95 lines
3.6 KiB
Markdown
95 lines
3.6 KiB
Markdown
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Android PermissionRequest Sample
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===================================
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This sample demonstrates how to use the PermissionRequest API to
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securely provide access to restricted system features (such as a
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camera or microphone) from within a WebView. In this example, a dialog
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is created to allow users to explicitly approve or reject each
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request.
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Introduction
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------------
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PermissionRequest can be used by setting up a custom WebChromeClient.
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```java
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mWebView.setWebChromeClient(mWebChromeClient);
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```
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In you WebChromeClient implementation, you need to override
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[onPermissionRequest][1]. This method is called when the web content
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is requesting permission to access some resources, providing an
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opportunity to approve or reject the request. In this implementation,
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we display a dialog to allow the user to approve or reject any
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request. In other applications, you may want to implement a whitelist
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of allowed APIs. Also, override [onPermissionRequestCanceled][2] for
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handling cancellation of the PermissionRequest by the web content.
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When the user confirms or denies the request, you can respond back to
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the web content by [grant][3] or [deny][4] respectively.
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```java
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mPermissionRequest.grant(mPermissionRequest.getResources());
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```
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This sample provides the web content from the assets folder in the
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app. Since WebView is not allowed to use getUserMedia from a "file://"
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URL, the app uses the SimpleWebServer class to provide the content via
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"http://localhost".
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[1]: http://developer.android.com/reference/android/webkit/WebChromeClient.html#onPermissionRequest(android.webkit.PermissionRequest)
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[2]: http://developer.android.com/reference/android/webkit/WebChromeClient.html#onPermissionRequestCanceled(android.webkit.PermissionRequest)
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[3]: http://developer.android.com/reference/android/webkit/PermissionRequest.html#grant(java.lang.String[])
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[4]: http://developer.android.com/reference/android/webkit/PermissionRequest.html#deny()
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Pre-requisites
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--------------
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- Android SDK 27
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- Android Build Tools v27.0.2
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- Android Support Repository
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Screenshots
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-------------
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<img src="screenshots/image1.png" height="400" alt="Screenshot"/> <img src="screenshots/image2.png" height="400" alt="Screenshot"/>
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Getting Started
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---------------
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This sample uses the Gradle build system. To build this project, use the
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"gradlew build" command or use "Import Project" in Android Studio.
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Support
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-------
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- Google+ Community: https://plus.google.com/communities/105153134372062985968
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- Stack Overflow: http://stackoverflow.com/questions/tagged/android
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If you've found an error in this sample, please file an issue:
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https://github.com/googlesamples/android-PermissionRequest
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Patches are encouraged, and may be submitted by forking this project and
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submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
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License
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-------
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Copyright 2017 The Android Open Source Project, Inc.
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Licensed to the Apache Software Foundation (ASF) under one or more contributor
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license agreements. See the NOTICE file distributed with this work for
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additional information regarding copyright ownership. The ASF licenses this
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file to you under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy of
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the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations under
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the License.
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