I have a ListView filled with items. I'd like to set an onClickListener to show details about the item that was clicked. How can I determine which item was clicked within the onClickListener? The View, or v has a lot of methods available that I've looked through and don't see anything pertaining to getting the object clicked on.
//populate the activity list
ListView teamsListView = (ListView) activity.findViewById(R.id.teamsListView);
ArrayList<HashMap<String, String>> listData = new ArrayList<HashMap<String, String>>();
HashMap<String, String> listItem;
for (TeamSet teamSet : response.getTeamSetList()) {
listItem = new HashMap<String, String>();
listItem.put("name", teamSet.getName());
//listItem.put("teamCount", Integer.toString(teamSet.getTeams().size()));
listData.add(listItem);
}
teamsListView.setAdapter(
new SimpleAdapter(
context,
listData,
R.layout.teams_list_row,
new String[]{"name"},
new int[]{R.id.teamsTeamListName}
)
);
//show details on a team
TextView team = (TextView) activity.findViewById(R.id.teamsTeamListName);
team.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//how do I know which item was clicked? I want to load more details on the item...
}
});
You use a OnItemClickListener not a onCLickListener
You do something like this:
final ListView lv = (ListView) findViewById(R.id.ListView01);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> myAdapter, View myView, int myItemInt, long mylng) {
String selectedFromList =(String) (lv.getItemAtPosition(myItemInt));
}
});
Hope this helped.
Related
I have a ListView that displays an ArrayList that is dynamically created using an adapter. However, certain elements of each list item view are calculated based on previous item values. I am using Intents to open another activity where the user can edit a selected list item, and the updates are passed back to the main activity. In the main activity I've placed the getIntent, and the associated setters, after the ArrayList is generated and before the adapter. When the main activity is first created the adapter correctly calculates all list view items. But when the user accepts updates in the edit activity and returns to the main activity, only the selected list item is updated. Having the entire list cycle through and update would be fine (it will never be a very long list), but I'm a little surprised that only the selected list item is getting updated. I expected that either the adapter would run as it does when the activity is first created and all items would get updated, or that it wouldn't run at all and none would get updated.
public class MainActivity extends AppCompatActivity {
private final Context thisContext = MainActivity.this;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView planListView = findViewById(R.id.plan_listview);
final ArrayList<ItemProfile> planSteps = BuildPlan();
if(getIntent().getExtras() != null)
{
int stepNumber = getIntent().getIntExtra("stepNumber", 0);
ItemProfile thisStep = (ItemProfile) getIntent().getSerializableExtra("itemProfile");
planSteps.get(stepNumber-1).setDepth(thisStep.getDepth());
planSteps.get(stepNumber-1).setTime(thisStep.getTime());
planSteps.get(stepNumber-1).setInterval(thisStep.getInterval());
}
ItemsListAdapter planAdapter = new ItemsListAdapter(this, planSteps);
planListView.setAdapter(planAdapter);
planListView.setOnItemClickListener(
new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l)
{
int index = pos-1;
Intent i = new Intent(thisContext, EditItemActivity.class);
i.putExtra("stepNumber", pos);
i.putExtra("stepProfile", planSteps.get(index));
if (index > 0)
{
i.putExtra("groupStart", planSteps.get(index-1).getGroupEnd());
}
startActivity(i);
}
}
);
}
}
Update... I've added the mainActivity code. It creates an ArrayList plan (I'm using a BuildPlan method to populate a dummy plan while I'm developing) then checks for an intent that is returning an updated plan step. If an intent exists the specified step is updated in the plan. The list adapter is then created and set. Finally the clickListener is created and set.
I've done something relatively similar but I used dynamic spinners and listviews from a database.
Here is the code. Basically you invalidate the list view, reset the data and call notifyDataSetChanged() on the adapter.
public ListView lv;
Spinner suburbSpinner;
ArrayAdapter<String> suburbAdapter;
ArrayList<String> suburbs = new ArrayList<>();
ArrayList<Resource> resources = new ArrayList<>();
ArrayAdapter<Resource> arrayAdapter;
public void updateList(String type, String suburb, String businessType, int suburbPos) {
DatabaseHelper db = new DatabaseHelper(this, "fairCanberraDB", null, 1);
lv = findViewById(R.id.list);
// Reset suburb spinner, get new list view resources.
