1page.title=Printing Photos
2parent.title=Printing Content
3parent.link=index.html
4
5trainingnavtop=true
6next.title=Printing HTML Documents
7next.link=html-docs.html
8
9@jd:body
10
11<div id="tb-wrapper">
12<div id="tb">
13
14<h2>This lesson teaches you to</h2>
15<ol>
16  <li><a href="#image">Print an Image</a></li>
17</ol>
18
19</div>
20</div>
21
22<p>
23  Taking and sharing photos is one of the most popular uses for mobile devices. If your application
24  takes photos, displays them, or allows users to share images, you should consider enabling printing
25  of those images in your application. The <a href="{@docRoot}tools/support-library/index.html"
26  >Android Support Library</a> provides a convenient function for enabling image printing using a
27  minimal amount of code and simple set of print layout options.
28</p>
29
30<p>This lesson shows you how to print an image using the v4 support library {@link
31  android.support.v4.print.PrintHelper} class.</p>
32
33
34<h2 id="image">Print an Image</h2>
35
36<p>The Android Support Library {@link android.support.v4.print.PrintHelper} class provides
37  a simple way to print of images. The class has a single layout option, {@link
38  android.support.v4.print.PrintHelper#setScaleMode setScaleMode()}, which allows you to print with
39  one of two options:</p>
40
41<ul>
42  <li>{@link android.support.v4.print.PrintHelper#SCALE_MODE_FIT SCALE_MODE_FIT} - This
43    option sizes the image so that the whole image is shown within the printable area of the page.
44    </li>
45  <li>{@link android.support.v4.print.PrintHelper#SCALE_MODE_FILL SCALE_MODE_FILL} - This
46    option scales the image so that it fills the entire printable area of the page. Choosing this
47    setting means that some portion of the top and bottom, or left and right edges of the image is
48    not printed. This option is the default value if you do not set a scale mode.</li>
49</ul>
50
51<p>Both scaling options for {@link android.support.v4.print.PrintHelper#setScaleMode
52  setScaleMode()} keep the existing aspect ratio of the image intact. The following code example
53  shows how to create an instance of the {@link android.support.v4.print.PrintHelper} class, set the
54  scaling option, and start the printing process:</p>
55
56<pre>
57private void doPhotoPrint() {
58    PrintHelper photoPrinter = new PrintHelper(getActivity());
59    photoPrinter.setScaleMode(PrintHelper.SCALE_MODE_FIT);
60    Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
61            R.drawable.droids);
62    photoPrinter.printBitmap("droids.jpg - test print", bitmap);
63}
64</pre>
65
66<p>
67  This method can be called as the action for a menu item. Note that menu items for actions that are
68  not always supported (such as printing) should be placed in the overflow menu. For more
69  information, see the <a href="{@docRoot}design/patterns/actionbar.html">Action Bar</a> design
70  guide.
71</p>
72
73<p>After the {@link android.support.v4.print.PrintHelper#printBitmap printBitmap()} method is
74  called, no further action from your application is required. The Android print user interface
75  appears, allowing the user to select a printer and printing options. The user can then print the
76  image or cancel the action. If the user chooses to print the image, a print job is created and a
77  printing notification appears in the system bar.</p>
78
79<p>If you want to include additional content in your printouts beyond just an image, you must
80  construct a print document. For information on creating documents for printing, see the
81  <a href="html-docs.html">Printing an HTML Document</a> or
82  <a href="custom-docs.html">Printing a Custom Document</a>
83  lessons.</p>
84
85