Moodle "upload" button of my site doesn't function inside android webview - android-webview

Question

I am developing an android application. I have used webview to load my moodle site; everything is fine but the "upload" button doe not function! When for example I click on the "upload" button to upload my photo in profile of moodle, nothing happens.
I have included the following in the manifest file:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<!--
Allows Glide to monitor connectivity status and restart failed requests if users go from a disconnected to a connected network state.
-->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
And the following lines have been added to the MainActivity:
<if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
int hasCameraPermission =
checkSelfPermission(Manifest.permission.CAMERA);
Log.d(TAG, "has camera permission: " + hasCameraPermission);
int hasRecordPermission =
checkSelfPermission(Manifest.permission.RECORD_AUDIO);
Log.d(TAG, "has record permission: " + hasRecordPermission);
int hasAudioPermission =
checkSelfPermission(Manifest.permission.MODIFY_AUDIO_SETTINGS);
Log.d(TAG, "has audio permission: " + hasAudioPermission);
List<String> permissions = new ArrayList<>();
if (hasCameraPermission != PackageManager.PERMISSION_GRANTED) {
permissions.add(Manifest.permission.CAMERA);
}
if (hasRecordPermission != PackageManager.PERMISSION_GRANTED) {
permissions.add(Manifest.permission.RECORD_AUDIO);
}
if (hasAudioPermission != PackageManager.PERMISSION_GRANTED) {
permissions.add(Manifest.permission.MODIFY_AUDIO_SETTINGS);
}
if (!permissions.isEmpty()) {
requestPermissions(permissions.toArray(new
String[permissions.size()]),111);
}
}
The following were also added to the webView activity:
wvs.setWebChromeClient(new WebChromeClient() {
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
#Override
public void onPermissionRequest(final PermissionRequest request) {
SiteActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
request.grant(request.getResources());
}
});
}
#Override
public void onPermissionRequestCanceled(PermissionRequest
request) {
// The following line was underlined red so I commented it out!
//Log.d(TAG, "onPermissionRequestCanceled");
}
});
After adding the above lines, when I run the app, I am asked to give permission but then a white page opens in webview and nothing happens!
Also, recording audio and video does not function inside the moodle site running in a webview! This may also help to find out the issue!
Would you please help me to eliminate the problem.
I highly appreciate your help.
Faramarz