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POComplex example of ListView getItemViewType()
 

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  1. POComplex example of ListView getItemViewType()
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    <p>I have a <code>ListView</code> that is complex in that there are possible scenarios for 4 view types e.g. <code>{ book, movie, music cd, concert }</code></p> <p>Currently, to decide on what object to inflate etc, I get the item that relates to the list row. I will then do a <code>switch()</code> on the type field of the object.</p> <p>This has left me with a lot of code and heavy lifting in the <code>getView()</code>.</p> <p>Am I correct in saying that <code>getItemViewType()</code> is used to return the correct view type for the current item?</p> <p>Where would I find an example of a <code>ListAdapter</code> that uses this approach? Note: this is in an attempt to smooth out my <code>ListView</code> that is quite sluggish now.</p> <p>Thanks</p> <p><strong>EDIT: My Adapter</strong></p> <pre><code>public class MyListAdapter extends BaseAdapter implements ListAdapter { private Context ctx; private int layoutResourceId; private ArrayList&lt;ItemType&gt; items; public MyListAdapter(Context context, ArrayList&lt;ItemType&gt; data) { this.layoutResourceId = R.layout.timeline_item_row; this.ctx = context; this.setitems(data); } @Override public View getView(int position, View convertView, ViewGroup parent) { View row = convertView; TimelineHolder holder = null; ItemType transaction = getitems().get(position); if (row == null) { LayoutInflater inflater = ((Activity) ctx).getLayoutInflater(); row = inflater.inflate(layoutResourceId, parent, false); holder = new TimelineHolder(); holder.imgActivityIcon = (ImageView)row.findViewById(R.id.imgActivityImageIcon); holder.imgActivityLabel = (ImageView)row.findViewById(R.id.imgActivityImageLabel); holder.lblMerchantName = (TextView)row.findViewById(R.id.lblMerchantName); holder.lblLocation = (TextView)row.findViewById(R.id.lblLocation); holder.lblActivityType = (TextView)row.findViewById(R.id.lblActivityType); holder.lblActivityLabelUpper = (TextView)row.findViewById(R.id.lblActivityTypeLabel); holder.lblTimeSinceActivity = (TextView)row.findViewById(R.id.lblTimeSinceActivity); holder.lblActivityAmount = (TextView)row.findViewById(R.id.lblActivityAmount); row.setTag(holder); } else { holder = (TimelineHolder) row.getTag(); } // Get/Populate common values here String address = ""; Date hostTime = Helper.parse8601UTC(transaction.getCurrentHostTime()); Date transactionTime = Helper.parse8601UTC(transaction.getHostTransactionTime()); String merchantName = transaction.getMerchant().getName(); holder.lblMerchantName.setText(merchantName); holder.lblLocation.setText(address); holder.lblTimeSinceActivity.setText(Helper.timeSince(transactionTime, hostTime)); holder.lblActivityAmount.setText(Helper.doubleToCurrency(transaction.getAmount(), transaction.getCurrency())); switch (transaction.getTransactionTypeId()) { case TYPE_ONE: holder.imgActivityIcon.setImageResource(R.drawable.redemmedicon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Loyalty_Earned); holder.lblActivityLabelUpper.setText(R.string.EARNED); holder.lblActivityAmount.setText(transaction.getResponsePoints() + " pts"); break; case TYPE_TWO: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Prepay_Redeem_Refund); holder.lblActivityLabelUpper.setText(R.string.REDEEMED); break; case TYPE_THREE: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityLabelUpper.setText(R.string.REFUND); holder.lblActivityType.setText(R.string.Prepay_Purchase_Refund); break; case TYPE_FOUR: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityLabelUpper.setText(R.string.REFUND); holder.lblActivityType.setText(R.string.Prepay_Deposit_Refund); break; case TYPE_FIVE: holder.imgActivityIcon.setImageResource(R.drawable.reward_earned_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Reward_Redeemed); holder.lblActivityLabelUpper.setText(R.string.REDEEMED); holder.lblActivityAmount.setText(""); break; case