android - 使普通布局看起来像 PreferenceScreen

Question

PreferenceScreen 对我来说不够好，因为我必须向 Spinner 添加项目。这些项目需要来自数据列表。

我有一个自定义的 ArrayAdapter，它会在我单击它时返回项目的名称。它返回项目中包含的数据。

我想在 ListPreference(这是 PreferenceScreen 中的微调器)中使用相同的 ArrayAdapter，但 ListPreference 不允许我使用适配器。

因此，我想在不使用实际 PreferenceScreen(和 PreferenceCategory)的情况下重新创建 PreferenceScreen(使用 PreferenceCategory)的外观

图书馆可以做到这一点吗？我还没找到。

谢谢，

蒂姆

Answer 1

我试着收集我的第一个方法——我希望我没有忘记包括一些部分(aapart 颜色定义或 statelist 可绘制对象，这是您自己制作的一项微不足道的任务)

自定义标准首选项

/res/xml/prefs.xml

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

    <!-- ... -->

    <PreferenceCategory android:title="@string/pref_vibrate_cat">
        <CheckBoxPreference
            android:persistent="true"
            android:key="vibrate"
            android:title="@string/pref_vibrate_title"
            android:summary="@string/pref_vibrate_summ"
            android:defaultValue="true"
            android:layout="@layout/prefs"
        />
    </PreferenceCategory>

    <!-- ... -->

    <!-- Just to show how to use a custom preference (you must have the corresponding java Class in your project) -->
    <PreferenceCategory android:title="@string/pref_tts_cat">
        <com.dergolem.abc.CLS_Prefs_Multi
            android:persistent="true"
            android:key="tts"
            android:title="@string/pref_tts_title"
            android:summary="@string/nothing"
            android:dialogTitle="@string/pref_tts_dlg"
            android:dialogIcon="@android:drawable/sym_action_chat"
            android:entries="@array/prefs_tts_titles"
            android:entryValues="@array/prefs_tts_values"
            android:defaultValue="@array/prefs_tts_defaults"
            android:layout="@layout/prefs"
            android:widgetLayout="@layout/arr_dn"
        />
    </PreferenceCategory>

    <!-- ... -->

</PreferenceScreen>

/res/layout/prefs.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Layout for a visually child-like Preference in a PreferenceActivity. -->
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:baselineAligned="false"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="?android:attr/listPreferredItemHeight"
    android:gravity="center_vertical"
    android:paddingStart="16dp"
    android:paddingEnd="?android:attr/scrollbarSize"
    >
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:minWidth="16dp"
        android:gravity="center"
        android:orientation="horizontal"
        >
        <ImageView
            android:id="@+android:id/icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
        />
    </LinearLayout>
    <RelativeLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:layout_weight="1"
        >
        <TextView
            android:id="@+android:id/displayTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textStyle="bold"
            android:ellipsize="marquee"
            android:fadingEdge="horizontal"
        />
        <TextView
            android:id="@+android:id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:textStyle="bold"
            android:ellipsize="marquee"
            android:fadingEdge="horizontal"
        />
        <TextView
            android:id="@+android:id/summary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@android:id/title"
            android:layout_alignStart="@android:id/title"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:textColor="?android:attr/textColorSecondary"
            android:shadowColor="@color/white"
            android:shadowDx="1"
            android:shadowDy="1"
            android:shadowRadius="1"
            android:maxLines="4"
        />
    </RelativeLayout>
    <!-- Preference should place its actual preference widget here. -->
    <LinearLayout
        android:id="@+android:id/widget_frame"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:minWidth="48dp"
        android:gravity="center"
        android:orientation="vertical"
    />
</LinearLayout>

/src/ACT_Prefs

package com.dergolem.abc;

/* ---------------------------------- Imports ------------------------------- */

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.widget.ListView;

public final class ACT_Prefs // NO_UCD (use default)
extends PreferenceActivity
implements OnSharedPreferenceChangeListener
{
    /* ------------------------------ Objects ------------------------------- */

    private Context ctx = null;

