Develop Reference

GetSelectedItem on OnItemClickListener (Android)

let's say you have a listview with custom xml-objects on it in a row.
But you want to address specifically the textview, if it's press in the OnItemClickListener. What's the way - or bette - the best practise to do so? If i check in the OnItemClick method, the specifically element in the row (e.g. the textview, doesn't get recognized.

You can add onClickListener to that textView in the getView method of your adapter like this.
viewHolder.myTextView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG,"item= "+data.get(position).getTitle());
}
});

For this to work create a class which extends BaseAdapter class and implements all its method
1.Now in the getView() method of this class initialize all the required views in a single item of listview
2.After that attach onClickListener() to the desired textView.
3.After that select your custom adapter class in the listView.setAdapter() method
This should help you if it doesn't work use RecyclerView instead and do all the above task in the onCreateViewHolder() method of RecyclerView.adapter Class

if you have model class name **User** now you can get user info by using
viewHolder.tv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
User user = data.get(pos);
user.getTitle();
Log.d(TAG,"item= "+data.get(position).getTitle());
}
});

Android upper limit for no of OnclickListeners on an Activity

I am making a keyboard app. For what I need to know if I can assign seperate onclicklistener to each button, ie around 70 onclicklisteners on a single activity.
Is it a right way to do it??

Implement View.OnClickListener in your activity.Give different id for the views.
public class KeyBoardActivity extends Activity implements View.OnClickListener{
#Override
protected void onCreate(Bundle savedInstanceState) {
}
#Override
public void onClick(View v) {
//Write your code for the corresponding view ids
}
}

android wear gridviewpager onClick Listener

I'm developing a simple application in which youb have different spots placed on google map.
When I click on a spot I get its details which are displayed in a GridViewPager.
For now my application is based on the GridViewPager sample available with the sdk.
Here is my layout for the spot details (nothing fancy)
<android.support.wearable.view.GridViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true"/>
My problem now is that I'm not able to detect a Click event on a card.
I've tried this but it doesn't work.
public class DetailsActivity extends Activity implements GridViewPager.OnClickListener {
#Override
public void onClick(View v) {
}
I've also tried View.OnClickListener.
Have any idea ?

There are two issues here. First, if you really want to make the GridViewPager clickable, you need to tell it to listen for click events - just implementing the OnClickListener interface isn't sufficient. So you need to do something like this:
public class DetailsActivity ... {
#Override
public void onCreate(Bundle savedInstanceState) {
...
GridViewPager pager = (GridViewPager)findViewById(R.id.pager);
pager.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// put your onClick logic here
}
});
...
}
}
That being said, however, based on your description it sounds like what you actually want is to set up click handlers on individual pages within the grid, not on the entire grid. If so, then you'll need to do something similar but in each page's Fragment class. For example:
public class MyPageFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View result = inflater.inflate(...);
result.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// put your onClick logic here
}
});
...
return result;
}
}
Note: if you are using CardFragments in your GridViewPager, then you would probably set the OnClickListener in your onCreateContentView override. Otherwise, the above Fragment-based example should apply.

What do I use as a parameter for the setOnClickListener() method?

I'm trying to make multiple OnClickListener methods for 5 buttons in my program, and I've been able to declare them, and I made a switch using the xml id of what was clicked, but I need a parameter for the setOnClickListener method when I call it, and all that will work is null. I have also tried passing in this, so the method has context.
Here's some of the code:
add.setOnClickListener(null);
sub.setOnClickListener(null);
mult.setOnClickListener(null);
div.setOnClickListener(null);
equal.setOnClickListener(null);

The parameter has to be an instance of some object that implements the OnClickListener interface. One way to do it is to use an anonymous inner class:
add.setOnClickListener(new OnClickListener{
public void onClick(View view){
//your event handler code here
}
});
another way is to make your class implement OnClickListener --do that by changing your declaration to look like:
public class MyActivity extends Activity implements OnClickListener{
then define an implementation for the onClick method:
public void onClick(View view){
if(view == add){
//handle add button click
}else if (view == sub){
//handle sub button click
}
//etc
}
then to install the listener you could do:
add.setOnClickListener(this);

You are supposed to pass View.OnClickListener to this function, which is a listener that will get called once the button is clicked.
To do that, you can either:
Declare this listener in the layout XML, with the button, as specified in Button 4 in this site.
Create an instance of View.OnClickListener and pass it to setOnClickListener method as in the example below (Taken from android site which is a great source):
// Create an anonymous implementation of OnClickListener
private OnClickListener mCorkyListener = new OnClickListener() {
public void onClick(View v) {
// do something when the button is clicked
}
};
protected void onCreate(Bundle savedValues) {
...
// Capture our button from layout
Button button = (Button)findViewById(R.id.corky);
// Register the onClick listener with the implementation above
button.setOnClickListener(mCorkyListener);
...
}
Since View.OnClickListener is an interface, your activity may implement it as well, and be itself the listener, in this case, you will pass the activity instance(this) to the setOnClickListener method, but this is just one option, and not that recommended IMHO.

