I have a update view, where I need to preselect the value stored in database for a Spinner.

I was having in mind something like this, but the `Adapter` has no `indexOf` method, so I am stuck.

    void setSpinner(String value)
	{
	    int pos = getSpinnerField().getAdapter().indexOf(value);
	    getSpinnerField().setSelection(pos);
	}



How to set selected item of Spinner by value, not by position?

**What I want to do**: run a background thread which calculates ListView contents and update ListView partially, while results are calculated.

**What I know I have to avoid**: I cannot mess with ListAdapter contents from background thread, so I inherited AsyncTask and publish result (add entries to adapter) from onProgressUpdate. My Adapter uses ArrayList of result objects, all operations on those arraylists are synchronized.

**Research of other people**: there is very valuable data [here][1]. I also suffered from almost daily crashes for group of ~500 users, and when I added `list.setVisibility(GONE)/trackList.setVisibility(VISIBLE)` block in onProgressUpdate, crashes lowered by a factor of 10 but not disappeared. (it was suggested in [answer][2] )

**What I got sometimes**: please notice, it happens really rarely (once a week for one of 3.5k users). But I&#39;d like to get rid of this bug completely. Here is partial stacktrace:

    `java.lang.IllegalStateException:` The content of the adapter has changed but ListView  did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131296334, class android.widget.ListView) with Adapter(class com.transportoid.Tracks.TrackListAdapter)]
    at android.widget.ListView.layoutChildren(ListView.java:1432)
    at android.widget.AbsListView.onTouchEvent(AbsListView.java:2062)
    at android.widget.ListView.onTouchEvent(ListView.java:3234)
    at android.view.View.dispatchTouchEvent(View.java:3709)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:852)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
    [...]

**Help?** Not needed anymore, see below

**FINAL ANSWER:** As it turned out, I was calling `notifyDataSetChanged` every 5 insertions to avoid flickering and sudden list changes. It cannot be done such way, always notify adapter when base list changes. This bug it long gone for me now.


  [1]: http://permalink.gmane.org/gmane.comp.handhelds.android.devel/82685
  [2]: http://www.mailinglistarchive.com/html/android-developers@googlegroups.com/2010-04/msg01174.html

Android, ListView IllegalStateException: &quot;The content of the adapter has changed but ListView did not receive a notification&quot;

I am attempting to create a custom Adapter for my ListView since each item in the list can have a different view (a link, toggle, or radio group), but when I try to run the Activity that uses the ListView I receive an error and the app stops. The application is targeted for the Android 1.6 platform. 

The code:

 

    public class MenuListAdapter extends BaseAdapter {
     private static final String LOG_KEY = MenuListAdapter.class.getSimpleName();
     
     protected List&lt;MenuItem&gt; list;
     protected Context ctx;
     protected LayoutInflater inflater;
     
     public MenuListAdapter(Context context, List&lt;MenuItem&gt; objects) {
      this.list = objects;
      this.ctx = context;
      this.inflater = (LayoutInflater)this.ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     }
     
     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
      Log.i(LOG_KEY, &quot;Position: &quot; + position + &quot;; convertView = &quot; + convertView + &quot;; parent=&quot; + parent);
      MenuItem item = list.get(position);
      Log.i(LOG_KEY, &quot;Item=&quot; + item );
      
            if (convertView == null)  {
                convertView = this.inflater.inflate(item.getLayout(), null);
            }
            
            return convertView;
     }
    
     @Override
     public boolean areAllItemsEnabled() {
      return false;
     }
    
     @Override
     public boolean isEnabled(int position) {
      return true;
     }
    
     @Override
     public int getCount() {
      return this.list.size();
     }
    
     @Override
     public MenuItem getItem(int position) {
      return this.list.get(position);
     }
    
     @Override
     public long getItemId(int position) {
      return position;
     }
    
     @Override
     public int getItemViewType(int position) {
      Log.i(LOG_KEY, &quot;getItemViewType: &quot; + this.list.get(position).getLayout());
      return this.list.get(position).getLayout();
     }
    
     @Override
     public int getViewTypeCount() {
      Log.i(LOG_KEY, &quot;getViewTypeCount: &quot; + this.list.size());
      return this.list.size();
     }
    
    }

The error I receive:

        java.lang.ArrayIndexOutOfBoundsException
      at android.widget.AbsListView$RecycleBin.addScrapView(AbsListView.java:3523)
      at android.widget.ListView.measureHeightOfChildren(ListView.java:1158)
      at android.widget.ListView.onMeasure(ListView.java:1060)
      at android.view.View.measure(View.java:7703)
     

I do know that the application is returning from `getView` and everything seems in order.

