Support cases when there is no files to import or export.

MyTracks/res/values/strings.xml

@@ -637,6 +637,16 @@ limitations under the License.
       %2$s the directory. E.g., '/MyTracks/kml'.">
     Exported %1$d of %2$s to %3$s.
   </string>
+  <string name="export_external_storage_no_track"
+    translation_description="When exporting tracks to the external storage, the messsage in the
+      result dialog when there is no tracks to export.">
+    There is no tracks to export.
+  </string>
+  <string name="export_external_storage_no_track_title"
+    translation_description="When exporting tracks to the external storage, the title in the result
+      dialog when there is no tracks to export.">
+    Export tracks
+  </string>
   <string name="export_external_storage_option"
     translation_description="When exporting a track to the external storage, the option to export as
       a certain file format.
@@ -929,6 +939,19 @@ limitations under the License.
       %1$s: the directory. E.g., '/MyTracks/kml'.">
     %1$s does not exist.
   </string>
+  <string name="import_no_file"
+    translation_description="When importing from the external storage, the message in the result
+      dialog when there is no files to import.
+
+      %1$s: the directory. E.g., '/MyTracks/kml'.">
+    There were no files to import. Connect your device to your computer and place the files to
+    import in %1$s.
+  </string>
+  <string name="import_no_file_title"
+    translation_description="When importing from the external storage, the title in the result
+      dialog when there is no files to import.">
+    Import files
+  </string>
   <string name="import_progress_message"
     translation_description="When importing from the external storage, the progress message.
 

MyTracks/src/com/google/android/apps/mytracks/io/file/ImportActivity.java

@@ -147,20 +147,28 @@ public class ImportActivity extends Activity {
             }, directoryDisplayName);
         return progressDialog;
       case DIALOG_RESULT_ID:
-        final boolean success;
+        int iconId;
+        int titleId;
         String message;
         String totalFiles = getResources()
             .getQuantityString(R.plurals.files, totalCount, totalCount);
-        if (successCount == totalCount && totalCount > 0) {
+        if (successCount == totalCount) {
-          success = true;
+          iconId = android.R.drawable.ic_dialog_info;
-          message = getString(R.string.import_success, totalFiles, directoryDisplayName);
+          if (totalCount == 0) {
+            titleId = R.string.import_no_file_title;
+            message = getString(R.string.import_no_file, directoryDisplayName);
+          } else {
+            titleId = R.string.generic_success_title;
+            message = getString(R.string.import_success, totalFiles, directoryDisplayName);
+          }
         } else {
-          success = false;
+          iconId = android.R.drawable.ic_dialog_alert;
-          message = getString(R.string.import_error, successCount, totalFiles, directoryDisplayName);
+          titleId = R.string.generic_error_title;
+          message = getString(
+              R.string.import_error, successCount, totalFiles, directoryDisplayName);
         }
-        return new AlertDialog.Builder(this).setCancelable(true).setIcon(
+        return new AlertDialog.Builder(this).setCancelable(true).setIcon(iconId).setMessage(message)
-            success ? android.R.drawable.ic_dialog_info : android.R.drawable.ic_dialog_alert)
+            .setOnCancelListener(new DialogInterface.OnCancelListener() {
-            .setMessage(message).setOnCancelListener(new DialogInterface.OnCancelListener() {
                 @Override
               public void onCancel(DialogInterface dialog) {
                 dialog.dismiss();
@@ -169,7 +177,7 @@ public class ImportActivity extends Activity {
             }).setPositiveButton(R.string.generic_ok, new DialogInterface.OnClickListener() {
                 @Override
               public void onClick(DialogInterface dialog, int which) {
-                if (success && !importAll && trackId != -1L) {
+                if (successCount == totalCount && !importAll && trackId != -1L) {
                   Intent intent = IntentUtils.newIntent(
                       ImportActivity.this, TrackDetailActivity.class)
                       .putExtra(TrackDetailActivity.EXTRA_TRACK_ID, trackId);
@@ -180,8 +188,7 @@ public class ImportActivity extends Activity {
                 dialog.dismiss();
                 finish();
               }
-            }).setTitle(success ? R.string.generic_success_title : R.string.generic_error_title)
+            }).setTitle(titleId).create();
-            .create();
       default:
         return null;
     }

MyTracks/src/com/google/android/apps/mytracks/io/file/SaveActivity.java

@@ -126,21 +126,30 @@ public class SaveActivity extends Activity {
             }, directoryDisplayName);
         return progressDialog;
       case DIALOG_RESULT_ID:
-        boolean success;
+        int iconId;
+        int titleId;
         String message;
         String totalTracks = getResources()
             .getQuantityString(R.plurals.tracks, totalCount, totalCount);
-        if (successCount == totalCount && totalCount > 0) {
+        if (successCount == totalCount) {
-          success = true;
+          iconId = android.R.drawable.ic_dialog_info;
-          message = getString(R.string.export_external_storage_success, totalTracks, directoryDisplayName);
+          if (totalCount == 0) {
+            titleId = R.string.export_external_storage_no_track_title;
+            message = getString(R.string.export_external_storage_no_track);
+          } else {
+            titleId = R.string.generic_success_title;
+            message = getString(
+                R.string.export_external_storage_success, totalTracks, directoryDisplayName);
+          }
         } else {
-          success = false;
+          iconId = android.R.drawable.ic_dialog_alert;
-          message = getString(
+          titleId = R.string.generic_error_title;
-              R.string.export_external_storage_error, successCount, totalTracks, directoryDisplayName);
+          message = getString(R.string.export_external_storage_error, successCount, totalTracks,
+              directoryDisplayName);
         }
-        AlertDialog.Builder builder = new AlertDialog.Builder(this).setCancelable(true).setIcon(
+        AlertDialog.Builder builder = new AlertDialog.Builder(this).setCancelable(true)
-            success ? android.R.drawable.ic_dialog_info : android.R.drawable.ic_dialog_alert)
+            .setIcon(iconId).setMessage(message)
-            .setMessage(message).setOnCancelListener(new DialogInterface.OnCancelListener() {
+            .setOnCancelListener(new DialogInterface.OnCancelListener() {
                 @Override
               public void onCancel(DialogInterface dialog) {
                 dialog.dismiss();
@@ -152,8 +161,8 @@ public class SaveActivity extends Activity {
                 dialog.dismiss();
                 finish();
               }
-            }).setTitle(success ? R.string.generic_success_title : R.string.generic_error_title);
+            }).setTitle(titleId);
-        if (!playTrack && trackIds.length == 1 && trackIds[0] != -1L && success
+        if (!playTrack && trackIds.length == 1 && trackIds[0] != -1L && successCount == totalCount
             && savedPath != null) {
           builder.setNegativeButton(
               R.string.share_track_share_file, new DialogInterface.OnClickListener() {
@@ -167,7 +176,6 @@ public class SaveActivity extends Activity {
                 }
               });
         }
-
         return builder.create();
       default:
         return null;