Improved no stream handling

app/src/main/java/eu/faircode/email/NoStreamException.java

@@ -0,0 +1,88 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2022 by Marcel Bokhorst (M66B)
+*/
+
+import android.Manifest;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.net.Uri;
+import android.provider.Settings;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.ImageButton;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.app.AlertDialog;
+
+import java.io.FileNotFoundException;
+
+public class NoStreamException extends SecurityException {
+    private Uri uri;
+
+    private NoStreamException(@NonNull Uri uri) {
+        Log.w("Read uri=" + uri);
+        this.uri = uri;
+    }
+
+    static void check(Uri uri, Context context) throws FileNotFoundException {
+        if (uri == null)
+            throw new FileNotFoundException("Selected file");
+
+        if ("content".equals(uri.getScheme()))
+            return;
+        if (Helper.hasPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE))
+            return;
+
+        throw new NoStreamException(uri);
+    }
+
+    void report(Context context) {
+        View dview = LayoutInflater.from(context).inflate(R.layout.dialog_no_stream, null);
+
+        TextView tvUri = dview.findViewById(R.id.tvUri);
+        ImageButton ibInfo = dview.findViewById(R.id.ibInfo);
+
+        tvUri.setText(uri == null ? null : uri.toString());
+
+        ibInfo.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Helper.viewFAQ(v.getContext(), 49);
+            }
+        });
+
+        new AlertDialog.Builder(context)
+                .setView(dview)
+                .setNegativeButton(android.R.string.cancel, null)
+                .setPositiveButton(R.string.title_setup_grant, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialogInterface, int i) {
+                        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                        Uri uri = Uri.fromParts("package", context.getPackageName(), null);
+                        intent.setData(uri);
+                        context.startActivity(intent);
+                    }
+                })
+                .show();
+    }
+}