CODEWITHSUNDEEP
androiduser-interfacelayout
XurajB
XurajB

Reputation: 840

Program many buttons!

I have 25 buttons in my Layout. What is the efficient way to know which button is clicked or to get their IDs ??

Thanks in advance..

Upvotes: 0

Views: 449

Answers (5)

Selvin
Selvin

Reputation: 6797

i don't get where is problem

in layout xml add onClick="onClick" for every button then in Activity ad function

public void onClick(View v) {
  switch(v.getId()){
    case R.id.Button1:
      break;
    case R.id.Button2:
      break;
    case R.id.Button3:
      break;
//....
  }
}

EDIT (coz i can't add coment to someone else answer: @Zach Rattner

According to this http://developer.android.com/reference/android/widget/Button.html Zach you're wrong

However, instead of applying an OnClickListener to the button in your activity, you can assign a method to your button in the XML layout, using the android:onClick attribute

Upvotes: 0

darioo
darioo

Reputation: 47183

The standard way to do this is to declare every button with a unique id in XML layout file, like this:

<Button android:id="@+id/my_button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/my_button_text"/>

Note that you have to do this for every button.

Next, you can use the following piece of code as button listeners:

final Button button1 = (Button) findViewById(R.id.my_button1);
     button.setOnClickListener(new View.OnClickListener() {
          public void onClick(View v) {
               // Perform action on click
          }
     });

This will be inefficient since you'll be creating 25 new View.OnClickListener objects (one for each button), and since you're programming for Android which is a memory constrained device, it will be better to create just one listener and assign it to every button, and then check which button does View v correspond to.

I hope you're not going to put 25 buttons on one screen. If yes, you might want to rethink your design.

Upvotes: 0

Twobard
Twobard

Reputation: 2583

Something like this should work:

Button button1 = (Button)findViewById(R.id.Button01);
    Button button2 = (Button)findViewById(R.id.Button02);

    private class myListener implements OnClickListener
    {

        @Override
        public void onClick(View arg0) {

            if (arg0 == button1)
            {
                //button 1 clicked
            }
            else if (arg0 == button2)
            {
                //button 2 clicked
            }
            //etc 
        }

    }

    myListener listener = new myListener();

    button1.setOnClickListener(listener);
    button2.setOnClickListener(listener);

Upvotes: 0

Zach Rattner
Zach Rattner

Reputation: 21333

According to the Android documentation for an Activity, the only way to find a view is through findViewById. If you want to do something when a button with a specific ID is set, then you will have to add onClickListeners to each button individually.

Upvotes: 0

Squonk
Squonk

Reputation: 48871

Button implements View.OnClickListener which receives the view that has been clicked. You can get the ID as follows...

@Override
public void onClick(View view) {
    int Id = view.getId();
}

Upvotes: 1

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