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android webview geolocation

Posted by: admin March 11, 2020 Leave a comment

Questions:

I have to retrieve a user’s location in a WebView. I do this with the following Javascript:

function getLocation() {
   navigator.geolocation.getCurrentPosition(displayLocation, handleError);
}

But the permission request popup never opens.

I’ve set these settings:

ws.setJavaScriptEnabled(true);
ws.setGeolocationEnabled(true);
ws.setJavaScriptCanOpenWindowsAutomatically(true);

What is the correct way to access a user’s location from within a WebView?

How to&Answers:
  • JavaScript must be enabled in the WebView, using WebSettings.setJavaScriptEnabled(true);
  • The app needs permission ACCESS_FINE_LOCATION
  • The WebView must use a custom WebChromeClient which implements WebChromeClient.onGeolocationPermissionsShowPrompt(). This method
    is called by the WebView to obtain permission to disclose the user’s location to JavaScript. (In the case of the browser, we show a prompt to the user.) The default implementation does nothing, so permission is never obtained and the location is never passed to JavaScript. A simple implementation which always grants permission is …

    webView.setWebChromeClient(new WebChromeClient() {
     public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
        callback.invoke(origin, true, false);
     }
    });
    

Geolocation uses databases to persist cached positions and permissions between sessions. The location of the database is set using WebSettings.setGeolocationDatabasePath(...). If the location of the database is not set, the persistent storage will not be available, but Geolocation will continue to function correctly otherwise. To set the location of the databases, use …

webView.getSettings().setGeolocationDatabasePath( context.getFilesDir().getPath() );

Answer:

Are you declaring that permission in your manifest?

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

You may also need to declare other location permissions, like these:

<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Answer:

Dialog to accept or decline user location is design by programmer :D. As Chris Cashwell said, you just use a callback like this:

webview.setWebChromeClient(new WebChromeClient(){
  public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
    // callback.invoke(String origin, boolean allow, boolean remember);
    callback.invoke(origin, true, false);
  }
}

In some cases, HTML5 require to use storage, you must enable some properties so that webview has full access to run normal.

    // HTML5 API flags
    webView.getSettings().setAppCacheEnabled(true);
    webView.getSettings().setDatabaseEnabled(true);
    webView.getSettings().setDomStorageEnabled(true);

Answer:

Sharing my Working activity class, this is a complete solution which can demonstrate

  • Showing loading dialog while the web page is loading
  • Ask for permission in marshmallow and above
  • Handle webpage error
  • Check for the internet connection and open setting page
  • Handling Geolocation permission with and without dialog

