So here is my problem, I have two context menus bound to two buttons, they take the options from db tables.
final Button bButton = (Button) findViewById(R.id.BeerButton);
bButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
registerForContextMenu(bButton);
openContextMenu(bButton);
}
});
final Button fButton = (Button) findViewById(R.id.FireButton);
fButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
registerForContextMenu(fButton);
openContextMenu(fButton);
}
});
}
#Override
public void onCreateContextMenu(ContextMenu cmenu, View v,ContextMenu.ContextMenuInfo cmenuInfo)
{
super.onCreateContextMenu(cmenu, v, cmenuInfo);
if(v.getId() == R.id.BeerButton){
ContextMenu bMenu = cmenu;
bMenu.setHeaderIcon(R.drawable.beer);
bMenu.setHeaderTitle("What's your poison?");
List<bDB> bMenuContainer = bDao.queryBuilder().list();
for (bDB item : bMenuContainer) {
bMenu.add(item.getName() + " " + item.getVolume() + "l " + "(" + item.getCost() + " Kč)");
}
}
else if(v.getId() == R.id.FireButton){
ContextMenu fMenu = cmenu;
fMenu.setHeaderIcon(R.drawable.fire);
fMenu.setHeaderTitle("What do you smoke?");
//blah blah pretty much the same thing
}
}
and now to the onContextItemSelected, could you guide me how to do this part? I just need a kick-off, the rest I will handle, the data will be then written to other table for further statistics.
#Override
public boolean onContextItemSelected(MenuItem item)
{
//somebody cast your magic here, PLEASE!
}
return super.onContextItemSelected(item);
}
thanks in advance!
Related
package com.deitel.calculator;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
double input1 = 0, input2 = 0d ,count=0;
Button btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn_dot, btn_equal, btn_subtract, btn_multi, btn_add, btn_devision, btn_clear, btn_back;
TextView text_result;
boolean Addition, Subtraction, Multiplication, Devision, decimal;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn0 = findViewById(R.id.btn0);
btn1 = findViewById(R.id.btn1);
btn2 = findViewById(R.id.btn2);
btn3 = findViewById(R.id.btn3);
btn4 = findViewById(R.id.btn4);
btn5 = findViewById(R.id.btn5);
btn6 = findViewById(R.id.btn6);
btn7 = findViewById(R.id.btn7);
btn8 = findViewById(R.id.btn8);
btn9 = findViewById(R.id.btn9);
btn_dot = findViewById(R.id.btn_dot);
btn_equal = findViewById(R.id.btn_equal);
btn_add = findViewById(R.id.btn_add);
btn_subtract = findViewById(R.id.btn_subtract);
btn_multi = findViewById(R.id.btn_multi);
btn_devision = findViewById(R.id.btn_devision);
btn_clear = findViewById(R.id.btn_clear);
btn_back = findViewById(R.id.btn_back);
text_result = findViewById(R.id.text_result);
btn0.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "0");
}
});
btn1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "1");
}
});
btn2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "2");
}
});
btn3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "3");
}
});
btn4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "4");
}
});
btn5.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "5");
}
});
btn6.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "6");
}
});
btn7.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "7");
}
});
btn8.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "8");
}
});
btn9.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText(text_result.getText() + "9");
}
});
btn_add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (text_result.getText().length() != 0) {
input1 = Float.parseFloat(text_result.getText() + "");
Addition = true;
decimal = false;
text_result.setText(null);
}
}
});
btn_subtract.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (text_result.getText().length() != 0) {
input1 = Float.parseFloat(text_result.getText() + "");
Subtraction = true;
decimal = false;
text_result.setText(null);
}
}
});
btn_multi.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (text_result.getText().length() != 0) {
input1 = Float.parseFloat(text_result.getText() + "");
Multiplication = true;
decimal = false;
text_result.setText(null);
}
}
});
btn_devision.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (text_result.getText().length() != 0) {
input1 = Float.parseFloat(text_result.getText() + "");
Devision = true;
decimal = false;
text_result.setText(null);
}
}
});
btn_clear.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
text_result.setText("");
input1 = 0.0;
