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 39 public CheckableLinearLayout(Context context, AttributeSet attrs) { 40 super(context, attrs); 41 } 42 43 public boolean isChecked() { 44 return mChecked; 45 } 46 47 public void setChecked(boolean b) { 48 if (b != mChecked) { 49 mChecked = b; 50 refreshDrawableState(); 51 } 52 } 53 54 public void toggle() { 55 setChecked(!mChecked); 56 } 57 58 @Override 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
