UselessNoob
Reputation: 113
Simple Android Calculator
I am trying to build a simple calculator. Following is the activity file:
package com.example.calcsimple;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class MainActivity extends Activity {
Button btnClr , btn0 , btn1 , btn2 , btn3 , btn4, btn5 , btn6 , btn7 , btn8 , btn9 , btnAdd , btnSub , btnMul , btnDiv , btnEq;
TextView textView1 ;
double i1 , i2 , result=0;
boolean newValue = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView1 = (TextView) findViewById(R.id.textView1);
btnClr = (Button) findViewById(R.id.btnClr);
btn0 = (Button) findViewById(R.id.btn0);
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn3 = (Button) findViewById(R.id.btn3);
btn4 = (Button) findViewById(R.id.btn4);
btn5 = (Button) findViewById(R.id.btn5);
btn6 = (Button) findViewById(R.id.btn6);
btn7 = (Button) findViewById(R.id.btn7);
btn8 = (Button) findViewById(R.id.btn8);
btn9 = (Button) findViewById(R.id.btn9);
btnAdd = (Button) findViewById(R.id.btnAdd);
btnSub = (Button) findViewById(R.id.btnSub);
btnMul = (Button) findViewById(R.id.btnMul);
btnDiv = (Button) findViewById(R.id.btnDiv);
btnEq = (Button) findViewById(R.id.btnEq);
btn0.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
textView1.append("0");
}
});
btn1.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("1");
else
textView1.setText(textView1.getText().toString() + "1");
newValue = false;
}
});
btn2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("2");
else
textView1.setText(textView1.getText().toString() + "2");
newValue = false;
}
});
btn3.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("3");
else
textView1.setText(textView1.getText().toString() + "3");
newValue = false;
}
});
btn4.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("4");
else
textView1.setText(textView1.getText().toString() + "4");
newValue = false;
}
});
btn5.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("5");
else
textView1.setText(textView1.getText().toString() + "5");
newValue = false;
}
});
btn6.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("6");
else
textView1.setText(textView1.getText().toString() + "6");
newValue = false;
}
});
btn7.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("7");
else
textView1.setText(textView1.getText().toString() + "7");
newValue = false;
}
});
btn8.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("8");
else
textView1.setText(textView1.getText().toString() + "8");
newValue = false;
}
});
btn9.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(newValue == true)
textView1.setText("9");
else
textView1.setText(textView1.getText().toString() + "9");
newValue = false;
}
});
btnAdd.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
i1 = Double.parseDouble(textView1.getText().toString());
textView1.setText("");
result = result + i1;
textView1.setText(Double.toString(result));
newValue=true ;
}
});
btnSub.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
i1 = Double.parseDouble(textView1.getText().toString());
result = result - i1;
textView1.setText(Double.toString(result));
newValue=true ;
textView1.setText("");
}
});
btnMul.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
i1 = Double.parseDouble(textView1.getText().toString());
result = result * i1;
textView1.setText(Double.toString(result));
newValue=true ;
textView1.setText("");
}
});
btnDiv.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
i1 = Double.parseDouble(textView1.getText().toString());
result = result / i1;
textView1.setText(Double.toString(result));
newValue=true ;
textView1.setText("");
}
});
btnEq.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
textView1.setText(Double.toString(result));
}
});
btnClr.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
textView1.setText("");
newValue=true;
result = 0 ;
i1=0;
}
});
}
}
Following is the XML layout file:
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/btn1"
android:layout_width="44dp"
android:layout_height="wrap_content"
android:layout_x="6dp"
android:layout_y="109dp"
android:text="1" />
<Button
android:id="@+id/btn2"
android:layout_width="48dp"
android:layout_height="wrap_content"
android:layout_x="88dp"
android:layout_y="108dp"
android:text="2" />
<Button
android:id="@+id/btn3"
android:layout_width="44dp"
android:layout_height="wrap_content"
android:layout_x="174dp"
android:layout_y="106dp"
android:text="3" />
<Button
android:id="@+id/btn4"
android:layout_width="45dp"
android:layout_height="wrap_content"
android:layout_x="6dp"
android:layout_y="184dp"
android:text="4" />
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_x="0dp"
android:layout_y="4dp"
android:text="" />
<Button
android:id="@+id/btn5"
android:layout_width="45dp"
android:layout_height="wrap_content"
android:layout_x="92dp"
android:layout_y="186dp"
android:text="5" />
<Button
android:id="@+id/btn6"
android:layout_width="45dp"
android:layout_height="wrap_content"
android:layout_x="175dp"
android:layout_y="180dp"
android:text="6" />
<Button
android:id="@+id/btn7"
android:layout_width="44dp"
android:layout_height="wrap_content"
android:layout_x="9dp"
android:layout_y="261dp"
android:text="7" />
<Button
android:id="@+id/btn8"
android:layout_width="44dp"
android:layout_height="wrap_content"
android:layout_x="94dp"
android:layout_y="264dp"
android:text="8" />
<Button
android:id="@+id/btn9"
android:layout_width="46dp"
android:layout_height="wrap_content"
android:layout_x="176dp"
android:layout_y="263dp"
android:text="9" />
<Button
android:id="@+id/btn0"
android:layout_width="45dp"
android:layout_height="wrap_content"
android:layout_x="96dp"
android:layout_y="348dp"
android:text="0" />
<Button
android:id="@+id/btnAdd"
android:layout_width="45dp"
android:layout_height="wrap_content"
android:layout_x="248dp"
android:layout_y="105dp"
android:text="+" />
<Button
android:id="@+id/btnSub"
android:layout_width="43dp"
android:layout_height="wrap_content"
android:layout_x="249dp"
android:layout_y="181dp"
android:text="-" />
<Button
android:id="@+id/btnMul"
android:layout_width="43dp"
android:layout_height="wrap_content"
android:layout_x="248dp"
android:layout_y="267dp"
android:text="X" />
<Button
android:id="@+id/btnDiv"
android:layout_width="44dp"
android:layout_height="wrap_content"
android:layout_x="248dp"
android:layout_y="347dp"
android:text="/" />
<Button
android:id="@+id/btnEq"
android:layout_width="44dp"
android:layout_height="wrap_content"
android:layout_x="176dp"
android:layout_y="347dp"
android:text="=" />
<Button
android:id="@+id/btnClr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="12dp"
android:layout_y="346dp"
android:text="Clear" />
</AbsoluteLayout>
Now the problem is that I'm not finding any way to receive and store the second operand from the user.
