layout_margintop 百分比_layout marginleft_layout marginend用法

Android设备碎片化十分严重，在开发过程中的适配工作也非常很繁琐，有关屏幕适配的介绍请看之前的文章屏幕适配。layout_margintop 百分比

最近看到DrawerLayout，support v4中提供的类，想到对google提供的这些支持库，自己一点都不熟悉，想着看看Google提供的支持库都有什么内容。结果看着看着在最后忽然看到了Percent Support Library。寻思怎么还百分比呢？仔细一看介绍，我擦，真是太有用了。

The Percent package provides APIs to support adding and managing percentage based dimensions in your app.

The Percent Support library adds support for the PercentLayoutHelper.PercentLayoutParams intece and various classes, such as PercentFrameLayout and PercentRelativeLayout.

After you download the Android Support Libraries, this library is located in the /extras/android/support/percent directory. For more information on how to set up your project, follow the instructions in Adding libraries with resources.

The Gradle build script dependency identifier for this library is as follows:

com.android.support:percent:23.3.0

看到了吗？ 说提供了PercentFrameLayout和PercentRelativeLayout来支持百分比了。这样不就完美的解决了适配的问题嘛。啥也不说了，立马配置cradle来瞧瞧。

Subclass of FrameLayout that supports percentage based dimensions and margins. You can specify dimension or a margin of child by using attributes with “Percent” suffix.

上代码:

<android.support.percent.PercentFrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:src="@mipmap/ic_launcher"
        app:layout_widthPercent="50%"
        app:layout_heightPercent="50%"
        app:layout_marginTopPercent="25%"
        app:layout_marginLeftPercent="25%"/>
</android.support.percent.PercentFrameLayout>

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