Implement auto switcher for light and dark theme (#388)

Remove import and add author

Implement auto switcher for light and dark theme. other ui fixes

Reviewed-on: https://gitea.com/gitnex/GitNex/pulls/388
Reviewed-by: 6543 <6543@noreply.gitea.io>

app/src/main/java/org/mian/gitnex/activities/BaseActivity.java

@@ -4,6 +4,7 @@ import android.os.Bundle;
 import androidx.appcompat.app.AppCompatActivity;
 import org.mian.gitnex.R;
 import org.mian.gitnex.helpers.FontsOverride;
+import org.mian.gitnex.helpers.TimeHelper;
 import org.mian.gitnex.util.TinyDB;
 
 /**
@@ -20,6 +21,18 @@ public abstract class BaseActivity extends AppCompatActivity {
         if(tinyDb.getInt("themeId") == 1) {
             setTheme(R.style.AppThemeLight);
         }
+        else if(tinyDb.getInt("themeId") == 2) {
+
+            boolean timeSetterFlag = TimeHelper.timeBetweenHours(18, 6); // 6pm to 6am
+
+            if(timeSetterFlag) {
+                setTheme(R.style.AppTheme);
+            }
+            else {
+                setTheme(R.style.AppThemeLight);
+            }
+
+        }
         else {
             setTheme(R.style.AppTheme);
         }

app/src/main/java/org/mian/gitnex/fragments/SettingsFragment.java

@@ -44,7 +44,7 @@ public class SettingsFragment extends Fragment {
 	private static String[] customFontList = {"Roboto", "Manrope", "Source Code Pro"};
 	private static int customFontSelectedChoice = 0;
 
-	private static String[] themeList = {"Dark", "Light"};
+	private static String[] themeList = {"Dark", "Light", "Auto (Day/Night)"};
 	private static int themeSelectedChoice = 0;
 
 	@Nullable

app/src/main/java/org/mian/gitnex/helpers/TimeHelper.java

@@ -6,9 +6,14 @@ import org.ocpsoft.prettytime.PrettyTime;
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 
+/**
+ * Author M M Arif
+ */
+
 public class TimeHelper {
 
     public static String customDateFormatForToast(String customDate) {
@@ -59,4 +64,29 @@ public class TimeHelper {
 
     }
 
+    public static boolean timeBetweenHours(int fromHour, int toHour) {
+
+        Calendar cal = Calendar.getInstance();
+
+        Calendar from = Calendar.getInstance();
+        from.set(Calendar.HOUR_OF_DAY, fromHour);
+        from.set(Calendar.MINUTE, 0);
+
+        Calendar to = Calendar.getInstance();
+        to.set(Calendar.HOUR_OF_DAY, toHour);
+        to.set(Calendar.MINUTE, 0);
+
+        if(to.before(from)) {
+            if (cal.after(to)) {
+                to.add(Calendar.DATE, 1);
+            }
+            else {
+                from.add(Calendar.DATE, -1);
+            }
+        }
+
+        return cal.after(from) && cal.before(to);
+
+    }
+
 }

app/src/main/res/layout/layout_settings_fileview.xml

@@ -23,14 +23,15 @@
         android:id="@+id/pdfMode"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginTop="20dp"
+        android:layout_marginTop="10dp"
-        android:orientation="horizontal">
+        android:orientation="vertical">
 
         <TextView
             android:id="@+id/pdfModeHeader"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:textSize="16sp"
+            android:layout_marginTop="10dp"
             android:layout_marginStart="44dp"
             android:layout_marginEnd="4dp"
             android:text="@string/settingsPdfModeHeaderText"

app/src/main/res/layout/layout_settings_languages.xml

@@ -22,7 +22,7 @@
         android:id="@+id/langFrame"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginTop="5dp"
+        android:layout_marginTop="10dp"
         android:orientation="vertical">
 
         <TextView

app/src/main/res/layout/layout_settings_security.xml

@@ -23,8 +23,8 @@
         android:id="@+id/certsFrame"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginTop="20dp"
+        android:layout_marginTop="10dp"
-        android:orientation="horizontal">
+        android:orientation="vertical">
 
         <TextView
             android:id="@+id/tvCertHeader"