lv.invalidateViews();
resources = db.resourceQuery(type, suburb, businessType);
System.out.println("resource: " + resources);
ArrayList<Resource> suburbQuery = db.resourceQuery(type, "All", businessType);
Spinner suburbSpinner = findViewById(R.id.suburbSpinner);
suburbs.clear();
suburbs.add("All");
for (int x = 0; x < suburbQuery.size(); x++) {
if (suburbs.contains(suburbQuery.get(x).getSuburb())) {
continue;
} else {
suburbs.add(suburbQuery.get(x).getSuburb());
}
}
db.close();
suburbAdapter.notifyDataSetChanged();
arrayAdapter.notifyDataSetChanged();
ArrayAdapter<Resource> arrayAdapter = new ArrayAdapter<Resource>(
this,
android.R.layout.simple_list_item_1,
resources);
lv.setAdapter(arrayAdapter);
if(suburbPos < suburbSpinner.getCount())
{ suburbSpinner.setSelection(suburbPos);}
setSpinnerListener(suburbSpinner);
}
// Register listener for a spinner
public void setSpinnerListener(Spinner spinner)
{
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
Spinner typeSpinner = (Spinner) findViewById(R.id.typeSpinner);
Spinner businessTypeSpinner = (Spinner) findViewById(R.id.businessTypeSpinner);
Spinner suburbSpinner = (Spinner) findViewById(R.id.suburbSpinner);
String businessType = businessTypeSpinner.getSelectedItem().toString();
if(businessType.contains("Private"))
{
businessType = "private user";
}
updateList(typeSpinner.getSelectedItem().toString(), suburbSpinner.getSelectedItem().toString(),
businessType, suburbSpinner.getSelectedItemPosition());
}
How my onClickListener should look like if I need to open layout with different text for each ListView item and I have a lot of ListView items (about 50)? Do I need to create new activity or layout file for each new item? Is it possible to use one activity for all items?
This is my MainActivity.java:
public class MainActivity extends Activity {
// ListView
private ListView listView;
// Adapter
ArrayAdapter<String> adapter;
String items [];
// ArrayList
ArrayList<HashMap<String, String>> productList;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//ListView data in res/values/arrays.xml
items =getResources().getStringArray(R.array.items);
listView = (ListView) findViewById(R.id.list_view);
adapter = new ArrayAdapter<String>(this, R.layout.list_item, R.id.listItem, items);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
/*
I know that I can put here I can put something like this:
case 0 :Intent appInfo = new Intent(About.this, Activity1.class);
startActivity(appInfo);
break;
case 1 :Intent appInfo = new Intent(About.this, Activity2.class);
startActivity(appInfo);
break;
case 2 :Intent appInfo = new Intent(About.this, Activity3.class);
startActivity(appInfo);
break;
BUT DO I NEED REPEAT THIS MORE THAN 20 TIMES?!
*/
}
});
}
}
Some system apps like Settings has a lot of ListView and layouts and I don't believe that it has new activity for each layout.
Create a new single activity and pass the text to that activity.
Something like:
Intent intent = new Intent(About.this, <NEW_ACTIVITY>.class);
intent.putExtra("text_key", items[position]);
startActivity(intent);
on the other activity, retrieve the text like this (can be on the onCreate method):
String text = getIntent().getExtras().getString("text_key");
I am working on android media player. In main.java it includes main.xml and list.java includes
list.xml , I used intent to call list.java (when I press imagebutton) into main.java , But when I press imagebutton list.xml comes up new window I want to show in bottom of the main.xml
In main.java image button calls list.java into main.java
songslist_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(main.this, list.class);
Toast.makeText(main.this, "Song List", Toast.LENGTH_SHORT).show();
startActivityForResult(i, 100);
//Intent i = new Intent(main.this, list.class);
//startActivity(i);
}
});
/////////////////////////
public class list extends ListActivity
{
// Songs list
public ArrayList<HashMap<String, String>> songsLists = new ArrayList<HashMap<String, String>>();
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.list);//list.xml
ArrayList<HashMap<String, String>> songsListData = new ArrayList<HashMap<String, String>>();
SongList plm = new SongList();
// get all songs from sdcard
this.songsLists = plm.getPlayList();
// looping through playlist
for (int i = 0; i < songsLists.size(); i++)
{
// creating new HashMap
HashMap<String, String> song = songsLists.get(i);
// adding HashList to ArrayList
songsListData.add(song);
}
// Adding menuItems to ListView
ListAdapter adapter = new SimpleAdapter(this, songsListData,
R.layout.song_item, new String[] { "songTitle" }, new int[] {R.id.song_title });
setListAdapter(adapter);
// selecting single ListView item
ListView lv = getListView();
//lv = (ListView) findViewById (R.layout.list);
// listening to single listitem click
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,int position, long id)
{
// getting listitem index
int songIndex = position;
// Starting new intent
Intent in = new Intent(getApplicationContext(),main.class);
// Sending songIndex to PlayerActivity
in.putExtra("songIndex", songIndex);
setResult(100, in);
// Closing PlayListView
finish();
}
});
}
}
Is Your main.java class an activity? Your list ist even an activity, so You started a new one, that will be shown in a new window. I think You need another aproach to do this. Read this tutorials first:
http://www.vogella.com/articles/AndroidListView/article.html
http://windrealm.org/tutorials/android/android-listview.php
A possibillity to do such thing is to integrate a simple listView into your main.xml layout and hide this view until button will be pressed.
