我按照以下教程创建了一个包含图像和文本的列表视图。[ http://www.debugrelease.com/2013/06/24/android-listview-tutorial-with-images-and-text/
它看起来像这样.. [ http://i.stack.imgur.com/l7ukU.png
我稍微修改了一下，只包含三个项目。我想做的是根据我将通过 USB 接收的数据更改列表视图中的文本。如何从我的主要活动中更改数据？
这是我的列表项模型的代码...
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;
}
}
这是我的数组列表的代码
public class Model extends Globals
{
public static ArrayList<Item> Items;
public static void LoadModel()
{
Items = new ArrayList<Item>();
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;
}
}
这是自定义适配器的代码...
public class ItemAdapter extends ArrayAdapter<String> {
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;
}
最后是我的主要活动代码......
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 < 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;
}