ACRA: switch to notification alerts on crashes.

On some devices users weren't able to send stack traces because
EteSync would restart and then hide/cancel the email app chooser.

app/build.gradle

@@ -131,7 +131,7 @@ dependencies {
 
     def acraVersion = '5.2.1'
     implementation "ch.acra:acra-mail:$acraVersion"
-    implementation "ch.acra:acra-toast:$acraVersion"
+    implementation "ch.acra:acra-notification:$acraVersion"
     def supportVersion = '1.0.0'
     implementation "androidx.legacy:legacy-support-core-ui:$supportVersion"
     implementation "androidx.core:core:$supportVersion"

app/src/main/java/com/etesync/syncadapter/AcraConfiguration.java

@@ -1,11 +1,10 @@
 package com.etesync.syncadapter;
 
 import android.content.Context;
-import android.widget.Toast;
 
 import org.acra.config.CoreConfigurationBuilder;
 import org.acra.config.MailSenderConfigurationBuilder;
-import org.acra.config.ToastConfigurationBuilder;
+import org.acra.config.NotificationConfigurationBuilder;
 import org.acra.data.StringFormat;
 
 import static com.etesync.syncadapter.utils.EventEmailInvitationKt.emailSupportsAttachments;
@@ -22,9 +21,11 @@ public class AcraConfiguration {
                 .setReportFileName("ACRA-report.stacktrace.json")
                 .setReportAsFile(emailSupportsAttachments(context))
                 .setEnabled(true);
-        builder.getPluginConfigurationBuilder(ToastConfigurationBuilder.class)
+        builder.getPluginConfigurationBuilder(NotificationConfigurationBuilder.class)
+                .setResTitle(R.string.crash_title)
                 .setResText(R.string.crash_message)
-                .setLength(Toast.LENGTH_SHORT)
+                .setChannelName("crash-notification")
+                .setSendOnClick(true)
                 .setEnabled(true);
 
         return builder;

app/src/main/java/com/etesync/syncadapter/App.kt

@@ -113,7 +113,7 @@ class App : Application() {
             // The following line triggers the initialization of ACRA
             ACRA.init(this, AcraConfiguration.getConfig(this))
             val pm = base.packageManager
-            var installedFrom = pm.getInstallerPackageName(BuildConfig.APPLICATION_ID)
+            val installedFrom = pm.getInstallerPackageName(BuildConfig.APPLICATION_ID)
             ACRA.getErrorReporter().putCustomData("installedFrom", installedFrom);
         }
     }

app/src/main/res/values/strings.xml

@@ -22,7 +22,8 @@
     <string name="send">Send</string>
 
     <!-- Crash -->
-    <string name="crash_message">EteSync has crashed, please send stack trace to developers.</string>
+    <string name="crash_title">EteSync has crashed!</string>
+    <string name="crash_message">Please send stack trace to developers.</string>
     <string name="crash_email_subject">EteSync Debug Info</string>
 
     <!-- tourguide -->