1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
package com.wireguard.android;
import android.content.Context;
import android.databinding.DataBindingUtil;
import android.databinding.ObservableArrayMap;
import android.databinding.ObservableMap;
import android.databinding.ViewDataBinding;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import java.lang.ref.WeakReference;
/**
* A generic ListAdapter backed by an ObservableArrayMap.
*/
class ObservableArrayMapAdapter<K, V> extends BaseAdapter implements ListAdapter {
private final int layoutId;
private final LayoutInflater layoutInflater;
private ObservableArrayMap<K, V> map;
private final OnMapChangedCallback<K, V> callback = new OnMapChangedCallback<>(this);
ObservableArrayMapAdapter(final Context context, final int layoutId,
final ObservableArrayMap<K, V> map) {
super();
layoutInflater = LayoutInflater.from(context);
this.layoutId = layoutId;
setMap(map);
}
@Override
public int getCount() {
return map != null ? map.size() : 0;
}
@Override
public V getItem(final int position) {
return map != null ? map.valueAt(position) : null;
}
@Override
public long getItemId(final int position) {
return getItem(position) != null ? getItem(position).hashCode() : -1;
}
@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
ViewDataBinding binding = DataBindingUtil.getBinding(convertView);
if (binding == null)
binding = DataBindingUtil.inflate(layoutInflater, layoutId, parent, false);
binding.setVariable(BR.item, getItem(position));
binding.executePendingBindings();
return binding.getRoot();
}
@Override
public boolean hasStableIds() {
return true;
}
public void setMap(final ObservableArrayMap<K, V> newMap) {
if (map != null)
map.removeOnMapChangedCallback(callback);
map = newMap;
if (map != null) {
map.addOnMapChangedCallback(callback);
}
}
private static class OnMapChangedCallback<K, V>
extends ObservableMap.OnMapChangedCallback<ObservableMap<K, V>, K, V> {
private final WeakReference<ObservableArrayMapAdapter<K, V>> weakAdapter;
private OnMapChangedCallback(final ObservableArrayMapAdapter<K, V> adapter) {
super();
weakAdapter = new WeakReference<>(adapter);
}
@Override
public void onMapChanged(final ObservableMap<K, V> sender, final K key) {
final ObservableArrayMapAdapter<K, V> adapter = weakAdapter.get();
if (adapter != null)
adapter.notifyDataSetChanged();
else
sender.removeOnMapChangedCallback(this);
}
}
}
|
