Android:WebView中的网络摄像头错误(相机权限不起作用) [英] Android : Webcam Error in WebView (Camera Permission not working)
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问题描述
我已经创建了WebView活动并加载
如果我取消注释此行，那么我会得到:
java.lang.IllegalStateException:已经调用了grant()或deny().在org.chromium.android_webview.permission.AwPermissionRequest.c(PG:3)在org.chromium.android_webview.permission.AwPermissionRequest.b(PG:1)在Cn.grant(PG:8)在com.example.webviewapp.MainActivity $ MyWebChromeClient.onPermissionRequest(MainActivity.java:164)在org.chromium.android_webview.AwContents.onPermissionRequest(PG:8)在android.os.MessageQueue.nativePollOnce(本机方法)在android.os.MessageQueue.next(MessageQueue.java:326)在android.os.Looper.loop(Looper.java:181)在android.app.ActivityThread.main(ActivityThread.java:7078)2020-04-29 11:52:21.813 4943-4943/com.example.webviewapp W/System.err:at java.lang.reflect.Method.invoke(本机方法)在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run(RuntimeInit.java:494) 有帮助吗?
解决方案
您已经处理了android os的运行时Camera权限.我们还需要在网络视图内授予摄像头权限( RESOURCE_VIDEO_CAPTURE ).
首先调用以下方法打开相机而无需用户手势:
binding.webView.getSettings().setMediaPlaybackRequiresUserGesture(false); 像这样调用 request.grant(request.getResources())方法将授予所有请求的权限.为避免这种情况，您只应授予所需的权限，即 RESOURCE_VIDEO_CAPTURE :
@Override公共无效onPermissionRequest(最终PermissionRequest请求){最后的String [] requestResources = request.getResources();对于(字符串r:requestedResources){如果(r.equals(PermissionRequest.RESOURCE_VIDEO_CAPTURE)){request.grant(new String [] {PermissionRequest.RESOURCE_VIDEO_CAPTURE});休息;}}} 在您的代码中，此行引起了问题: super.onPermissionRequest(request); 此超级方法调用拒绝该权限.
I have created WebView Activity and loading https://web.doar.zone/coronavirus
This URL required Camera permission which I had taken Runtime Permission in Android.
Here is the full code of MainActivity.java:
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
Context context;
ActivityMainBinding binding;
private String url = "https://web.doar.zone/coronavirus";
@Override
protected void onResume() {
super.onResume();
checkCameraPermission();
}
private void checkCameraPermission() {
int writeExternalStorage = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA);
if (writeExternalStorage != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 1001);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1001) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//Do your stuff
openWebView();
} else {
checkCameraPermission();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
context = getApplicationContext();
openWebView();
}
@SuppressLint("SetJavaScriptEnabled")
void openWebView() {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo networkInfo;
if (connectivityManager != null) {
networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnectedOrConnecting()) {
binding.internetTextView.setVisibility(View.INVISIBLE);
binding.webView.setVisibility(View.VISIBLE);
//binding.webView.getSettings().setUserAgentString("Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.3");
binding.webView.getSettings().setJavaScriptEnabled(true);
binding.webView.getSettings().setUseWideViewPort(true);
binding.webView.getSettings().setDomStorageEnabled(true);
binding.webView.setInitialScale(1);
binding.webView.setWebChromeClient(new MyWebChromeClient());
binding.webView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView webview, String url) {
Uri uri = Uri.parse(url);
if (uri.getScheme().contains("whatsapp") || uri.getScheme().contains("tel")) {
try {
Intent intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
if (intent.resolveActivity(getPackageManager()) != null)
startActivity(intent);
return true;
} catch (URISyntaxException use) {
Log.e("TAG", use.getMessage());
}
} else {
webview.loadUrl(url);
}
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
});
binding.webView.loadUrl(url);
} else {
binding.internetTextView.setVisibility(View.VISIBLE);
binding.buttonTryAgain.setVisibility(View.VISIBLE);
binding.webView.setVisibility(View.INVISIBLE);
Toast.makeText(context, "Connect to Internet and Refresh Again", Toast.LENGTH_LONG).show();
}
} else {
binding.internetTextView.setVisibility(View.VISIBLE);
binding.buttonTryAgain.setVisibility(View.VISIBLE);
binding.webView.setVisibility(View.INVISIBLE);
Toast.makeText(context, "Connect to Internet and Refresh Again", Toast.LENGTH_LONG).show();
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (binding.webView.canGoBack()) {
binding.webView.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
class MyWebChromeClient extends WebChromeClient {
MyWebChromeClient() {
// TODO Auto-generated constructor stub
binding.pb.setProgress(0);
}
@Override
public void onPermissionRequest(final PermissionRequest request) {
super.onPermissionRequest(request);
//request.grant(request.getResources());
}
public void onProgressChanged(WebView view, int progress) {
if (progress < 100 /* && pBar.getVisibility() == View.VISIBLE*/) {
binding.pb.setVisibility(View.VISIBLE);
}
binding.pb.setProgress(progress);
if (progress == 100) {
binding.pb.setVisibility(View.GONE);
}
}
}
}
Now I am getting error as below When I comment this line:
request.grant(request.getResources());
And If I uncomment this line then I am getting:
java.lang.IllegalStateException: Either grant() or deny() has been already called.
at org.chromium.android_webview.permission.AwPermissionRequest.c(PG:3)
at org.chromium.android_webview.permission.AwPermissionRequest.b(PG:1)
at Cn.grant(PG:8)
at com.example.webviewapp.MainActivity$MyWebChromeClient.onPermissionRequest(MainActivity.java:164)
at org.chromium.android_webview.AwContents.onPermissionRequest(PG:8)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:326)
at android.os.Looper.loop(Looper.java:181)
at android.app.ActivityThread.main(ActivityThread.java:7078)
2020-04-29 11:52:21.813 4943-4943/com.example.webviewapp W/System.err: at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
Any Help?
解决方案
You've already handled runtime Camera permission of android os. We need to grant camera permission (RESOURCE_VIDEO_CAPTURE) inside webview also.
First call below method to open camera without user gesture:
binding.webView.getSettings().setMediaPlaybackRequiresUserGesture(false);
Calling request.grant(request.getResources()) method like this will grant all requested permission.
To avoid that you should only grant permission which you need which is RESOURCE_VIDEO_CAPTURE:
@Override
public void onPermissionRequest(final PermissionRequest request) {
final String[] requestedResources = request.getResources();
for (String r : requestedResources) {
if (r.equals(PermissionRequest.RESOURCE_VIDEO_CAPTURE)) {
request.grant(new String[]{PermissionRequest.RESOURCE_VIDEO_CAPTURE});
break;
}
}
}
In your code this line was causing the issue: super.onPermissionRequest(request); this super method call denies the permission.
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