Disable disk caching when using MediaStore

Since the MediaStore covers are already cached by the android system, disable the auto-caching that Coil uses to save space.

app/src/main/java/org/oxycblt/auxio/MainActivity.kt

@@ -8,6 +8,8 @@ import android.view.WindowInsets
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.databinding.DataBindingUtil
+import coil.Coil
+import org.oxycblt.auxio.coil.createImageLoader
 import org.oxycblt.auxio.databinding.ActivityMainBinding
 import org.oxycblt.auxio.playback.PlaybackService
 import org.oxycblt.auxio.settings.SettingsManager
@@ -39,6 +41,8 @@ class MainActivity : AppCompatActivity() {
         if (isEdgeOn()) {
             doEdgeToEdgeSetup(binding)
         }
+
+        Coil.setImageLoader(createImageLoader(applicationContext))
     }
 
     override fun onStart() {

app/src/main/java/org/oxycblt/auxio/coil/CoilUtils.kt

@@ -3,10 +3,13 @@ package org.oxycblt.auxio.coil
 import android.content.Context
 import android.graphics.Bitmap
 import android.net.Uri
+import android.util.Log
 import android.widget.ImageView
 import androidx.core.graphics.drawable.toBitmap
 import androidx.databinding.BindingAdapter
 import coil.Coil
+import coil.ImageLoader
+import coil.request.CachePolicy
 import coil.request.ImageRequest
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.logE
@@ -24,6 +27,25 @@ val settingsManager: SettingsManager by lazy {
     SettingsManager.getInstance()
 }
 
+/**
+ * Create the custom [ImageLoader] used by Auxio, which doesn't cache album art to the disk by default.
+ */
+fun createImageLoader(context: Context): ImageLoader {
+    Log.d("createImageLoader", "Creating image loader.")
+
+    val builder = ImageLoader.Builder(context)
+        .crossfade(true)
+
+    // To save memory/improve speed, allow disc caching when if quality covers are enabled.
+    if (settingsManager.useQualityCovers) {
+        builder.diskCachePolicy(CachePolicy.ENABLED)
+    } else {
+        builder.diskCachePolicy(CachePolicy.DISABLED)
+    }
+
+    return builder.build()
+}
+
 /**
  * Get a bitmap for a song. onDone will be called when the bitmap is loaded.
  * **Do not use this on the UI elements, instead use the Binding Adapters.**

app/src/main/res/values/strings.xml

@@ -68,7 +68,7 @@
     <string name="setting_show_covers_desc">Turn off to save memory usage</string>
 
     <string name="setting_quality_covers">Ignore MediaStore covers</string>
-    <string name="setting_quality_covers_desc">Results in higher quality album covers, but causes slower loading times</string>
+    <string name="setting_quality_covers_desc">Results in higher quality album covers at the cost of slower loading times and higher memory usage</string>
 
     <string name="setting_use_alt_action">Use alternate notification action</string>
     <string name="setting_use_alt_loop">Prefer repeat mode action</string>