计算器实例
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.GridLayout;
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];
private GridLayout gly;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gly=(GridLayout)findViewById(R.id.gly);
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;
gly.setBackgroundResource(R.drawable.jz);
}
}
}
});
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;
gly.setBackgroundResource(R.drawable.js);
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;
gly.setBackgroundResource(R.drawable.js);
}
}
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:
if(!num.equals("0"))
num = BigDecimal.valueOf(1).divide(new BigDecimal(num),12,BigDecimal.ROUND_UP).stripTrailingZeros()
.toString();
break;
case R.id.txtb:
num = new BigDecimal(num).divide(BigDecimal.valueOf(100),12,BigDecimal.ROUND_UP).stripTrailingZeros()
.toString();
break;
case R.id.txtv:
Double numss = Math.sqrt(new BigDecimal(num).doubleValue());
int stratindex=numss.toString().contains(".")?numss.toString().indexOf("."):0;
num = numss.toString().length()>13?numss.toString().substring(0, 12+stratindex):numss.toString();
}
print.setText(num);
flg=0;
num = "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;
}
}
