1 /* 2 * Copyright (C) 2008 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.android.music; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.widget.Checkable; 22 import android.widget.RelativeLayout; 23 24 /** 25 * A special variation of RelativeLayout that can be used as a checkable object. 26 * This allows it to be used as the top-level view of a list view item, which 27 * also supports checking. Otherwise, it works identically to a RelativeLayout. 28 */ 29 public class CheckableRelativeLayout extends RelativeLayout implements Checkable { 30 private boolean mChecked; 31 32 private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked}; 33 CheckableRelativeLayout(Context context, AttributeSet attrs)34 public CheckableRelativeLayout(Context context, AttributeSet attrs) { 35 super(context, attrs); 36 } 37 38 @Override onCreateDrawableState(int extraSpace)39 protected int[] onCreateDrawableState(int extraSpace) { 40 final int[] drawableState = super.onCreateDrawableState(extraSpace + 1); 41 if (isChecked()) { 42 mergeDrawableStates(drawableState, CHECKED_STATE_SET); 43 } 44 return drawableState; 45 } 46 toggle()47 public void toggle() { 48 setChecked(!mChecked); 49 } 50 isChecked()51 public boolean isChecked() { 52 return mChecked; 53 } 54 setChecked(boolean checked)55 public void setChecked(boolean checked) { 56 if (mChecked != checked) { 57 mChecked = checked; 58 refreshDrawableState(); 59 } 60 } 61 } 62