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Android Android Lists and Adapters (2015) Acting on List Item Taps Tapping on a ListView Item

Charles Harpke
Charles Harpke
33,986 Points
Posted by Charles Harpke
Charles Harpke
33,986 Points

Now we can do something with the item that was tapped on. We have a helper method, sendVote(), that will log the user's

The helper method sendVote is supposed to log the user's vote for their favorite game...Am I calling a 'send vote()' in the item click listener?

import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.view.ListView;

public class GameListActivity extends ListActivity {

    public String[] mGames = {
        "Age of Empires",
        "Civilization",
        "Minecraft",
        "SimCity"
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_game_list);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mGames);
        setListAdapter(adapter);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        // Add code here!
      super.onListItemClick(l, v, position, id);
    }

    // This is a helper method to tally votes on a back-end system
    public void sendVote(String game) {
        VoteService.recordVote(game);
    }
}

```java

```GameListActivity.java
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.view.ListView;

public class GameListActivity extends ListActivity {

    public String[] mGames = {
        "Age of Empires",
        "Civilization",
        "Minecraft",
        "SimCity"
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_game_list);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mGames);
        setListAdapter(adapter);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        // Add code here!
      super.onListItemClick(l, v, position, id);
    }

    // This is a helper method to tally votes on a back-end system
    public void sendVote(String game) {
        VoteService.recordVote(game);
    }
}

1 Answer

Ryan Ruscett
Ryan Ruscett
23,309 Points
Ryan Ruscett
Ryan Ruscett
23,309 Points

Hola,

In short yes you are correct. You need to call the sendVote() method inside the on list item click. BUTTT! There is always a but huh.

You need to pass it the proper game from the String Array mGames to the sendVote method.

So first we have the game list

 public String[] mGames = {
        "Age of Empires",
        "Civilization",
        "Minecraft",
        "SimCity"
    };

Ok so check it out. Below is the method for the onListItemClick. We are getting a listView ok fine, but we don't care about that. I mean, I can't get a game from my list with a LIstView I can only display the games. Ok, next we have View v aahhh naaa that is again, just another view. Next we have int position OHHHH ok that sounds pretty good. Let's double check. What comes next? A long... Huh, I can't get a game from a string array with a long. So it looks like position it is. I can get a value from a string array based on it's index. Which is an integer. 

 protected void onListItemClick(ListView l, View v, int position, long id) {
        // Add code here!
      super.onListItemClick(l, v, position, id);
      String gameValue = mGames[position];

Ok, so for the good part.

I need to take my position, use that to grab whatever game is in the array at that position I clicked from the listVIew. Return it to a variable, and call sendVote(passInTheGameIGotByUsingPosition)

protected void onListItemClick(ListView l, View v, int position, long id) {
        // Add code here!
      super.onListItemClick(l, v, position, id);
     String gameValue = mGames[position];   
     sendVote(gameValue);

Does this help answer you question? If not please let me know and I can try to explain it, a different way.