1 page.title=Receiving Content from Other Apps 2 parent.title=Sharing Content 3 parent.link=index.html 4 5 trainingnavtop=true 6 previous.title=Sending Content to Other Apps 7 previous.link=send.html 8 next.title=Adding an Easy Share Action 9 next.link=shareaction.html 10 11 @jd:body 12 13 <div id="tb-wrapper"> 14 <div id="tb"> 15 16 <!-- table of contents --> 17 <h2>This lesson teaches you to</h2> 18 <ol> 19 <li><a href="#update-manifest">Update Your Manifest</a></li> 20 <li><a href="#handling-content">Handle the Incoming Content</a></li> 21 </ol> 22 23 <!-- other docs (NOT javadocs) --> 24 <h2>You should also read</h2> 25 <ul> 26 <li><a href="{@docRoot}guide/topics/intents/intents-filters.html">Intents and 27 Intent Filters</a></li> 28 </ul> 29 30 </div> 31 </div> 32 33 <p>Just as your application can send data to other applications, so too can it easily receive data 34 from applications. Think about how users interact with your application, and what data types you 35 want to receive from other applications. For example, a social networking application would likely 36 be interested in receiving text content, like an interesting web URL, from another app. The 37 <a href="https://play.google.com/store/details?id=com.google.android.apps.plus">Google+ Android 38 application</a> 39 accepts both text <em>and</em> single or multiple images. With this app, a user can easily start a 40 new Google+ post with photos from the Android Gallery app.</p> 41 42 43 <h2 id="update-manifest">Update Your Manifest</h2> 44 45 <p>Intent filters inform the system what intents an application component is willing to accept. 46 Similar to how you constructed an intent with action {@link android.content.Intent#ACTION_SEND} in 47 the <a href="{@docRoot}training/sharing/send.html">Send Content to Other Apps Using Intents</a> 48 lesson, you create intent filters in order to be able to receive intents with this action. You 49 define an intent filter in your manifest, using the 50 <code><a 51 href="{@docRoot}guide/topics/intents/intents-filters.html#ifs"><intent-filter></a></code> 52 element. For example, if your application handles receiving text content, a single image of any 53 type, or multiple images of any type, your manifest would look like:</p> 54 55 <pre> 56 <activity android:name=".ui.MyActivity" > 57 <intent-filter> 58 <action android:name="android.intent.action.SEND" /> 59 <category android:name="android.intent.category.DEFAULT" /> 60 <data android:mimeType="image/*" /> 61 </intent-filter> 62 <intent-filter> 63 <action android:name="android.intent.action.SEND" /> 64 <category android:name="android.intent.category.DEFAULT" /> 65 <data android:mimeType="text/plain" /> 66 </intent-filter> 67 <intent-filter> 68 <action android:name="android.intent.action.SEND_MULTIPLE" /> 69 <category android:name="android.intent.category.DEFAULT" /> 70 <data android:mimeType="image/*" /> 71 </intent-filter> 72 </activity> 73 </pre> 74 75 <p class="note"><strong>Note:</strong> For more information on intent filters and intent resolution 76 please read <a href="{@docRoot}guide/topics/intents/intents-filters.html#ifs">Intents and Intent 77 Filters</a></p> 78 79 <p>When another application tries to share any of these things by constructing an intent and passing 80 it to {@link android.content.Context#startActivity(android.content.Intent) startActivity()}, your 81 application will be listed as an option in the intent chooser. If the user selects your application, 82 the corresponding activity (<code>.ui.MyActivity</code> in the example above) will be started. It 83 is then up to you to handle the content appropriately within your code and UI.</p> 84 85 86 <h2 id="handling-content">Handle the Incoming Content</h2> 87 88 <p>To handle the content delivered by an {@link android.content.Intent}, start by calling {@link 89 android.content.Intent#getIntent(String) getIntent()} 90 to get {@link android.content.Intent} object. Once you have the object, you can examine its 91 contents to determine what to do next. Keep in mind that if this activity can be started from other 92 parts of the system, such as the launcher, then you will need to take this into consideration when 93 examining the intent.</p> 94 95 <pre> 96 void onCreate (Bundle savedInstanceState) { 97 ... 98 // Get intent, action and MIME type 99 Intent intent = getIntent(); 100 String action = intent.getAction(); 101 String type = intent.getType(); 102 103 if (Intent.ACTION_SEND.equals(action) && type != null) { 104 if ("text/plain".equals(type)) { 105 handleSendText(intent); // Handle text being sent 106 } else if (type.startsWith("image/")) { 107 handleSendImage(intent); // Handle single image being sent 108 } 109 } else if (Intent.ACTION_SEND_MULTIPLE.equals(action) && type != null) { 110 if (type.startsWith("image/")) { 111 handleSendMultipleImages(intent); // Handle multiple images being sent 112 } 113 } else { 114 // Handle other intents, such as being started from the home screen 115 } 116 ... 117 } 118 119 void handleSendText(Intent intent) { 120 String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT); 121 if (sharedText != null) { 122 // Update UI to reflect text being shared 123 } 124 } 125 126 void handleSendImage(Intent intent) { 127 Uri imageUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM); 128 if (imageUri != null) { 129 // Update UI to reflect image being shared 130 } 131 } 132 133 void handleSendMultipleImages(Intent intent) { 134 ArrayList<Uri> imageUris = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM); 135 if (imageUris != null) { 136 // Update UI to reflect multiple images being shared 137 } 138 } 139 </pre> 140 141 <p class="caution"><strong>Caution:</strong> Take extra care to check the incoming data, you never 142 know what some other application may send you. For example, the wrong MIME type might be set, or the 143 image being sent might be extremely large. Also, remember to process binary data in a separate 144 thread rather than the main ("UI") thread.</p> 145 146 <p>Updating the UI can be as simple as populating an {@link android.widget.EditText}, or it can 147 be more complicated like applying an interesting photo filter to an image. It's really specific 148 to your application what happens next.</p> 149 150
