Added option to reset network usage statistics

app/src/main/java/eu/faircode/netguard/ActivitySettings.java

@@ -172,13 +172,30 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
             cat_advanced.removePreference(screen.findPreference("filter_allowed"));
         }
 
-        // Show resolved
-        Preference pref_show_resolved = screen.findPreference("show_resolved");
-        pref_show_resolved.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+        Preference pref_reset_usage = screen.findPreference("reset_usage");
+        pref_reset_usage.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
             @Override
             public boolean onPreferenceClick(Preference preference) {
-                startActivity(new Intent(ActivitySettings.this, ActivityDns.class));
-                return true;
+                new AsyncTask<Object, Object, Throwable>() {
+                    @Override
+                    protected Throwable doInBackground(Object... objects) {
+                        try {
+                            DatabaseHelper.getInstance(ActivitySettings.this).resetUsage(-1);
+                            return null;
+                        } catch (Throwable ex) {
+                            return ex;
+                        }
+                    }
+
+                    @Override
+                    protected void onPostExecute(Throwable ex) {
+                        if (ex == null)
+                            Toast.makeText(ActivitySettings.this, R.string.msg_completed, Toast.LENGTH_LONG).show();
+                        else
+                            Toast.makeText(ActivitySettings.this, ex.toString(), Toast.LENGTH_LONG).show();
+                    }
+                }.execute();
+                return false;
             }
         });
 
@@ -324,6 +341,16 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
             prefs.edit().remove("loglevel").apply();
         }
 
+        // Show resolved
+        Preference pref_show_resolved = screen.findPreference("show_resolved");
+        pref_show_resolved.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+            @Override
+            public boolean onPreferenceClick(Preference preference) {
+                startActivity(new Intent(ActivitySettings.this, ActivityDns.class));
+                return true;
+            }
+        });
+
         // Handle technical info
         Preference.OnPreferenceClickListener listener = new Preference.OnPreferenceClickListener() {
             @Override

app/src/main/java/eu/faircode/netguard/DatabaseHelper.java

@@ -592,6 +592,30 @@ public class DatabaseHelper extends SQLiteOpenHelper {
         notifyAccessChanged();
     }
 
+    public void resetUsage(int uid) {
+        mLock.writeLock().lock();
+        try {
+            SQLiteDatabase db = this.getWritableDatabase();
+            db.beginTransactionNonExclusive();
+            try {
+                ContentValues cv = new ContentValues();
+                cv.putNull("sent");
+                cv.putNull("received");
+                db.update("access", cv,
+                        (uid < 0 ? null : "uid = ?"),
+                        (uid < 0 ? null : new String[]{Integer.toString(uid)}));
+
+                db.setTransactionSuccessful();
+            } finally {
+                db.endTransaction();
+            }
+        } finally {
+            mLock.writeLock().unlock();
+        }
+
+        notifyAccessChanged();
+    }
+
     public Cursor getAccess(int uid) {
         mLock.readLock().lock();
         try {

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

@@ -75,6 +75,7 @@ however it is impossible to guarantee NetGuard will work correctly on every devi
     <string name="setting_filter_allowed">Filter allowed traffic</string>
     <string name="setting_resolved">Store resolved domain names</string>
     <string name="setting_track_usage">Track network usage</string>
+    <string name="setting_reset_usage">Reset network usage</string>
     <string name="setting_show_resolved" translatable="false">Show resolved domain names</string>
     <string name="setting_block_domains">Block domain names</string>
     <string name="setting_forwarding">Port forwarding</string>

app/src/main/res/xml-v14/preferences.xml

@@ -124,6 +124,9 @@
             android:key="track_usage"
             android:summary="@string/summary_track_usage"
             android:title="@string/setting_track_usage" />
+        <Preference
+            android:key="reset_usage"
+            android:title="@string/setting_reset_usage" />
         <CheckBoxPreference
             android:defaultValue="true"
             android:dependency="filter_allowed"

app/src/main/res/xml-v21/preferences.xml

@@ -124,6 +124,9 @@
             android:key="track_usage"
             android:summary="@string/summary_track_usage"
             android:title="@string/setting_track_usage" />
+        <Preference
+            android:key="reset_usage"
+            android:title="@string/setting_reset_usage" />
         <eu.faircode.netguard.SwitchPreference
             android:defaultValue="true"
             android:dependency="filter_allowed"