Flutter 原生视图：startActivity 无法解析索引 6 处的属性

Question

我正在为第 3 方库实现 Flutter 插件，该库使用原生视图在 Flutter 中显示 Android 视图。该库有一组预定义的视图，它们在点击后启动一个 Activity - 点击由调用 startActivity 的 Android 本机代码处理。

我得到的错误：

Caused by: java.lang.UnsupportedOperationException: Failed to resolve attribute at index 6: TypedValue{t=0x2/d=0x101009b a=1}
    at android.content.res.TypedArray.getColorStateList(TypedArray.java:596)
    at android.widget.TextView.readTextAppearance(TextView.java:3967)
    at android.widget.TextView.<init>(TextView.java:1027)
    at android.widget.TextView.<init>(TextView.java:968)
    at androidx.appcompat.widget.AppCompatTextView.<init>(AppCompatTextView.java:100)
    at androidx.appcompat.widget.AppCompatTextView.<init>(AppCompatTextView.java:95)
    at androidx.appcompat.app.AppCompatViewInflater.createTextView(AppCompatViewInflater.java:194)
    at androidx.appcompat.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:115)
    at androidx.appcompat.app.AppCompatDelegateImpl.createView(AppCompatDelegateImpl.java:1551)
    at androidx.appcompat.app.AppCompatDelegateImpl.onCreateView(AppCompatDelegateImpl.java:1602)
    at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1061)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:997)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:1126)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
    at android.view.LayoutInflater.parseInclude(LayoutInflater.java:1263)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:1119)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
    at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
    at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)

在经历了很多类似的问题之后，这个错误最可能的原因是缺少 colorAccent 或其他值的定义。

我设法调试了应用程序并确定索引 6 对应于 com.android.internal.R.styleable.TextAppearance_textColorLink 这是来自 TextView.java 的完整 sn-p：

    private void readTextAppearance(Context context, TypedArray appearance,
        TextAppearanceAttributes attributes, boolean styleArray) {
    final int n = appearance.getIndexCount();
    for (int i = 0; i < n; i++) {
        final int attr = appearance.getIndex(i);
        int index = attr;
        // Translate style array index ids to TextAppearance ids.
        if (styleArray) {
            index = sAppearanceValues.get(attr, -1);
            if (index == -1) {
                // This value is not part of a Text Appearance and should be ignored.
                continue;
            }
        }
        switch (index) {
            case com.android.internal.R.styleable.TextAppearance_textColorHighlight:
                attributes.mTextColorHighlight =
                        appearance.getColor(attr, attributes.mTextColorHighlight);
                break;
            case com.android.internal.R.styleable.TextAppearance_textColor:
                attributes.mTextColor = appearance.getColorStateList(attr);
                break;
            case com.android.internal.R.styleable.TextAppearance_textColorHint:
                attributes.mTextColorHint = appearance.getColorStateList(attr);
                break;
            case com.android.internal.R.styleable.TextAppearance_textColorLink:
          --->      attributes.mTextColorLink = appearance.getColorStateList(attr);
                break;
            case com.android.internal.R.styleable.TextAppearance_textSize:
                attributes.mTextSize =
                        appearance.getDimensionPixelSize(attr, attributes.mTextSize);
                attributes.mTextSizeUnit = appearance.peekValue(attr).getComplexUnit();
                break;

我尝试将以下属性添加到应用程序样式和用于扩展平台视图的样式中：

    <style name="MainTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:textAppearance">@style/CustomTextAppearance</item>
    <item name="colorPrimary">#d3b170</item>
    <item name="colorPrimaryDark">#d3b170</item>
    <item name="colorAccent">#d3b170</item>
    <item name="android:textColorPrimary">#d3b170</item>
    <item name="android:textColorLink">#d3b170</item>
    <item name="android:colorAccent">#d3b170</item>
    <item name="android:colorPrimary">#d3b170</item>
    <item name="android:colorPrimaryDark">#d3b170</item>
</style>
<style name="CustomTextAppearance" parent="TextAppearance.AppCompat.Headline">
    <item name="android:textColor">#d3b170</item>
</style>

平台视图本身是通过以下方式创建的：

internal class CustomNativeView(context: Context, id: Int, creationParams: Map<String?, Any?>?) :
PlatformView {
private val view: NativeView

override fun getView(): View {
    return view
}

override fun dispose() {}

init {
    view = NativeView(ContextThemeWrapper(context, R.style.MainTheme), null)
}}

总结一下： CustomNativeView 是显示在AndroidView 内部的平台视图，该视图在单击后（在本机端）启动一个活动，由于上述错误而无法充气。

Answer 1

在深入研究库源代码后，我注意到新创建的 Activity 在 onCreate() 中设置了自定义主题。在插件的 style.xml 中覆盖这个样式解决了这个问题：

<style name="Theme.SomePlugin.XYZ.NoActionBar" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:textColorLink">#000000</item>
</style>