1 /*
2  * Copyright 2013 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.example.android.customchoicelist;
18 
19 import android.content.Context;
20 import android.util.AttributeSet;
21 import android.util.Log;
22 import android.view.View;
23 import android.widget.Checkable;
24 import android.widget.LinearLayout;
25 
26 /**
27  * This is a simple wrapper for {@link android.widget.LinearLayout} that implements the {@link android.widget.Checkable}
28  * interface by keeping an internal 'checked' state flag.
29  * <p>
30  * This can be used as the root view for a custom list item layout for
31  * {@link android.widget.AbsListView} elements with a
32  * {@link android.widget.AbsListView#setChoiceMode(int) choiceMode} set.
33  */
34 public class CheckableLinearLayout extends LinearLayout implements Checkable {
35     private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
36 
37     private boolean mChecked = false;
38 
CheckableLinearLayout(Context context, AttributeSet attrs)39     public CheckableLinearLayout(Context context, AttributeSet attrs) {
40         super(context, attrs);
41     }
42 
isChecked()43     public boolean isChecked() {
44         return mChecked;
45     }
46 
setChecked(boolean b)47     public void setChecked(boolean b) {
48         if (b != mChecked) {
49             mChecked = b;
50             refreshDrawableState();
51         }
52     }
53 
toggle()54     public void toggle() {
55         setChecked(!mChecked);
56     }
57 
58     @Override
onCreateDrawableState(int extraSpace)59     public int[] onCreateDrawableState(int extraSpace) {
60         final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
61         if (isChecked()) {
62             mergeDrawableStates(drawableState, CHECKED_STATE_SET);
63         }
64         return drawableState;
65     }
66 }
67