DrawableCompat着色不能在pre-棒棒糖工作 [英] DrawableCompat tinting does not work on pre-Lollipop

问题描述

我使用的是新TextInputLayout来包装一个EditText。当我确定一个字段我做了以下错误：

I'm using the new TextInputLayout to wrap an EditText. When I determine a field has an error I do the following:

Drawable drawable = DrawableCompat.wrap(getEditText().getBackground());

DrawableCompat.setTintList(drawable, ColorStateList.valueOf(Color.RED));

这适用于5.0和曲折的红色下划线，但会在4.4或4.1的测试设备什么都没有。我在想什么吗？看起来很简单，按照谷歌只是工作... pretty的肯定我有它的最新版本，以及：

This works on 5.0 and turns the underline red, but does nothing on 4.4 or 4.1 test devices. What am I missing here? Seems so simple and according to google "just works"... pretty sure I have the latest version of it as well:

编译com.android.support:design:22.2.0

compile 'com.android.support:design:22.2.0'

FWIW，如果我做setColorFilter，而不是setTint那么它适用于所有平台，但后来我有问题，它会离开，不要回来，尽快为重点设置/左/等...我倒是preFER与色调做到这一点（和真正的preFER有色调适用于重点和非重点国家，如果有人正在寻找额外的分数笑）

FWIW, if I do setColorFilter instead of setTint then it works on all platforms but then I have issues with it going away and not coming back as soon as the focus is set/left/etc... I'd prefer to do it with tint (and really prefer to have the tint apply to the focus and non-focus states if anybody is looking for extra credit lol)

谢谢！

推荐答案

当你调用包裹（）那么原来的绘制对象被包裹内进入一个新的 DrawableWrapper 这是用来实现对旧设备的着色。因此，要使它工作，你必须设置返回绘制对象回的EditText ：

When you call wrap() then the original Drawable is wrapped internally into a new DrawableWrapper which is used to implement the tinting on older devices. So to make it work you have to set the returned Drawable back to the EditText:

final Drawable originalDrawable = editText.getBackground();
final Drawable wrappedDrawable = DrawableCompat.wrap(originalDrawable);
DrawableCompat.setTintList(wrappedDrawable, ColorStateList.valueOf(Color.RED));
editText.setBackground(wrappedDrawable);

---

如果你想确保向后超越API级别16的兼容性，运行了一个小障碍

。 的setBackground（）中添加了API级别16，你需要调用 setBackgroundDrawable（）之前的设备。这是最好的实现它会替你一个辅助方法：

---

If you want to ensure backwards compatibility beyond API level 16 you run into a little snag. setBackground() was added in API level 16 and you need to call setBackgroundDrawable() on devices before that. It's best to implement a helper method which does that for you:

public static void setBackground(View view, Drawable background) {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        view.setBackground(background);
    } else {
        view.setBackgroundDrawable(background);
    }
}

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