Working With Buttons In Android

Alright, so i've been making great progress on the app i'm trying to create, but most of the tutorials that i've been learning from only showcase the wondrous feature of having onl

Solution 1:

The typical convention is to just switch off of the ID of the View that is clicked. For example:

View.OnClickListenerlistener=newView.OnClickListener() {
    @OverridepublicvoidonClick(View v) {
        switch(v.getId()) {
            case R.id.SetWordsBtn:
                startWords();
                break;
            case R.id.DelWordsBtn:
                deleteWords();
                break;
        }
    }
};

int[] ids = { R.id.SetWordsBtn, R.id.DelWordsBtn };

for(int i : ids) ((Button)findViewById(i)).setOnClickListener(listener);

Solution 2:

You can alternatively set up anonymous inner class(es) that listen, instead of having your Activity itself be the listener that implements OnClickListener. Example from the Android Button javadoc:

     button.setOnClickListener(newView.OnClickListener() {
         publicvoidonClick(View v) {
             // Perform action on click
         }
     });

http://developer.android.com/reference/android/widget/Button.html

P.S. start your local variable names, and method names, with lower case letters -- upper case is for class names.

Solution 3:

Where you suggested:

public void onClick(View setWordsView) {

  startWords();
}

public void onClick(View delWordsView) {

  deleteWords();
}

If you think about it, there is no difference in the two method declarations and you would get a build error (method signatures are the same, even though the method parameter, View, has a different name).

If I understand your question correctly then the answer given by kcoppock is correct. You also could define an Anonymous Class

Solution 4:

Drag and drop button on graghiclayout.xml ...>right click the button -->choose other properties....>choose inherited from view ---->click on click ....name it callme.

That will be shows like this:

xml file

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_x="76dp"
    android:layout_y="58dp"
    android:onClick="callme"
    android:text="Button" />

Run once your project:

Open src --->activity .java ----->, do the coding like this:

@OverridepublicvoidonCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    setContentView(R.layout.main);

   but=(Button)findViewById(R.id.button1);
}

publicvoidcallme(View v)
{
//Do somthing
}