Migrated util module files from java to kotlin (#5935)

* Rename .java to .kt

* Migrated the following files in util module to Kotlin
- AbstractTextWatcher
- ActivityUtils
- CommonsDateUtil
- DateUtil

* Rename .java to .kt

* Migrated the following files in util module to Kotlin
- DeviceInfoUtil
- ExecutorUtils
- FragmentUtils

Author: Saifuddin53

app/src/main/java/fr/free/nrw/commons/campaigns/CampaignView.java

@@ -12,15 +12,15 @@
 import fr.free.nrw.commons.campaigns.models.Campaign;
 import fr.free.nrw.commons.databinding.LayoutCampaginBinding;
 import fr.free.nrw.commons.theme.BaseActivity;
-import fr.free.nrw.commons.utils.DateUtil;
+import fr.free.nrw.commons.utils.CommonsDateUtil;
 
+import fr.free.nrw.commons.utils.DateUtil;
 import java.text.ParseException;
 import java.util.Date;
 
 import fr.free.nrw.commons.R;
 import fr.free.nrw.commons.Utils;
 import fr.free.nrw.commons.contributions.MainActivity;
-import fr.free.nrw.commons.utils.CommonsDateUtil;
 import fr.free.nrw.commons.utils.SwipableCardView;
 import fr.free.nrw.commons.utils.ViewUtil;
 

app/src/main/java/fr/free/nrw/commons/campaigns/CampaignsPresenter.java

@@ -3,6 +3,7 @@
 import android.annotation.SuppressLint;
 
 import fr.free.nrw.commons.campaigns.models.Campaign;
+import fr.free.nrw.commons.utils.CommonsDateUtil;
 import java.text.ParseException;
 import java.util.Collections;
 import java.util.Date;
@@ -14,7 +15,6 @@
 
 import fr.free.nrw.commons.BasePresenter;
 import fr.free.nrw.commons.mwapi.OkHttpJsonApiClient;
-import fr.free.nrw.commons.utils.CommonsDateUtil;
 import io.reactivex.Scheduler;
 import io.reactivex.Single;
 import io.reactivex.SingleObserver;

app/src/main/java/fr/free/nrw/commons/delete/ReasonBuilder.java

@@ -3,7 +3,6 @@
 import android.content.Context;
 
 import fr.free.nrw.commons.utils.DateUtil;
-
 import java.util.Date;
 import java.util.Locale;
 

app/src/main/java/fr/free/nrw/commons/explore/ExploreFragment.java

@@ -11,7 +11,6 @@
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 import androidx.viewpager.widget.ViewPager.OnPageChangeListener;
-import com.google.android.material.tabs.TabLayout;
 import fr.free.nrw.commons.R;
 import fr.free.nrw.commons.ViewPagerAdapter;
 import fr.free.nrw.commons.contributions.MainActivity;

app/src/main/java/fr/free/nrw/commons/media/MediaDetailFragment.java

@@ -55,7 +55,6 @@
 import fr.free.nrw.commons.actions.ThanksClient;
 import fr.free.nrw.commons.auth.AccountUtil;
 import fr.free.nrw.commons.auth.SessionManager;
-import fr.free.nrw.commons.auth.csrf.CsrfTokenClient;
 import fr.free.nrw.commons.auth.csrf.InvalidLoginTokenException;
 import fr.free.nrw.commons.category.CategoryClient;
 import fr.free.nrw.commons.category.CategoryDetailsActivity;

app/src/main/java/fr/free/nrw/commons/upload/UploadMediaDetailAdapter.java

@@ -22,7 +22,6 @@
 import android.widget.TextView;
 import androidx.activity.result.ActivityResultLauncher;
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.RecyclerView;

app/src/main/java/fr/free/nrw/commons/upload/mediaDetails/UploadMediaDetailFragment.java

@@ -1,7 +1,6 @@
 package fr.free.nrw.commons.upload.mediaDetails;
 
 import static android.app.Activity.RESULT_OK;
-import static fr.free.nrw.commons.utils.ActivityUtils.startActivityWithFlags;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
@@ -45,6 +44,7 @@
 import fr.free.nrw.commons.upload.UploadItem;
 import fr.free.nrw.commons.upload.UploadMediaDetail;
 import fr.free.nrw.commons.upload.UploadMediaDetailAdapter;
+import fr.free.nrw.commons.utils.ActivityUtils;
 import fr.free.nrw.commons.utils.DialogUtil;
 import fr.free.nrw.commons.utils.ImageUtils;
 import fr.free.nrw.commons.utils.NetworkUtils;
@@ -208,7 +208,7 @@ public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceStat
 
         try {
             if(!presenter.getImageQuality(indexOfFragment, inAppPictureLocation, getActivity())) {
-                startActivityWithFlags(
+                ActivityUtils.startActivityWithFlags(
                 getActivity(), MainActivity.class, Intent.FLAG_ACTIVITY_CLEAR_TOP,
                 Intent.FLAG_ACTIVITY_SINGLE_TOP);
             }

