Zugriff auf die Kamera über Android WebView (Chrome Frame) im Kontext von webRTC

Question

App basiert auf WebRTC vs Websocket. Android Studio 2.3.2 letzte Version.

ich bereits verwenden:

https-Protokoll, automatische Wiedergabe, Android-Version 7.0 (min> Android 5.0). App funktioniert auf allen unterstützten Browsern nur android webview Fehler erzeugen.

Dies ist in erster Linie von Fehlern melden Sie sich an logcat (android Studio letztes ver):

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)

Andere Variante für Fehler:

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

Dies ist Fehlerprotokoll aus Chrom/webview (von errorCallBack - getUserMedia):

 An error occcurred [CODE NotAllowedError] 

     other error variant : 

     trackstarterror 

Android-Code wie folgt aussieht:

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-Projekt:

// 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 - Modula:

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' 
} 

Android Manifest.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" /> 

... 

Answer 1

Ihre Anwendung benötigen die Erlaubnis ersuchen, vor dem Gebrauch der Kamera

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

Answer 2

Die WebView Anfragen Genehmigung der App, aber die App ist nicht diese Berechtigungen vom Benutzer erteilt.

Sie sollten die Berechtigungsanfrage von App an den Benutzer aufrufen, wie in this document erwähnt.

Nun fand ich, dass die Berechtigungen WebRTC diejenigen sind erforderlich:

onPermissionRequest: android.webkit.resource.VIDEO_CAPTURE 
onPermissionRequest: android.webkit.resource.AUDIO_CAPTURE