input1 = 0.0;
}
});
btn_dot.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(count==0){
count=1;
text_result.setText(text_result.getText()+".");
return;
}
else{
text_result.setText(text_result.getText()+"0.");
decimal=true;
}
}
});
btn_back.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String number = text_result.getText().toString();
int input = number.length();
if (input > 0) {
text_result.setText(number.substring(0, input - 1));
}
}
});
btn_equal.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
count=0;
if ((Addition || Subtraction || Multiplication || Devision) ) {
if (text_result.getText().toString().trim().equals("")){
input2=0;
return;
}else {
input2 = Float.parseFloat(text_result.getText() + "");
}
}
if (Addition) {
text_result.setText(input1 + input2 + "");
Addition = false;
}
if (Subtraction) {
text_result.setText(input1 - input2 + "");
Subtraction = false;
}
if (Multiplication) {
text_result.setText(input1 * input2 + "");
Multiplication = false;
}
if (Devision) {
text_result.setText(input1 / input2 + "");
Devision = false;
}
}
});
}
}
When I press dot button I want that dot button press only one time in input 1 like:2.5+3.7 etc.
But this code doesn't meet that requirements - it displays 2.3.4.5 etc..but I want only one dot in one input. When I press dot button I want that dot button press only one time in input 1 like:2.5+3.7 etc.
Here you can manage that with simple flag.
public class MainActivity extends AppCompatActivity {
// IDs of all the numeric buttons
private int[] numericButtons = {R.id.btnZero, R.id.btnOne, R.id.btnTwo, R.id.btnThree, R.id.btnFour, R.id.btnFive, R.id.btnSix, R.id.btnSeven, R.id.btnEight, R.id.btnNine};
// IDs of all the operator buttons
private int[] operatorButtons = {R.id.btnAdd, R.id.btnSubtract, R.id.btnMultiply, R.id.btnDivide};
// TextView used to display the output
private TextView txtScreen;
// Represent whether the lastly pressed key is numeric or not
private boolean lastNumeric;
// Represent that current state is in error or not
private boolean stateError;
// If true, do not allow to add another DOT
private boolean lastDot;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Find the TextView
this.txtScreen = (TextView) findViewById(R.id.txtScreen);
// Find and set OnClickListener to numeric buttons
setNumericOnClickListener();
// Find and set OnClickListener to operator buttons, equal button and decimal point button
setOperatorOnClickListener();
}
/**
* Find and set OnClickListener to numeric buttons.
*/
private void setNumericOnClickListener() {
// Create a common OnClickListener
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
// Just append/set the text of clicked button
Button button = (Button) v;
if (stateError) {
// If current state is Error, replace the error message
txtScreen.setText(button.getText());
stateError = false;
} else {
// If not, already there is a valid expression so append to it
txtScreen.append(button.getText());
}
// Set the flag
lastNumeric = true;
}
};
// Assign the listener to all the numeric buttons
for (int id : numericButtons) {
findViewById(id).setOnClickListener(listener);
}
}
/**
* Find and set OnClickListener to operator buttons, equal button and decimal point button.
*/
private void setOperatorOnClickListener() {
// Create a common OnClickListener for operators
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
// If the current state is Error do not append the operator
// If the last input is number only, append the operator
if (lastNumeric && !stateError) {
Button button = (Button) v;
txtScreen.append(button.getText());
lastNumeric = false;
lastDot = false; // Reset the DOT flag
}
}
};
// Assign the listener to all the operator buttons
for (int id : operatorButtons) {
findViewById(id).setOnClickListener(listener);
}
// Decimal point
findViewById(R.id.btnDot).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (lastNumeric && !stateError && !lastDot) {
txtScreen.append(".");
lastNumeric = false;
lastDot = true;
}
}
});
// Clear button
findViewById(R.id.btnClear).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txtScreen.setText(""); // Clear the screen
// Reset all the states and flags
lastNumeric = false;
stateError = false;
lastDot = false;
}
});
// Equal button
findViewById(R.id.btnEqual).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onEqual();
}
});
}
/**
* Logic to calculate the solution.