Any ideas on what could be causing this would be appreciated.

Thanks,

-Dan

ArrayIndexOutOfBoundsException with custom Android Adapter for multiple views in ListView

Has anyone ever used the [Bridge pattern][1] in a real world application? If so, how did you use it? Is it me, or is it just the [Adapter pattern][2] with a little dependency injection thrown into the mix? Does it really deserve its own pattern?

[1]: https://www.dofactory.com/net/bridge-design-pattern
[2]: https://www.dofactory.com/net/adapter-design-pattern

When to use the Bridge pattern and how is it different from the Adapter pattern?

I&#39;m curious about the purpose of the methods [`getItem`][1] and [`getItemId`][2] in the class Adapter in the Android SDK.

From the description, it seems that `getItem` should return the underlying data.  So, if I have an array of names `[&quot;cat&quot;,&quot;dog&quot;,&quot;red&quot;]` and I create an adapter *`a`* using that, then *`a.getItem(1)`* should return &quot;dog&quot;, correct?  What should *`a.getItemId(1)`* return?

If you&#39;ve made use of these methods in practice, could you provide an example?


  [1]: http://developer.android.com/reference/android/widget/Adapter.html#getItem%28int%29
  [2]: http://developer.android.com/reference/android/widget/Adapter.html#getItemId%28int%29

What is the intent of the methods getItem and getItemId in the Android class BaseAdapter?

What is the difference between the Bridge and Adapter patterns?

Difference between Bridge pattern and Adapter pattern

What is the difference between the *Facade*, *Proxy*, *Adapter*, and *Decorator* design patterns?

From a generic point of view, such patterns seem to do the same thing, that is: **wrap an API and provide access to it**.

*How to distinguish these patterns?\
How to discern when one pattern suits more than the others?*

Difference between the Facade, Proxy, Adapter and Decorator design patterns?

In the user interface there has to be a spinner which contains some names (the names are visible) and each name has its own ID (the IDs are not equal to display sequence). When the user selects the name from the list the variable currentID has to be changed.

The application contains the ArrayList&lt;User&gt;

Where User is an object with ID and name:

    public class User{
            public int ID;
            public String name;
        }

What I don&#39;t know is how to create a spinner which displays the list of user&#39;s names and bind spinner items to IDs so when the spinner item is selected/changed the variable currentID is set to appropriate value.

I would appreciate if anyone could show the solution of the described problem or provide any link useful to solve the problem.

Thanks!


Android: How to bind spinner to custom object list?

I&#39;ve been reading both definitions and they seem quite the same. 

***Could anyone point out what are their differences?***


What is the difference between the Facade and Adapter Pattern?

I want to know *when*, *where* and *how* adapters are used in the context of Android.

The information from Android&#39;s developer documentation was insufficient for me and I&#39;d like to get a more detailed analysis.

What&#39;s the role of adapters in Android?

Is it possible to call method that is defined in `Activity` from `ListAdapter`?

(I want to make a `Button` in `list&#39;s` row and when this button is clicked, it should perform the method, that is defined in corresponding Activity. I tried to set `onClickListener` in my `ListAdapter` but I don&#39;t know how to call this method, what&#39;s its path...) 

when I used `Activity.this.method()` I get the following error:

    No enclosing instance of the type Activity is accessible in scope

Any Idea ?

Call Activity method from adapter

I want to demonstrate use of [Adapter Pattern][1] to my team. I&#39;ve read many books and articles online. Everyone is citing an example which are useful to understand the concept (Shape, Memory Card, Electronic Adapter etc.), but there is no real case study.

Can you please share any case study of Adapter Pattern?

p.s. I tried searching existing questions on stackoverflow, but did not find the answer so posting it as a new question. If you know there&#39;s already an answer for this, then please redirect.


  [1]: https://en.wikipedia.org/wiki/Adapter_pattern

adapter-Any real example of Adapter Pattern

I just upgraded my laptop from Windows 7 to Windows 10 and found that I am unable to start Virtualbox VMs configured with a bridged adapter.

See the configuration below:

[![Virtualbox preferences 1][1]][1]

[![Virtualbox preferences 2][2]][2]


  [1]: http://i.stack.imgur.com/AckzK.png
  [2]: http://i.stack.imgur.com/UpVTc.png

Bridged networking not working in Virtualbox under Windows 10

I have a little problem with `ListView`. How do I clear a `ListView` content, knowing that it has a custom adapter?

`edit` -
the custom adapter class extends `BaseAdapter`, it looks like this:


    import android.app.Activity;
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.TextView;
    
    public class MyAdapter extends BaseAdapter {
    	
        private Activity activity;
        private String[] data;
        private static LayoutInflater inflater = null;
    	
    	public MyAdapter(Activity a, String[] str) {
    		activity = a;
    		data = str;
            inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    	}
    	
        public static class ViewHolder {
            public TextView text;
        }
    
    	@Override
    	public int getCount() {
    		return data.length;
    	}
    
    	@Override
    	public Object getItem(int position) {
    		return position;
    	}
    
    	@Override
    	public long getItemId(int position) {
    		return position;
    	}
    
    	@Override
    	public View getView(int position, View view, ViewGroup parent) {
    		View v = view;
    		ViewHolder holder;
    		if (v == null) {
                v = inflater.inflate(R.layout.rowa, null);
                holder = new ViewHolder();
                holder.text= v.findViewById(R.id.dexter);
                v.setTag(holder);
    		} else {
    			holder = v.getTag();
    		}
    		
    		holder.text.setText(data[position]);
    		
    		return v;
    	}
    
    }

Clear listview content?

I have a ListActivity with my customized adapter and inside each of the view, it may have some buttons, in which I need to implement `OnClickListener`. I need to implement the `OnClickListener` in the adapter. However, I don&#39;t know how to call the function like `startActivity()` or `setResult()`. Since the adapter doesn&#39;t extend to Activity. 

So what is the best way to solve this problem? 

Thanks.




How to start Activity in adapter?

^^

i get this error if i would connect to any OpenVPN Network.

    All TAP-Win32 adapters on this system are currently in use.

**Here is a Screenshot.**
-&gt; http://www.abload.de/image.php?img=openvpn_failbhjde.jpg

**What i did before i post this?**

 - Removing the TAP-Win32 Adapter OAS
 - Reinstall openvpn
 - Reinstall openvpn gui

I have the problem on two computers.
**Why?**


**My System:**

 - Windows 7 Professional 64-Bit
 - Normal Network Interface
 - VirtualBox Network Interface
 - TAP-Win32 Adapter OAS

All *legal*. All *up-to-date* (newest, stable version).


**Solution**

 1. Download OpenVPN manually: http://openvpn.net/index.php/download/community-downloads.html

:)

OpenVPN failed connection / All TAP-Win32 adapters on this system are currently in use

I&#39;m trying to implement filtering of a ListView which is uses a custom object adapter, but I can&#39;t find any useful samples. The included code is very simplified, so no- keep in mind I can&#39;t use an regular ArrayAdapter.
I have a EditText above the ListView, and when the user enters text in the EditText widget I would like to filter the ListView by the text written in the EditText.
Any suggestions would be much appreciated!

