Android Events

1. OnClickListener:

Two Ways to use OnClickListener Event

• First Step

 It is an event in android when you click on button, editText, and more. See example below.

Step 1:
public class Your_ Activity extends Activity implements OnClickListener{
//en your activity extends OnClickListener

Step 2:
btn_search = (Button)findViewById(R.id.btn_search);
btn_search.setOnClickListener(this);
//inside onCreate Method, you can initialize the  button. I used button for this event.

Step 3:
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.btn_search:
//do everything here...

break;
}
//Use switch statement to get the ID of a button. Thats All!

• Second Step

Step 1:

btn_search = (Button)findViewById(R.id.btn_search);

//initialize it under OnCreate Method. Or you can use a function for a better programming tutorial.

Step 2:

et_datefrom.setOnClickListener(new OnClickListener() {
    //do some code here...
    });
//That's it!

 2. OnFocusChangeListener():

Step 1:

btn_search = (Button)findViewById(R.id.btn_search);

//initialize it under OnCreate Method. Or you can use a function for a better programming tutorial.

Step 2:
et_datefrom.setOnFocusChangeListener(new OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
    // TODO Auto-generated method stub
    if(hasFocus){
    //do some code here
    }
    }
    });
This even occur when you hit a button, edittext or etc. Actualy there are many ways to used that like onClickListener also.