    /* ----------------------------- Overrides ------------------------------ */

    // Reload the Activity on rotation.
    @Override
    public final void onConfigurationChanged(final Configuration cfg)
    {
        super.onConfigurationChanged(cfg);
        reStart();
    }
    /*
    Load the Preference Activity if the API LEvel is less than 11 or else load
    the PreferenceFragment.
    Needed workaround, since unfortunately Google didn't include the
    PreferenceFragment in the support library
    */
    @Override
    public final void onCreate(final Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        ctx = getApplicationContext();

        if (Build.VERSION.SDK_INT < 11)
        {
            createPreference_Activity();
        }
        else
        {
            createPreference_Fragment();
        }
    }
    @Override
    protected void onPause()
    {
        // Unregister OnSharedPreferenceChangeListener
        PreferenceManager.getDefaultSharedPreferences(ctx).
        unregisterOnSharedPreferenceChangeListener(this);

        // Call the base method
        super.onPause();
    }
    @Override
    protected void onResume()
    {
        // Register OnSharedPreferenceChangeListener
        PreferenceManager.getDefaultSharedPreferences(ctx).
        registerOnSharedPreferenceChangeListener(this);

        // Fire the base method
        super.onResume();
    }

    /* ------------------------------ Methods ------------------------------- */

    @SuppressWarnings("deprecation")
    private final void createPreference_Activity()
    {
        // Set the Activity layout
        addPreferencesFromResource(R.xml.prefs);

        // Get the PreferenceScreen ListView
        final ListView lvw = getListView();

        // Set the horizontal separator
        lvw.setDivider(getResources().getDrawable(R.drawable.list_divider));
        lvw.setDividerHeight((1));

        // Set the statelist selector
        lvw.setSelector(R.drawable.list_item_colors);

        // Remove the top and bottom fadings
        lvw.setVerticalFadingEdgeEnabled(false);
    }
    @SuppressLint("NewApi")
    private final void createPreference_Fragment()
    {
        // Create the fragment.
        getFragmentManager().beginTransaction().replace
            (android.R.id.content, new FRG_Prefs()).commit();
        getFragmentManager().executePendingTransactions();
    }
}

/src/FRG_Prefs

package com.dergolem.abc;

/* ---------------------------------- Imports ------------------------------- */

import android.annotation.SuppressLint;
import android.graphics.PixelFormat;
import android.preference.PreferenceFragment;
import android.view.View;
import android.widget.ListView;

@SuppressLint("NewApi")
public final class FRG_Prefs
extends PreferenceFragment
{
    /* ----------------------------- Overrides ------------------------------ */

    @Override
    public final void onResume()
    {
        super.onResume();
        addPreferencesFromResource(R.xml.prefs);

        init();
    }
    @Override
    public final void onStop()
    {
        super.onStop();
        // Kill the prefence screen, so that it won't be recreated DUPLICATE.
        // HORRIBLE, but it's the only way to avoid the PreferenceScreen copycat.
        getActivity().finish();
    }

    /* ------------------------------ Methods ------------------------------- */

    private final void init()
    {
        final View v = getView();

        v.setPadding(paddingSize, 0, paddingSize, 0);

        // Get the PreferenceScreen ListView
        final ListView lvw = (ListView) v.findViewById(android.R.id.list);

        // Set the horizontal separator
        lvw.setDivider(getResources().getDrawable(R.drawable.list_divider));
        lvw.setDividerHeight((1));

        // Set the state selector
        lvw.setSelector(R.drawable.list_item_colors);

        // Remove top and bottom fading
        lvw.setVerticalFadingEdgeEnabled(false);
    }
}

显示我的偏好:

startActivity(new Intent(ctx, ACT_Prefs.class));

ctx 定义为

Context ctx = getApplicationContext();

因为我用的比较多，所以我一劳永逸地定义了

[编辑]

根据要求，我可以添加一个方法来制作一个Fake PreferenceScreen。