Initial commit

app/src/main/java/xyz/quaver/pupil/SettingsActivity.kt

@@ -0,0 +1,80 @@
+package xyz.quaver.pupil
+
+import android.os.Bundle
+import android.view.MenuItem
+import androidx.appcompat.app.AlertDialog
+import androidx.appcompat.app.AppCompatActivity
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+
+class SettingsActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.settings_activity)
+        supportFragmentManager
+            .beginTransaction()
+            .replace(R.id.settings, SettingsFragment())
+            .commit()
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    }
+
+    class SettingsFragment : PreferenceFragmentCompat() {
+
+        private val suffix = listOf(
+            "B",
+            "kB",
+            "MB",
+            "GB",
+            "TB" //really?
+        )
+
+        private fun getCacheSize() : String {
+            var size = context!!.cacheDir.walk().map { it.length() }.sum()
+            var suffixIndex = 0
+
+            while (size >= 1024) {
+                size /= 1024
+                suffixIndex++
+            }
+
+            return getString(R.string.settings_delete_cache_summary, size, suffix[suffixIndex])
+        }
+
+        override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+            setPreferencesFromResource(R.xml.root_preferences, rootKey)
+
+            with(findPreference<Preference>("delete_cache")) {
+                this ?: return@with
+
+                summary = getCacheSize()
+
+                setOnPreferenceClickListener {
+                    AlertDialog.Builder(context).apply {
+                        setTitle(getString(R.string.settings_delete_cache_alert_title))
+                        setMessage(getString(R.string.settings_delete_cache_alert_message))
+                        setPositiveButton(android.R.string.yes) { _, _ ->
+                            with(context.cacheDir) {
+                                if (exists())
+                                    deleteRecursively()
+                            }
+
+                            summary = getCacheSize()
+                        }
+                        setNegativeButton(android.R.string.no) { _, _ -> }
+                    }.show()
+
+                    true
+                }
+            }
+        }
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
+        when (item?.itemId) {
+            android.R.id.home -> onBackPressed()
+        }
+
+        return true
+    }
+}