I am populating a TableLayout (i.e. rows and columns) with data (strings).
When I click on a cell, I would like the data stored in this cell to be displayed in my console.
How can I do that? Is there any other way than to go over IDs?
As stated in http://developer.android.com/resources/tutorials/views/hello-tablelayout.html , there is no Column or TD (Table Data) or Cell equivalent in android. Each element is treated as an individual cell unless otherwise noted.
Having this in mine, and given the fact that you don't specify what kind of View you're using inside your rows, may I guess it's a Button which you can of course click with something like this:
Button b = (Button)findViewById(R.id.oneOfMyButtons); // You could create this "on the go"
b.setOnClickListener(new View.OnClickListener{
public void onClick(View v){
System.out.println(v.getText());
}
}
Hope this helps.
TableLayout extends LinearLayout, which do not have an OnItemClickListener method. You will need to implement OnClickListener in the child Views instead.
What you can do instead is to use a GridView, that implements AdapterView and thus you can use OnItemClickListener
http://developer.android.com/resources/tutorials/views/hello-gridview.html
http://developer.android.com/reference/android/widget/AdapterView.html#setOnItemClickListener%28android.widget.AdapterView.OnItemClickListener%29
abstract void onItemClick(AdapterView<?> parent, View view, int position, long id)
Callback method to be invoked when an item in this AdapterView has been clicked.
Related
I have a listview. What I've implemented in that listview is that when user clicks a list item a 2 button view is inflated to replace the content of that list item like this:
This works fine but what I want is when I click the second list item the first one should come back to its original layout. Currently, it is like this:
This is my code implemented in onClick method of listview:
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
TextView planName = view.findViewById(R.id.planNameText);
TextView planDate = view.findViewById(R.id.planDateText);
ImageView planImage = view.findViewById(R.id.homePlanImageView);
planName.setVisibility(View.INVISIBLE);
planDate.setVisibility(View.INVISIBLE);
planImage.setVisibility(View.INVISIBLE);
RelativeLayout rl_inflate = (RelativeLayout)view.findViewById(R.id.rl_inflate);
View child = getLayoutInflater().inflate(R.layout.inflate, null);
rl_inflate.addView(child);
}
});
Thanks.
Maybe you need to initialice a boolean variable to check if is clicked or not and refresh all the views. I really recommend you to use a RecyclerView and use 2 viewHolders. If you want information about this check this. If you implement a recycler with 2 viewholder it will be easier than the way that you want to implement it, and you can use notifyDataSetChanged to refresh the recycler. Whatever, you will need anyways a boolean to check if is clicked or not.
I have a GridView adapter displaying a grid of Buttons. Now I want to set up an OnClickListener for my buttons but of course they don't have their own R.id I can access as they are added to the grid via the adapter, rather than a layout.xml.
I tried to use OnItemClickListener as follows:
m_onItemClickListener = new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
switch(pos) {
case MyConstants.POS_OF_BUTTON_1:
// Do stuff...
break;
case MyConstants.POS_OF_BUTTON_2:
// Do stuff...
break;
}
}
};
But to my understanding you can't use a clickable or focusable item with OnItemClickListener. How do I get round this? Thanks!
There are more elegant ways to do this whole thing (starting from using a RecyclerView with a GridLayoutManager instead of a GridView), but if you're looking for the quick and easy solution to use with what you already have, this is what you can do:
First of all, you should set some ID on your buttons, they don't have to come from R.id (although it would be preferable if you inflated the views from a layout, with an ID defined there, and used a ViewHolder).
Worst case, you can just define constants in your adapter for the IDs you want to use for each kind of button (e.g. static final int DELETE_BUTTON = 1;), and then set these IDs on the buttons manually, in code.
Then you can pass a simple OnClickListener (not OnItemClickListener), which handles clicks of all these different buttons in a single item, to your adapter, and make the adapter set the listener on each of these buttons, for each of the item views in the grid.
You will also need to set the position of the item as a tag on the button view itself, so that when the click happens, you can determine for which item the click happened.
Sample code as follows:
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
Object tag = v.getTag();
if (!(tag instanceof Integer)) {
// Show error message or just throw an exception.
}
int position = (Integer) tag;
// We get the item at this position, to know which one to use
Item item = adapter.getItem(position);
switch (v.getId()) {
case DELETE_BUTTON:
// Delete stuff here
break;
case EDIT_BUTTON:
// Edit stuff here
break;
...
}
}
};
adapter.setOnClickListener(listener);
Then, in the getView method of the adapter, you need to set this listener on each of the buttons and also set the position of the item as a tag on the buttons. This way, you will be able to figure out to which item the button belongs to, in the listener code above.
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
...
deleteButton.setId(DELETE_BUTTON);
deleteButton.setOnClickListener(listener);
deleteButton.setTag(i);
...
}
In general, I sincerely urge you to also look into the ViewHolder pattern, and RecyclerView and GridLayoutManager when you have time. Most of this will translate there as well.
