Preferences: Import all/Export all has now transparent background and back button works as desired.

src/main/AndroidManifest.xml

@@ -83,7 +83,9 @@ limitations under the License.
             android:name=".AggregatedStatsActivity"
             android:label="@string/menu_aggregated_statistics" />
         <activity android:name=".DeleteActivity" />
-        <activity android:name=".io.file.importer.ImportActivity">
+        <activity
+            android:name=".io.file.importer.ImportActivity"
+            android:theme="@style/ThemeCustomTransparent">
             <intent-filter>
                 <action android:name="android.intent.action.ATTACH_DATA" />
                 <action android:name="android.intent.action.VIEW" />
@@ -128,7 +130,9 @@ limitations under the License.
                 android:name="android.app.default_searchable"
                 android:value=".SearchListActivity" />
         </activity>
-        <activity android:name=".io.file.exporter.ExportActivity" />
+        <activity
+            android:name=".io.file.exporter.ExportActivity"
+            android:theme="@style/ThemeCustomTransparent" />
         <activity android:name=".settings.RecordingSettingsActivity" />
         <activity android:name=".settings.SettingsActivity" />
         <activity android:name=".settings.StatsSettingsActivity" />

src/main/java/de/dennisguse/opentracks/fragments/FileTypeDialogFragment.java

@@ -70,14 +70,35 @@ public class FileTypeDialogFragment extends AbstractDialogFragment {
             choices[i] = getString(optionId, trackFileFormat.name(),
                     FileUtils.getPathDisplayName(trackFileFormat.getExtension()));
         }
-        return new AlertDialog.Builder(getActivity()).setNegativeButton(R.string.generic_cancel, null)
+        return new AlertDialog.Builder(getActivity())
+                .setCancelable(true)
+                .setNegativeButton(R.string.generic_cancel, new OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        onDismissed();
+                    }
+                })
                 .setPositiveButton(R.string.generic_ok, new OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         int position = ((AlertDialog) dialog).getListView().getCheckedItemPosition();
                         caller.onFileTypeDone(TrackFileFormat.values()[position]);
                     }
-                }).setSingleChoiceItems(choices, 0, null).setTitle(titleId).create();
+                })
+                .setSingleChoiceItems(choices, 0, null)
+                .setTitle(titleId)
+                .setOnCancelListener(new DialogInterface.OnCancelListener() {
+                    @Override
+                    public void onCancel(DialogInterface dialog) {
+                        onDismissed();
+                    }
+                })
+                .create();
+    }
+
+    protected void onDismissed() {
+        dismiss();
+        caller.onDismissed();
     }
 
     /**
@@ -91,5 +112,7 @@ public class FileTypeDialogFragment extends AbstractDialogFragment {
          * Called when file type selection is done.
          */
         void onFileTypeDone(TrackFileFormat trackFileFormat);
+
+        void onDismissed();
     }
 }

src/main/java/de/dennisguse/opentracks/io/file/exporter/ExportActivity.java

@@ -92,6 +92,11 @@ public class ExportActivity extends FragmentActivity implements FileTypeDialogFr
 //        }
     }
 
+    @Override
+    public void onDismissed() {
+        finish();
+    }
+
     @Override
     protected Dialog onCreateDialog(int id) {
         switch (id) {
@@ -103,6 +108,7 @@ public class ExportActivity extends FragmentActivity implements FileTypeDialogFr
                             public void onCancel(DialogInterface dialog) {
                                 saveAsyncTask.cancel(true);
                                 dialog.dismiss();
+                                onDismissed();
                             }
                         }, directoryDisplayName);
                 return progressDialog;
@@ -129,13 +135,13 @@ public class ExportActivity extends FragmentActivity implements FileTypeDialogFr
                             @Override
                             public void onCancel(DialogInterface dialog) {
                                 dialog.dismiss();
-                                finish();
+                                onDismissed();
                             }
                         }).setPositiveButton(R.string.generic_ok, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int arg1) {
                                 dialog.dismiss();
-                                finish();
+                                onDismissed();
                             }
                         }).setTitle(titleId);
                 final Dialog dialog = builder.create();

src/main/java/de/dennisguse/opentracks/io/file/importer/ImportActivity.java

@@ -102,6 +102,11 @@ public class ImportActivity extends FragmentActivity implements FileTypeDialogFr
 //        }
     }
 
+    @Override
+    public void onDismissed() {
+        finish();
+    }
+
     @Override
     protected Dialog onCreateDialog(int id) {
         switch (id) {
@@ -112,6 +117,7 @@ public class ImportActivity extends FragmentActivity implements FileTypeDialogFr
                             public void onCancel(DialogInterface dialog) {
                                 importAsyncTask.cancel(true);
                                 dialog.dismiss();
+                                onDismissed();
                             }
                         }, directoryDisplayName);
                 return progressDialog;
@@ -142,13 +148,13 @@ public class ImportActivity extends FragmentActivity implements FileTypeDialogFr
                             @Override
                             public void onCancel(DialogInterface dialogInterface) {
                                 dialogInterface.dismiss();
-                                finish();
+                                onDismissed();
                             }
                         }).setPositiveButton(R.string.generic_ok, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialogInterface, int which) {
                                 dialogInterface.dismiss();
-                                finish();
+                                onDismissed();
                             }
                         }).setTitle(titleId).create();
                 dialog.setOnShowListener(new DialogInterface.OnShowListener() {

src/main/res/values/themes_custom.xml

@@ -32,6 +32,16 @@ limitations under the License.
         <item name="android:alertDialogTheme">@style/CustomAlertDialogTheme</item>
     </style>
 
+    <style name="ThemeCustomTransparent" parent="ThemeCustom">
+        <!-- TODO Remove when moving to settings to fragments. -->
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowIsFloating">true</item>
+        <item name="android:backgroundDimEnabled">false</item>
+    </style>
+
     <style name="CustomAlertDialogTheme" parent="@android:style/Theme.Holo.Dialog">
         <!-- From auto generated -->
         <item name="android:activatedBackgroundIndicator">@drawable/activated_background_holo_dark