Please note that the contents of this offline web site may be out of date. To access the most recent documentation visit the online version .
Note that links that point to online resources are green in color and will open in a new window.
We would love it if you could give us feedback about this material by filling this form (You have to be online to fill it)
CustomChoiceList / src / com.example.android.customchoicelist /

CheckableLinearLayout.java

       
        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
       
       
        }