Debug info: send inline on Android <4.1 and when creating an attachment doesn't work

app/src/main/java/at/bitfire/davdroid/ui/DebugInfoActivity.java

@@ -28,7 +28,6 @@ import android.text.TextUtils;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.widget.TextView;
-import android.widget.Toast;
 
 import org.apache.commons.lang3.exception.ExceptionUtils;
 import org.apache.commons.lang3.text.WordUtils;
@@ -86,6 +85,10 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
             sendIntent.setType("text/plain");
             sendIntent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.app_name) + " " + BuildConfig.VERSION_NAME + " debug info");
 
+            // since Android 4.1, FileProvider permissions are handled in a useful way (using ClipData)
+            boolean asAttachment = Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
+
+            if (asAttachment)
                 try {
                     File debugInfoDir = new File(getCacheDir(), "debug-info");
                     debugInfoDir.mkdir();
@@ -97,12 +100,24 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
                     writer.close();
 
                     sendIntent.putExtra(Intent.EXTRA_STREAM, FileProvider.getUriForFile(this, getString(R.string.authority_log_provider), reportFile));
+                    sendIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+
+                } catch(IOException e) {
+                    // creating an attachment failed, so send it inline
+                    asAttachment = false;
+
+                    StringBuilder builder = new StringBuilder();
+                    builder .append("Couldn't write debug info file:\n")
+                            .append(ExceptionUtils.getStackTrace(e))
+                            .append("\n\n")
+                            .append(report);
+                    report = builder.toString();
+                }
+
+            if (!asAttachment)
+                sendIntent.putExtra(Intent.EXTRA_TEXT, report);
 
             startActivity(Intent.createChooser(sendIntent, null));
-            } catch (IOException e) {
-                App.log.log(Level.SEVERE, "Couldn't write debug info file", e);
-                Toast.makeText(this, e.getLocalizedMessage(), Toast.LENGTH_LONG).show();
-            }
         }
     }