Save backup import/export location for future import/exports

app/src/main/java/org/schabi/newpipe/settings/ContentSettingsFragment.java

@@ -26,6 +26,7 @@
 import org.schabi.newpipe.extractor.localization.ContentCountry;
 import org.schabi.newpipe.extractor.localization.Localization;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
+import org.schabi.newpipe.util.FilePathUtils;
 import org.schabi.newpipe.util.ZipHelper;
 
 import java.io.File;
@@ -41,6 +42,8 @@ public class ContentSettingsFragment extends BasePreferenceFragment {
 
     private ContentSettingsManager manager;
 
+    private String importExportDataPathKey;
+
     private String thumbnailLoadToggleKey;
     private String youtubeRestrictedModeEnabledKey;
 
@@ -56,13 +59,18 @@ public void onCreatePreferences(final Bundle savedInstanceState, final String ro
 
         addPreferencesFromResource(R.xml.content_settings);
 
+        importExportDataPathKey = getString(R.string.import_export_data_path);
         final Preference importDataPreference = findPreference(getString(R.string.import_data));
         importDataPreference.setOnPreferenceClickListener(p -> {
             final Intent i = new Intent(getActivity(), FilePickerActivityHelper.class)
                     .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_MULTIPLE, false)
                     .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, false)
                     .putExtra(FilePickerActivityHelper.EXTRA_MODE,
                             FilePickerActivityHelper.MODE_FILE);
+            final String path = defaultPreferences.getString(importExportDataPathKey, "");
+            if (FilePathUtils.isValidDirectoryPath(path)) {
+                i.putExtra(FilePickerActivityHelper.EXTRA_START_PATH, path);
+            }
             startActivityForResult(i, REQUEST_IMPORT_PATH);
             return true;
         });
@@ -74,6 +82,10 @@ public void onCreatePreferences(final Bundle savedInstanceState, final String ro
                     .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, true)
                     .putExtra(FilePickerActivityHelper.EXTRA_MODE,
                             FilePickerActivityHelper.MODE_DIR);
+            final String path = defaultPreferences.getString(importExportDataPathKey, "");
+            if (FilePathUtils.isValidDirectoryPath(path)) {
+                i.putExtra(FilePickerActivityHelper.EXTRA_START_PATH, path);
+            }
             startActivityForResult(i, REQUEST_EXPORT_PATH);
             return true;
         });
@@ -164,7 +176,10 @@ public void onActivityResult(final int requestCode, final int resultCode,
 
         if ((requestCode == REQUEST_IMPORT_PATH || requestCode == REQUEST_EXPORT_PATH)
                 && resultCode == Activity.RESULT_OK && data.getData() != null) {
-            final String path = Utils.getFileForUri(data.getData()).getAbsolutePath();
+            final File file = Utils.getFileForUri(data.getData());
+            final String path = file.getAbsolutePath();
+            setImportExportDataPath(file);
+
             if (requestCode == REQUEST_EXPORT_PATH) {
                 final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
                 exportDatabase(path + "/NewPipeData-" + sdf.format(new Date()) + ".zip");
@@ -239,4 +254,19 @@ private void importDatabase(final String filePath) {
             ErrorActivity.reportUiErrorInSnackbar(this, "Importing database", e);
         }
     }
+
+    private void setImportExportDataPath(final File file) {
+        final String directoryPath;
+        if (file.isDirectory()) {
+            directoryPath = file.getAbsolutePath();
+        } else {
+            final File parentFile = file.getParentFile();
+            if (parentFile != null) {
+                directoryPath = parentFile.getAbsolutePath();
+            } else {
+                directoryPath = "";
+            }
+        }
+        defaultPreferences.edit().putString(importExportDataPathKey, directoryPath).apply();
+    }
 }

app/src/main/java/org/schabi/newpipe/util/FilePathUtils.java

@@ -0,0 +1,22 @@
+package org.schabi.newpipe.util;
+
+import java.io.File;
+
+public final class FilePathUtils {
+    private FilePathUtils() { }
+
+
+    /**
+     * Check that the path is a valid directory path and it exists.
+     *
+     * @param path full path of directory,
+     * @return is path valid or not
+     */
+    public static boolean isValidDirectoryPath(final String path) {
+        if (path == null || path.isEmpty()) {
+            return false;
+        }
+        final File file = new File(path);
+        return file.exists() && file.isDirectory();
+    }
+}

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

@@ -265,6 +265,7 @@
     </string-array>
     <string name="feed_use_dedicated_fetch_method_key" translatable="false">feed_use_dedicated_fetch_method</string>
 
+    <string name="import_export_data_path" translatable="false">import_export_data_path</string>
     <string name="import_data" translatable="false">import_data</string>
     <string name="export_data" translatable="false">export_data</string>
 

app/src/test/java/org/schabi/newpipe/util/FilePathHelperTest.java

@@ -0,0 +1,56 @@
+package org.schabi.newpipe.util;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class FilePathHelperTest {
+
+    private Path dir;
+
+    @Before
+    public void setUp() throws IOException {
+        dir = Files.createTempDirectory("dir1");
+    }
+
+    @Test
+    public void testIsValidDirectoryPathWithEmptyString() {
+        assertFalse(FilePathUtils.isValidDirectoryPath(""));
+    }
+
+    @Test
+    public void testIsValidDirectoryPathWithNullString() {
+        assertFalse(FilePathUtils.isValidDirectoryPath(null));
+    }
+
+    @Test
+    public void testIsValidDirectoryPathWithValidPath() {
+        assertTrue(FilePathUtils.isValidDirectoryPath(dir.toAbsolutePath().toString()));
+    }
+
+    @Test
+    public void testIsValidDirectoryPathWithDeepValidDirectory() throws IOException {
+        final File subDir = Files.createDirectory(dir.resolve("subdir")).toFile();
+        assertTrue(FilePathUtils.isValidDirectoryPath(subDir.getAbsolutePath()));
+    }
+
+    @Test
+    public void testIsValidDirectoryPathWithNotExistDirectory() {
+        assertFalse(FilePathUtils.isValidDirectoryPath(dir.resolve("not-exists-subdir").
+            toFile().getAbsolutePath()));
+    }
+
+    @Test
+    public void testIsValidDirectoryPathWithFile() throws IOException {
+        final File tempFile = Files.createFile(dir.resolve("simple_file")).toFile();
+        assertFalse(FilePathUtils.isValidDirectoryPath(tempFile.getAbsolutePath()));
+    }
+
+}