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无法在webRTC上下文中从Android webView（chrome框架）访问相机

google-chromeandroid-webviewwebrtc
10

应用程序基于webRTC与websocket技术。Android Studio 2.3.2是最新版本。

我已经使用了：

https协议、自动播放、Android版本7.0（最低要求Android 5.0）。 应用程序可以在所有支持的浏览器上运行，只有Android WebView会生成错误。

这是在Logcat（Android Studio最新版本）中的错误日志的前几行：

E/chromium: [ERROR:audio_manager_android.cc(264)] Unable to select audio device! E/cr_VideoCapture: allocate: manager.openCamera: SecurityException: validateConnectLocked:1112: Caller "com.testwebrtc.nikola.myapplication" cannot open camera "1" without camera permission at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:628) at android.hardware.camera2.CameraManager.openCameraDeviceUserAsync(CameraManager.java:347) at android.hardware.camera2.CameraManager.openCamera(CameraManager.java:450) at org.chromium.media.VideoCaptureCamera2.startCapture(VideoCaptureCamera2.java:661)

其他错误变体：

[ERROR:web_contents_delegate.cc(199)] WebContentsDelegate::CheckMediaAccessPermission: Not supported.

这是来自Chrome/Webview的错误日志（从errorCallBack - getUserMedia）：

      An error occcurred [CODE NotAllowedError]

      other error variant: 

      trackstarterror

Android代码的外观如下：

package com.project.TEST.xxx;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Context;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.CookieManager;
import android.webkit.PermissionRequest;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                .replace(R.id.container, PlaceholderFragment.newInstance(1) )
                .commit();

    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";

        /**
         * Returns a new instance of this fragment for the given section
         * number.
         */
        public static PlaceholderFragment newInstance(int sectionNumber) {
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putInt(ARG_SECTION_NUMBER, sectionNumber);
            fragment.setArguments(args);
            return fragment;
        }

        private WebView mWebRTCWebView;

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            mWebRTCWebView = (WebView) rootView.findViewById(R.id.fragment_main_webview);

            setUpWebViewDefaults(mWebRTCWebView);

            mWebRTCWebView.loadUrl("https://example.com/");

            mWebRTCWebView.setWebChromeClient(new WebChromeClient() {

                @Override
                public void onPermissionRequest(final PermissionRequest request) {
                    Log.d(TAG, "onPermissionRequest");
                    getActivity().runOnUiThread(new Runnable() {
                        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
                        @Override
                        public void run() {

                            request.grant(request.getResources());

                        }
                    });
                }

            });

            return rootView;
        }

        @Override
        public void onStop() {
            super.onStop();

            /**
             * When the application falls into the background we want to stop the media stream
             * such that the camera is free to use by other apps.
             */
            mWebRTCWebView.evaluateJavascript("if(window.localStream){window.localStream.stop();}", null);
        }

        /*
        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
            ((MainActivity) activity).onSectionAttached(
                    getArguments().getInt(ARG_SECTION_NUMBER));
        }
*/

        @Override
        public void onAttach(Context context) {
            super.onAttach(context);

            Activity a;

            if (context instanceof Activity){
                a=(Activity) context;

            }

        }

        /**
         * Convenience method to set some generic defaults for a
         * given WebView
         *
         * @param webView
         */
        @TargetApi(Build.VERSION_CODES.LOLLIPOP)
        private void setUpWebViewDefaults(WebView webView) {
            WebSettings settings = webView.getSettings();

            // Enable Javascript
            settings.setJavaScriptEnabled(true);

            // Use WideViewport and Zoom out if there is no viewport defined
            settings.setUseWideViewPort(true);
            settings.setLoadWithOverviewMode(true);

            // Enable pinch to zoom without the zoom buttons
            settings.setBuiltInZoomControls(true);

            // Allow use of Local Storage
            settings.setDomStorageEnabled(true);

            if(Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB) {
                // Hide the zoom controls for HONEYCOMB+
                settings.setDisplayZoomControls(false);
            }

            // Enable remote debugging via chrome://inspect
            if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                WebView.setWebContentsDebuggingEnabled(true);
            }

            webView.setWebViewClient(new WebViewClient());

            // AppRTC requires third party cookies to work
            CookieManager cookieManager = CookieManager.getInstance();
            cookieManager.setAcceptThirdPartyCookies(mWebRTCWebView, true);
        }
    }


}

Build.gradle 项目:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.2'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Gradle - 模块：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "com.project.test.xxx"
        minSdkVersion 21
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags "-fexceptions"
            }
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}

AndroidManifest.xml：

....
  <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.CAPTURE_SECURE_VIDEO_OUTPUT" />
    <uses-permission android:name="android.permission.CAPTURE_VIDEO_OUTPUT" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />

