Databases
StackOverflow2013
Postsdbo
POCan you point out the issue with ListView in this code?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POCan you point out the issue with ListView in this code?
    primarykey
    data
    text
    <p>Following is some test code , done to recreate a strange bug: After deleting some items from a ListView , it stops refreshing when data is invalidated. More items are deleted but list does not refresh. Even Log cat does not show debug messages for deletion. I will appreciate if any one could find out what's wrong.</p> <p>Item Layout:</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal"&gt; &lt;TextView android:id="@+id/nameTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;Button android:id="@+id/deleteButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Delete" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>Item class:</p> <pre><code>import android.content.Context; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.widget.Button; import android.widget.TextView; public class Item implements View.OnClickListener { private String name; private View itemView; private MyActivity owner; //--- getters-- public String getName() { return name; } public View getView() { return itemView; } public Item(String n, Context c , MyActivity o) { //---store the name given-- name = n; //---store reference to the owner activity-- owner = o; //--- create a View for this item---- LayoutInflater inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); itemView = inflater.inflate(R.layout.item,null); //---set up data to show-- TextView nameTextView = (TextView) itemView.findViewById(R.id.nameTextView); Button deleteButton = (Button) itemView.findViewById(R.id.deleteButton); nameTextView.setText(name); //---set up events to be handled-- deleteButton.setOnClickListener(this); Log.d("My_Test","Item: Hello world, my name is " + name); } //----request owner to delete this item--- @Override public void onClick(View view) { Log.d("My_Test","Item:"+name+" requesting owner to delete me"); owner.deleteItem(this); } </code></pre> <p>Activity layout:</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;ListView android:id="@+id/myListView" android:layout_width="fill_parent" android:layout_height="fill_parent" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>Activity class:</p> <pre><code>import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; import java.util.ArrayList; public class MyActivity extends Activity { private ArrayList&lt;Item&gt; myItems; private ListView myListView; private ArrayAdapter&lt;Item&gt; myArrayAdapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //-----adapter for item list---- //----since each item has its own view , it just returns the same--- myArrayAdapter = new ArrayAdapter&lt;Item&gt;(this,0){ @Override public View getView(final int position, View convertView, ViewGroup parent) { Item item = getItem(position); Log.d("My_Test","Adapter : View for Item: " + item.getName() +"is requested." ); return item.getView(); } }; //-----set up my list view with the adapter------ myListView = (ListView) findViewById(R.id.myListView); myListView.setAdapter(myArrayAdapter); //------add items------- //----each item has its own view and a reference to this activity as their owner---- myArrayAdapter.add(new Item("Sunday", this, this)); myArrayAdapter.add(new Item("Monday", this, this)); myArrayAdapter.add(new Item("Tuesday", this, this)); myArrayAdapter.add(new Item("Wednesday", this, this)); myArrayAdapter.add(new Item("Thursday", this, this)); myArrayAdapter.add(new Item("Friday", this, this)); myArrayAdapter.add(new Item("Saturday", this, this)); myArrayAdapter.notifyDataSetChanged(); } //----- called by items requesting to be deleted from the item list---- public void deleteItem(Item item) { myArrayAdapter.remove(item); Log.d("My_Test","Owner : Deleted item :" + item.getName()); myArrayAdapter.notifyDataSetChanged(); } } </code></pre> <p>Looks like ListView stops re-drawing it self. Even when List Item is no more in the item array, and <code>myAdapter.notifyDataSetInvalidated();</code> is called, The List Item stays visible , with further code execution some how blocked.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USS.D.
    1. USS.D.
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POCan you point out the issue with ListView in this code?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POCan you point out the issue with ListView in this code?
      1. USS.D.
      1. VTFavorite
    1. COtry myAdapter.notifyDataSetChanged()
      singulars
      1. POCan you point out the issue with ListView in this code?
      1. USG_S
    2. COWhy are you trying to manage an arraylist inside of an adapter? You do realize the adapter already performs all of these functions for you? You should only have to override the getView method. If you want to modify.. call adapter.add() or adapter.delete() and then notifyDataSetChanged()
      singulars
      1. POCan you point out the issue with ListView in this code?
      1. USJoel
    3. COWhat is the error in logcat?
      singulars
      1. POCan you point out the issue with ListView in this code?
      1. USAkshay
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload