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POUpdating data in custom data in custom listview (Android)
 

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  1. POUpdating data in custom data in custom listview (Android)
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    <p>I followed the following tutorial to create a listview that has both an image and text in it. [<a href="http://www.debugrelease.com/2013/06/24/android-listview-tutorial-with-images-and-text/" rel="nofollow">http://www.debugrelease.com/2013/06/24/android-listview-tutorial-with-images-and-text/</a></p> <p>It looks like this.. [<a href="http://i.stack.imgur.com/l7ukU.png" rel="nofollow">http://i.stack.imgur.com/l7ukU.png</a></p> <p>I modified it slighlty to contain only three items. What I would like to do is change the text in the listview based on data that I will be receiving over USB. How do I go about changing the data from within my main activity?</p> <p>Here is the code for my model for the list items...</p> <pre><code>public class Item { public int Id; public String IconFile; public String Name; public Item(int id, String iconFile, String name) { Id = id; IconFile = iconFile; Name = name; } } </code></pre> <p>Here is the code for my arraylist</p> <pre><code>public class Model extends Globals { public static ArrayList&lt;Item&gt; Items; public static void LoadModel() { Items = new ArrayList&lt;Item&gt;(); Items.add(new Item(1, "alarm.png", "Alarm")); Items.add(new Item(2, "calc.png", "Calculator")); Items.add(new Item(3, "play.png", "Play")); } public static Item GetbyId(int id) { for(Item item : Items) { if (item.Id == id) { return item; } } return null; } } </code></pre> <p>Here is the code for the custom adapter...</p> <pre><code>public class ItemAdapter extends ArrayAdapter&lt;String&gt; { private final Context context; private final String[] Ids; private final int rowResourceId; public ItemAdapter(Context context, int textViewResourceId, String[] objects) { super(context, textViewResourceId, objects); this.context = context; this.Ids = objects; this.rowResourceId = textViewResourceId; } @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View rowView = inflater.inflate(rowResourceId, parent, false); ImageView imageView = (ImageView) rowView.findViewById(R.id.imageView); TextView textView = (TextView) rowView.findViewById(R.id.textView); int id = Integer.parseInt(Ids[position]); String imageFile = Model.GetbyId(id).IconFile; textView.setText(Model.GetbyId(id).Name); // get input stream InputStream ims = null; try { ims = context.getAssets().open(imageFile); } catch (IOException e) { e.printStackTrace(); } // load image as Drawable Drawable d = Drawable.createFromStream(ims, null); // set image to ImageView imageView.setImageDrawable(d); return rowView; } </code></pre> <p>And lastly my main activity code...</p> <pre><code>public class MainActivity extends Globals { ListView listView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Model.LoadModel(); listView = (ListView) findViewById(R.id.listView); String[] ids = new String[Model.Items.size()]; for (int i= 0; i &lt; ids.length; i++) { ids[i] = Integer.toString(i+1); } ItemAdapter adapter = new ItemAdapter(this,R.layout.row, ids); listView.setAdapter(adapter); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_settings: Toast.makeText(this, "Exiting", Toast.LENGTH_SHORT) .show(); //finish(); break; default: break; } return true; } </code></pre>
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