基于安卓5.0 material design仿ios界面简单计算器

本人的第一篇博客,写了个简单的计算器,开学的第一个作业,适合初学者打发下时间,高手可以飘过,如有错漏之处,还望指出,定当改之

顺手贴上github 仓库地址:https://github.com/liheming/calculator

 

MainActivity.java如下

package com.example.haily.calculator;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.text.DecimalFormat;
/**author haily
* date :2016.3.26
* sample calculator 1.0
* contact qq:1325789491
*/
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private String result,oprating="";//真正的结果, //获取对应的操作符
int op1length = 0;//第一个操作数的长度,为了定位第二个操作数的起止位置
private boolean isOperate = false;//是否点击过操作符
private double op1 = 0, op2 = 0, preRes = 0;//定义操作数1,操作数2,double类型结果
private TextView text_show, text_result;//表达式和结果显示textView;
private Button one, two, three, four, five, six, seven, eight, nine, zero, add, min, mul, div, delete, dot, equ;//所有按钮
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();//调用初始化函数init()
}
//初始化各组件
private void init() {
text_show = (TextView) findViewById(R.id.text_show);
text_result = (TextView) findViewById(R.id.text_result);
text_show.setText("");
text_result.setText("");
one = (Button) this.findViewById(R.id.one);
two = (Button) this.findViewById(R.id.two);
three = (Button) this.findViewById(R.id.three);
four = (Button) this.findViewById(R.id.four);
five = (Button) this.findViewById(R.id.five);
six = (Button) this.findViewById(R.id.six);
seven = (Button) this.findViewById(R.id.seven);
eight = (Button) this.findViewById(R.id.eight);
nine = (Button) this.findViewById(R.id.nine);
zero = (Button) this.findViewById(R.id.zero);
add = (Button) this.findViewById(R.id.add);
min = (Button) this.findViewById(R.id.min);
mul = (Button) this.findViewById(R.id.mul);
div = (Button) this.findViewById(R.id.div);
delete = (Button) this.findViewById(R.id.delete);
dot = (Button) this.findViewById(R.id.dot);
equ = (Button) this.findViewById(R.id.equ);
//实现按钮监听事件
one.setOnClickListener(this);
two.setOnClickListener(this);
three.setOnClickListener(this);
four.setOnClickListener(this);
five.setOnClickListener(this);
six.setOnClickListener(this);
seven.setOnClickListener(this);
eight.setOnClickListener(this);
nine.setOnClickListener(this);
zero.setOnClickListener(this);
dot.setOnClickListener(this);
add.setOnClickListener(this);
min.setOnClickListener(this);
mul.setOnClickListener(this);
div.setOnClickListener(this);
equ.setOnClickListener(this);
delete.setOnClickListener(this);
delete.setOnLongClickListener(new View.OnLongClickListener() {//长按删除监听事件
@Override
public boolean onLongClick(View v) {
text_show.setText("");
text_result.setText("");
return true;
}
});
}
private void clickNuber(String s) {
text_show.append(s);
if (isOperate) {
equ();
}
}
@Override
public void onClick(View v) {
dot.setEnabled(true);
switch (v.getId()) {
case R.id.one:
clickNuber("1");
break;
case R.id.two:
clickNuber("2");
break;
case R.id.three:
clickNuber("3");
break;
case R.id.four:
clickNuber("4");
break;
case R.id.five:
clickNuber("5");
break;
case R.id.six:
clickNuber("6");
break;
case R.id.seven:
clickNuber("7");
break;
case R.id.eight:
clickNuber("8");
break;
case R.id.nine:
clickNuber("9");
break;
case R.id.zero:
clickNuber("0");
break;
case R.id.dot:
if (!text_show.getText().toString().equals("")) {
for (int i = 0; i < text_show.getText().length(); i++) {
if (text_show.getText().charAt(i) == '.') {
System.out.println(text_show.getText().charAt(i) == '.');
// dot.setEnabled(false);
return;
}
}
text_show.append(".");
}
break;
case R.id.add://加法
compute("+");
break;
case R.id.min://减法
compute("-");
break;
case R.id.mul://乘法
compute("×");
break;
case R.id.div://除法
compute("÷");
break;
case R.id.equ:// 计算结果
if (isOperate) {
equ();
isOperate = false;
text_show.setText(result);
text_result.setText("");
}
break;
case R.id.delete://后退和删除
if (!text_show.getText().toString().equals("")) {
text_show.setText(text_show.getText().subSequence(0, text_show.getText().length() - 1));
try {
if (isOperate) {
equ();
}
} catch (Exception e) {
text_result.setText("");
}
isOperate = false;
} else {
isOperate = false;
text_show.setText("");
}
break;
default:
}
}
private void compute(String oprate) {
if (!text_show.getText().toString().equals("")&&!isOperate) {
op1length = text_show.getText().length();
try {
op1 = Double.parseDouble(text_show.getText().toString());
text_show.append(oprate);
oprating = oprate;
isOperate = true;
} catch (Exception e) {
Log.e("TAG", "第二次按操作符");
}
// System.out.println(op1);
 text_show.setText("");
}
}
private void equ() {
if (!text_show.getText().toString().equals("")) {
System.out.println("error" + text_show.getText().toString().equals(""));
int op2Length = text_show.getText().length();
// System.out.println("op1Length"+op1length+"----op2Length"+op2Length);
String str = text_show.getText().subSequence(op1length + 1, op2Length).toString();
op2 = Double.parseDouble(str);
System.out.println(op2);
preRes = op2;
switch (oprating) {
case "+":
preRes = add(op1, op2);
break;
case "-":
preRes = min(op1, op2);
break;
case "×":
preRes = mul(op1, op2);
break;
case "÷":
preRes = div(op1, op2);
break;
}
DecimalFormat df = new DecimalFormat("#0.0");
result = df.format(preRes);
text_result.setText(result);
}
}
//以下4个方法为四则运算
public double add(double op1, double op2) {
return op1 + op2;
}
public double min(double op1, double op2) {
return op1 - op2;
}
public double mul(double op1, double op2) {
return op1 * op2;
}
public double div(double op1, double op2) {
return op1 / op2;
}
//以下为菜单初始化
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.about) {
AlertDialog builder = new AlertDialog.Builder(this).setTitle("关于")
.setMessage(
"简易计算器1.0\n小数点后保留1位小数\n长按删除所有数字\nmade by haily on 2016.3.26")
.setNegativeButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// finish();
}
}).show();
return true;
}
return super.onOptionsItemSelected(item);
}
}

layout资源文件如下