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我是Android開發新手，目前正在學習設計基本的計算器應用程序。我已經自己設計了佈局，但是從不同網站的主要活動代碼獲得了0到9,+, -, *, /的操作，並且在合併之後，它們工作正常。Android計算器：小數點位置的按鈕
但是，我想用小數點函數進一步修改MainActivity。 使用「current = current * 10 + number」可以正確顯示整數，例如53 = 5 * 10 + 3;
我想申請小數點相同的方法用環功能，這個想法是這樣的： 1電流=電流+剩餘如果點的按鈕被按下 2.創建的整數I，I增加1一旦點擊任何數字按鈕 3.以便當例如輸入5.3，i = 1，它將= 5 + 3 /（10^i）= 5.3 4. 5.3循環到這裏，然後當例如，輸入作爲5.39，現在我= 2，它將= 5.3 + 9 /（10^I）= 5.39
問題>> * 但是...真的...我很新鮮，我做不知道如何設計小數點按鈕的編碼，會有人可以提示代碼嗎？ *第一忽略以下插件其中待檢測的錯誤（如刪除第二點，如果點是輸入兩次或更多次，在.如果說前面添加0，.5是輸入）
按鈕id是如下，並且一旦點擊以引用DecimalClickEvent Button b_decimal =（Button）findViewById（R.id.decimal）; b_decimal.setOnClickListener（new DecimalClickEvent（???））;}
很多很多很多的提前感謝！代碼附在下面供參考和您的意見：
========================= MainActivity.java ======= ==============================
package com.trial.newcalculator;
import java.io.Serializable;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
@SuppressLint("ParserError")
public class MainActivity extends Activity {
State s;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
s = new State();
int[] opNumbers = new int[] {
R.id.zero,
R.id.one,
R.id.two,
R.id.three,
R.id.four,
R.id.five,
R.id.six,
R.id.seven,
R.id.eight,
R.id.nine,
};
final TextView textView = (TextView) findViewById(R.id.ansEditText);
for (int i = 0; i < 10;i++){
final Button button = (Button) findViewById(opNumbers[i]);
button.setOnClickListener(new NumberClickEvent(textView,s,i));
}
int[] opButtons = new int[] { R.id.add, R.id.subtract, R.id.multiply, R.id.divide };
State.Operation[] states = new State.Operation[] {
State.Operation.PLUS,
State.Operation.MINUS,
State.Operation.MULTIPLY,
State.Operation.DIVIDE};
for(int i = 0; i < opButtons.length;i++){
Button b_op = (Button) findViewById(opButtons[i]);
b_op.setOnClickListener(new OperationClickEvent(textView, s, states[i]));
}
// Memory functions
int[] memButtons = new int[] { R.id.MC, R.id.MR, R.id.Mdeduct, R.id.Mplus};
State.Operation[] mstates = new State.Operation[] {
State.Operation.MEMORYCLEAR,
State.Operation.MEMORYCALL,
State.Operation.MEMORYMINUS,
State.Operation.MEMORYPLUS};
for(int i = 0; i < memButtons.length;i++){
Button b_mem = (Button) findViewById(memButtons[i]);
b_mem.setOnClickListener(new OperationClickEvent(textView, s, states[i]));
}
// Memory functions
//decimal
// Button b_decimal = (Button) findViewById(R.id.decimal);
// b_decimal.setOnClickListener(new DecimalClickEvent(textView, s, "."));
//decimal
Button b_eq = (Button) findViewById(R.id.equal);
b_eq.setOnClickListener(new EqualClickEvent(textView, s));
Button b_op = (Button) findViewById(R.id.ac);
b_op.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
s.clear();
textView.setText(s.getDisplay());
}
});
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putSerializable("STATE", s);
}
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
Serializable serializable = savedInstanceState.getSerializable("STATE");
if(serializable!= null){
s = (State) serializable;
}
}
public void onPause(){
super.onPause();
}
}
============= ================== State.java ============================= =====
package com.trial.newcalculator;
import java.io.Serializable;
import android.text.Editable;
import android.widget.TextView;
public class State implements Serializable {
private static final long serialVersionUID = -1231231231231233L;
public TextView output;
public enum Operation {
PLUS,
MINUS,
MULTIPLY,
DIVIDE,
MEMORYPLUS,
MEMORYMINUS,
MEMORYCALL,
MEMORYCLEAR,
}
public enum IOState{
INPUTTING,
DISPLAY_RESULT,
}
private Double accu = null;
private double current = 0;