app/src/main/java/fr/free/nrw/commons/utils/AbstractTextWatcher.java

@@ -0,0 +1,25 @@
+package fr.free.nrw.commons.utils
+
+import android.text.Editable
+import android.text.TextWatcher
+
+class AbstractTextWatcher(
+    private val textChange: TextChange
+) : TextWatcher {
+
+    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
+        // No-op
+    }
+
+    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
+        textChange.onTextChanged(s.toString())
+    }
+
+    override fun afterTextChanged(s: Editable?) {
+        // No-op
+    }
+
+    interface TextChange {
+        fun onTextChanged(value: String)
+    }
+}

app/src/main/java/fr/free/nrw/commons/utils/AbstractTextWatcher.kt

@@ -0,0 +1,16 @@
+package fr.free.nrw.commons.utils
+
+import android.content.Context
+import android.content.Intent
+
+object ActivityUtils {
+
+    @JvmStatic
+    fun <T> startActivityWithFlags(context: Context, cls: Class<T>, vararg flags: Int) {
+        val intent = Intent(context, cls)
+        for (flag in flags) {
+            intent.addFlags(flag)
+        }
+        context.startActivity(intent)
+    }
+}

app/src/main/java/fr/free/nrw/commons/utils/ActivityUtils.java

@@ -0,0 +1,46 @@
+package fr.free.nrw.commons.utils
+
+import java.text.SimpleDateFormat
+import java.util.Locale
+import java.util.TimeZone
+
+/**
+ * Provides util functions for formatting date time.
+ * Most of our formatting needs are addressed by the data library's DateUtil class.
+ * Methods should be added here only if DateUtil class doesn't provide for it already.
+ */
+object CommonsDateUtil {
+
+    /**
+     * Gets SimpleDateFormat for short date pattern.
+     * @return simpleDateFormat
+     */
+    @JvmStatic
+    fun getIso8601DateFormatShort(): SimpleDateFormat {
+        val simpleDateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.ROOT)
+        simpleDateFormat.timeZone = TimeZone.getTimeZone("UTC")
+        return simpleDateFormat
+    }
+
+    /**
+     * Gets SimpleDateFormat for date pattern returned by Media object.
+     * @return simpleDateFormat
+     */
+    @JvmStatic
+    fun getMediaSimpleDateFormat(): SimpleDateFormat {
+        val simpleDateFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.ROOT)
+        simpleDateFormat.timeZone = TimeZone.getTimeZone("UTC")
+        return simpleDateFormat
+    }
+
+    /**
+     * Gets the timestamp pattern for a date.
+     * @return timestamp
+     */
+    @JvmStatic
+    fun getIso8601DateFormatTimestamp(): SimpleDateFormat {
+        val simpleDateFormat = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ROOT)
+        simpleDateFormat.timeZone = TimeZone.getTimeZone("UTC")
+        return simpleDateFormat
+    }
+}

app/src/main/java/fr/free/nrw/commons/utils/ActivityUtils.kt

@@ -0,0 +1,62 @@
+package fr.free.nrw.commons.utils
+
+import android.text.format.DateFormat.getBestDateTimePattern
+import java.text.ParseException
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.HashMap
+import java.util.Locale
+import java.util.TimeZone
+
+/**
+ * Utility class for date formatting and parsing.
+ * TODO: Switch to DateTimeFormatter when minSdk = 26.
+ */
+object DateUtil {
+
+    private val DATE_FORMATS: MutableMap<String, SimpleDateFormat> = HashMap()
+
+    @JvmStatic
+    @Synchronized
+    fun iso8601DateFormat(date: Date): String {
+        return getCachedDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ROOT, true).format(date)
+    }
+
+    @JvmStatic
+    @Synchronized
+    @Throws(ParseException::class)
+    fun iso8601DateParse(date: String): Date {
+        return getCachedDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ROOT, true).parse(date)
+    }
+
+    @JvmStatic
+    fun getMonthOnlyDateString(date: Date): String {
+        return getDateStringWithSkeletonPattern(date, "MMMM d")
+    }
+
+    @JvmStatic
+    fun getExtraShortDateString(date: Date): String {
+        return getDateStringWithSkeletonPattern(date, "MMM d")
+    }
+
+    @JvmStatic
+    @Synchronized
+    fun getDateStringWithSkeletonPattern(date: Date, pattern: String): String {
+        return getCachedDateFormat(
+            getBestDateTimePattern(Locale.getDefault(), pattern),
+            Locale.getDefault(), false
+        ).format(date)
+    }
+
+    @JvmStatic
+    private fun getCachedDateFormat(pattern: String, locale: Locale, utc: Boolean): SimpleDateFormat {
+        if (!DATE_FORMATS.containsKey(pattern)) {
+            val df = SimpleDateFormat(pattern, locale)
+            if (utc) {
+                df.timeZone = TimeZone.getTimeZone("UTC")
+            }
+            DATE_FORMATS[pattern] = df
+        }
+        return DATE_FORMATS[pattern]!!
+    }
+}