Coming from a .NET background, I struggled with the same thing at first. It's just a different syntax than .NET as java doesn't support properties, or events like I was used to. Here's a simple example of how to do this using a class level click listener variable...
#Override
private void onCreate(Bundle bundle) {
myButton.setOnClickListener(this.genericButtonListener);
}
private OnClickListener genericButtonListener = new OnClickListener() {
#Override
public void onClick(View v) {
//v represents your button
}
};

You need a concrete class here. For example:
imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// your code here
}
});

If you look at documentation, you will notice it takes View.OnClickListener as parameter. If you need five separate listeners, which you are not going to use anywhere else, you can pass an anonymous class implementing onClick(View v), like this
add.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
//do required actions here
}
});

Android - Two onClick listeners and one button

I have a custom TextView which is clickable. It defines its own onClick handler in order to change its appearance based on clicks. However if I then define a second onClick handler in my activity in order to do something based on the button being clicked, only one of the onClick functions is called. onClick is a void function - is there any way to say I didn't process this click, please pass it on to other onClick handlers?
To be more clear here is the code:
Inside MyCheckButton which extends TextView I have:
setOnClickListener( mClickListener );
private OnClickListener mClickListener = new OnClickListener() {
public void onClick(View v) {
toggle();
}
};
However I include MyCheckButton into my Activity, and of course I need to do something when its clicked so I attach another OnClickListener to it:
MyCheckButton button= (MyCheckButtonButton) findViewById(R.id.cb);
button.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
// do something in the app
}
});
By calling setOnClickListener twice it appears that I am replacing the original listener so toggle() which changes the appearance is never called. How can I do something in my activity when this button is clicked if it is already using the onClick handler to change its appearance? I thought I would simply see both OnClickListeners getting called.

This is a bit dirty, but the way I would do this if you need multiple listeners is to register one that knows about the other. The first one (the one that's actually registered) will then need to know when to delegate to the other listener based on the conditions of the event. Actually, in reality, there's no real need to have two OnClickListener classes. The second class can implement whatever interface you want. Additionally, there's no need to create a special interface for what you need.
public class MyClickListener implements OnClickListener{
private SomeCustomClass mSecondListener = new SomeCustomClass();
public void onClick(View v){
if (needToForward){
mSecondListener.handleClick(v);
}else{
//handle the click
}
}
}
Then, in your code for your activity, you would do this
MyClickListener lstn = new MyClickListener();
mCheckBox.setOnClickListener(lstn);
Is there a reason this wouldn't work for you?
Alternatively, if you wanted, the second class could also implement the OnClickListener interface.
Additionally, if you need true bubbling, you could define your own interface that supports adding multiple click listeners to an intermediate class that happens to implement the OnClickListener interface. From there, in that class's onClick() method, you would iterate through the registered listeners calling the appropriate method.

A cleaner approach would be to use the CompositeListener pattern.
Taken from:
how can I set up multiple listeners for one event?
You'd have to add this class in your project:
/**
* Aux class to collect multiple click listeners.
*/
class CompositeListener implements OnClickListener {
private List<OnClickListener> registeredListeners = new ArrayList<OnClickListener>();
public void registerListener (OnClickListener listener) {
registeredListeners.add(listener);
}
#Override
public void onClick(View v) {
for(OnClickListener listener:registeredListeners) {
listener.onClick(View v);
}
}
}
Then add this on your MyCheckButton
private CompositeListener clickListener = new CompositeListener();
public MyCheckButton()
{
super.setOnClickListener(clickListener); //multi event listener initialization
}
#Override
public void setOnClickListener(OnClickListener l) {
clickListener.registerListener(l);
}
Both your calls to setOnClickListener would go through this override, get added to the list and get called when the event is fired. Hope it helps.

Since it appears I can only have one onClickListener per View. What I think I have to do is define an interface:
public interface MyOnClickListener {
public void onMyClick(View v);
}
Implement it from my activity and override the onMyClick function to do whatever I want and in the MyCheckButton class I'll need to pass a MyOnClickListener in the constructor save it and call listener.onMyClick inside the onClick handler.
Let me know if theres a better way. I considered using the onTouch handler in either the activity or the MyCheckButton class, but later if I add onTouch or onClick to either one I will get a difficult to notice bug.
My idea doesn't work because I don't know how to get a reference to the activity from my constructor:
public class TVCheckButton extends TextView {
private MyOnClickListener mListener;
public TVCheckButton(Context context, AttributeSet attrs) {
super(context, attrs);
mListener = ???;
}
}

Since only one OnclickListener works on Android 2.1 [I don't know about later versions) make the view private and static and create a static function that can change it e.g.
public class ExampleActivity extends Activity{
private SomeOtherclass someOtherClass;
private static Button b_replay;
public void onCreate(Bundle savedInstanceState){
someOtherClass = new SomeOtherclass();
b_replay = (Button) findViewById(R.id.b_replay);
b_replay.setOnClickListener(someOtherClass);
}
public static void changeReplayText(String text){
b_replay.setText(text);
}
}

A nice generic approach is to use a list of listeners, such as ListenerList and WeakListenerList from the Beryl library.

For some reason I could not use the answers above so here is an alternative:
//I had all of this in one method where I had two buttons, and based on external factors one would be visible and other would not aka 'gone'. So, I had that checked out! Hope it helps someone!!
Button b = (Button) findViewById(R.id.b_reset);
Button breakk = (Button) findViewById(R.id.b_break);
if ((findViewById(R.id.b_reset)).getVisibility() == View.VISIBLE) {
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//some code and methods...
}
});
} else if ((findViewById(R.id.b_break)).getVisibility() == View.VISIBLE) {
breakk.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//some code and methods...
}
});
}

In the first class, define a virtual button:
private static Button myVirtualButton = new Button(context);
... and a public method to register it:
public static void registerMyVirtualButton(Button b) { myVirtualButton = b;}
In the OnClickListener do whatever action is desired, and in the end, softclick the virtual button:
if (myVirtualButton!=null) { myVirtualButton.callOnClick(); }
In the second class, define a button and its OnClickListener with whatever action is additionally desired.
Transmit the button to the first class via registerMyVirtualButton.
Upon clicking the object of the first class, both actions will be executed.

You can attach an OnClick listener to the button in the following way :
Button button= (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
// do something
}
});
Similarily, your TextView should have it's on OnClick listener.