如何以编程方式获得强调色？

如何以编程方式获取如下样式中的强调色？

    <item name="android:colorAccent">@color/material_green_500</item>

您可以通过以下方式从当前主题中获取它：

private int fetchAccentColor() {
    TypedValue typedValue = new TypedValue();

    TypedArray a = mContext.obtainStyledAttributes(typedValue.data, new int[] { R.attr.colorAccent });
    int color = a.getColor(0, 0);

    a.recycle();

    return color;
}

这也为我工作：

public static int getThemeAccentColor (final Context context) {
    final TypedValue value = new TypedValue ();
    context.getTheme ().resolveAttribute (R.attr.colorAccent, value, true);
    return value.data;
}

private static int getThemeAccentColor(Context context) {
    int colorAttr;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        colorAttr = android.R.attr.colorAccent;
    } else {
        //Get colorAccent defined for AppCompat
        colorAttr = context.getResources().getIdentifier("colorAccent", "attr", context.getPackageName());
    }
    TypedValue outValue = new TypedValue();
    context.getTheme().resolveAttribute(colorAttr, outValue, true);
    return outValue.data;
}

对于那些使用Kotlin的人

fun Context.themeColor(@AttrRes attrRes: Int): Int {
    val typedValue = TypedValue()
    theme.resolveAttribute (attrRes, typedValue, true)
    return typedValue.data
}

我在utils类上有一个静态方法来从当前主题获取颜色。大多数时候是colorPrimary，colorPrimaryDark和accentColor，但是您可以获得更多。

@ColorInt
public static int getThemeColor
(
        @NonNull final Context context,
        @AttrRes final int attributeColor
)
{
    final TypedValue value = new TypedValue();
    context.getTheme ().resolveAttribute (attributeColor, value, true);
    return value.data;
}

这是我的看法：

public static String getThemeColorInHex(@NonNull Context context, @NonNull String colorName, @AttrRes int attribute) {
    TypedValue outValue = new TypedValue();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        context.getTheme().resolveAttribute(attribute, outValue, true);
    } else {
        // get color defined for AppCompat
        int appCompatAttribute = context.getResources().getIdentifier(colorName, "attr", context.getPackageName());
        context.getTheme().resolveAttribute(appCompatAttribute, outValue, true);
    }
    return String.format("#%06X", (0xFFFFFF & outValue.data));
}

用法：

    String windowBackgroundHex = getThemeColorInHex(this, "windowBackground", android.R.attr.windowBackground);
    String primaryColorHex = getThemeColorInHex(this, "colorPrimary", R.attr.colorPrimary);

Kotlin解决方案：

    context.obtainStyledAttributes(TypedValue().data, intArrayOf(R.attr.colorAccent)).let {
        Log.d("AppLog", "color:${it.getColor(0, 0).toHexString()}")
        it.recycle()
    }