Make chosen background images persistent

- by saving the image Uri in SharedPreferences

app/src/main/java/com/finnmglas/launcher/MainActivity.kt

@@ -2,8 +2,10 @@ package com.finnmglas.launcher
 
 import android.content.Context
 import android.content.Intent
+import android.net.Uri
 import android.os.AsyncTask
 import android.os.Bundle
+import android.provider.MediaStore
 import android.util.DisplayMetrics
 import android.view.*
 import androidx.appcompat.app.AppCompatActivity
@@ -51,8 +53,14 @@ class MainActivity : AppCompatActivity(),
 
         currentTheme = getSavedTheme(this)
 
-        if (currentTheme == "custom" && background == null)
+        if (currentTheme == "custom") {
+            try {
+                background = MediaStore.Images.Media.getBitmap(this.contentResolver, Uri.parse(sharedPref.getString("background_uri", "")))
+            } catch (e: Exception) {  }
+
+            if (background == null)
                 currentTheme = saveTheme(this, "finn")
+        }
 
         setTheme(
             when (currentTheme) {

app/src/main/java/com/finnmglas/launcher/settings/SettingsFragmentTheme.kt

@@ -1,7 +1,9 @@
 package com.finnmglas.launcher.settings
 
 import android.Manifest
+import android.content.Context
 import android.content.Intent
+import android.content.SharedPreferences
 import android.content.pm.PackageManager
 import android.os.Build
 import android.os.Bundle
@@ -92,6 +94,13 @@ class SettingsFragmentTheme : Fragment() {
             if (data == null) return
 
             val imageUri = data.data
+
+            /* Save image Uri as string */
+            val editor: SharedPreferences.Editor = context!!.getSharedPreferences(
+                context!!.getString(R.string.preference_file_key), Context.MODE_PRIVATE).edit()
+            editor.putString("background_uri", imageUri.toString())
+            editor.apply()
+
             background = MediaStore.Images.Media.getBitmap(this.context!!.contentResolver, imageUri)
 
             saveTheme(this.context!!, "custom")