当我在ActionBar中创建导航下拉列表时,为什么文本是黑色而不是白色？

Question

注意:这是我的第一个Android应用程序,我不知道我在做什么.指导我到文档而不解释我应该寻找的内容将没有用,因为我已经尝试阅读文档并且还没有理解它.

我在ActionBar中创建一个导航下拉列表,文本是黑色而不是白色(就像我的ActionBar中的其他文本一样).我认为这是因为我在ArrayAdapter中使用了错误的东西,但其他任何值都没有效果.以下是我用来创建下拉列表的代码.

//NOTE: folders will be created at runtime from data fetched from a web service,
//these values are just test data to get the feature working
folders = new ArrayList<String>(Arrays.asList("All Folders", "comics"));
final ArrayAdapter<String> aa = new ArrayAdapter<String>(
    this,
    android.R.layout.simple_list_item_1,
    folders
);

final ActionBar bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
bar.setListNavigationCallbacks(aa, new ActionBar.OnNavigationListener() {
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
        final Context c = getApplicationContext();
        Toast.makeText(c, folders.get(itemPosition), Toast.LENGTH_SHORT).show();
        return true;
    }
});

我所看到的例子:

我想了解为什么文本是错误的颜色,并希望如何使用正确的颜色创建它.我不想自定义颜色(就像我发现的很多问题一样),我只是希望它以与ActionBar中其他东西相同的样式创建.

这是styles.xml文件:

<resources>

    <!--
        Base application theme, dependent on API level. This theme is replaced
        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
    -->
    <style name="AppBaseTheme" parent="android:Theme.Light">
        <!--
            Theme customizations available in newer API levels can go in
            res/values-vXX/styles.xml, while customizations related to
            backward-compatibility can go here.
        -->
    </style>

    <!-- Application theme. -->
    <style name="AppTheme" parent="AppBaseTheme">
        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
    </style>

</resources>

Answer 1

正如我所怀疑的那样,人们所建议的样式的所有jiggery-pokery都只是修补了首先做错事的代码.代码onCreate应该看起来像这样:

    // Set up the dropdown list navigation in the action bar.
    actionBar.setListNavigationCallbacks(
            // Specify a SpinnerAdapter to populate the dropdown list.
            new ArrayAdapter<String>(
                    actionBar.getThemedContext(),
                    android.R.layout.simple_list_item_1,
                    android.R.id.text1,
                    new String[] {
                            "All Folders",
                            "comics",
                            "test"
                    }),
            this);

我应该有一个onNavigationItemSelected方法:

@Override
public boolean onNavigationItemSelected(int position, long id) {
    // When the given dropdown item is selected, show its contents in the
    // container view.

    return true;
}

关键部分是actionBar.getThemedContext()方法.