*/
private void onEqual() {
// If the current state is error, nothing to do.
// If the last input is a number only, solution can be found.
if (lastNumeric && !stateError) {
// Read the expression
String txt = txtScreen.getText().toString();
// Create an Expression (A class from exp4j library)
Expression expression = new ExpressionBuilder(txt).build();
try {
// Calculate the result and display
double result = expression.evaluate();
txtScreen.setText(Double.toString(result));
lastDot = true; // Result contains a dot
} catch (ArithmeticException ex) {
// Display an error message
txtScreen.setText("Error");
stateError = true;
lastNumeric = false;
}
}
}
}
I am trying to make a app that has a switch a button and a text and if you turn the switch on and press the button; the number displayed on the text will be added by 1. But if the switch is turned off the number will be subtracted by 1.
but when i run my app and press the button, the app crashes...
i do not have much experience at programming and i do not know what im doing wrong. and i have only tried this code.
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView text = (TextView)findViewById(R.id.textView);
final Button button = (Button)findViewById(R.id.button);
Switch mySwitch = (Switch)findViewById(R.id.mySwitch);
mySwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked== true){
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String text_string = text.getText().toString();
int text_int = Integer.parseInt(text_string);
text_int++;
text.setText(text_int);
}
});
}
if (isChecked == false) {
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String text_string = text.getText().toString();
int text_int = Integer.parseInt(text_string);
text_int++;
text.setText(text_int);
}
});
}
}
});
}
}
so this should behave as i described earlier but it doesn't.
Your app crashes because you are trying to set an int to a textview.setText()and when you pass an int to this method it expects it to be a resource id and which could not be found in your case that's why it will throw ResourceNotFoundException and crashes.
You should set text as following:
text.setText(String.valueOf(text_int));
You’re nesting listeners but that logic doesn’t work sequentially. You should declare your listeners separately. I suggest you create a boolean that holds the state of the switch and one button listener. Within the listener check if switch is enabled then run your calculations and do the same if the switch is disabled.
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(mySwitch.isChecked(){
String text_string = text.getText().toString();
int text_int = Integer.parseInt(text_string);
text_int++;
text.setText(String.valueOf(text_int));
} else {
String text_string = text.getText().toString();
int text_int = Integer.parseInt(text_string);
text_int++;
text.setText(String.valueOf(text_int));
}
}
});
You don't need a listener for the Switch, but only 1 listener for the Button:
final TextView text = (TextView)findViewById(R.id.textView);
final Button button = (Button)findViewById(R.id.button);
final Switch mySwitch = (Switch)findViewById(R.id.mySwitch);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String text_string = text.getText().toString();
int text_int = 0;
try {
text_int = Integer.parseInt(text_string);
} catch (NumberFormatException e) {
e.printStackTrace();
}
if (mySwitch.isChecked())
text_int++;
else
text_int--;
text.setText("" + text_int);
}
});
Every time you click the Button, in its listener the value in the TextView is increased or decreased depending on whether the Switch is checked or not.
I making a simple app in android studio. I have used a Single textview to take in both numbers. I also have buttons made, for the 10 digits, 4 operations and decimal point, and equals.
My app does not read the second number. When I press '=' button, it just displays the first number.
For example, when I put in a number 25, and I press the '+' button, the number gets stored in a float variable res, and the textview is cleared. Now if I put in a second number 11 and I press '=', the output is 25.0
Below, is my code for when I press the + button.
sum.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(result.getText()==null)
{
result.setText("");
}
else
{
num1 = Float.parseFloat(result.getText().toString());
res=res+num1;
result.setText(null);
num1=0;
}
}
});
and below is my code when I press =
equal.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(Float.toString(res));
res=0;
}
});
num1 and res, both are float, both initialized to 0.
