diff --git a/res/values/strings.xml b/res/values/strings.xml
index 8ed276b..f4c5c57 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -407,4 +407,6 @@
 <string name="p_serial_unsupported">Unsupported serial port!</string>
 <string name="p_serial_noperm">No permission for USB device!</string>
 <string name="p_serial_notfound">No USB device found!</string>
+
+<string name="no_perm_text">The following permissions are required:</string>
 </resources>
diff --git a/src/PermissionHelper.scala b/src/PermissionHelper.scala
new file mode 100644
index 0000000..de8d6b8
--- /dev/null
+++ b/src/PermissionHelper.scala
@@ -0,0 +1,78 @@
+package org.aprsdroid.app
+
+import android.app.{Activity, AlertDialog}
+import android.content.{DialogInterface, Intent}
+import android.content.pm.PackageManager
+import android.net.Uri
+import android.os.Build
+import android.provider.Settings
+
+trait PermissionHelper extends Activity {
+	def getActionName(action : Int): Int
+	def onAllPermissionsGranted(action : Int): Unit
+
+	def checkPermissions(permissions : Array[String], action : Int): Boolean = {
+		if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
+			onAllPermissionsGranted(action)
+			true
+		} else {
+			import android.Manifest
+			var need_dialog = false
+			for (p <- permissions)
+				need_dialog |= (checkSelfPermission(p) != PackageManager.PERMISSION_GRANTED)
+			if (need_dialog) {
+				//if (shouldShowRequestPermissionRationale(Manifest.permission.WRITE_EXTERNAL_STORAGE))
+				//	Toast.makeText(this, "No permission!", Toast.LENGTH_SHORT).show()
+				requestPermissions(permissions, action)
+				false
+			} else {
+				onAllPermissionsGranted(action)
+				true
+			}
+		}
+	}
+
+	abstract override def onRequestPermissionsResult(requestCode: Int, permissions: Array[_root_.java.lang.String], grantResults: Array[Int]): Unit = {
+		val failed_perms = scala.collection.mutable.Set[String]()
+		for (i <- permissions.indices) {
+			if (grantResults(i) != PackageManager.PERMISSION_GRANTED) {
+				failed_perms.add(permissions(i))
+			}
+		}
+		if (failed_perms.size > 0) {
+			onPermissionsFailed(requestCode, failed_perms.toSet)
+		} else {
+			onAllPermissionsGranted(requestCode)
+		}
+	}
+
+	def getPermissionName(permission : String) : String = {
+		try {
+			val pi = getPackageManager.getPermissionInfo(permission, 0)
+				pi.loadLabel(getPackageManager()).toString()
+		} catch {
+			case e : PackageManager.NameNotFoundException => permission.split("\\.").last
+		}
+	}
+	def onPermissionsFailed(action : Int, permissions : Set[String]): Unit = {
+		val sb = new StringBuilder(getString(R.string.no_perm_text))
+		sb.append("\n\n")
+		for (p <- permissions) {
+			sb.append("- ").append(getPermissionName(p)).append("\n")
+		}
+		new AlertDialog.Builder(this)
+			.setIcon(android.R.drawable.ic_dialog_alert)
+			.setTitle(getActionName(action))
+			.setMessage(sb.toString())
+			.setPositiveButton(R.string.preferences, new DialogInterface.OnClickListener {
+				override def onClick(dialogInterface: DialogInterface, i: Int): Unit = {
+					val intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
+						intent.setData(Uri.fromParts("package", getPackageName(), null))
+					startActivity(intent)
+				}
+			})
+			.setNegativeButton(android.R.string.cancel, null)
+			.create().show()
+	}
+
+}