android - 首选项列表仅显示第一个元素

Question

我正在开发一个带有自定义 Preference View 的 PreferenceActivity。我的问题是我用 ListView 创建了一个 View ，它只显示第一个元素。我发布我的代码和图片: http://imageshack.us/photo/my-images/545/sc20120307161530.png/

http://img545.imageshack.us/img545/7207/sc20120307161530.png' border='0'/>

xml:

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

    <PreferenceCategory
        android:key="player_settings"
        android:title="@string/settings_player_config" >
        <EditTextPreference
            android:defaultValue="@string/settings_player_default_name"
            android:dialogMessage="@string/settings_player_summary"
            android:dialogTitle="@string/settings_playersname"
            android:key="player_name"
            android:summary="@string/settings_player_summary"
            android:title="@string/settings_playersname" />
    </PreferenceCategory>
    <PreferenceCategory
        android:key="volume"
        android:title="@string/settings_volume" >
        <com.battleship.preferences.SeekBarPreferences
            android:defaultValue="50"
            android:key="volume"
            android:title="@string/settings_volume" />
    </PreferenceCategory>
    <PreferenceCategory
        android:key="shine"
        android:title="@string/settings_shine" >
        <com.battleship.preferences.SeekBarPreferences
            android:defaultValue="50"
            android:key="shine"
            android:title="@string/settings_shine" />
    </PreferenceCategory>
    <PreferenceCategory
        android:key="themeTitle"
        android:title="@string/settings_group_themes" >
        <com.battleship.preferences.ListPreferences android:key="theme" />
    </PreferenceCategory>
    <PreferenceCategory
        android:key="fontsTitle"
        android:title="@string/settings_group_font_size" >
        <com.battleship.preferences.ListPreferences android:key="font" />
    </PreferenceCategory>

</PreferenceScreen>

自定义列表首选项:

package com.battleship.preferences;

import com.battleship.R;

import android.content.Context;
import android.content.SharedPreferences;
import android.media.AudioManager;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class ListPreferences extends Preference implements
        OnCheckedChangeListener {

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

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

    public ListPreferences(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onClick() {

        super.onClick();
        Toast t = Toast.makeText(getContext(), "HOLA!", 3);
        t.show();
    }

    @Override
    protected View onCreateView(ViewGroup parent) {



        String[] contentString = new String[3];
        if (getKey().equals("theme")) {
            contentString = new String[] {
                    (getContext().getString(R.string.settings_theme_default)),
                    (getContext().getString(R.string.settings_theme_black)),
                    (getContext().getString(R.string.settings_theme_white)) };
        } else {
            contentString = new String[] {
                    (getContext().getString(R.string.settings_font_big)),
                    (getContext().getString(R.string.settings_font_medium)),
                    (getContext().getString(R.string.settings_font_little)) };
        }

        ListView listView = new ListView(getContext());
        ArrayAdapter<String> array = new ArrayAdapter<String>(getContext(),
                android.R.layout.simple_list_item_single_choice,
                android.R.id.text1, contentString);
        listView.setAdapter(array);
        listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);


        return listView;
    }

    private void updatePreference(int intRadio) {
        SharedPreferences.Editor editor = getEditor();
        editor.putInt(getKey(), intRadio);
        editor.commit();
    }


}

Answer 1

当每个人都试图告诉您您不应该那样做而不只是回答您的问题时，您不讨厌吗？能够动态生成内容对于应用程序的灵 active 至关重要，我完全了解您的需求。

假设所有 ListView 条目的高度大致相同(不相关的部分已省略)，这将起作用。顺序很重要，请尽量按照我的指示进行:

import android.view.ViewGroup.OnHierarchyChangeListener;

public class ListPreferences extends Preference implements
    OnCheckedChangeListener, OnHierarchyChangeListener {

private ListView listView;
private View thisView;
private int listHeight = 0;

@Override
protected View onCreateView(ViewGroup parent) {
    this.setLayoutResource(R.layout.listview_preference_layout);
    thisView = super.onCreateView(parent);
    listView = (ListView) thisView.findViewById(android.R.id.list);
    listView.setOnHierarchyChangeListener(this);
    String[] contentString = new String[3];
    if (getKey().equals("theme")) {
        contentString = new String[] {
        (getContext().getString(R.string.settings_theme_default)),
        (getContext().getString(R.string.settings_theme_black)),
        (getContext().getString(R.string.settings_theme_white)) };
    } else {
        contentString = new String[] {
        (getContext().getString(R.string.settings_font_big)),
        (getContext().getString(R.string.settings_font_medium)),
        (getContext().getString(R.string.settings_font_little)) };
    }

    ArrayAdapter<String> array = new ArrayAdapter<String>(getContext(),
        android.R.layout.simple_list_item_single_choice,
        android.R.id.text1, contentString);
    listView.setAdapter(array);
    listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    return thisView;
}

public void onChildViewAdded(View parent, View child) {
    int childHeight = child.getMeasuredHeight();
    if(childHeight > 0)
    {
        listHeight = listView.getAdapter().getCount() * childHeight;
        thisView.setMinimumHeight(listHeight);
        Log.i(TAG,"onChildViewAdded, done: "+listHeight+" "+childHeight);
    }
}

public void onChildViewRemoved(View parent, View child) {
}


}

您还需要具有以下内容的 res/layout/listview_preference_layout.xml:

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="fill_vertical|fill_horizontal|fill"
    android:gravity="fill"
    android:orientation="vertical"
   >
    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:clipChildren="true" 
        android:isScrollContainer="true"
        android:layout_gravity="fill_vertical|fill_horizontal|fill"
        android:layout_weight="1"
        android:choiceMode="singleChoice"/>
</LinearLayout