Edit:- adding the full java code.
public class Calculator extends AppCompatActivity {
TextView result;
Button one,two,three,four,five,six,seven,eight,nine,zero,sum,sub,mul,div,decimal,equal;
float num1,num2,res=0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
result = findViewById(R.id.result);
one = findViewById(R.id.button_one);
two = findViewById(R.id.button_two);
three = findViewById(R.id.button_three);
four = findViewById(R.id.button_four);
five = findViewById(R.id.button_five);
six = findViewById(R.id.button_six);
seven = findViewById(R.id.button_seven);
eight = findViewById(R.id.button_eight);
nine = findViewById(R.id.button_nine);
zero = findViewById(R.id.button_zero);
sum = findViewById(R.id.button_add);
sub = findViewById(R.id.button_sub);
mul = findViewById(R.id.button_mul);
div = findViewById(R.id.button_div);
decimal = findViewById(R.id.button_decimal);
equal = findViewById(R.id.button_equal);
one.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "1");
}
});
two.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "2");
}
});
three.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "3");
}
});
four.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "4");
}
});
five.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "5");
}
});
six.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "6");
}
});
seven.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "7");
}
});
eight.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "8");
}
});
nine.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "9");
}
});
zero.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + "0");
}
});
decimal.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(result.getText() + ".");
}
});
sum.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(result.getText()==null)
{
result.setText("");
}
else
{
num1 = Float.parseFloat(result.getText().toString());
res=res+num1;
result.setText(null);
num1=0;
}
}
});
sub.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(result.getText()==null)
{
result.setText("");
}
else
{
num1 = Float.parseFloat(result.getText() + "");
res=res-num1;
result.setText(null);
}
}
});
mul.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(result.getText()==null)
{
result.setText("");
}
else
{
num1 = Float.parseFloat(result.getText() + "");
res=res/num1;
result.setText(null);
}
}
});
div.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(result.getText()==null)
{
result.setText("");
}
else
{
num1 = Float.parseFloat(result.getText() + "");
res=res/num1;
result.setText(null);
}
}
});
equal.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
result.setText(Float.toString(res));
res=0;
}
});
}
}
Your should also take the second value from the user and make the calculations in every operator function respectively.
There is logical error in your all the operators functions.
Your should add this line in all the operator whenever the specific function in called.
result.setText(num1 - num2 + "");
result.setText(num1 + num2 + "");
and so on!!!
Your are using a wrong technique by making anonymous function for the operation. Please you switch statement of nested if-else.
You are not reading in the value for the second number (right of the operator). Your OnClickListener for the = button does nothing but display res. It doesn't apply the right hand of the operator i.e. the second number
E.g. 1 + 2 = 3
Step 1 press 1
Step 2 press +, the program will get the left of the operator and load it to num1 and add it to res.
Step 3 press 2
Step 4 press =, the program will display res
If you want to see what your program is doing in real time then try using the "Debug" tool where you will be able to step through the program line by line and see what variables are being set to what extra.
use switch case for operators,
let say following are fields;
public static final int plus = 1
public static final int minus= 2
public static final int divide= 3
public static final int multiply= 4
and a variable that hold the current operation,
int currentOperation;
and when some operator button clicked then assign "currentOperation" to that operation
in listener
sum.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(result.getText()==null)
{
result.setText("");
}
else
{
num1 = Float.parseFloat(result.getText().toString());
res=res+num1;
result.setText(null);
num1=0;
currentOperation = plus //plus is public static final int plus = 1
}
}
});
and update '=' lisetener with switch statement,
equal.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
num1 = Float.parseFloat(result.getText().toString());
switch(currentOperation){
case plus:
res=res+num1;
break;
case minus:
res=res-num1;
break;
case divide:
res=res/num1;
break;
case multiply:
res=res*num1;
break;
}
result.setText(""+ res);
num1=0;
}
});
I created a calculator but I cannot display the numbers onto the TextView like every iphone/android calculator.
For example, if the user clicks 5 + 5. I want 5 + 5 to display on the textview and once you hit equals it displays 10. I've tried different ways to figure this out but I keep getting errors.
ClearBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
TextView output = (TextView) findViewById(R.id.text_view);
output.setText("");
}
});
Button0.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "0");
}
});
Button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "1");
}
});
Button2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "2");
}
});
Button3.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "3");
}
});
Button4.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "4");
}
});
Button5.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "5");
}
});
Button6.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "6");
}
});
Button7.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "7");
}
});
Button8.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "8");
}
});
Button9.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
textView.setText(textView.getText() + "9");
}
});
// Operation Buttons
addBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(textView == null) {
textView.setText(" ");
} else {
firstValue = Double.parseDouble(textView.getText() + " ");
addition = true;
textView.setText(null);
}
}
});
subBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
firstValue = Double.parseDouble(textView.getText() + " ");
subtract = true;
textView.setText(null);
}
});
divideBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
firstValue = Double.parseDouble(textView.getText() + " ");
divison = true;
textView.setText(null);
}
});
multiBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
firstValue = Double.parseDouble(textView.getText() + " ");
multiplication = true;
textView.setText(null);
}
});
equalBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
secondValue = Double.parseDouble(textView.getText() + " ");
if(addition == true) {
textView.setText(firstValue + secondValue + " ");
addition = false;
}
if(subtract == true) {
textView.setText(firstValue - secondValue + " ");
subtract = false;
}
if(divison == true) {
textView.setText(firstValue / secondValue + " ");
divison = false;
}
if(multiplication == true) {
textView.setText(firstValue * secondValue + " ");
multiplication = false;
}
}
});
NumberFormatException is an Exception that might be thrown when you
try to convert a String into a number, where that number might be an
int , a float , or any other Java numeric type.
You can use NumberFormat and Double .
Double result = new Double(textView.getText().toString());
NumberFormat nm = NumberFormat.getNumberInstance();
textview.setText(nm.format(result)+ "3");
Hope this helps you .
Can you please try and check whether it works
firstValue = Double.parseDouble(textView.getText().toString().replaceAll(" ",""));
Just a reference since you created multiple onClick listeners which is highly repetitive in your code. I'd recommend taking a look at at Android: Use a SWITCH statement with setOnClickListener/onClick for more than 1 button? This would allow you to set a switch case for multiple buttons without making multiple onClickListeners. Good luck with your calculator!
I'm trying to create a set of buttons that will change a value up or down by 1 with a single tap, and change the value quickly by holding the button. I can't figure out how to get the value to change quickly. Here's what I have:
btPlus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mTempo=mTempo+1;
setTempo(mTempo + 1);
tvTempo.setText(Integer.toString(mTempo));
}
});
btPlus.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public void onLongClick(View view) {
mTempo = mTempo + 1;
setTempo(mTempo + 1);
tvTempo.setText(Integer.toString(mTempo));
}
});
btMinus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mTempo=mTempo-1;
setTempo(mTempo - 1);
tvTempo.setText(Integer.toString(mTempo));
}
});
btMinus.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public void onLongClick(View view) {
mTempo = mTempo - 1;
setTempo(mTempo - 1);
tvTempo.setText(Integer.toString(mTempo));
}
});
return rootView;
}
Thanks for your help.
Holding the button is something else than long clicking it. You need an onTouchListener
In the onPressed method check if the MotionEvent is UP or DOWN and then start/stop counting.
EDIT: Try Counting up in a Thread, something like that:
Final Thread t = new Thread(new Runnable(){
#Override public void run(){
while(!t.isInterrupted(){
setTempo(mTempo++);
}
}
switch (event){
case ACTION_DOWN:
t.start();
break;
case ACTION_UP:
t.interrupt();
break
}