:text="《--" />
<Button
android:id="@+id/clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="3"
android:layout_columnSpan="2"
android:layout_row="1"
android:layout_gravity="fill_horizontal"
android:text="清屏" />
<Button
android:id="@+id/chars"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="1"
android:text="-/+" />
<Button
android:id="@+id/charx"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_row="1"
android:text="1/x" />
<Button
android:id="@+id/txt7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="2"
android:text="7" />
<Button
android:id="@+id/txt8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="2"
android:text="8" />
<Button
android:id="@+id/txt9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_row="2"
android:text="9" />
<Button
android:id="@+id/txtdivide"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="3"
android:layout_row="2"
android:text="÷" />
<Button
android:id="@+id/txtb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="4"
android:layout_row="2"
android:text="%" />
<Button
android:id="@+id/txt4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="3"
android:text="4" />
<Button
android:id="@+id/txt5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="3"
android:text="5" />
<Button
android:id="@+id/txt6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_row="3"
android:text="6" />
<Button
android:id="@+id/txtx"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="3"
android:layout_row="3"
android:text="X" />
<Button
android:id="@+id/txtv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="4"
android:layout_row="3"
android:text="√" />
<Button
android:id="@+id/txt1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_row="4"
android:text="1" />
<Button
android:id="@+id/txt2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_row="4"
android:text="2" />
<Button
android:id="@+id/txt3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_row="4"
android:text="3" />
<Button
android:id="@+id/txtmin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="3"
android:layout_row="4"
android:text="-" />
<Button
android:id="@+id/txteq"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="4"
android:layout_gravity="fill_vertical"
android:layout_row="4"
android:layout_rowSpan="2"
android:text="=" />
<Button
android:id="@+id/txt0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_columnSpan="2"
android:layout_gravity="fill_horizontal"
android:layout_row="5"
android:text="0" />
<Button
android:id="@+id/txtspl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_row="5"
android:text="." />
<Button
android:id="@+id/txttakesum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="3"
android:layout_row="5"
android:text="+" />
</GridLayout>