EDIT
for example:
<ListView android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/mainListView">
</ListView>
put this into Your main.xml, maybe below Your button. Then You can reference the listview in your main.java:
mainListView = (ListView) findViewById( R.id.mainListView );
But there is a lot more to do, so I recommend You to read the tutorials to get a clear conception about how to build a listView.
Help!!
I have a listadapter with a detail view, the problem that I am having is trying to pass values from an xml file to the second view. I can currently do this but only if I show those values in the first view. What I am trying to acheive is on the firstview have just a title and when you click on that title it takes you to a detail view with more information about it.
here is the code that I currently have.
ListAdapter adapter = new SimpleAdapter(this, menuItems,
R.layout.list_item,
new String[] { KEY_USERADDRESS, KEY_DATEDUE}, new int[] {
R.id.name, R.id.cost });
setListAdapter(adapter);
// selecting single ListView item
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
//#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
// String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
String cost = ((TextView)view.findViewById(R.id.cost)).getText().toString();
// String description = ((TextView) view.findViewById(R.id.desciption)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
//in.putExtra(KEY_USERADDRESS, name);
in.putExtra(KEY_DATEDUE, cost);
//in.putExtra(KEY_DESC, description);
startActivity(in);
}
});
}
As you can see I have a list adapter,I only want to show the contents of the KEY_USERADDRESS on the first view and when they click it then the rest will be shown. If I add the rest of the Textviews to the listadapter it makes the textviews to big.
Sorry if I am a little confusing, I'm still a rookie when it comes to android development.
Any help will be appreciated!!
Assuming your data is stored in the menuItems Map object, how about something like this in your onItemClick():
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//Your code here..
Map<String, String> myValueMap = menuItems.get(position);
// Starting new intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(KEY_USERADDRESS, myValueMap.get(KEY_USERADDRESS));
in.putExtra(KEY_DATEDUE, myValueMap.get(KEY_DATEDUE));
in.putExtra(KEY_DESC, myValueMap.get(KEY_DESC));
startActivity(in);
}
the position parameter in the onItemClick can be used to get the selected Map from your menuItems which you used the create your SimpleAdapter to populate the ListView
I have a ListView which after clicking on an item I want it to be permanently selected, so some other action can be taken depending on what button is pressed next. A bit like a RadioBox but within the list view. So when pressed, the background stays yellow and I keep a store of which item is selected. At the moment I have it when it is clicked the the background changes, but haveing weird behavior with when selected and I scroll the ListView the selected item changes.
Code I have:
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
for (int i = 0; i < titles.size(); i++){
HashMap<String, String> map = new HashMap<String, String>();
map.put("name", titles.get(i));
mylist.add(map);
}
SimpleAdapter mSchedule = new SimpleAdapter(this, mylist, R.layout.listcell,
new String[] {"name"}, new int[] {R.id.txtItemName});
ListView listView1 = (ListView) findViewById(R.id.ListView01);
listView1.setAdapter(mSchedule);
listView1.setTextFilterEnabled(true);
listView1.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Log.v("Test", v.toString());
v.setBackgroundResource(R.drawable.newbackground);
}
});
}
The views in a ListView get recycled so if the selected view goes off the screen it is probably being re-used for one of the current visible items. That might be the weird behavior you are describing? If you want to do multiple potential actions based on a item selection usually that is done either by a long-press + showing context menu.
What is the weird behavior?
Track the selected items in a HashSet. Override the SimpleAdapter.getView() method to assign the background resource based on the selectedItems HashSet.
final HashSet<String> selectedItems = new HashSet<String>();
SimpleAdapter mSchedule = new SimpleAdapter(this, mylist, R.layout.listcell,new String[] {"name"}, new int[] {R.id.txtItemName}) {
#Override
public View getView(int position, View v, ViewGroup parent) {
if(v!= null) {
String title = titles.get((int)this.getItemId(position));
if(selectedItems.contains(title)) {
v.setBackgroundResource(R.drawable.newbackground);
} else {
v.setBackgroundResource(0);
}
}
return super.getView(position, v, parent);
}
};
ListView listView1 = (ListView)findViewById(R.id.listView1);
listView1.setAdapter(mSchedule);
listView1.setTextFilterEnabled(true);
listView1.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
String title = titles.get((int)id);
if(selectedItems.contains(title)) {
v.setBackgroundResource(0);
selectedItems.remove(title);
} else {
v.setBackgroundResource(R.drawable.newbackground);
selectedItems.add(title);
}
}
});