Upvotes: 3
Views: 18451
Answers (2)
tamil
Reputation: 41
'you can try this code..'
package com.example.showoff;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.text.method.DigitsKeyListener;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView edittest1;
Button one, two, three, four, five, six, seven, eight, nine, zero, add, sub, mul, div, cancel, equal;
ArrayList<Float> math = new ArrayList<Float>();
float m1;
float m2;
float temp;
int currentOperation = 0;
int nextOperation;
final static int ADD = 1;
final static int SUBTRACT = 2;
final static int MULTIPLY =3;
final static int DIVISION = 4;
final static int EQUALS = 0;
final static int CLEAR = 1;
final static int DONT_CLEAR = 0;
int clearDisplay = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edittest1 = (TextView) findViewById(R.id.edittest1);
one =(Button) findViewById(R.id.btnNum1Id);
two =(Button) findViewById(R.id.btnNum2Id);
three =(Button) findViewById(R.id.btnNum3Id);
four =(Button) findViewById(R.id.btnNum4Id);
five =(Button) findViewById(R.id.btnNum5Id);
six =(Button) findViewById(R.id.btnNum6Id);
seven =(Button) findViewById(R.id.btnNum7Id);
eight =(Button) findViewById(R.id.btnNum8Id);
nine =(Button) findViewById(R.id.btnNum9Id);
zero =(Button) findViewById(R.id.btnNum0Id);
add =(Button) findViewById(R.id.btnNumAddId);
sub =(Button) findViewById(R.id.btnNumSubId);
mul =(Button) findViewById(R.id.btnNumMulId);
div =(Button) findViewById(R.id.btnNumDivId);
cancel =(Button) findViewById(R.id.btnNumClearId);
equal =(Button) findViewById(R.id.btnNumEqualId);
edittest1.setKeyListener(DigitsKeyListener.getInstance(true,true));
registerListeners();
}
private void registerListeners() {
// TODO Auto-generated method stub
one.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("1");
}
});
two.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("2");
}
});
three.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("3");
}
});
four.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("4");
}
});
five.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("5");
}
});
six.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("6");
}
});
seven.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("7");
}
});
eight.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("8");
}
});
nine.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("9");
}
});
zero.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (clearDisplay == CLEAR) {
edittest1.setText("");
}
clearDisplay = DONT_CLEAR;
edittest1.append("0");
}
});
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calcLogic(ADD);
}
}
);
sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calcLogic(SUBTRACT);
}
});
mul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calcLogic(MULTIPLY);
}
});
div.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calcLogic(DIVISION);
}
});
equal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calcLogic(EQUALS);
}
});
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
edittest1.setText("0");
m1 = 0;
m2 = 0;
math.removeAll(math);
currentOperation = 0;
nextOperation = 0;
}
});
}
private void calcLogic(int operator){
math.add(Float.parseFloat(edittest1.getText().toString()));
if (operator != EQUALS) {
nextOperation = operator;
}
else if (operator == EQUALS){
nextOperation = 0;
//operator=' ';
}
switch (currentOperation) {
case ADD:
m1 = math.get(0);
m2 = math.get(1);
math.removeAll(math);
math.add(m1 + m2);
edittest1.setText(String.format("%.3f", math.get(0)));
break;
case SUBTRACT:
m1 = math.get(0);
m2 = math.get(1);
math.removeAll(math);
math.add(m1 - m2);
edittest1.setText(String.format("%.3f", math.get(0)));
break;
case MULTIPLY:
m1 = math.get(0);
m2 = math.get(1);
math.removeAll(math);
math.add(m1 * m2);
edittest1.setText(String.format("%.3f", math.get(0)));
break;
case DIVISION:
m1 = math.get(0);
m2 = math.get(1);
math.removeAll(math);
math.add(m1 / m2);
edittest1.setText(String.format("%.3f", math.get(0)));
break;
}
clearDisplay = CLEAR;
currentOperation = nextOperation;
if (operator == EQUALS) {
m1 = 0;
m2 = 0;
math.removeAll(math);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Upvotes: 0
Kazekage Gaara
Reputation: 15052
From your code, it appears that both your operands are to be entered into the same TextView. First enter your first operand, then press any operator and then in the same TextView the second operand will go in. Moreover, each of the operands seem to be handled by individual buttons, so you just need to enter them by clicking on the buttons.
First, enter your first operand, click on an operator, then click on second operand, and then click on =. That should work fine for you.
Upvotes: 1