Richal Richal - 2 months ago 16
Android Question

Easier way to get view's Id (string) by its Id (int)

I'm new with android and java, so sorry if it's a too basic question but I've tried to find a solution in the forums and google and I couldn't.

I have 24 buttons in my layout, all these buttons do something similar so I want to create a generic function. But first I need to know the name (xml id) of he button.

This the XML code of the button:

<Button
android:id="@+id/add_04"
android:layout_width="42dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="15dp"
android:background="@xml/zbuttonshape"
android:onClick="onClick"
android:text="@string/mas" />


I set android:onClick="onClick" for all the buttons.

In my activity I've create a new function onClick:

This the code I've tried:

public void onClick(View v) {
String name = v.getContext().getString(v.getId());
String name2 = context.getString(v.getId());
String name3 = getString(v.getId());
String name4 = getResources().getString(v.getId());
}


But when I try to get the name (in this case "add_04") I always get "false".

Finally I've found a solution with the following code:

import java.lang.reflect.Field;

String name5 = null;
Field[] campos = R.id.class.getFields();
for(Field f:campos){
try{
if(v.getId()==f.getInt(null)){
name5 = f.getName();
break;
}
}
catch(Exception e){
e.printStackTrace();
}
}


My question is if Is not there an easier way to get this ID?

Thanks in advance.

Answer

The approach is misguided to begin with. If you want to associate a piece of arbitrary data (e. g. a string) with a view, that's what tag is for. The ID is numeric and it better stay that way.