TYPE_SIX: holder.imgActivityIcon .setImageResource(R.drawable.reward_earned_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.redeemed_flag); holder.lblActivityType.setText(R.string.Points_Redeemed); holder.lblActivityLabelUpper.setText(R.string.REDEEMED); holder.lblActivityAmount.setText(transaction.getResponsePoints() + " pts"); break; case TYPE_SEVEN: holder.imgActivityIcon.setImageResource(R.drawable.stamp_2x); holder.imgActivityLabel.setImageResource(R.drawable.redeemed_flag); holder.lblActivityType.setText(R.string.Checked_In); holder.lblActivityLabelUpper.setText(R.string.CHECK_IN); holder.lblActivityAmount.setText(""); break; case TYPE_EIGHT: holder.imgActivityIcon.setImageResource(R.drawable.shared_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.redeemed_flag); holder.lblActivityType.setText(R.string.Shared_Coupon); holder.lblActivityLabelUpper.setText(R.string.SHARED); holder.lblActivityAmount.setText(""); break; case TYPE_NINE: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Prepay_Deposit); holder.lblActivityLabelUpper.setText(R.string.DEPOSIT); break; case TYPE_TEN: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.redeemed_flag); holder.lblActivityType.setText(R.string.Prepay_Purchase); holder.lblActivityLabelUpper.setText(R.string.PURCHASE); break; case TYPE_ELEVEN: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Prepay_Redeemed); holder.lblActivityLabelUpper.setText(R.string.REDEEMED); break; case TYPE_TWELVE: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Refund); holder.lblActivityLabelUpper.setText(R.string.REFUND); holder.lblActivityAmount.setText(""); break; case TYPE_THIRTEEN: holder.imgActivityIcon.setImageResource(R.drawable.prepay_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.reversal); holder.lblActivityLabelUpper.setText(R.string.REVERSAL); holder.lblActivityAmount.setText(""); break; case TYPE_FOURTEEN: holder.imgActivityIcon.setImageResource(R.drawable.unlocked_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Check_In_Reward_Unlocked); holder.lblActivityLabelUpper.setText(R.string.UNLOCKED); holder.lblActivityAmount.setText(""); break; case TYPE_FIFTEEN: holder.imgActivityIcon.setImageResource(R.drawable.reward_earned_icon_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(R.string.Coupon_Received); holder.lblActivityLabelUpper.setText(R.string.RECEIVED); holder.lblActivityAmount.setText(""); break; default: holder.imgActivityIcon.setImageResource(R.drawable.stamp_2x); holder.imgActivityLabel.setImageResource(R.drawable.earned_flag); holder.lblActivityType.setText(""); holder.lblActivityLabelUpper.setText(""); holder.lblActivityAmount.setText(""); break; } return row; } @Override public int getCount() { return getitems() == null ? 0 : getitems().size(); } @Override public Object getItem(int position) { return getitems() == null ? null : getitems().get( position); } @Override public long getItemId(int position) { return layoutResourceId; } public void addItem(ItemType item, boolean addFirst) { if (addFirst) { getitems().add(0, item); } else { getitems().add(item); } notifyDataSetChanged(); } public ArrayList&lt;ItemType&gt; getitems() { return items; } public void setitems(ArrayList&lt;ItemType&gt; items) { this.items = items; } public int getFirstTransactionId() { int result = 0; if (items != null &amp;&amp; !items.isEmpty()) { ItemType txn = items.get(0); result = txn.getId(); } return result; } public int getLastTransactionId() { int result = 0; if (items != null &amp;&amp; !items.isEmpty()) { ItemType txn = items.get(items.size() - 1); result = txn.getId(); } return result; } @Override public int getViewTypeCount() { return 1; } @Override public int getItemViewType(int position) { return 0; } } </code></pre>
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      1. POComplex example of ListView getItemViewType()
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