在android中，当我点击ListPreference时，如何设置对话框中项目的字体大小？

Question

我在首选项屏幕中有一个列表首选项控件，我希望在列表首选项对话框中更改项目的字体大小，我尝试在列表首选项中添加样式，但似乎不起作用，我该怎么办？谢谢！

顺便说一句，我已经阅读了listPreference？中的文章自定义行？，我认为这太复杂了，我只需要更改ListPreference对话框中列出的项目的字体大小。

<ListPreference
style="@style/Text.ListPreference"/>

<style name="Text.ListPreference">
    <item name="android:textSize">15sp</item>
</style>





<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:robobunny="http://robobunny.com"
    android:key="AppPreference"
    android:summary="@string/PreferenceSummary"
    android:title="@string/Preference" >

     <PreferenceCategory android:title="@string/PreferenceCallCategory"
        android:layout="@layout/preference_category_layout">         

       <ListPreference
          android:key="CallOption"
          android:defaultValue="AllNumber"       
          android:entries="@array/CallAndSMSOption"
          android:entryValues="@array/CallAndSMSOption_values"       
          android:title="@string/CallOptionTitle"
          android:summary="@string/CallOptionSummary" 
          style="@style/myTextLarge"    
          android:layout="@layout/preference_layout"  
        /> 

      </PreferenceCategory> 


</PreferenceScreen>

Answer 1

要更改标题和摘要的文本大小，您可以简单地使用自定义布局：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">

    <TextView android:id="@android:id/title"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:textSize="20sp"/>

    <TextView android:id="@android:id/summary"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:textSize="20sp"/>

</LinearLayout>

编辑：

自定义对话框是一个全新的故事。对话框很难配置。

不幸的是，要更改对话框项的文本大小，您必须为对话框使用自定义适配器。以下是如何从PreessceActive设置它：

final ListPreference listPreference = (ListPreference) findPreference("CallOption");
if (listPreference == null) {
    Log.e("TAG", "Couldn't find the ListPreference");
    return;
}

listPreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
    @Override
    public boolean onPreferenceClick(Preference preference) {
        AlertDialog dialog = (AlertDialog) listPreference.getDialog();
        if (dialog == null) {
            Log.e(TAG, "Couldn't find the dialog");
            return true;
        } else {
            Log.e(TAG, "Dialog found");
        }

        ListView listView = dialog.getListView();
        if (listView == null) {
            Log.e(TAG, "Couldn't find the ListView");
            return true;
        }

        listView.setAdapter(listAdapter);

        return true;
    }
});

笔记：

< li >您的适配器必须使用< code>CheckedTextView，以便它们是可检查的。 < li >您可能需要确保设置被正确保存 < ul > < li >(提示:< code > listview . setonitemclicklistener()；

Answer 2

创建此custom_pref_layout.xml:

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:id="@+android:id/title"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:textSize="40px"/>  

    <TextView android:id="@+android:id/summary"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:textSize="26px"/>

</LinearLayout>

并将其添加到所需的首选项对象中：

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory
        android:title="My Category">             

        <CheckBoxPreference
            android:title="I am a Checkbox Preference"
            android:defaultValue="false"
            android:summary="This is a Checkbox preference"
            android:key="checkboxPref"
            android:layout="@layout/custom_pref_layout"/>

    </PreferenceCategory>
</PreferenceScreen>

Answer 3

import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences.Editor;
import android.graphics.Typeface;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckedTextView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class FontPreference extends DialogPreference implements DialogInterface.OnClickListener {

    // Keeps the font file paths and names in separate arrays
    private List<String> m_fontPaths;
    private List<String> m_fontNames;

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

    @Override
    protected void onPrepareDialogBuilder(Builder builder) {
        super.onPrepareDialogBuilder(builder);
        // Get the fonts on the device
        HashMap<String, String> fonts = FontManager.enumerateFonts();
        m_fontPaths = new ArrayList<String>();
        m_fontNames = new ArrayList<String>();
        // Get the current value to find the checked item
        String selectedFontPath = getSharedPreferences().getString(getKey(), "");
        int idx = 0, checked_item = 0;
        for (String path : fonts.keySet()) {
            if (path.equals(selectedFontPath))
                checked_item = idx;
            m_fontPaths.add(path);
            m_fontNames.add(fonts.get(path));
            idx++;
        }
        // Create out adapter
        // If you're building for API 11 and up, you can pass builder.getContext
        // instead of current context
        FontAdapter adapter = new FontAdapter();
        builder.setSingleChoiceItems(adapter, checked_item, this);
        // The typical interaction for list-based dialogs is to have click-on-an-item dismiss the dialog
        builder.setPositiveButton(null, null);
    }

    public void onClick(DialogInterface dialog, int which) {
        if (which >= 0 && which < m_fontPaths.size()) {
            String selectedFontPath = m_fontPaths.get(which);
            Editor editor = getSharedPreferences().edit();
            editor.putString(getKey(), selectedFontPath);
            editor.commit();
            dialog.dismiss();
        }
    }


    // Font adaptor responsible for redrawing the item TextView with the appropriate font.
    // We use BaseAdapter since we need both arrays, and the effort is quite small.
    public class FontAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            return m_fontNames.size();
        }

        @Override
        public Object getItem(int position) {
            return m_fontNames.get(position);
        }

        @Override
        public long getItemId(int position) {
            // We use the position as ID
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = convertView;
            // This function may be called in two cases: a new view needs to be created,
            // or an existing view needs to be reused
            if (view == null) {
                // Since we're using the system list for the layout, use the system inflater
                final LayoutInflater inflater = (LayoutInflater)
                        getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                // And inflate the view android.R.layout.select_dialog_singlechoice
                // Why? See com.android.internal.app.AlertController method createListView()
                view = inflater.inflate(android.R.layout.select_dialog_singlechoice, parent, false);
            }
            if (view != null) {
                // Find the text view from our interface
                CheckedTextView tv = (CheckedTextView) view.findViewById(android.R.id.text1);
                // Replace the string with the current font name using our typeface
                Typeface tface = Typeface.createFromFile(m_fontPaths.get(position));
                tv.setTypeface(tface);
                // If you want to make the selected item having different foreground or background color,
                // be aware of themes. In some of them your foreground color may be the background color.
                // So we don't mess with anything here and just add the extra stars to have the selected
                // font to stand out.
                tv.setText(m_fontNames.get(position));
            }
            return view;
        }
    }
}

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