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diff --git a/taler-kotlin-android/src/main/java/net/taler/common/AndroidUtils.kt b/taler-kotlin-android/src/main/java/net/taler/common/AndroidUtils.kt
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+++ b/taler-kotlin-android/src/main/java/net/taler/common/AndroidUtils.kt
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+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.common
+
+import android.content.Context
+import android.content.Context.CONNECTIVITY_SERVICE
+import android.content.Intent
+import android.content.pm.PackageManager.MATCH_DEFAULT_ONLY
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET
+import android.os.Build.VERSION.SDK_INT
+import android.os.Looper
+import android.text.format.DateUtils.DAY_IN_MILLIS
+import android.text.format.DateUtils.FORMAT_ABBREV_ALL
+import android.text.format.DateUtils.FORMAT_ABBREV_MONTH
+import android.text.format.DateUtils.FORMAT_ABBREV_RELATIVE
+import android.text.format.DateUtils.FORMAT_NO_YEAR
+import android.text.format.DateUtils.FORMAT_SHOW_DATE
+import android.text.format.DateUtils.FORMAT_SHOW_TIME
+import android.text.format.DateUtils.FORMAT_SHOW_YEAR
+import android.text.format.DateUtils.MINUTE_IN_MILLIS
+import android.text.format.DateUtils.formatDateTime
+import android.text.format.DateUtils.getRelativeTimeSpanString
+import android.view.View
+import android.view.View.INVISIBLE
+import android.view.View.VISIBLE
+import android.view.inputmethod.InputMethodManager
+import androidx.core.content.ContextCompat.getSystemService
+import androidx.fragment.app.Fragment
+import androidx.navigation.NavDirections
+import androidx.navigation.fragment.findNavController
+
+fun View.fadeIn(endAction: () -> Unit = {}) {
+ if (visibility == VISIBLE && alpha == 1f) return
+ alpha = 0f
+ visibility = VISIBLE
+ animate().alpha(1f).withEndAction {
+ if (context != null) endAction.invoke()
+ }.start()
+}
+
+fun View.fadeOut(endAction: () -> Unit = {}) {
+ if (visibility == INVISIBLE) return
+ animate().alpha(0f).withEndAction {
+ if (context == null) return@withEndAction
+ visibility = INVISIBLE
+ alpha = 1f
+ endAction.invoke()
+ }.start()
+}
+
+fun View.hideKeyboard() {
+ getSystemService(context, InputMethodManager::class.java)
+ ?.hideSoftInputFromWindow(windowToken, 0)
+}
+
+fun assertUiThread() {
+ check(Looper.getMainLooper().thread == Thread.currentThread())
+}
+
+/**
+ * Use this with 'when' expressions when you need it to handle all possibilities/branches.
+ */
+val <T> T.exhaustive: T
+ get() = this
+
+fun Context.isOnline(): Boolean {
+ val cm = getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
+ return if (SDK_INT < 29) {
+ @Suppress("DEPRECATION")
+ cm.activeNetworkInfo?.isConnected == true
+ } else {
+ val capabilities = cm.getNetworkCapabilities(cm.activeNetwork) ?: return false
+ capabilities.hasCapability(NET_CAPABILITY_INTERNET)
+ }
+}
+
+fun Intent.isSafe(context: Context): Boolean {
+ return context.packageManager.queryIntentActivities(this, MATCH_DEFAULT_ONLY).isNotEmpty()
+}
+
+fun Fragment.navigate(directions: NavDirections) = findNavController().navigate(directions)
+
+fun Long.toRelativeTime(context: Context): CharSequence {
+ val now = System.currentTimeMillis()
+ return if (now - this > DAY_IN_MILLIS * 2) {
+ val flags = FORMAT_SHOW_TIME or FORMAT_SHOW_DATE or FORMAT_ABBREV_MONTH or FORMAT_NO_YEAR
+ formatDateTime(context, this, flags)
+ } else getRelativeTimeSpanString(this, now, MINUTE_IN_MILLIS, FORMAT_ABBREV_RELATIVE)
+}
+
+fun Long.toAbsoluteTime(context: Context): CharSequence {
+ val flags = FORMAT_SHOW_TIME or FORMAT_SHOW_DATE or FORMAT_SHOW_YEAR
+ return formatDateTime(context, this, flags)
+}
+
+fun Long.toShortDate(context: Context): CharSequence {
+ val flags = FORMAT_SHOW_DATE or FORMAT_SHOW_YEAR or FORMAT_ABBREV_ALL
+ return formatDateTime(context, this, flags)
+}
+
+fun Version.getIncompatibleStringOrNull(context: Context, otherVersion: String): String? {
+ val other = Version.parse(otherVersion) ?: return context.getString(R.string.version_invalid)
+ val match = compare(other) ?: return context.getString(R.string.version_invalid)
+ if (match.compatible) return null
+ if (match.currentCmp < 0) return context.getString(R.string.version_too_old)
+ if (match.currentCmp > 0) return context.getString(R.string.version_too_new)
+ throw AssertionError("$this == $other")
+}