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Load thumbnails on main screen asynchronously

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Decoding a bitmap can be slow. On slow devices, loading all the images
as soon as the card should be shown can lead to UI freezes.

By loading the thumbnail asynchronously, scrolling quickly remains
smooth even on slow devices.
This commit is contained in:
Sylvia van Os
2024-06-16 11:25:20 +02:00
parent 5f5280e2a6
commit 0431803336
2 changed files with 24 additions and 8 deletions
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31
app/src/main/java/protect/card_locker/LoyaltyCardCursorAdapter.java
View File

@@ -6,6 +6,8 @@ import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Looper;
import android.util.SparseBooleanArray;
import android.util.TypedValue;
import android.view.HapticFeedbackConstants;
@@ -88,9 +90,29 @@ public class LoyaltyCardCursorAdapter extends BaseCursorAdapter<LoyaltyCardCurso
inputHolder.mDivider.setVisibility(View.GONE);
LoyaltyCard loyaltyCard = LoyaltyCard.toLoyaltyCard(inputCursor);
Bitmap icon = Utils.retrieveCardImage(mContext, loyaltyCard.id, ImageLocationType.icon);
if (mLoyaltyCardListDisplayOptions.showingNameBelowThumbnail() && icon != null) {
inputHolder.mCardIcon.setContentDescription(loyaltyCard.store);
// Default header at first, real icon will be retrieved asynchronously if it exists to ensure
// smooth scrolling even on slower devices
Utils.setIconOrTextWithBackground(mContext, loyaltyCard, null, inputHolder.mCardIcon, inputHolder.mCardText);
inputHolder.toggleCardStateIcon(loyaltyCard.starStatus != 0, loyaltyCard.archiveStatus != 0, itemSelected(inputCursor.getPosition()));
boolean hasIcon = Utils.retrieveCardImageAsFile(mContext, loyaltyCard.id, ImageLocationType.icon).exists();
if (hasIcon) {
new Thread() {
@Override
public void run() {
Bitmap icon = Utils.retrieveCardImage(mContext, loyaltyCard.id, ImageLocationType.icon);
new Handler(Looper.getMainLooper()).post(() -> {
inputHolder.mIconBackgroundColor = Utils.setIconOrTextWithBackground(mContext, loyaltyCard, icon, inputHolder.mCardIcon, inputHolder.mCardText);
inputHolder.toggleCardStateIcon(loyaltyCard.starStatus != 0, loyaltyCard.archiveStatus != 0, itemSelected(inputHolder.getAdapterPosition()));
});
}
}.start();
}
if (mLoyaltyCardListDisplayOptions.showingNameBelowThumbnail() && hasIcon) {
showDivider = true;
inputHolder.setStoreField(loyaltyCard.store);
} else {
@@ -122,11 +144,6 @@ public class LoyaltyCardCursorAdapter extends BaseCursorAdapter<LoyaltyCardCurso
inputHolder.setExtraField(inputHolder.mExpiryField, null, null, false);
}
inputHolder.mCardIcon.setContentDescription(loyaltyCard.store);
inputHolder.mIconBackgroundColor = Utils.setIconOrTextWithBackground(mContext, loyaltyCard, icon, inputHolder.mCardIcon, inputHolder.mCardText);
inputHolder.toggleCardStateIcon(loyaltyCard.starStatus != 0, loyaltyCard.archiveStatus != 0, itemSelected(inputCursor.getPosition()));
inputHolder.itemView.setActivated(mSelectedItems.get(inputCursor.getPosition(), false));
applyIconAnimation(inputHolder, inputCursor.getPosition());
applyClickEvents(inputHolder, inputCursor.getPosition());

1
app/src/main/res/layout/loyalty_card_layout.xml
View File

@@ -29,7 +29,6 @@
android:layout_height="match_parent"
android:contentDescription="@string/thumbnailDescription"
android:scaleType="fitCenter"
android:src="@mipmap/ic_launcher"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"