Bangle.js: ensure we can return to appsmanagementactivity after having opened another window

Attempting to handle file open and close dialogs from the WebView

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/banglejs/AppsManagementActivity.java

@@ -2,16 +2,23 @@ package nodomain.freeyourgadget.gadgetbridge.devices.banglejs;
 
 import static nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst.PREF_DEVICE_INTERNET_ACCESS;
 
+import android.app.Activity;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.net.Uri;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.DownloadListener;
 import android.webkit.JavascriptInterface;
+import android.webkit.PermissionRequest;
+import android.webkit.ValueCallback;
+import android.webkit.WebChromeClient;
+import android.webkit.WebResourceRequest;
 import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
@@ -55,6 +62,8 @@ public class AppsManagementActivity extends AbstractGBActivity {
     private DeviceCoordinator mCoordinator;
     /// It seems we can get duplicate broadcasts sometimes - so this helps to avoid that
     private int deviceRxSeq = -1;
+    /// When a file chooser has been opened in the WebView, this is what should get called
+    private ValueCallback<Uri[]> fileChooserCallback;
 
     public AppsManagementActivity() {
     }
@@ -81,15 +90,12 @@ public class AppsManagementActivity extends AbstractGBActivity {
     @Override
     protected void onPause() {
         super.onPause();
-        webView.destroy();
-        webView = null;
-        LocalBroadcastManager.getInstance(this).unregisterReceiver(deviceUpdateReceiver);
-        finish();
     }
 
     @Override
     protected void onResume() {
         super.onResume();
+        if (webView!=null) return; // already set up
         IntentFilter commandFilter = new IntentFilter();
         commandFilter.addAction(GBDevice.ACTION_DEVICE_CHANGED);
         commandFilter.addAction(BangleJSDeviceSupport.BANGLEJS_COMMAND_RX);
@@ -97,6 +103,15 @@ public class AppsManagementActivity extends AbstractGBActivity {
         initViews();
     }
 
+    @Override
+    protected void onDestroy() {
+        webView.destroy();
+        webView = null;
+        LocalBroadcastManager.getInstance(this).unregisterReceiver(deviceUpdateReceiver);
+        super.onDestroy();
+        finish();
+    }
+
     BroadcastReceiver deviceUpdateReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
@@ -180,6 +195,79 @@ public class AppsManagementActivity extends AbstractGBActivity {
             public void onPageFinished(WebView view, String weburl){
                 //webView.loadUrl("javascript:showToast('WebView in Espruino')");
             }
+            @Override
+            public boolean shouldOverrideUrlLoading(WebView vw, WebResourceRequest request) {
+                Intent intent = new Intent(Intent.ACTION_VIEW, request.getUrl());
+                vw.getContext().startActivity(intent);
+                return true;
+            }
+
+            @Override
+            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
+                Toast.makeText(AppsManagementActivity.this, "Error:" + description, Toast.LENGTH_SHORT).show();
+                view.loadUrl("about:blank");
+            }
+        });
+        webView.setWebChromeClient(new WebChromeClient() {
+            @Override
+            public void onPermissionRequest(final PermissionRequest request) {
+                request.grant(request.getResources());
+            }
+
+            @Override
+            public boolean onShowFileChooser(WebView vw, ValueCallback<Uri[]> filePathCallback,
+                                             FileChooserParams fileChooserParams) {
+                if (fileChooserCallback != null) {
+                    fileChooserCallback.onReceiveValue(null);
+                }
+                fileChooserCallback = filePathCallback;
+
+                Intent selectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
+                selectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
+                String[] acceptedTypes = fileChooserParams.getAcceptTypes();
+                if ((acceptedTypes!=null) && acceptedTypes.length>0 && acceptedTypes[0].contains("/"))
+                    selectionIntent.setType(acceptedTypes[0]);
+                else
+                    selectionIntent.setType("*/*");
+
+                Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
+                chooserIntent.putExtra(Intent.EXTRA_INTENT, selectionIntent);
+                startActivityForResult(chooserIntent, 0);
+
+                return true;
+            }
+
+
+        });
+        webView.setDownloadListener(new DownloadListener() {
+            public void onDownloadStart(String url, String userAgent,
+                                        String contentDisposition, String mimetype,
+                                        long contentLength) {
+                if (url == null) return;
+                Intent i = new Intent(Intent.ACTION_VIEW);
+                i.setData(Uri.parse(url.replaceFirst("^blob:", "")));
+                startActivity(i);
+
+                /*DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); //  fails with java.lang.IllegalArgumentException: Can not handle uri::
+                request.allowScanningByMediaScanner();
+                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
+                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "download");
+                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
+                dm.enqueue(request);*/
+            }
         });
     }
+
+    @Override // for file chooser results
+    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
+        super.onActivityResult(requestCode, resultCode, intent);
+
+        if (fileChooserCallback==null) return;
+        Uri[] results = null;
+        if (resultCode == Activity.RESULT_OK)
+            results = new Uri[]{Uri.parse(intent.getDataString())};
+        fileChooserCallback.onReceiveValue(results);
+        fileChooserCallback = null;
+    }
+
 }