1<?xml version="1.0" encoding="UTF-8"?>
2<!--
3 Copyright 2014 The Android Open Source Project
4
5 Licensed under the Apache License, Version 2.0 (the "License");
6 you may not use this file except in compliance with the License.
7 You may obtain a copy of the License at
8
9     http://www.apache.org/licenses/LICENSE-2.0
10
11 Unless required by applicable law or agreed to in writing, software
12 distributed under the License is distributed on an "AS IS" BASIS,
13 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 See the License for the specific language governing permissions and
15 limitations under the License.
16-->
17<sample>
18    <name>PermissionRequest</name>
19    <group>Content</group>
20    <package>com.example.android.permissionrequest</package>
21
22    <minSdk>21</minSdk>
23
24    <strings>
25        <intro>
26            <![CDATA[
27            This sample shows how to handle PermissionRequest coming from web apps inside of a
28            WebView.
29            ]]>
30        </intro>
31    </strings>
32
33    <template src="base"/>
34    <template src="FragmentView"/>
35    <common src="logger"/>
36    <common src="activities"/>
37
38    <metadata>
39        <status>PUBLISHED</status>
40        <categories>Content</categories>
41        <technologies>Android</technologies>
42        <languages>Java</languages>
43        <solutions>Mobile</solutions>
44        <level>INTERMEDIATE</level>
45        <icon>screenshots/icon_web.png</icon>
46        <screenshots>
47            <img>screenshots/image1.png</img>
48            <img>screenshots/image2.png</img>
49        </screenshots>
50        <api_refs>
51            <android>android.webkit.PermissionRequest</android>
52            <android>android.webkit.WebView</android>
53            <android>android.webkit.WebChromeClient</android>
54        </api_refs>
55
56        <description>
57<![CDATA[
58This sample demonstrates how to use the PermissionRequest API to
59securely provide access to restricted system features (such as a
60camera or microphone) from within a WebView. In this example, a dialog
61is created to allow users to explicitly approve or reject each
62request.
63]]>
64        </description>
65
66        <intro>
67<![CDATA[
68PermissionRequest can be used by setting up a custom WebChromeClient.
69
70```java
71mWebView.setWebChromeClient(mWebChromeClient);
72```
73
74In you WebChromeClient implementation, you need to override
75[onPermissionRequest][1]. This method is called when the web content
76is requesting permission to access some resources, providing an
77opportunity to approve or reject the request. In this implementation,
78we display a dialog to allow the user to approve or reject any
79request. In other applications, you may want to implement a whitelist
80of allowed APIs.  Also, override [onPermissionRequestCanceled][2] for
81handling cancellation of the PermissionRequest by the web content.
82
83When the user confirms or denies the request, you can respond back to
84the web content by [grant][3] or [deny][4] respectively.
85
86```java
87mPermissionRequest.grant(mPermissionRequest.getResources());
88```
89
90This sample provides the web content from the assets folder in the
91app. Since WebView is not allowed to use getUserMedia from a "file://"
92URL, the app uses the SimpleWebServer class to provide the content via
93"http://localhost".
94
95[1]: http://developer.android.com/reference/android/webkit/WebChromeClient.html#onPermissionRequest(android.webkit.PermissionRequest)
96[2]: http://developer.android.com/reference/android/webkit/WebChromeClient.html#onPermissionRequestCanceled(android.webkit.PermissionRequest)
97[3]: http://developer.android.com/reference/android/webkit/PermissionRequest.html#grant(java.lang.String[])
98[4]: http://developer.android.com/reference/android/webkit/PermissionRequest.html#deny()
99]]>
100        </intro>
101    </metadata>
102
103</sample>
104