Question

我几个小时以来一直在努力解决这个问题，我找不到解决办法，希望有人可以帮助我我有一个带有自定义适配器的ListView，它扩展了BaseAdapter，列表的每个元素都扩展了一个只包含TextView的LinearLayout。我基本上是从How to add a custom button state开始的这是list元素的list_item.xml布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res/com.example.mypackage"
    android:id="@+id/newItem"
    app:state_playing="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/item_selector"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/textview"
        style="@style/Text_View_Style_White"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:duplicateParentState="true"
        android:ellipsize="marquee"
        android:focusableInTouchMode="true"
        android:marqueeRepeatLimit="marquee_forever"
        android:padding="3dp"
        android:scrollHorizontally="true"
        android:singleLine="true"
        android:textColor="@drawable/item_text_selector" /> 
</LinearLayout>

以下是BaseAdapter的相关代码：

  class AlbumListAdapter extends BaseAdapter implements Checkable {

    private Context mContext;

    public AlbumListAdapter(Context context) {
        mContext = context;
    }

    @Override
    public int getCount() {

        return listSize; // is a variable
     }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        AlbumViewHolder albumHolder = null;
        if (convertView == null) {
            // Inflate the layout
            LayoutInflater li = getActivity().getLayoutInflater();
            convertView = li.inflate(R.layout.list_item, null);
            albumHolder = new AlbumViewHolder(mContext, null);
            albumHolder.albumTitle = (TextView) convertView
                    .findViewById(R.id.textview);

            convertView.setTag(albumHolder);
        } else {
            albumHolder = (AlbumViewHolder) convertView.getTag();
        }

        albumHolder.albumTitle.setText("Some text in the TextView");
        albumHolder.albumTitle.setSelected(true);

        if (myBooleanCondition) 
        {
            albumHolder.setPlaying(true);
            albumHolder.refreshDrawableState();

            for (int i = 0; i < albumHolder.getDrawableState().length; i++) {
                if (albumHolder.getDrawableState()[i] != 0)
                    System.out.println(TAG + " State i = "
                    + i + " -> " + getResources().getResourceEntryName(albumHolder.getDrawableState()[i]));
            }
        }

        return convertView;
    }
}

这里是扩展LinearLayout的列表元素类：

static class AlbumViewHolder extends LinearLayout {

        private static final int[] STATE_PLAYING_SET = { R.attr.state_playing };
        private boolean mIsPlaying = false;
        TextView albumTitle;

        public AlbumViewHolder(Context context, AttributeSet attrs) {
            super(context, attrs);
        }

        public void setPlaying(boolean isPlaying) {
            mIsPlaying = isPlaying;
        }

        @Override
        protected int[] onCreateDrawableState(int extraSpace) {
            final int[] drawableState = super
                    .onCreateDrawableState(extraSpace + 1);
            if (mIsPlaying) {
                System.out.println(TAG
                        + " - onCreateDrawableState() -> mIsPlaying = "
                        + mIsPlaying);
                mergeDrawableStates(drawableState, STATE_PLAYING_SET);
            }
            return drawableState;
        }
    }

这是attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="music">
        <attr name="state_playing" format="boolean" />
        <attr name="playing" format="boolean" />
    </declare-styleable>
</resources>

这里有2个选择器尝试使用选择器状态state_playing，一个用于每个元素的LinearLayout背景（item_selector.xml）：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res/com.example.mypackage">

    <item android:drawable="@color/blue_fluo3" app:state_playing="true"/>
    <item android:drawable="@color/orange_fluo" android:state_pressed="true" app:state_playing="false"/>
    <item android:drawable="@color/orange_fluo" android:state_activated="true" app:state_playing="false"/>
    <item android:drawable="@android:color/transparent" app:state_playing="false"/>

</selector>

和一个用于TextView的textColor（item_text_selector.xml）：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res/com.example.mypackage">

    <item app:state_playing="true" android:color="@color/orange_fluo"/>
    <item android:state_pressed="true" app:state_playing="false" android:color="@color/black"/>
    <item android:state_activated="true" app:state_playing="false" android:color="@color/black"/>
    <item app:state_playing="false" android:color="@android:color/white"/>

</selector>

两者的结果相同：state_playing似乎有效，但只有状态“false”，因为如果我在选择器状态列表的开头添加一行，<item app:state_playing="false" android:color="@color/yellow"/>用于文本选择器，{ {1}}对于背景选择器，一切都按预期工作，我可以看到红色背景的LinearLayout和带黄色文本的文本！
我真的不知道该尝试什么...（即使我默认将属性设置为xml布局中的对象（<item android:drawable="@color/red" app:state_playing="false"/>），它也不起作用！

非常感谢任何帮助，提示或经验分享！

Answer 1

我看起来没问题，但我建议在容器布局中设置duplicateParentState，如下所示。我有一个模糊的记忆，就是我自己也有问题......

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res/com.example.mypackage"
android:id="@+id/newItem"
android:duplicateParentState="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/item_selector"
android:orientation="horizontal" >

<TextView
    android:id="@+id/textview"
    style="@style/Text_View_Style_White"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:duplicateParentState="true"
    android:ellipsize="marquee"
    android:focusableInTouchMode="true"
    android:marqueeRepeatLimit="marquee_forever"
    android:padding="3dp"
    android:scrollHorizontally="true"
    android:singleLine="true"
    android:textColor="@drawable/item_text_selector" />

Android：自定义选择器状态永远不会“真实”

1 个答案: