Show Gadgetbridge in the "share" system dialog for installing firmwares, apps etc.

app/src/main/AndroidManifest.xml

@@ -191,6 +191,15 @@
                 <data android:mimeType="application/zip" />
                 <data android:mimeType="application/x-zip-compressed" />
             </intent-filter>
+            <!-- to receive files from the "share" intent -->
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+
+                <data android:mimeType="*/*" />
+
+            </intent-filter>
         </activity>
 
         <service

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/FwAppInstallerActivity.java

@@ -152,6 +152,9 @@ public class FwAppInstallerActivity extends GBActivity implements InstallActivit
         });
 
         uri = getIntent().getData();
+        if (uri == null) { //for "share" intent
+            uri = getIntent().getParcelableExtra(Intent.EXTRA_STREAM);
+        }
         installHandler = findInstallHandlerFor(uri);
         if (installHandler == null) {
             setInfoText(getString(R.string.installer_activity_unable_to_find_handler));