具有动态条目的自定义ListPreference [英] Custom ListPreference with dynamic entries

问题描述

我在ListPreference中需要动态条目，所以我不能使用在线上有大量资料的XML设置的常规方法.到目前为止，您可以看到下面的设置.问题是，运行此命令时，我会看到带有标题和消息的对话框，但是即使我知道条目和值都不为空，也不会显示任何条目(我知道我的条目和值是相同的，但是如果不这样做，则会出现错误提供的条目)

I need dynamic entries in ListPreference so I can not use conventional way of XML setup of which there are tons of materials online. So far I have following setup as you can see bellow. Problem is that when I run this I see dialog with title and message but no entries are showed even though I know that entries and values are not empty (I know that my entries and values are same but I would get error if I didn't supplied entries)

my.preference.DynamicPreference
            android:title="@string/date_format"
            android:dialogMessage="@string/profile_info_date_format"
            android:entryValues="@array/date_format_values"
            android:entries="@array/date_format_values"

public class DynamicPreference extends ListPreference {
    private int index;

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

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

    @Override
    protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
        builder.setTitle(getTitle());
        builder.setMessage(getDialogMessage());
        builder.setSingleChoiceItems(entries(), -1, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

            }
        });
        super.onPrepareDialogBuilder(builder);
    }

    @Override
    public void setEntries(CharSequence[] sequence) {
        CharSequence[] entries = listObjects().toArray(new CharSequence[listObjects().size()]);
        super.setEntries(entries);
    }

    @Override
    public void setEntryValues(CharSequence[] sequence) {
        CharSequence[] values = getContext().getResources().getStringArray(R.string.date_format);
        super.setEntryValues(values);
    }
}

推荐答案

在这里android:dialogMessage是一个很好的起点，谢谢@MH.为发现它.波纹管是我最后的简单设置，希望有人能对它有所帮助

The android:dialogMessage was good starting point here, thank you @MH. for spotting it. Bellow is simple setup I ended with, I hope someone may find it helpful

<my.preference.DynamicPreference
        android:title="@string/local_time"
        android:key="profile_info_local_time"
        />

public class DynamicPreference extends ListPreference {


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

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

    @Override
    protected View onCreateDialogView() {
        ListView view = new ListView(getContext());
        view.setAdapter(adapter());
        setEntries(entries());
        setEntryValues(entryValues());
        setValueIndex(initializeIndex());
        return view;
    }

    private ListAdapter adapter() {
        return new ArrayAdapter(getContext(), android.R.layout.select_dialog_singlechoice);
    }

    private CharSequence[] entries() {
        //action to provide entry data in char sequence array for list
    }

    private CharSequence[] entryValues() {
        //action to provide value data for list
    }
}

这篇关于具有动态条目的自定义ListPreference的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！