Develop Reference

How can I use a double between two classes?

I want to build a currency calculator.
There is a plain text and a button.
if somebody scribe a number in the plain text and press the button a dialog will be shown.
BUT the number of the plaintext is everytime 2.1311!
here is my code
//this is the Main Activity
public class MainActivity extends AppCompatActivity {
public void PesoInEuro (View view){
EditText Peso = findViewById(R.id.EuroBetrag);
String amountPeso = Peso.getText().toString();
double amountPesodouble = Double.parseDouble(amountPeso);
double amountEurodouble = amountPesodouble * 46.85;
String amountEuro = String.valueOf(amountEurodouble);
Button buttonOne = (Button) findViewById(R.id.PesoEuro);
buttonOne.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openDialog();
}
});
}
public void openDialog(){
DiaPesoEuro exampleDialog = new DiaPesoEuro();
exampleDialog.show(getSupportFragmentManager(), "example Dialog");
}

First of all, it's a good practice to find your views in the OnCreate method.
Secondly, you have read and calculate your values when the user hit the button.
In the code above, you got the data in the PesoInEuro, and when the user presses the button, it shows the retrieved data and your calculation is based on them.

I Would Like To Have A Single Button Display A Different Line Of Text Each Consecutive Time It's Pressed in Android Studio

I'm extremely new to coding, so apologies if this question is trivial or the answer is easily found somewhere. I have searched, but I cannot find anything that helps.
Basically, I'm trying to code a simple, 2 button app in Android Studio.
Button1 is meant to simply display a series of commands to the user via text box.
Button2 merely resets.
My problem is, I would like Button1 to change what's displayed in the text view each time it is pressed, but I cannot figure out how to do so. I don't want to make 6 or 7 buttons.
Basically I would like it to run as follows;
Text = "Pick a number"
user presses Button1
Text = "Add 15" (This is as far as I've gotten)
user presses Button1
Text = "Multiply times 5"
user presses Button1 etc. etc. etc.
If anybody could please explain or usher me in the right direction, I would be greatly appreciative.

You can use button.setOnClickListener
public class MyActivity extends Activity {
EditText et;
Button button;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_layout_id);
et = (EditText)findViewById(R.id.edittext);
button = (Button)findViewById(R.id.button_id);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//Perform your Logic here.
et.setText("New text");
}
});
}
}

you can use a globle and a swithchcase
public class MyActivity extends Activity {
EditText et;
int CLICKS=0;
Button button;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_layout_id);
et = (EditText)findViewById(R.id.edittext);
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CLICKS++;
switch(clicks)
{
case 1:
et.setText("Pick a number");
break;
case 2:
et.setText("Add 15");
break;
case 3:
et.setText("Multiply times 5");
break;
}
}
});
}
}

Android button with multiple click simple

i am new in android programming, and i am working on my first application, so i just want to know how every time when i click same button it does some action, for example if i have a button called ( next ) and i want to click on it and an image will appear, this one i did it, but i want to click on the same button and show another image view in the same activity.
i have tried some code but with no results
so please if anyone can post a code that explain how i can do it.

Here is a quick example of code...
Rather than show a random image, it will show a random String. All you need to do is just modify it to show images instead.
public class MainActivity extends Activity {
private String[] names = {"Joe", "Mark", "Amanda", "Kelly", "Michael", "Jenny"};
private Button button;
private TextView name;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get our views
name = (TextView) findViewById(R.id.name);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
next(); // show random name
}
});
}
// Display random name on button click
private void next() {
name.setText(names[rand()]);
}
// Pick a random number from 0 to names.length
private int rand() {
return new Random().nextInt(names.length);
}
}

Android Notification Area Customization

I don't know whether this question get minus points, but I searched every where and my last resort is stackoverflow.
I need to add five buttons to notification area in horizontally. And each button I need to add even listener. I know it is possible to do with RemoteViews. But I never seen anyone adding event listener to each element.
These are the references if anyone need to refer.
Notifications Documentation
How to create a custom notification on android
SlidingDrawer API

You can add 5 anonymous listeners, or a single named listener.
Anonymous:
Button b1 = new Button(...);
b1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// first listener's code goes here
}
});
Button b2 = new Button(...);
b2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// second listener's code goes here
}
});
...
named is much the same, but contains a switch statement to differentiate what happens:
View.OnClickListener myListener = new View.OnClickListener() {
public void onClick(View v) {
String buttonTitle = ((Button)v).getText();
if ("title1".equals(buttonTitle)) {
// do things for the first button's click
} else if ("title2".equals(buttonTitle)) {
// do things for the second button's click
}
...
}
});
...

how to calculate the number of touches on a button in android

hi i am a new developer. i am trying to design an app. In my app i want to calculate the no of touches in a particular button. Is this can be calculated by onTouch process if yes can anyone give me an example or idea.

Try below code
First Create an Global variable
int numberOfClick = 0;
Now for your button try following code
clickButton.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
numberOfClick++;
}
}
now you can get the number of clicks by this variable

A click on a button is sent to the app via the onClick event. So if you have a Button:
Button myButton = (Button) findViewById(R.id.myButton);
myButton.setOnClickListener(myClickListener);
You can set up your onClickListener to do whatever you want when the button is clicked.
// Create an anonymous implementation of OnClickListener
private OnClickListener myClickListener = new OnClickListener() {
public void onClick(View v) {
// increment the counter on click
numberOfClicks++;
}
};