How do I represent an Object Array in XML with data binding? - android-databinding

Question

With data binding, I am trying to connect my member variable Tile[] tiles which resides in Model model to the TextViews in my XML file. However, I am getting the following gradle error:
Error:(106, 33) Identifiers must have user defined types from the XML file. tiles is missing it
This is (part of) my XML:
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="(Tile[]) tiles"
type="com.myapp.Model" />
</data>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/tv0"
android:layout_width="100dp"
android:layout_height="100dp"
android:text='#{tiles[0].getValue == 0 ? "" : tiles[0].getValue}'
android:textSize='#{tiles[0].getValue < 100 ? "48sp" : tiles[0].getValue < 1000 ? "36sp" : "24sp"}'/>
<TextView
android:id="#+id/tv1"
android:layout_width="100dp"
android:layout_height="100dp"
android:text='#{tiles[1].getValue == 0 ? "" : tiles[1].getValue}'
android:textSize='#{tiles[1].getValue < 100 ? "48sp" : tiles[1].getValue < 1000 ? "36sp" : "24sp"}'/>
...
</RelativeLayout>
</layout>
This is (part of) my Model class:
class Model {
private Tile[] tiles = new Tile[16];
Model(Tile[] tiles) {
setTiles(tiles);
}
Tile[] getTiles(){ return tiles;}
void setTiles(Tile[] tiles) { System.arraycopy(tiles, 0, this.tiles, 0, tiles.length); }
int getValue(int index) { return tiles[index].getValue(); }
void setValue(int index, int value) { tiles[index].setValue(value); }
int getId(int index) { return tiles[index].getId(); }
void setId(int index, int id) { tiles[index].setId(id);}
}
And this is (part of) my Tile class:
class Tile {
private int value;
private int id;
Tile(int id, int value) {
this.id = id;
this.value = value;
}
int getValue() {
return value;
}
void setValue(int value) {
this.value = value;
}
int getId() {
return id;
}
void setId(int id) {
this.id = id;
}
}
Most likely, this line is wrong: type="com.myapp.Model", since the type of my tiles variable is not Model, but the compiler/gradle does not let me put com.myapp.Tile nor com.myapp.Tile[] nor com.myapp.Model.Tile[]. How do I correctly declare my Tile[] variable?

Answer 1

Try with this in your xml :
<variable
name="tiles"
type="com.<your package>.Tile[]"/> //it might show you an error in xml but you can ignore it.
and set its value from activity/fragment/viewmodel
binding.setTiles(<your array>);
Make sure your Tile class and its variable are public.
public class Tile {
public int value;
public int id;
.
.
.
}