Ellipsize notification preview

Refs #148

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

@@ -60,7 +60,8 @@ import static androidx.core.text.HtmlCompat.FROM_HTML_SEPARATOR_LINE_BREAK_LIST_
 import static androidx.core.text.HtmlCompat.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE;
 
 public class HtmlHelper {
-    private static final int PREVIEW_SIZE = 250;
+    static final int PREVIEW_SIZE = 250;
+
     private static final List<String> heads = Arrays.asList("h1", "h2", "h3", "h4", "h5", "h6", "p", "table", "ol", "ul", "br", "hr");
     private static final List<String> tails = Arrays.asList("h1", "h2", "h3", "h4", "h5", "h6", "p", "ol", "ul", "li");
 

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

@@ -60,6 +60,7 @@ import com.sun.mail.util.MailConnectException;
 
 import org.json.JSONArray;
 import org.json.JSONException;
+import org.jsoup.Jsoup;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -688,7 +689,12 @@ public class ServiceSynchronize extends LifecycleService {
                         StringBuilder sb = new StringBuilder();
                         if (!TextUtils.isEmpty(message.subject))
                             sb.append(message.subject).append("<br>");
-                        sb.append(HtmlHelper.getPreview(body));
+                        String text = Jsoup.parse(body).text();
+                        if (text.length() > HtmlHelper.PREVIEW_SIZE) {
+                            sb.append(text.substring(0, HtmlHelper.PREVIEW_SIZE));
+                            sb.append(" …");
+                        } else
+                            sb.append(text);
                         mbuilder.setStyle(new Notification.BigTextStyle().bigText(HtmlHelper.fromHtml(sb.toString())));
                     } catch (IOException ex) {
                         Log.e(ex);