如何正确使用向后兼容的Vector Drawable与最新的Android支持库? [英] How to properly use backwards compatible Vector Drawable with the latest Android Support Library?

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问题描述

Vector drawable已经添加到支持库中不久以前,从那时起API中发生了很多变化:Gradle标记,初始化块,选择器,自定义XML属性等。问题是 - 如何正确使用在这些情况下它现在(支持lib v25):

Vector drawable has been added to Support Library not so long time ago and there were a lot of changes in the API since then: Gradle flags, initializer blocks, selectors, custom XML attributes etc. The question is - how to properly use it now (support lib v25) in these cases:


  • ImageView

  • TextView drawable

  • 菜单图标

  • 通知图标

  • ImageView
  • TextView drawable
  • Menu icon
  • Notification icon

XML和编程方式。

XML and programmatically.

推荐答案

将最新的支持库添加到应用程序的 build.gradle 依赖项:

Add the latest support lib to your app's build.gradle dependencies:

compile 'com.android.support:appcompat-v7:26.0.2'

并在同一档案中添加以下行:

and add the following line in the same file:

android {
    ...
    defaultConfig {
        ...
        vectorDrawables.useSupportLibrary = true
    }
    ...
}

通过 Vector Asset Studio 。

这就是全部,你准备好了!

XML

使用 app:srcCompat 属性而不是 android:src

<ImageView
    ...
    app:srcCompat="@drawable/your_vector" 
    ... />

以编程方式

直接来自资源ID:

imageView.setImageResource(R.drawable.your_drawable);

设为可绘制对象(例如,用于着色):

Set as Drawable object (e.g. for tinting):

Drawable vectorDrawable 
                = AppCompatResources.getDrawable(context, R.drawable.your_vector);
imageView.setImageDrawable(vectorDrawable);

如果你想设置色调:

DrawableCompat.setTint
             (vectorDrawable, ContextCompat.getColor(context, R.color.your_color));






TextView drawable



XML

没有简单的解决方案:XML属性 android:drawableTop(Bottom等) )无法处理前Lollipop上的矢量图像。一种解决方案是将初始化程序块添加到活动中并将vector包装到另一个XML drawable 中。第二 - 定义自定义TextView

There is no simple solution: XML attribute android:drawableTop(Bottom etc) can't handle vector images on pre-Lollipop. One solution is to add initializer block to activity and wrap vector into another XML drawable. Second - to define a custom TextView.

以编程方式

直接设置资源不起作用,您必须使用 Drawable 对象。以与 ImageView 相同的方式获取它,并使用适当的方法设置它:

Setting resource directly doesn't work, you have to use Drawable object. Get it the same way as for ImageView and set it with the appropriate method:

textView.setCompoundDrawablesWithIntrinsicBounds(vectorDrawable, null, null, null);






菜单图标



没有什么特别之处:


Menu icon

There is nothing special:

<item
    ...
    android:icon="@drawable/your_vector"
    ... />

menuItem.setIcon(R.drawable.your_vector);






通知:



不可能,你必须使用PNG :(


Notifications:

It's impossible, you have to use PNGs :(

这篇关于如何正确使用向后兼容的Vector Drawable与最新的Android支持库?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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