如何自定义列表首选项单选按钮

How to customize list preference radio button(如何自定义列表首选项单选按钮)

问题描述

我已自定义应用程序中的所有单选按钮，但 listPreference 中的单选按钮未自定义.

I have customized all the radioButtons in my application but the radioButtons in the listPreference does not get customized.

我使用了这个名为 btn_radio.xml 的 xml

I have used this xml named btn_radio.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:state_window_focused="false"
      android:drawable="@drawable/radio_selected" />
<item android:state_checked="false" android:state_window_focused="false"
      android:drawable="@drawable/radio_unselected" />

<item android:state_checked="true" android:state_pressed="true"
      android:drawable="@drawable/radio_selected" />
<item android:state_checked="false" android:state_pressed="true"
      android:drawable="@drawable/radio_unselected" />

<item android:state_checked="true" android:state_focused="true"
      android:drawable="@drawable/radio_selected" />
<item android:state_checked="false" android:state_focused="true"
      android:drawable="@drawable/radio_unselected" />

<item android:state_checked="false" android:drawable="@drawable/radio_unselected" />
<item android:state_checked="true" android:drawable="@drawable/radio_selected" />
</selector>

这是扩展了 android 自定义单选按钮的 customRadioButton

This is the customRadioButton which extends the android custom radio button

<style name="CustomRadioButton"    Parent="@android:style/Widget.CompoundButton.RadioButton">
    <item name="android:button">@drawable/btn_radio</item>
</style>

在我的应用程序的主题中，我做了这些更改

in the theme of my application I have done this changes

<item name="android:radioButtonStyle">@style/CustomRadioButton</item>
    <item name="android:listChoiceIndicatorSingle">@style/CustomRadioButton</item>

此更改自定义了我的应用程序中的所有单选按钮，但 ListPreference 中的单选按钮除外

推荐答案

无法直接从 XML 设置 ListPreference 样式.问题是 ListPreference(通过 DialogPreference)调用 AlertDialog.Builder(Context) 来构建它的 Dialog，而不是比 AlertDialog.Builder(Context context, int themeResourceId).虽然后者允许提供主题，但前者不允许，导致它回退到默认的 Android 主题.

Styling the ListPreference from XML is not directly possible. The problem is that ListPreference (through DialogPreference) calls AlertDialog.Builder(Context) to build its Dialog, rather than AlertDialog.Builder(Context context, int themeResourceId). While the latter allows for providing a theme, the former does not, causing it to fall back to a default Android theme.

对于一个项目，我需要一个带有自定义标题颜色、自定义单选按钮样式和自定义 ListView 选择器(基本上是不同颜色的 Holo)的 ListPreference.我通过扩展 ListPreference 并覆盖 onPrepareDialogBu​​ilder(Builder) 和 OnCreateDialogView() 解决了这个问题，因此我可以使用带有简单 ArrayAdapter 的自定义 ListView，而不是比 Dialog 的内置 ListView (不支持样式).我还必须重写 onDialogClosed() 以便为首选项设置正确的值.

For a project, I needed a ListPreference with a custom title-color, a custom radiobutton-style and a custom ListView-selector (basically, Holo in a different color). I solved this by extending ListPreference and overriding onPrepareDialogBuilder(Builder) and OnCreateDialogView() so I could use a custom ListView with a simple ArrayAdapter, rather than Dialog's built-in ListView (which doesn't have support for styling). I also had to override onDialogClosed() in order to set the right value to the preference.

为了使用它，您只需将您的preferences.xml rom ListPreference 中的首选项的类名替换为 com.your.packagename.ThemedListPreference.除此之外，实现与 ListPreference 相同.

In order to use it, all you have to do is replace the classname of the preference in your preferences.xml rom ListPreference to com.your.packagename.ThemedListPreference. Other than that, the implementation is identical to ListPreference.

public class ThemedListPreference extends ListPreference implements OnItemClickListener {

    public static final String TAG = "ThemedListPreference";

    private int mClickedDialogEntryIndex;

    private CharSequence mDialogTitle;

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

    public ThemedListPreference(Context context) {
        super(context);
    }

    @Override
    protected View onCreateDialogView() {
        // inflate custom layout with custom title & listview
        View view = View.inflate(getContext(), R.layout.dialog_settings_updatetime, null);

        mDialogTitle = getDialogTitle();
        if(mDialogTitle == null) mDialogTitle = getTitle();
        ((TextView) view.findViewById(R.id.dialog_title)).setText(mDialogTitle);

        ListView list = (ListView) view.findViewById(android.R.id.list);
        // note the layout we're providing for the ListView entries
        ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(
                getContext(), R.layout.btn_radio,
                getEntries());

        list.setAdapter(adapter);
        list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        list.setItemChecked(findIndexOfValue(getValue()), true);
        list.setOnItemClickListener(this);

        return view;
    }

    @Override
    protected void onPrepareDialogBuilder(Builder builder) {
        // adapted from ListPreference
        if (getEntries() == null || getEntryValues() == null) {
            // throws exception
            super.onPrepareDialogBuilder(builder);
            return;
        }

        mClickedDialogEntryIndex = findIndexOfValue(getValue());

        // .setTitle(null) to prevent default (blue)
        // title+divider from showing up
        builder.setTitle(null);

        builder.setPositiveButton(null, null);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        mClickedDialogEntryIndex = position;
        ThemedListPreference.this.onClick(getDialog(), DialogInterface.BUTTON_POSITIVE);
        getDialog().dismiss();
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
            // adapted from ListPreference
        super.onDialogClosed(positiveResult);

        if (positiveResult && mClickedDialogEntryIndex >= 0
                && getEntryValues() != null) {
            String value = getEntryValues()[mClickedDialogEntryIndex]
                    .toString();
            if (callChangeListener(value)) {
                setValue(value);
            }
        }
    }
}

对于我的 ListView 项目，我使用了下面的布局.请注意，drawable/btn_radio_holo_light 是一个 XML 可绘制对象，就像您的 android-sdk/platforms/android-x/data/res/drawable 文件夹中的那样，只是引用了不同的可绘制对象.

For my ListView items I used the layout below. Note that drawable/btn_radio_holo_light is an XML-drawable like the one in your android-sdk/platforms/android-x/data/res/drawable folder, only with references to different drawables.

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:checkMark="@drawable/btn_radio_holo_light"
    android:gravity="center_vertical"
    android:minHeight="@dimen/list_item_minheight"
    android:paddingLeft="@dimen/list_item_paddingLeft"
    android:paddingRight="@dimen/list_item_paddingLeft" />

对于我的对话框布局 (onCreateDialogView())，我使用了以下内容:

For my Dialog layout (onCreateDialogView()), I used the following:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/dialog_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:textColor="@color/title_color"
        android:textSize="22sp" />

    <View
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/divider_color" />

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:listSelector="@drawable/list_selector" />

</LinearLayout>

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