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POunable to remove items from custom BaseAdapter on onListItemClick()
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copied!<p>I have a custom <code>BaseAdapter</code> which contains key-value pairs. In my <code>ListView</code>, when I short click on an item in the list I would like to remove it from the list. My problem is I do not know how to execute <code>notifyDataSetChanged</code> - see <code>onListItemClick</code> below. </p> <p>I have a constructor in <code>MyCustomAdapter</code> which is causing the pain. </p> <p>Below code is two classes. </p> <p><strong>Class 1</strong></p> <p><code>Dynamiclists extends ListActivity</code></p> <p><strong>Class 2</strong></p> <p><code>MyCustomAdapter extends BaseAdapter</code></p> <p>In class 1, I would like to remove from the <code>HashMap</code> map at postion indicated by <code>onListItemClick</code> and then update class 2.</p> <pre><code>package telephone.org; import java.util.HashMap; import java.util.Set; import java.util.Map.Entry; import telephone.org.MyService.LocalBinder; import android.app.ActivityManager; import android.app.ListActivity; import android.app.ActivityManager.RunningServiceInfo; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.IBinder; import android.provider.ContactsContract; import android.provider.ContactsContract.PhoneLookup; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import android.widget.AdapterView.OnItemLongClickListener; //class 1 public class DynamicLists extends ListActivity { MyService mService; boolean mBound = false; //class 2 /////////////////////////////////// public class MyCustomAdapter extends BaseAdapter { public HashMap<String, Integer> mData = new HashMap<String,Integer>(); private String[] mKeys; //constructor public MyCustomAdapter(DynamicLists dynamicLists, int row, HashMap<String, Integer> map){ mData = map; mKeys = mData.keySet().toArray(new String[map.size()]); Log.d(TAG, "INSIDE ADAPTER constructor HELLO WORLD " + map.entrySet()); } public MyCustomAdapter(MyService mService, int row, Object map) { // TODO Auto-generated constructor stub } @Override public View getView(int position, View convertView, ViewGroup parent) { //TODO Auto-generated method stub Log.d(TAG, "inside getview "); View row=convertView; if (row==null){ LayoutInflater inflater=getLayoutInflater(); row=inflater.inflate(R.layout.row, null); } TextView label =(TextView)row.findViewById(R.id.blocked); label.setText(mKeys[position] + " " + getItem(position).toString()); //key + value return row; } @Override public int getCount() { // TODO Auto-generated method stub return mData.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub Log.d(TAG, "inside getitem " + mData.get(mKeys[position])); return mData.get(mKeys[position]); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } } //end of class 2 //////////////////////// private static final String TAG = "DynamicList"; //class 1 public static HashMap<String, Integer> map = new HashMap<String, Integer>(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { //TODO Auto-generated method stub //remove entries from hashmap map String selection = l.getItemAtPosition(position).toString(); String[] tkeys; tkeys = map.keySet().toArray(new String[map.size()]); Integer toremove = map.get(tkeys[position]); Toast.makeText(this, "The value is" + map.get(tkeys[position]), Toast.LENGTH_LONG).show(); map.remove(toremove); //how to notify MyCustomAdapter of changes //end of remove entries from hashmap map } @Override public void onStart() { super.onStart(); isMyServiceRunning(); } public void onStop() { super.onStop(); // Unbind from the service if (mBound) { unbindService(mConnection); mBound = false; } } private boolean isMyServiceRunning() { ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE); for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) { if ("telephone.org.MyService".equals(service.service.getClassName())) { Toast.makeText(getApplicationContext(),"SERVICE IS RUNNING", Toast.LENGTH_LONG).show(); Intent intent = new Intent(this, MyService.class); bindService(intent, mConnection, Context.BIND_AUTO_CREATE); //SEE INTERACT WITH SERVICE BELOW return true; } } Toast.makeText(getApplicationContext(),"SERVICE IS STOPPED AND IS NOT RUNNING", Toast.LENGTH_LONG).show(); return false; } //INTERACT WITH SERVICE /** Defines callbacks for service binding, passed to bindService() */ private ServiceConnection mConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName className, IBinder service) { // We've bound to LocalService, cast the IBinder and get LocalService instance LocalBinder binder = (LocalBinder) service; mService = binder.getService(); mBound = true; Set<Entry<String, Integer>> whatsup = mService.getNumbers(); Toast.makeText(getApplicationContext(),"NUMBER INTERACTION IS" + whatsup, Toast.LENGTH_LONG).show(); Log.d(TAG, "ELEMENTS from service are:" + whatsup); Toast.makeText(getApplicationContext(),"NUMBER OF ENTRIES IS" + whatsup.size(), Toast.LENGTH_LONG).show(); //convert SET BACK TO HASHMAP for (Entry<String,Integer> entry : whatsup) { String name = null; String[] projection = new String[] { ContactsContract.PhoneLookup.DISPLAY_NAME}; Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(entry.getKey())); Cursor cursor = getContentResolver().query(uri, projection, null, null, null); if (cursor.moveToFirst()) { name = cursor.getString(cursor.getColumnIndex(ContactsContract.PhoneLookup.DISPLAY_NAME)); } Toast.makeText(getApplicationContext(),"RESOLVED NAME IS " + name, Toast.LENGTH_LONG).show(); projection = null; map.put(name,entry.getValue()); } setListAdapter(new MyCustomAdapter(DynamicLists.this, R.layout.row, map)); } //end CONVERT SET BACK TO HASHMAP @Override public void onServiceDisconnected(ComponentName arg0) { mBound = false; } }; //END INTERACTION WITH SERVICE } //end of class 1 </code></pre>

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