1page.title=Working with Drawables 2 3@jd:body 4 5<div id="tb-wrapper"> 6<div id="tb"> 7<h2>This lesson teaches you to</h2> 8<ol> 9 <li><a href="#DrawableTint">Tint Drawable Resources</a></li> 10 <li><a href="#ColorExtract">Extract Prominent Colors from an Image</a></li> 11 <li><a href="#VectorDrawables">Create Vector Drawables</a></li> 12</ol> 13<h2>You should also read</h2> 14<ul> 15 <li><a href="http://www.google.com/design/spec">Material design specification</a></li> 16 <li><a href="{@docRoot}design/material/index.html">Material design on Android</a></li> 17 <li><a href="{@docRoot}tools/help/vector-asset-studio.html">Vector Asset Studio</a></li> 18 <li><a href="{@docRoot}tools/help/image-asset-studio.html">Image Asset Studio</a></li> 19</ul> 20</div> 21</div> 22 23<p>The following capabilities for drawables help you implement material design in your apps:</p> 24 25<ul> 26<li>Drawable tinting</li> 27<li>Prominent color extraction</li> 28<li>Vector drawables</li> 29</ul> 30 31<p>This lesson shows you how to use these features in your app.</p> 32 33 34<h2 id="DrawableTint">Tint Drawable Resources</h2> 35 36<p>With Android 5.0 (API level 21) and above, you can tint bitmaps and nine-patches defined as 37alpha masks. You can tint them with color resources or theme attributes that resolve to color 38resources (for example, <code>?android:attr/colorPrimary</code>). Usually, you create these assets 39only once and color them automatically to match your theme.</p> 40 41<p>You can apply a tint to {@link android.graphics.drawable.BitmapDrawable}, {@link 42android.graphics.drawable.NinePatchDrawable} or {@link 43android.graphics.drawable.VectorDrawable} objects with the {@code setTint()} method. You can 44also set the tint color and mode in your layouts with the <code>android:tint</code> and 45<code>android:tintMode</code> attributes.</p> 46 47 48<h2 id="ColorExtract">Extract Prominent Colors from an Image</h2> 49 50<p>The Android Support Library r21 and above includes the {@link 51android.support.v7.graphics.Palette} class, which lets you extract prominent colors from an image. 52This class extracts the following prominent colors:</p> 53 54<ul> 55<li>Vibrant</li> 56<li>Vibrant dark</li> 57<li>Vibrant light</li> 58<li>Muted</li> 59<li>Muted dark</li> 60<li>Muted light</li> 61</ul> 62 63<p>To extract these colors, pass a {@link android.graphics.Bitmap} object to the 64{@link android.support.v7.graphics.Palette#generate Palette.generate()} static method in the 65background thread where you load your images. If you can't use that thread, call the 66{@link android.support.v7.graphics.Palette#generateAsync Palette.generateAsync()} method and 67provide a listener instead.</p> 68 69<p>You can retrieve the prominent colors from the image using the getter methods in the 70<code>Palette</code> class, such as <code>Palette.getVibrantColor</code>.</p> 71 72<p>To use the {@link android.support.v7.graphics.Palette} class in your project, add the following 73<a href="{@docRoot}studio/build/index.html#dependencies">Gradle dependency</a> to your 74app's module:</p> 75 76<pre> 77dependencies { 78 ... 79 compile 'com.android.support:palette-v7:21.0.0' 80} 81</pre> 82 83<p>For more information, see the API reference for the {@link android.support.v7.graphics.Palette} 84class.</p> 85 86 87<h2 id="VectorDrawables">Create Vector Drawables</h2> 88 89<!-- video box --> 90<a class="notice-developers-video" 91 href="https://www.youtube.com/watch?v=wlFVIIstKmA" 92 style="margin-top:18px"> 93<div> 94 <h3>Video</h3> 95 <p>Android Vector Graphics</p> 96</div> 97</a> 98 99<p>In Android 5.0 (API Level 21) and above, you can define vector drawables, which scale without 100losing definition. You need only one asset file for a vector image, as opposed to an asset file for 101each screen density in the case of bitmap images. To create a vector image, you define the details 102of the shape inside a <code><vector></code> XML element.</p> 103 104<p>The following example defines a vector image with the shape of a heart:</p> 105 106<pre> 107<!-- res/drawable/heart.xml --> 108<vector xmlns:android="http://schemas.android.com/apk/res/android" 109 <!-- intrinsic size of the drawable --> 110 android:height="256dp" 111 android:width="256dp" 112 <!-- size of the virtual canvas --> 113 android:viewportWidth="32" 114 android:viewportHeight="32"> 115 116 <!-- draw a path --> 117 <path android:fillColor="#8fff" 118 android:pathData="M20.5,9.5 119 c-1.955,0,-3.83,1.268,-4.5,3 120 c-0.67,-1.732,-2.547,-3,-4.5,-3 121 C8.957,9.5,7,11.432,7,14 122 c0,3.53,3.793,6.257,9,11.5 123 c5.207,-5.242,9,-7.97,9,-11.5 124 C25,11.432,23.043,9.5,20.5,9.5z" /> 125</vector> 126</pre> 127 128<p>Vector images are represented in Android as {@link android.graphics.drawable.VectorDrawable} 129objects. For more information about the <code>pathData</code> syntax, see the <a 130href="http://www.w3.org/TR/SVG11/paths.html#PathData">SVG Path reference</a>. For more information 131about animating the properties of vector drawables, see 132<a href="{@docRoot}training/material/animations.html#AnimVector">Animating Vector Drawables</a>.</p> 133