着色ImageView无法在Android 5.0上运行。想法如何让它再次运作？ [英] Tinting ImageView not working on Android 5.0. Ideas how to make it work again?

问题描述

在我构建的应用程序中，我注意到ImageViews并没有在运行新Android Lollipop的设备上着色。这是以前在旧版操作系统上正常工作的代码：

In an application I've built I noticed that the ImageViews are not tinted on devices running the new Android Lollipop. This is the code that used to work correctly on older versions of the OS:

<ImageView
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_gravity="bottom|right"
            android:contentDescription="@string/descr_background_image"
            android:src="@drawable/circle_shape_white_color"
            android:tint="@color/intent_circle_green_grey" />

这是在ImageView中加载的drawable：

and this is the drawable that is loaded in the ImageView:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" >
    <gradient android:startColor="@color/white" android:endColor="@color/white"
        android:angle="270"/>
</shape>

再一次，这在运行JellyBean / Kitkat的设备上运行正常，但色调没有影响运行Lollipop的设备。任何想法如何解决它？这是操作系统中的错误，还是应该以不同的方式开始对图像进行着色？

Once again, this is working correctly on devices running JellyBean/Kitkat, but the tint has no effect on devices running Lollipop. Any ideas how to fix it? Is it a bug in the OS, or should I start tinting the image differently?

推荐答案

根据@alanv评论，这里是对这个bug的hacky修复。基本的想法是扩展 ImageView 并在通货膨胀后立即应用 ColorFilter ：

As per @alanv comment, here goes the hacky fix to this bug. Basic idea is to extend ImageView and apply ColorFilter right after inflation:

public class TintImageView extends ImageView {

    public TintImageView(Context context, AttributeSet attrs) {
        super(context, attrs);

        initView();
    }

    private void initView() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            ColorStateList imageTintList = getImageTintList();
            if (imageTintList == null) {
                return;
            }

            setColorFilter(imageTintList.getDefaultColor(), PorterDuff.Mode.SRC_IN);
        }
    }
}

正如你猜测的那样，这个示例有限（ Drawable 在通胀色调不会更新后设置，仅使用默认颜色 ColorStateList ，也许还有别的东西），但是如果你有了这个想法，你就可以把它装到你的用例中。

As you might guess, this example is somewhat limited (Drawable set after inflation tint won't be updated, only default color of ColorStateList is used, and maybe something else), but if you got the idea you can fit it to your use-case.

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