Hope, it saves someone’s time

 /** * Created by Hitesh.Sahu on 3/24/2017. */ public class WebViewActivity extends AppCompatActivity { final private int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS = 124; private int webViewPreviousState; private final int PAGE_STARTED = 0x1; private final int PAGE_REDIRECTED = 0x2; private CoordinatorLayout rootView; private WebView webView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_webview); webView = (WebView) findViewById(R.id.webView); rootView = (CoordinatorLayout) findViewById(R.id.root_view); if (Build.VERSION.SDK_INT >= 23) { // Marshmallow+ Permission APIs fuckMarshMallow(); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { if (0 != (getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE)) { WebView.setWebContentsDebuggingEnabled(true); } } webView.setInitialScale(1); webView.getSettings().setLoadWithOverviewMode(true); webView.getSettings().setUseWideViewPort(true); webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY); webView.setScrollbarFadingEnabled(false); webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true); webView.getSettings().setBuiltInZoomControls(true); webView.setWebViewClient(new GeoWebViewClient()); // Below required for geolocation webView.getSettings().setJavaScriptEnabled(true); webView.getSettings().setGeolocationEnabled(true); webView.setWebChromeClient(new GeoWebChromeClient()); webView.getSettings().setAppCacheEnabled(true); webView.getSettings().setDatabaseEnabled(true); webView.getSettings().setDomStorageEnabled(true); webView.getSettings().setGeolocationDatabasePath(getFilesDir().getPath()); webView.loadUrl("file:///android_asset/index.html"); } /** * WebChromeClient subclass handles UI-related calls * Note: think chrome as in decoration, not the Chrome browser */ public class GeoWebChromeClient extends android.webkit.WebChromeClient { @Override public void onGeolocationPermissionsShowPrompt(final String origin, final GeolocationPermissions.Callback callback) { // Always grant permission since the app itself requires location // permission and the user has therefore already granted it callback.invoke(origin, true, false); // final boolean remember = false; // AlertDialog.Builder builder = new AlertDialog.Builder(WebViewActivity.this); // builder.setTitle("Locations"); // builder.setMessage("Would like to use your Current Location ") // .setCancelable(true).setPositiveButton("Allow", new DialogInterface.OnClickListener() { // public void onClick(DialogInterface dialog, int id) { // // origin, allow, remember // callback.invoke(origin, true, remember); // } // }).setNegativeButton("Don't Allow", new DialogInterface.OnClickListener() { // public void onClick(DialogInterface dialog, int id) { // // origin, allow, remember // callback.invoke(origin, false, remember); // } // }); // AlertDialog alert = builder.create(); // alert.show(); } } /** * WebViewClient subclass loads all hyperlinks in the existing WebView */ public class GeoWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { // When user clicks a hyperlink, load in the existing WebView view.loadUrl(url); return true; } Dialog loadingDialog = new Dialog(WebViewActivity.this); @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); webViewPreviousState = PAGE_STARTED; if (loadingDialog == null || !loadingDialog.isShowing()) loadingDialog = ProgressDialog.show(WebViewActivity.this, "", "Loading Please Wait", true, true, new DialogInterface.OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { // do something } }); loadingDialog.setCancelable(false); } @RequiresApi(api = Build.VERSION_CODES.M) @Override public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) { if (isConnected()) { final Snackbar snackBar = Snackbar.make(rootView, "onReceivedError : " + error.getDescription(), Snackbar.LENGTH_INDEFINITE); snackBar.setAction("Reload", new View.OnClickListener() { @Override public void onClick(View view) { webView.loadUrl("javascript:window.location.reload( true )"); } }); snackBar.show(); } else { final Snackbar snackBar = Snackbar.make(rootView, "No Internet Connection ", Snackbar.LENGTH_INDEFINITE); snackBar.setAction("Enable Data", new View.OnClickListener() { @Override public void onClick(View view) { startActivityForResult(new Intent(Settings.ACTION_WIRELESS_SETTINGS), 0); webView.loadUrl("javascript:window.location.reload( true )"); snackBar.dismiss(); } }); snackBar.show(); } super.onReceivedError(view, request, error); } @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) { if (isConnected()) { final Snackbar snackBar = Snackbar.make(rootView, "HttpError : " + errorResponse.getReasonPhrase(), Snackbar.LENGTH_INDEFINITE); snackBar.setAction("Reload", new View.OnClickListener() { @Override public void onClick(View view) { webView.loadUrl("javascript:window.location.reload( true )"); } }); snackBar.show(); } else { final Snackbar snackBar = Snackbar.make(rootView, "No Internet Connection ", Snackbar.LENGTH_INDEFINITE); snackBar.setAction("Enable Data", new View.OnClickListener() { @Override public void onClick(View view) { startActivityForResult(new Intent(Settings.ACTION_WIRELESS_SETTINGS), 0); webView.loadUrl("javascript:window.location.reload( true )"); snackBar.dismiss(); } }); snackBar.show(); } super.onReceivedHttpError(view, request, errorResponse); } @Override public void onPageFinished(WebView view, String url) { if (webViewPreviousState == PAGE_STARTED) { if (null != loadingDialog) { loadingDialog.dismiss(); loadingDialog = null; } } } } /** * Check if there is any connectivity * * @return is Device Connected */ public boolean isConnected() { ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE); if (null != cm) { NetworkInfo info = cm.getActiveNetworkInfo(); return (info != null && info.isConnected()); } return false; } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS: { Map<String, Integer> perms = new HashMap<String, Integer>(); // Initial perms.put(Manifest.permission.ACCESS_FINE_LOCATION, PackageManager.PERMISSION_GRANTED); // Fill with results for (int i = 0; i < permissions.length; i++) perms.put(permissions[i], grantResults[i]); // Check for ACCESS_FINE_LOCATION if (perms.get(Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED ) { // All Permissions Granted // Permission Denied Toast.makeText(WebViewActivity.this, "All Permission GRANTED !! Thank You :)", Toast.LENGTH_SHORT) .show(); } else { // Permission Denied Toast.makeText(WebViewActivity.this, "One or More Permissions are DENIED Exiting App :(", Toast.LENGTH_SHORT) .show(); finish(); } } break; default: super.onRequestPermissionsResult(requestCode, permissions, grantResults); } } @TargetApi(Build.VERSION_CODES.M) private void fuckMarshMallow() { List<String> permissionsNeeded = new ArrayList<String>(); final List<String> permissionsList = new ArrayList<String>(); if (!addPermission(permissionsList, Manifest.permission.ACCESS_FINE_LOCATION)) permissionsNeeded.add("Show Location"); if (permissionsList.size() > 0) { if (permissionsNeeded.size() > 0) { // Need Rationale String message = "App need access to " + permissionsNeeded.get(0); for (int i = 1; i < permissionsNeeded.size(); i++) message = message + ", " + permissionsNeeded.get(i); showMessageOKCancel(message, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { requestPermissions(permissionsList.toArray(new String[permissionsList.size()]), REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS); } }); return; } requestPermissions(permissionsList.toArray(new String[permissionsList.size()]), REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS); return; } Toast.makeText(WebViewActivity.this, "No new Permission Required- Launching App .You are Awesome!!", Toast.LENGTH_SHORT) .show(); } private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) { new AlertDialog.Builder(WebViewActivity.this) .setMessage(message) .setPositiveButton("OK", okListener) .setNegativeButton("Cancel", null) .create() .show(); } @TargetApi(Build.VERSION_CODES.M) private boolean addPermission(List<String> permissionsList, String permission) { if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) { permissionsList.add(permission); // Check for Rationale Option if (!shouldShowRequestPermissionRationale(permission)) return false; } return true; } } 

Answer:

This is an example of showing alert dialog to promote for user permission to use his/her location:

 @Override public void onGeolocationPermissionsShowPrompt(final String origin, final GeolocationPermissions.Callback callback) { Log.i(TAG, "onGeolocationPermissionsShowPrompt()"); final boolean remember = false; AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Locations"); builder.setMessage("Would like to use your Current Location ") .setCancelable(true).setPositiveButton("Allow", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // origin, allow, remember callback.invoke(origin, true, remember); } }).setNegativeButton("Don't Allow", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // origin, allow, remember callback.invoke(origin, false, remember); } }); AlertDialog alert = builder.create(); alert.show(); }