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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.supportv7.widget;
import com.example.android.supportv7.Cheeses;
import com.example.android.supportv7.R;
import com.example.android.supportv7.widget.adapter.SimpleStringAdapter;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
/**
* A sample Activity to demonstrate capabilities of {@link GridLayoutManager}.
*/
public class GridLayoutManagerActivity extends BaseLayoutManagerActivity<GridLayoutManager> {
SimpleStringAdapter mAdapter;
@Override
protected GridLayoutManager createLayoutManager() {
GridLayoutManager lm = new GridLayoutManager(this, 3);
lm.setReverseLayout(true);
lm.setSpanSizeLookup(mSpanSizeLookup);
return lm;
}
GridLayoutManager.SpanSizeLookup mSpanSizeLookup = new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
String item = mAdapter.getValueAt(position);
return 1 + (Math.abs(item.hashCode()) % mLayoutManager.getSpanCount());
}
};
@Override
ConfigToggle[] createConfigToggles() {
return new ConfigToggle[]{
new ConfigToggle(this, R.string.checkbox_orientation) {
@Override
public boolean isChecked() {
return mLayoutManager.getOrientation() == LinearLayoutManager.HORIZONTAL;
}
@Override
public void onChange(boolean newValue) {
mLayoutManager.setOrientation(newValue ? LinearLayoutManager.HORIZONTAL
: LinearLayoutManager.VERTICAL);
}
},
new ConfigToggle(this, R.string.checkbox_reverse) {
@Override
public boolean isChecked() {
return mLayoutManager.getReverseLayout();
}
@Override
public void onChange(boolean newValue) {
mLayoutManager.setReverseLayout(newValue);
}
},
new ConfigToggle(this, R.string.checkbox_layout_dir) {
@Override
public boolean isChecked() {
return ViewCompat.getLayoutDirection(mRecyclerView) ==
ViewCompat.LAYOUT_DIRECTION_RTL;
}
@Override
public void onChange(boolean newValue) {
ViewCompat.setLayoutDirection(mRecyclerView, newValue ?
ViewCompat.LAYOUT_DIRECTION_RTL : ViewCompat.LAYOUT_DIRECTION_LTR);
}
},
new ConfigToggle(this, R.string.checkbox_stack_from_end) {
@Override
public boolean isChecked() {
return mLayoutManager.getStackFromEnd();
}
@Override
public void onChange(boolean newValue) {
mLayoutManager.setStackFromEnd(newValue);
}
}
};
}
@Override
protected void scrollToPositionWithOffset(boolean smooth, int position, int offset) {
if (smooth) {
super.scrollToPositionWithOffset(smooth, position, offset);
} else {
mLayoutManager.scrollToPositionWithOffset(position, offset);
}
}
protected RecyclerView.Adapter createAdapter() {
mAdapter = new SimpleStringAdapter(this, Cheeses.sCheeseStrings) {
@Override
public SimpleStringAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
final SimpleStringAdapter.ViewHolder vh = super
.onCreateViewHolder(parent, viewType);
vh.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final int pos = vh.getAdapterPosition();
if (pos == RecyclerView.NO_POSITION) {
return;
}
if (pos + 1 < getItemCount()) {
swap(pos, pos + 1);
}
}
});
return vh;
}
};
return mAdapter;
}
}
|