private double memory = 0;
private Operation currentOp = null;
private IOState currentState = IOState.INPUTTING;
public Operation getCurrentOp() {
return currentOp;
}
public void setCurrentOp(Operation currentOp) {
if (currentState == IOState.INPUTTING){
if (accu != null && this.currentOp != null){calculateResult();
}
else{accu = Double.valueOf(current);current = 0;
}
}
this.currentOp = currentOp;
if (currentState == IOState.INPUTTING){
currentState = IOState.DISPLAY_RESULT;
}
}
private void calculateResult() {
double res = accu.doubleValue();
switch (currentOp) {
case PLUS:
res += current;
break;
case MINUS:
res -= current;
break;
case MULTIPLY:
res *= current;
break;
case DIVIDE:
res /= current;
break;
case MEMORYPLUS:
memory += current;
break;
case MEMORYMINUS:
memory -= current;
break;
case MEMORYCLEAR:
memory = 0;
break;
case MEMORYCALL:
current = memory;
break;
}
accu = Double.valueOf(res);
current = 0;
}
public void number(int number) {
if (currentState == IOState.INPUTTING){
current = current *10 + number;
}
else if(currentState == IOState.DISPLAY_RESULT){
currentState = IOState.INPUTTING;
current = number;
}
}
public String getDisplay() {
String res;
Double d = getCurrentDisplayValue();
double doubleValue = d.doubleValue();
int intVal = (int)doubleValue;
if (intVal == doubleValue){
res = Integer.toString(intVal);
}
else{
res = d.toString();
}
return res;
}
private Double getCurrentDisplayValue() {
Double d = accu;
if (currentState == IOState.INPUTTING){
d = Double.valueOf(current);
}
return d;
}
public void clear() {
accu = null;
currentState = IOState.INPUTTING;
currentOp = null;
current = 0;
}
public void equal() {
if (accu == null || currentOp == null){
return;
}
calculateResult();
currentState = IOState.DISPLAY_RESULT;
currentOp = null;
current = getCurrentDisplayValue();
}
}
==================== OperationClickEvent.java =============== ================
package com.trial.newcalculator;
import com.trial.newcalculator.State.Operation;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
final class OperationClickEvent implements OnClickListener {
private State s;
private TextView textView;
private Operation op;
public OperationClickEvent(TextView textView, State s, State.Operation op) {
super();
this.op = op;
this.s = s;
this.textView = textView;
}
public void onClick(View v) {
s.setCurrentOp(op);
textView.setText(s.getDisplay());
}
}
================= EqualClickEvent.java =========================== ============
package com.trial.newcalculator;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
final class EqualClickEvent implements OnClickListener {
private State s;
private TextView textView;
public EqualClickEvent(TextView textView, State s) {
super();
this.s = s;
this.textView = textView;
}
public void onClick(View v) {
s.equal();
textView.setText(s.getDisplay());
}
}
====================== NumberClickEvent.java ====== ============================
package com.trial.newcalculator;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
final class NumberClickEvent implements OnClickListener {
private int number;
private State s;
private TextView textView;
public NumberClickEvent(TextView textView, State s, int number) {
super();
this.number = number;
this.s = s;
this.textView = textView;
}
public void onClick(View v) {
s.number(number);
textView.setText(s.getDisplay());
}
}
是是......謝謝你的建議...很抱歉用以作爲一個初學者，它只是使事情到單獨的類來使程序更短，更容易登場......燁一些個人的親景...但真的不能解決如何設計1）小數點2）+/- 3）doublezero – pearmak 2012-08-13 12:39:29
對於雙零點，嘗試將特定值乘以100並在點擊特定雙零點時顯示它 – 2012-08-14 04:12:55
感謝您的輝煌理念！ – pearmak 2012-08-14 04:43:47