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Android Studio 2.3 陽春型計算機進階版

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ChungChung
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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，我將數字的宣告由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。

我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我輸入小數點後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
網路工作者
主業是網站系統開發建置
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聯絡/chung.teme@gmail.com

#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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