Here is the snippet from the activity class:

    public class management_objects extends Activity {
	
	private static List&lt;User&gt; UserList;
	private EfficientAdapter adapter = null;
	private ListView objectListView = null;
	private EditText SearchText = null;
	
	private static class EfficientAdapter extends BaseAdapter implements Filterable{
		private LayoutInflater mInflater;	
		
		public EfficientAdapter(Context context) {
			mInflater = LayoutInflater.from(context);
		}
		
		public int getCount() {
			return UserList.size();
		}

		public Object getItem(int position) {
			return position;
		}

		public long getItemId(int position) {
			return position;
		}

		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder holder; 
			if (convertView == null) { 
				convertView = mInflater.inflate(R.layout.imagelayout_2lines, null);
				holder = new ViewHolder();
				holder.text = (TextView) convertView.findViewById(R.id.managementObjectText);
				holder.subtext = (TextView) convertView.findViewById(R.id.managementObjectSubText);
				holder.icon = (ImageView) convertView.findViewById(R.id.managementObjectIcon);
				convertView.setTag(holder);
			}
			else {
				holder = (ViewHolder) convertView.getTag();
			}
			
			holder.text.setText(UserList.get(position).getFirstName());
			holder.subtext.setText(UserList.get(position).getLastName());
			holder.icon.setImageResource(R.drawable.user);
			
			return convertView;
		}
		
		static class ViewHolder { 
			TextView text;
			TextView subtext;
			ImageView icon;
		}

		@Override
		public Filter getFilter() {
			return null;
		}
	}
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.adobjectlist);
		Bundle extras = getIntent().getExtras();
    	
    	SearchText = (EditText) findViewById(R.id.SearchBox);    
    	SearchText.addTextChangedListener(filterTextWatcher);
    	
		objectListView = (ListView) findViewById(R.id.ObjectList);
		objectListView.setOnItemClickListener(Item_Click);
		adapter = new EfficientAdapter(this);
		ComputerName = extras.getString(&quot;COMPUTER_NAME&quot;);
			
		//Get User list from webservice
		ShowUsers();
	}

Here is The User class:

     public class User {
      private int UserId;
      private String FirstName;
      private String LastName;
    
    	public int getUserId() {
    		return UserId;
    	}
    	public void setUserId(int UserId) {
    		this.UserId = UserId;
    	}
    	public String getFirstName() {
    		return FirstName;
    	}
    	public void setFirstName(String FirstName) {
    		this.FirstName = FirstName;
    	}
    	public String getLastName() {
    		return LastName;
    	}
    	public void setLastName(String LastName) {
    		this.LastName = LastName;
    	}
    }



Filtering ListView with custom (object) adapter

I am trying to remove all the elements from my `RecyclerView` in my `onRestart` method so the items don&#39;t get loaded twice:

    @Override
    protected void onRestart() {
        super.onRestart();

        // first clear the recycler view so items are not populated twice
        for (int i = 0; i &lt; recyclerAdapter.getSize(); i++) {
            recyclerAdapter.delete(i);
        }

        // then reload the data
        PostCall doPostCall = new PostCall(); // my AsyncTask... 
        doPostCall.execute();
    }

But for some reason the `delete` method I created in the `adapter` is not functioning properly:

in RecyclerAdapter.java: 

    public void delete(int position){
        myList.remove(position);
        notifyItemRemoved(position);
    }

    public int getSize(){
        return myList.size();
    }

I think every other item in my list gets deleted instead of the entire list.

With a `listview` it was so easy and I simply called `adapter.clear()`.

Can someone please help me fix up the code?

I think I should be using `notifyItemRangeRemoved(...,...);` but I am not sure how. TIA

Remove all items from RecyclerView

So, I&#39;m watching this video http://www.youtube.com/watch?v=N6YdwzAvwOA and Romain Guy is showing how to make more efficient UI adapter code using the `getView()` method. Does this apply to CursorAdapters as well? I&#39;m currently using `bindView()` and `newView()` for my custom cursor adapters. Should I be using getView instead?

GetView Vs. BindView in a custom CursorAdapter?

I&#39;m doing an application for Android and something I need is that it shows a list of all files and directories in the SD Card and it has to be able to move through the different directories. I found [a good tutorial in anddev](http://www.anddev.org/viewtopic.php?t=67). I modified a few things so the application moves in the SD Card and not in Android root Directories but the rest is mostly the same.

