CheckableLinearLayout.java

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/*
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 * Copyright 2013 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.customchoicelist;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.View;
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import android.widget.Checkable;
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import android.widget.LinearLayout;
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/**
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 * This is a simple wrapper for {@link android.widget.LinearLayout} that implements the {@link android.widget.Checkable}
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 * interface by keeping an internal 'checked' state flag.
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 * <p>
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 * This can be used as the root view for a custom list item layout for
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 * {@link android.widget.AbsListView} elements with a
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 * {@link android.widget.AbsListView#setChoiceMode(int) choiceMode} set.
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 */
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public class CheckableLinearLayout extends LinearLayout implements Checkable {
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    private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
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    private boolean mChecked = false;
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    public CheckableLinearLayout(Context context, AttributeSet attrs) {
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        super(context, attrs);
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    }
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    public boolean isChecked() {
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        return mChecked;
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    }
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    public void setChecked(boolean b) {
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        if (b != mChecked) {
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            mChecked = b;
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            refreshDrawableState();
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        }
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    }
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    public void toggle() {
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        setChecked(!mChecked);
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    }
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    @Override
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    public int[] onCreateDrawableState(int extraSpace) {
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        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
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        if (isChecked()) {
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            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
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        }
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        return drawableState;
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    }
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}