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Android Studio 2.3 陽春型計算機進階版

Temperature: 0 °C

ChungChung
author_tools


Android Studio 2.3 陽春型計算機進階版
將之前的陽春型計算機用了不怎麼聰明的方式改善了幾個地方。

首先,將數字的宣告由int變成了double,這是為了讓運算答案能夠顯示小數點。

加上了含稅跟未稅的按鈕。

MainActivity.java部分

package com.innstory.calculator;



import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.text.NumberFormat;
import android.widget.EditText;



public class MainActivity extends AppCompatActivity
implements View.OnClickListener, View.OnLongClickListener{

//定義變數
EditText ans_list_s,ans_list;//輸出點擊按鈕及輸出結果
Button bt1,bt2,bt3,bt4,bt5,bt6,bt7,bt8,bt9,bt0,bt_add,bt_less,bt_Multiply
,bt_except,bt_ac,bt_answer,bt_dot,bt_Tax,bt_noTax;//按鈕
double previous = 0;//儲存上1筆資料
double counter = 0; //目前的值
double counter_ = 0;//原運算值
String Operation;//運算符號
String dot;//符號


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ans_list = (EditText) findViewById(R.id.ans_list);
ans_list_s = (EditText) findViewById(R.id.ans_list_s);
bt1 = (Button) findViewById(R.id.button1);
bt2 = (Button) findViewById(R.id.button2);
bt3 = (Button) findViewById(R.id.button3);
bt4 = (Button) findViewById(R.id.button4);
bt5 = (Button) findViewById(R.id.button5);
bt6 = (Button) findViewById(R.id.button6);
bt7 = (Button) findViewById(R.id.button7);
bt8 = (Button) findViewById(R.id.button8);
bt9 = (Button) findViewById(R.id.button9);
bt0 = (Button) findViewById(R.id.button0);
bt_add = (Button) findViewById(R.id.button_add);
bt_less = (Button) findViewById(R.id.button_less);
bt_Multiply = (Button) findViewById(R.id.button_Multiply);
bt_except = (Button) findViewById(R.id.button_except);
bt_ac = (Button) findViewById(R.id.button_ac);
bt_answer = (Button) findViewById(R.id.button_answer);
bt_dot = (Button) findViewById(R.id.button_dot);
bt_Tax = (Button) findViewById(R.id.button_Tax);
bt_noTax = (Button) findViewById(R.id.button_noTax);

bt1.setOnClickListener(this);
bt2.setOnClickListener(this);
bt3.setOnClickListener(this);
bt4.setOnClickListener(this);
bt5.setOnClickListener(this);
bt6.setOnClickListener(this);
bt7.setOnClickListener(this);
bt8.setOnClickListener(this);
bt9.setOnClickListener(this);
bt0.setOnClickListener(this);
bt_dot.setOnClickListener(this);
bt_add.setOnClickListener(this);
bt_less.setOnClickListener(this);
bt_Multiply.setOnClickListener(this);
bt_except.setOnClickListener(this);
bt_ac.setOnClickListener(this);
bt_answer.setOnClickListener(this);
bt_Tax.setOnClickListener(this);
bt_noTax.setOnClickListener(this);

}



@Override
public void onClick(View v) {

NumberFormat nf = NumberFormat.getInstance(); // 數字格式
nf.setMaximumFractionDigits(4); // 限制小數第四位

if (v.getId() == R.id.button1){

if (dot != null){

if (dot == "1"){
counter = counter + 0.01;
}else {
counter = counter / 10 + 1 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 1; // x 10 原因為了進位
}

ans_list.setText(ans_list.getText() + "1");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button2){

if (dot != null){
if (dot == "1"){
counter = counter + 0.02;
}else {
counter = counter / 10 + 2 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 2;
}

ans_list.setText(ans_list.getText() + "2");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button3){

if (dot != null){
if (dot == "1"){
counter = counter + 0.03;
}else {
counter = counter / 10 + 3 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 3;
}
ans_list.setText(ans_list.getText() + "3");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button4){

if (dot != null){
if (dot == "1"){
counter = counter + 0.04;
}else {
counter = counter / 10 + 4 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 4;
}
ans_list.setText(ans_list.getText() + "4");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button5){

if (dot != null){
if (dot == "1"){
counter = counter + 0.05;
}else {
counter = counter / 10 + 5 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 5;
}
ans_list.setText(ans_list.getText() + "5");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button6){