This is my xml file for the activity:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;ListView xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    	android:id=&quot;@id/android:list&quot;  		
    	android:layout_width=&quot;fill_parent&quot;
      	android:layout_height=&quot;fill_parent&quot;&gt;
    	&lt;TextView 
        	android:layout_width=&quot;fill_parent&quot;
        	android:layout_height=&quot;wrap_content&quot; /&gt;
    &lt;/ListView&gt;

And this is the code for the Activity:

    import hackreatorz.cifrador.R;
    import java.io.File;
    import java.util.ArrayList;
    import android.app.ListActivity;
    import android.content.res.Configuration;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    import android.widget.Toast;
    
    public class ArchivosSD extends ListActivity {
    	
    	private ArrayList&lt;String&gt; directoryEntries = new ArrayList&lt;String&gt;();
    	private File currentDirectory = new File(&quot;/sdcard/&quot;);
    	
    	@Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            browseToSD();
        }
    	
    	@Override
    	public void onConfigurationChanged(Configuration newConfig) {
    		super.onConfigurationChanged(newConfig);
    	}
    
    	private void browseToSD() {
    		browseTo(new File(&quot;/sdcard/&quot;));
    	}
    	
    	private void upOneLevel() {
    		 if(this.currentDirectory.getParent() != null)
                 this.browseTo(this.currentDirectory.getParentFile());
    	}
    
    	private void browseTo(final File directory) {
    		if (directory.isDirectory()) {
    				this.currentDirectory = directory;
    				fill(directory.listFiles());
    		} else {
    				Toast.makeText(ArchivosSD.this, this.directoryEntries.get(this.getSelectedItemPosition()), Toast.LENGTH_SHORT).show();
    				}
    	}
    	
    	private void fill(File[] files) {
    		this.directoryEntries.clear();
    		this.directoryEntries.add(getString(R.string.current_dir));
    		if(this.currentDirectory.getParent() != null)
    			this.directoryEntries.add(getString(R.string.up_one_level));
    			int currentPathStringLength = (int) this.currentDirectory.getAbsoluteFile().length();
    			for (File file : files) {
    				this.directoryEntries.add(file.getAbsolutePath().substring(currentPathStringLength));			
    			}
    		setListAdapter(new ArrayAdapter&lt;String&gt;(this, R.layout.archivos_sd, this.directoryEntries));
    	}	
    		
    	@Override
    	protected void onListItemClick(ListView l, View v, int position, long id) {
    		int selectionRowID = (int) this.getSelectedItemPosition();
    		String selectedFileString = this.directoryEntries.get(selectionRowID);
    		if (selectedFileString.equals(&quot;.&quot;)) {
    			this.browseToSD();
    		} else if(selectedFileString.equals(&quot;..&quot;)) {
    			this.upOneLevel();
    		} else {
    			File clickedFile = null;
    			clickedFile = new File(this.currentDirectory.getAbsolutePath() + this.directoryEntries.get(selectionRowID));
    			if(clickedFile != null)
    				this.browseTo(clickedFile);
    			}
    	}
    }

I don&#39;t get any errors in Eclipse, but I get a Force Close when running the application on my phone  and when I look at Logcat I see the following:

&gt; *01-01 23:30:29.858: ERROR/AndroidRuntime(14911): FATAL EXCEPTION: main*
&gt; *01-01 23:30:29.858: ERROR/AndroidRuntime(14911): java.lang.UnsupportedOperationException: addView(View, LayoutParams)
&gt; is not supported in AdapterView*

I don&#39;t have a clue what to do, I&#39;ve looked up in Google and I didn&#39;t find anything and I did the same at stackoverflow. This is my first aplication in Java and for Android so I&#39;m a real n00b and if the answer was there, I didn&#39;t understand it so I would really appreciate if you could explain what I should do to fix this error and why.

Thanks for everything in advance.




Logcat error: &quot;addView(View, LayoutParams) is not supported in AdapterView&quot; in a ListView

What are containers/adapters? I have basic knowledge of C++ and its sub-topics like (class/templates/STL).

Can anyone please explain in layman&#39;s language and give me a practical example of the application of containers/adapters?

All Adapter Solutions on Gang of Coders

Total of 21 Adapter Solutions