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安卓 : Webcam Error in WebView (Camera Permission not working)

转载 作者:行者123 更新时间:2023-12-03 15:42:30 32 4
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我已经创建了 WebView Activity 并加载了 https://web.doar.zone/coronavirus

这个 URL 需要相机权限,我在 Android 中获得了运行时权限。

这是的完整代码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);
}
}
}
}

现在我收到如下错误当我评论这一行时:
request.grant(request.getResources());

enter image description here

如果我取消注释这一行,那么我会得到:
 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)

有什么帮助吗?

最佳答案

您已经处理了 android 操作系统的运行时相机权限。我们还需要在 webview 中授予相机权限 (RESOURCE_VIDEO_CAPTURE)。

首先调用以下方法打开相机,无需用户手势:

binding.webView.getSettings().setMediaPlaybackRequiresUserGesture(false);

调用 request.grant(request.getResources())像这样的方法将授予所有请求的权限。
为避免这种情况,您应该只授予您需要的权限,即 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;
}
}
}

在您的代码中,这一行导致了问题: super.onPermissionRequest(request);这个 super 方法调用拒绝了权限。

关于安卓 : Webcam Error in WebView (Camera Permission not working),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61495505/

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