if (dot != null){
if (dot == "1"){
counter = counter + 0.06;
}else {
counter = counter / 10 + 6 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 6;
}
ans_list.setText(ans_list.getText() + "6");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button7){

if (dot != null){
if (dot == "1"){
counter = counter + 0.07;
}else {
counter = counter / 10 + 7 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 7;
}
ans_list.setText(ans_list.getText() + "7");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button8){

if (dot != null){
if (dot == "1"){
counter = counter + 0.08;
}else {
counter = counter / 10 + 8 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 8;
}
ans_list.setText(ans_list.getText() + "8");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button9){

if (dot != null){
if (dot == "1"){
counter = counter + 0.09;
}else {
counter = counter / 10 + 9 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 9;
}
ans_list.setText(ans_list.getText() + "9");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button0){

if (dot != null){
if (dot == "1"){
counter = counter + 0.00;
}else {
counter = counter / 10 + 0 * 0.1;
}
dot = "1";
}else{
counter = counter * 10 + 0;
}
ans_list.setText(ans_list.getText() + "0");
ans_list_s.setText("" + counter);
} else if (v.getId() == R.id.button_dot){
counter = counter * 10;
dot = "yes";
ans_list.setText(ans_list.getText() + ".");

} else if (v.getId() == R.id.button_ac){
counter = 0;
ans_list.setText(String.valueOf(""));
ans_list_s.setText(String.valueOf(""));
dot = null;
}


if (v.getId() == R.id.button_Tax){
ans_list.setText(nf.format(counter * 1.05));//含稅
previous = 0;
}

if (v.getId() == R.id.button_noTax){
ans_list.setText(nf.format(counter * 1.05 / 1.05));//未稅
previous = 0;
}



//符號
if (v.getId() == R.id.button_add){
previous = counter;
counter = 0;
dot = null;
Operation = bt_add.getText().toString();
ans_list.setText(String.valueOf(Operation));
}

else if (v.getId() == R.id.button_less){
previous = counter;
counter = 0;
dot = null;
Operation = bt_less.getText().toString();
ans_list.setText(String.valueOf(Operation));
}

else if (v.getId() == R.id.button_Multiply){
previous = counter;
counter = 0;
dot = null;
Operation = bt_Multiply.getText().toString();
ans_list.setText(String.valueOf(Operation));
}

else if (v.getId() == R.id.button_except){
previous = counter;
counter = 0;
dot = null;
Operation = bt_except.getText().toString();
ans_list.setText(String.valueOf(Operation));
}



//運算
if (v.getId() == R.id.button_answer){

if (Operation.equals("+")) {
counter = previous + counter;
counter_ = counter - previous;
ans_list.setText(String.valueOf(counter));
ans_list_s.setText("運算子 = " + previous + " + " + counter_);
previous = 0;
Operation = "";
} else if (Operation.equals("-")) {
counter = previous - counter;
counter_ = previous - counter;
ans_list.setText(String.valueOf(counter));
ans_list_s.setText("運算子 = " + previous + " - " + counter_);
previous = 0;
Operation = "";
} else if (Operation.equals("×")) {
counter = previous * counter;
counter_ = counter / previous;
ans_list.setText(String.valueOf(counter));
ans_list_s.setText("運算子 = " + previous + " × " + counter_);
previous = 0;
Operation = "";
} else if (Operation.equals("÷")) {
if (counter == 0) {
ans_list.setText("被除數除數不能為0");
previous = 0;
} else {
counter = previous / counter;
counter_ = previous / counter;
ans_list.setText(nf.format(counter));
ans_list_s.setText("運算子 = " + previous + " ÷ " + counter_);
previous = 0;
}
Operation = "";
}


}


}

@Override
public boolean onLongClick(View v) {
return false;
}
}

說了是不聰明的方式,主要是在顯示小數點的部分。

其實想做到的是可以自動判別小數點後面有幾個數字。

但目前仍想不出用甚麼方式,索性就用了不聰明的方式做判斷。

而且這個判斷目前也只能讓輸入小數點後2位數字,多了就會出問題了(╯з╰)

總之,研究中。

台北市內湖區江南街71巷75弄 Go

https://innstory.com/story-Android_Studio_23_陽春型計算機進階版-1193
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About the Author

Chung

我是chung
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#有人用筆寫日記,有人用歲月寫日記,有人用照片寫日記,而我,用innstory寫日記。

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