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POAndroid AlertDialog wait for result in calling activity
 

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    <p>I am trying to use an <code>AlertDialog</code> in my app to select the quantity of an item. The problem is that the activity that calls the <code>AlertDialog</code> doesn't wait for it to update the item before it adds it to the SQLite Database and change intents.</p> <p>At the moment, the <code>QuantitySelector</code> (<code>AlertDialog</code>) appears, then disappears straight away and changes the <code>MealActivity</code> class (which is just a <code>ListView</code> that reads from the database) through the intent change with an update to the database with quantity 0.</p> <p>I need the <code>Activity</code> to wait for the <code>AlertDialog</code> to close before it updates the database.</p> <p>What would be the correct way of implementing this?</p> <p>Here is some code for you:</p> <p><code>QuantitySelector</code> (which runs the alertdialog):</p> <pre><code>public class QuantitySelector{ protected static final int RESULT_OK = 0; private Context _context; private DatabaseHandler db; private HashMap&lt;String, Double&gt; measures; private Item item; private View v; private EditText quan; private NumberPicker pick; private int value; private Quantity quantity; /** * Function calls the quantity selector AlertDialog * @param _c: The application context * @param item: The item to be added to consumption * @return The quantity that is consumed */ public void select(Context _c, Item item, Quantity quantity){ this._context = _c; this.item = item; this.quantity = quantity; db = new DatabaseHandler(_context); //Get the measures to display createData(); //Set up the custom view LayoutInflater inflater = LayoutInflater.from(_context); v = inflater.inflate(R.layout.quantity_selector, null); //Set up the input fields quan = (EditText) v.findViewById(R.id.quantityNumber); pick = (NumberPicker) v.findViewById(R.id.numberPicker1); //Set up the custom measures into pick pick.setMaxValue(measures.size()-1); pick.setDisplayedValues(measures.keySet().toArray(new String[0])); //Start the alert dialog runDialog(); } public void createData(){ measures = new HashMap&lt;String, Double&gt;(); //Get the measurements from the database if(item!=null){ measures.putAll(db.getMeasures(item)); } //Add grams as the default measurement if(!measures.keySet().contains("grams")){ //Add grams as a standard measure measures.put("grams", 1.0); } } public void runDialog(){ AlertDialog dialog = new AlertDialog.Builder(_context).setTitle("Select Quantity") .setView(v) .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { //Change the consumption to the new quantity if(!quan.getText().toString().matches("")){ value = Integer.parseInt(quan.getText().toString()); //Check if conversion from other units is needed String s[] = pick.getDisplayedValues(); String a = s[pick.getValue()]; //Convert the chosen measure back to grams if(!a.equals("grams")){ for(String m : measures.keySet()){ if(m==a){ value = (int) (value * measures.get(m)); } } } } quantity.setQuantity(value); dialog.dismiss(); } }) .setNegativeButton("Cancel", null).create(); dialog.show(); } } </code></pre> <p>The method from favouritesAdapter (which calls the alertdialog):</p> <pre><code>add.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { QuantitySelector q = new QuantitySelector(); Quantity quan = new Quantity(); q.select(_context, db.getItem(p.getID()), quan); db.addConsumption(p.getID(), p.getFavouriteShortName(), quan.getQuantity(), "FAVOURITE"); Intent intent = new Intent(_context,MealActivity.class); _context.startActivity(intent); } }); </code></pre> <p>All help is appreciated :)</p>
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