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android - 使用 prefs.xml 进行颜色更改的 Activity 在启动时崩溃

转载 作者：行者123 更新时间：2023-11-30 02:22:11 26 4
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我正在尝试使用 SettingsActivity 更改我的主要 Activity 的背景和/或文本颜色，该 Activity 通过设置按钮打开并且几乎只调用 addPreferencesFromResource(R.xml.preferences)。这是设置 Activity :

public class SettingsActivity extends PreferenceActivity {

@SuppressWarnings("deprecation")

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.preferences);
}
}

我在 arrays.xml 中有字符串数组 text_color_entries 保存名称，..._values 保存 @android:color/... 类似值和 #rrggbb 值:

<resources>

<string-array name="text_size_entries">
    <item>16 pt</item>
    <item>18 pt</item>
    <item>20 pt</item>
    <item>22 pt</item>
    <item>24 pt</item>
    <item>26 pt</item>
</string-array>
<string-array name="text_size_values">
    <item>16</item>
    <item>18</item>
    <item>20</item>
    <item>22</item>
    <item>24</item>
    <item>26</item>
</string-array>
<string-array name="background_colour_entries">
    <item>Original</item>
    <item>White</item>
    <item>Light Orange</item>
    <item>Dark Orange</item>
    <item>Light Green</item>
    <item>Dark Green</item>
    <item>Light Red</item>
    <item>Dark Red</item>
    <item>Bright Blue</item>
    <item>Light Blue</item>
    <item>Dark Blue</item>
    <item>Black</item>
</string-array>
<string-array name="background_colour_values">
    <item>#0030ff</item>
    <item>@android:color/background_light</item>
    <item>@android:color/holo_orange_dark</item>
    <item>@android:color/holo_green_light</item>
    <item>@android:color/holo_green_dark</item>
    <item>@android:color/holo_red_light</item>
    <item>@android:color/holo_red_dark</item>
    <item>@android:color/holo_blue_bright</item>
    <item>@android:color/holo_blue_light</item>
    <item>@android:color/holo_blue_dark</item>
    <item>@android:color/background_dark</item>
</string-array>
<string-array name="text_colour_entries">
    <item>Original(Light Orange)</item>
    <item>White</item>
    <item>Light Orange</item>
    <item>Dark Orange</item>
    <item>Light Green</item>
    <item>Dark Green</item>
    <item>Light Red</item>
    <item>Dark Red</item>
    <item>Bright Blue</item>
    <item>Light Blue</item>
    <item>Dark Blue</item>
    <item>Black</item>
</string-array>
<string-array name="text_colour_values">
    <item>@android:color/holo_orange_light</item>
    <item>@android:color/background_light</item>
    <item>@android:color/holo_orange_dark</item>
    <item>@android:color/holo_green_light</item>
    <item>@android:color/holo_green_dark</item>
    <item>@android:color/holo_red_light</item>
    <item>@android:color/holo_red_dark</item>
    <item>@android:color/holo_blue_bright</item>
    <item>@android:color/holo_blue_light</item>
    <item>@android:color/holo_blue_dark</item>
    <item>@android:color/background_dark</item>
</string-array>
</resources>

还有一个包含 CheckboxPreference 和 3 个 ListPreferences 的 preferences.xml:

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

<CheckBoxPreference
    android:key="pref_text_bold"
    android:title="Make Text Bold"
    android:summary="Makes the note text bold"
    android:defaultValue="false"/>

<ListPreference
    android:key="pref_text_size"
    android:title="Text Size"
    android:summary="Pick the text size"
    android:entries="@array/text_size_entries"
    android:entryValues="@array/text_size_values"
    android:defaultValue="16"/>
 <!-- Works if I erase/comment out anything below here -->
<ListPreference
    android:key="pref_background_colour"
    android:title="Background colour"
    android:summary="Choose the background colour of the app"
    android:entries="@array/background_colour_entries"
    android:entryValues="@array/background_colour_values"
    android:defaultValue="#0030ff"/>

<ListPreference
        android:key="pref_text_colour"
        android:title="Text colour"
        android:summary="Choose the colour of your text"
        android:entries="@array/text_colour_entries"
        android:entryValues="@array/text_colour_values"
        android:defaultValue="@android:color/holo_orange_light"/>

</PreferenceScreen>

当我只有 CheckboxPreference 和第一个 ListPreference 时，它​​工作得很好。当我注释掉其他 2 个 Listpreferences 时，它也能正常工作。但是只要我在应用程序中至少有一个其他 ListPreferences，它就会在我尝试打开设置 Activity 时崩溃。我还没有在我的 MainActivity 中实现其他两个首选项列表，我想先让布局工作。

奖金问题:我到底应该如何实现背景和 edittext-text 颜色变化，甚至可以使用资源链接，我可以使用 

   <color>

数组代替？

感谢您抽出时间，我希望上面的内容不会太多。

您好，马龙

编辑:试图调试，并没有真正帮助我。经历了一些我不知道的更深层次的类(class)，然后崩溃了。另外，LogCat 说某处有一个 NullPointerException，但没有给我代码中的具体位置，只指向
ListPreference.findiIndexOfValue(Listpreference.java:223)

