Android Custom listening event with Parameters

Learn and develop at the beginning. Please correct the error

Recently, I encountered a problem where parameter passing is required for Android listening events in the project.

For example, in ListView, some variable data has a CheckBox, which should be displayed at the bottom by clicking the check box. Therefore, some parameters need to be included to control the setOnClickListener event.

The last thought is not to use the default listening class.

 

[Java] holder. cbNode. setOnClickListener (new OnClickListener ()
{

@ Override
Public void onClick (View v)
{
// TODO Auto-generated method stub

}
});

Holder. cbNode. setOnClickListener (new OnClickListener ()
{

@ Override
Public void onClick (View v)
{
// TODO Auto-generated method stub

}
});

, Write a listener class to implement the listener interface, and construct the constructor with parameters, as shown below:

[Java] class CheckBoxListener implements OnClickListener {
Private TextView _ tvPeople = null;
Private ViewHolder _ holder = null;
Public CheckBoxListener (TextView tvPeople, ViewHolder holder)
{
// TODO Auto-generated constructor stub
This. _ tvPeople = tvPeople;
This. _ holder = holder;
}
@ Override
Public void onClick (View v)
{
// TODO Auto-generated method stub
If (this. _ holder. cbNode! = Null)
{
String curSelectedPeople = this. _ tvPeople. getText (). toString ();
If (! This. _ holder. cbNode. isChecked ())
{
// Cancel the selected Reader
CurSelectedPeople = ("," + curSelectedPeople). replace ("," + this. _ holder. cbNode. getText (). toString (), ""). substring (1 );
This. _ tvPeople. setText (curSelectedPeople );
} Else
{
// Display the added Reader
If (! CurSelectedPeople. equals (""))
CurSelectedPeople + = "," + this. _ holder. cbNode. getText (). toString ();
Else
CurSelectedPeople = this. _ holder. cbNode. getText (). toString ();
_ TvPeople. setText (curSelectedPeople );
}
}
}

}

Class CheckBoxListener implements OnClickListener {
Private TextView _ tvPeople = null;
Private ViewHolder _ holder = null;
Public CheckBoxListener (TextView tvPeople, ViewHolder holder)
{
// TODO Auto-generated constructor stub
This. _ tvPeople = tvPeople;
This. _ holder = holder;
}
@ Override
Public void onClick (View v)
{
// TODO Auto-generated method stub
If (this. _ holder. cbNode! = Null)
{
String curSelectedPeople = this. _ tvPeople. getText (). toString ();
If (! This. _ holder. cbNode. isChecked ())
{
// Cancel the selected Reader
CurSelectedPeople = ("," + curSelectedPeople). replace ("," + this. _ holder. cbNode. getText (). toString (), ""). substring (1 );
This. _ tvPeople. setText (curSelectedPeople );
} Else
{
// Display the added Reader
If (! CurSelectedPeople. equals (""))
CurSelectedPeople + = "," + this. _ holder. cbNode. getText (). toString ();
Else
CurSelectedPeople = this. _ holder. cbNode. getText (). toString ();
_ TvPeople. setText (curSelectedPeople );
}
}
}

} As shown above, here I provide two parameters in the constructor, one is TextView (the control to be displayed) and the other is a parameter object class, which can be used for convenient custom operations.