    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
    <uses-permission android:name="android.permission.CAPTURE_AUDIO_OUTPUT" />
    <uses-feature android:name="android.hardware.camera.autofocus" android:required="true" />
    <uses-feature android:name="android.hardware.camera.front" android:required="true" />
    <uses-feature android:name="android.hardware.camera" android:required="true" />
    <uses-feature android:name="android.hardware.camera.level.full" android:required="true" />
    <uses-feature android:name="android.hardware.camera.capability.raw" android:required="true" />
    <uses-feature android:name="android.hardware.camera.any" android:required="true" />
    <uses-feature android:name="android.hardware.microphone" android:required="true" />
    <uses-feature android:name="android.hardware.camera2" android:required="true" />

...
1
你可以分享涉及到webView的全部代码吗？比如在下面提供的代码里找不到setWebViewClient的调用。 - Siarhei
我制作了副本，看起来一样...关于目标和其他版本设置的事情，我仍然是Android平台的先驱者... - Nikola Lukic
@user5599807 我目前的最佳成绩是：我已经在Webview上获取了远程流，并成功通过了getUserMedia。但是本地视频预览仍然是黑屏状态... - Nikola Lukic
嗨，抱歉上次我太忙了。你有处理那个ID吗？ - Siarhei
2
嗨，我今天刚接触到这个。你找到解决方案了吗？:) 谢谢 - VinceOPS
显示剩余2条评论
5个回答
11

以这种方式授予权限：

yourWebView.setWebChromeClient(new WebChromeClient() {
                @Override
                public void onPermissionRequest(PermissionRequest request) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                        request.grant(request.getResources());
                    }
                }
            });
1
非常好的回答，这节省了很多工作，谢谢 :) @Amos - Gundu Bandgar
1
由于时间紧迫，我将接受这个答案。这可能是正确的答案。在某一时刻（可能是7.0），权限是严格定义的（您需要使用授权调用来请求用户）。 - Nikola Lukic
4
从文档角度来看，这是错误的。为避免无意中授予新权限的请求，应该将您打算授予的特定权限传递给grant()，并避免编写像此示例一样的代码：permissionRequest.grant(permissionRequest.getResources()) // 这是错误的！！！ - Dmitrijs
1
你只能授予所需域名的资源。例如： if (request.origin.toString() == "https://$httpServerDomain/") { request.grant(request.resources) } else { request.deny() } - G33k Labs
这会有所帮助 - @Dmitrijs 提到你可以根据文档尝试 这个 方法。 - Adarsh Vijayan P
5
WebView 请求应用程序的权限，但用户未授予该应用程序这些权限。您应该按照此文档中提到的方法请求用户授权应用程序权限。现在我发现 WebRTC 需要以下权限：
onPermissionRequest: android.webkit.resource.VIDEO_CAPTURE
onPermissionRequest: android.webkit.resource.AUDIO_CAPTURE
2
欢迎来到 Stack Overflow。在提供答案时，最好全面解释您的解决方案，并尽可能提供示例。如果需要，链接文档作为支持答案的参考是不错的，但仅靠链接是不够的。 - Matt
我会尝试，这非常有可能。 - Nikola Lukic
3

在使用相机之前，您的应用程序需要请求权限。

 <uses-permission android:name="android.permission.CAMERA" />
 <uses-feature android:name="android.hardware.camera" />
 <uses-feature android:name="android.hardware.camera.autofocus" />
1
谢谢您的回答，但我已经为相机、相机2、麦克风等做了这个。 - Nikola Lukic
1

您需要这些权限才能访问相机和麦克风

<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" android:required="true"/>
<uses-feature android:name="android.hardware.camera.autofocus"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />

// don't miss this one
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />

接下来，您需要授予您的Webview权限，请查看此link以获取更多详细信息：

webView.setWebChromeClient(new WebChromeClient(){
        @Override
        public void onPermissionRequest(PermissionRequest request) {
            runOnUiThread(() -> {
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                    String[] PERMISSIONS = {
                            PermissionRequest.RESOURCE_AUDIO_CAPTURE,
                            PermissionRequest.RESOURCE_VIDEO_CAPTURE
                    };
                    request.grant(PERMISSIONS);
                }
            });
        }
    });

如果音频无法播放，请使用以下内容：
webView.getSettings().setMediaPlaybackRequiresUserGesture(false);
1

在重新加载Webview时遇到了一些问题，经过大量研究，找到了以下代码并创建了以下代码：

 mwebView.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onPermissionRequest(final PermissionRequest request) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            myRequest = request;
            for (String permission : request.getResources()) {
                if (permission.equals("android.webkit.resource.AUDIO_CAPTURE")) {
                    demandForPermission(request.getOrigin().toString(), Manifest.permission.RECORD_AUDIO, MY_PERMISSIONS_REQUEST_RECORD_AUDIO);
                } else {
                    myRequest.grant(request.getResources());
                }
            }
        }
    }

    @Override
    public void onPermissionRequestCanceled(PermissionRequest request) {
        super.onPermissionRequestCanceled(request);
    }

更多信息请查看此页面Android Webview

总是很好让更多的Android设备处于工作状态。感谢LOLLIPOP检查。欢迎加入社区！ - Nikola Lukic
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