编辑 2:esme-louise 指出我的值数组缺少一行。我改变了它，不幸的是它没有解决问题。

编辑 3:color.xml 现在看起来像奥迪描述的那样，ListPrefrence 现在有 android:entries="@array/background_colors"
android:entryValues="@array/background_colors"但在启动设置 Activity 时仍然会导致应用程序崩溃。

编辑 4:我现在把 notesEditText.setTextColor(Color.parseColor(sharedPreferences.getString
("pref_background_colour", "@color/OriginalBackground")));进入从设置返回时调用的方法，在 Layout 工作时担心这一点。

LogCat:

02-08 16:07:25.395  23749-23749/com.regenhardt.savingstate E/﹕ appName=com.regenhardt.savingstate, acAppName=/system/bin/surfaceflinger
02-08 16:07:25.395  23749-23749/com.regenhardt.savingstate E/﹕ 0
02-08 16:07:29.357  23749-23749/com.regenhardt.savingstate E/TextView﹕ get resource from application failed.
**This one comes many, many times here and before the surfaceflinger thing, practically all the time it's running. I deleted a TextView from the layout and commented it out of the java code; wasn't anything dynamic, just a title**
02-08 16:07:30.932  23749-23749/com.regenhardt.savingstate E/TextView﹕ get resource from application failed.
02-08 16:07:30.952  23749-23749/com.regenhardt.savingstate E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.regenhardt.savingstate, PID: 23749
    java.lang.NullPointerException
            at android.preference.ListPreference.findIndexOfValue(ListPreference.java:223)
**From here on stuff I couldn't even begin to understand so didn't bother digging into android**
            at android.preference.ListPreference.getValueIndex(ListPreference.java:232)
            at android.preference.ListPreference.getEntry(ListPreference.java:210)
            at android.preference.ListPreference.getSummary(ListPreference.java:156)
            at android.preference.Preference.onBindView(Preference.java:534)
            at android.preference.Preference.getView(Preference.java:472)
            at android.preference.PreferenceGroupAdapter.getView(PreferenceGroupAdapter.java:221)
            at android.widget.AbsListView.obtainView(AbsListView.java:2338)
            at android.widget.ListView.makeAndAddView(ListView.java:1812)
            at android.widget.ListView.fillDown(ListView.java:698)
            at android.widget.ListView.fillFromTop(ListView.java:759)
            at android.widget.ListView.layoutChildren(ListView.java:1645)
            at android.widget.AbsListView.onLayout(AbsListView.java:2149)
            at android.view.View.layout(View.java:15125)
            at android.view.ViewGroup.layout(ViewGroup.java:4862)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
            at android.view.View.layout(View.java:15125)
            at android.view.ViewGroup.layout(ViewGroup.java:4862)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
            at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1877)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1653)
            at android.view.View.layout(View.java:15125)
            at android.view.ViewGroup.layout(ViewGroup.java:4862)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
            at android.view.View.layout(View.java:15125)
            at android.view.ViewGroup.layout(ViewGroup.java:4862)
            at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
            at android.view.View.layout(View.java:15125)
            at android.view.ViewGroup.layout(ViewGroup.java:4862)
            at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
            at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
            at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
            at android.view.View.layout(View.java:15125)
            at android.view.ViewGroup.layout(ViewGroup.java:4862)
            at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
            at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
            at android.view.View.layout(View.java:15125)
            at android.view.ViewGroup.layout(ViewGroup.java:4862)
            at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2317)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2023)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
            at android.view.Choreographer.doCallbacks(Choreographer.java:591)
            at android.view.Choreographer.doFrame(Choreographer.java:560)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
            at android.os.Handler.handleCallback(Handler.java:808)
            at android.os.Handler.dispatchMessage(Handler.java:103)
            at android.os.Looper.loop(Looper.java:193)
            at android.app.ActivityThread.main(ActivityThread.java:5292)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
            at dalvik.system.NativeStart.main(Native Method)

最佳答案

尝试使用颜色数组而不是字符串数组。是这样的

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="black">#000000</color>
    <color name="white">#FFFFFF</color>
</resources>

将此添加到您的 strings.xml

<string-array name="backgroud_entries">
     <item>Black</item>
     <item>White</item>
</string-array>

<string-array name="background_entry_values">
     <item>@color/black</item>
     <item>@color/white</item>
</string-array>

像这样修改您的 ListPreference

<ListPreference
    android:key="pref_background_colour"
    android:title="Background colour"
    android:summary="Choose the background colour of the app"
    android:entries="@array/background_entries"
    android:entryValues="@array/background_entry_values"
    android:defaultValue="#0030ff"/>

关于android - 使用 prefs.xml <ListPreference> 进行颜色更改的 Activity 在启动时崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28324044/

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