EDIT
In order to make multiple Views clickable/focusable inside a list/grid item, you need to set the descendantFocusability attribute to blocksDescendants on the root view of the item, either simply in the XML, or in code via:
viewGroup.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
Let me explain myself:
As you know, when you've a view which have to be inflated several times, but changing values, you use a GridView or a ListView. Those two Composite views, have some methods like onItemClick. This method is so useful, as it returns the position of the view clicked.
With this position you can perform some concrete tasks, like retreiving from an ArrayList, the information of that object. Here's an example:
ArrayList<DocumentInfo> documents;
And when you set a setOnItemClickListener() you can get the correct values:
gallery.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> arg0, View v, int pos, long arg3) {
getDocumentInfoOf(pos);
}
});
public void getDocumentInfoOf(int position){
DocumentInfo doc = documents.get(position);
}
However, when you aren't using a GridView or a ListView, you're in your own. You don't have a clear way (AFAIK) to know which layout inflated is the one clicked (I mean like the previous example, the "position" value).
What I am currently doing, is the following:
for (int i=0; i<10;i++){
RelativeLayout documentInflated = (RelativeLayout) this.mInflater.inflate(R.layout.open_document_per_inflar, null);
documentInflated.setContentDescription(""+i);
documentInflated.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
openDocument(v);
}
});
container.addView(documentInflated);
}
public void openDocument(View v){
int idDocument = Integer.parseInt(v.getContentDescription());
//idDocument is the view clicked
}
Do you guys think this is a clear way of doing this?
Thank you!!!
If I'm not mistaken you want to get some data from your created Relative Layout when you click on it. The best solution here is to use the method setTag(Object tag). After that you get the informatiom with the method getTag(). This method allows you to add extra information to your view. As it says in the documentation:
Tags
Unlike IDs, tags are not used to identify views. Tags are essentially an extra piece of information that can be associated with a view. They are most often used as a convenience to store data related to views in the views themselves rather than by putting them in a separate structure.
Also depending on your needs you can seperate every tag with a key -> value pair with the method setTag(int key, Object tag), after that you can retrieve this object with getTag(int key);
So in your case you will have
documentInflated.setTag(i)
in the onClick yo will then have:
int i = (int)v.getTag();
Unless I'm not understanding your desire...
#Override
public void onClick(View v) {
openDocument(v);
}
v IS the view being clicked. Your code looks like it should do what you're hoping it will do. What are you actually seeing happen?
I have a list view that uses different layout sheets for different rows. Each sheet has different variables on them. So, when I want to implement the click listener for my list I need to know which type of row I am clicking on so that I can try to access to the correct values. For example:
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//do this for layout A
//......
// do that for layout B
//......
}
});
How can I access to the layout information and the corresponding values ?
Make sure that you have a variable in your activity where you've kept the data with which you've populated the adapter.
Then, based on the position variable, you'll be able to get the exact row which was clicked. Then based on the row, you'll be able to figure out what type of row it is, right? :)
you can use the method:
public abstract int getItemViewType (int position) of your custom adapter.
I have a list of players whos name are displayed listview. and each row of listview contains button, textview and imageview. How can I get the value of textview?
If you are using Custom Adapter class to populate the listview,then in your adapter,you can use HashMap for saving key-value pair,saving position of listitem with the data into that textview.and then you can easily retrieve it on OnItemClickListener of listview.
Depending on the specifics of your implementation, I would go with one of the following approaches.
Option A.
Use setOnItemClickListener to register a click listener with the list (or if you're using a ListActivity or ListFragment simply use [onListItemClick](http://developer.android.com/reference/android/app/ListActivity.html#onListItemClick%28android.widget.ListView, android.view.View, int, long%29)). onItemClick gets passed in the View that was clicked and can be used to retrieve nested views, e.g. the TextView you're looking for.
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
TextView tv = (TextView) view.findViewById(R.id.textview);
String tvText = tv.getText();
}
}
Option B
Assuming you fill your list from some sort of data collection, you may be able to do something similar to above, but use the passed position parameter as an index to directly get the text from the objects in your collection; i.e.:
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
SomeObject so = myCollection.get(position);
String tvText = so.getTextViewText();
}
}
There are lots of more options though. I kind of like creating my own extension of ArrayAdapter to hold the models for the views of the items in the list. That way you could also call getItemAtPosition(int position) or getItem(int position) and cast the returned object to your data type.
Is it a static list or a dynamically generated one? If its a static one you can assign a different id to each textview in the xml itself, and then use FindViewById to access it. If it's not this is what you've got to do: you will obviously have one row and display it many times. So multiple textviews will have same ID. Use a for loop, inside which use FindViewById(Remember FindViewByID will only access the first element with mentioned Id, set its Id to something else, in the next iteration the next textview is selected, set its Id to something) then use these new ids to access them, thus you can access each textview