Adapt colors based on chosen medicine background color

Futsch1 · Feb 19, 2024 · 1e545ce · 1e545ce
1 parent e6f18d4
commit 1e545ce
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Showing 4 changed files with 62 additions and 8 deletions.
diff --git a/app/src/main/java/com/futsch1/medtimer/helpers/ViewColorHelper.java b/app/src/main/java/com/futsch1/medtimer/helpers/ViewColorHelper.java
@@ -0,0 +1,53 @@
+package com.futsch1.medtimer.helpers;
+
+import android.content.Context;
+import android.util.TypedValue;
+import android.widget.Button;
+import android.widget.TextView;
+
+import androidx.core.graphics.ColorUtils;
+
+import com.google.android.material.card.MaterialCardView;
+
+public class ViewColorHelper {
+    public static void setCardBackground(MaterialCardView cardView, TextView[] textViews, int backgroundColor) {
+        int defaultTextViewColor = getThemeColor(cardView.getContext(), com.google.android.material.R.attr.colorOnSurfaceVariant);
+        double contrastTextView = ColorUtils.calculateContrast(defaultTextViewColor, backgroundColor);
+        int cardDefaultBackground = getThemeColor(cardView.getContext(), com.google.android.material.R.attr.colorSurface);
+        double contrastBackground = ColorUtils.calculateContrast(cardDefaultBackground, backgroundColor);
+        setTextColor(textViews, contrastTextView < contrastBackground ? cardDefaultBackground : defaultTextViewColor);
+        cardView.setCardBackgroundColor(backgroundColor);
+    }
+
+    private static int getThemeColor(Context context, int attribute) {
+        TypedValue themeColor = new TypedValue();
+        context.getTheme().resolveAttribute(attribute, themeColor, true);
+        return themeColor.data;
+    }
+
+    private static void setTextColor(TextView[] textViews, int color) {
+        for (TextView textView : textViews) {
+            textView.setTextColor(color);
+        }
+    }
+
+    public static void setButtonBackground(Button button, int backgroundColor) {
+        int primaryColor = getThemeColor(button.getContext(), com.google.android.material.R.attr.colorPrimary);
+        int onPrimaryColor = getThemeColor(button.getContext(), com.google.android.material.R.attr.colorOnPrimary);
+        double primaryContrast = ColorUtils.calculateContrast(primaryColor, backgroundColor);
+        double onPrimaryContrast = ColorUtils.calculateContrast(onPrimaryColor, backgroundColor);
+        setTextColor(button, primaryContrast > onPrimaryContrast ? primaryColor : onPrimaryColor);
+        button.setBackgroundColor(backgroundColor);
+    }
+
+    private static void setTextColor(Button button, int buttonTextColor) {
+        button.setTextColor(buttonTextColor);
+    }
+
+    public static void setDefaultColors(MaterialCardView cardView, TextView[] textViews) {
+        int defaultTextViewColor = getThemeColor(cardView.getContext(), com.google.android.material.R.attr.colorOnSurfaceVariant);
+        int cardDefaultBackground = getThemeColor(cardView.getContext(), com.google.android.material.R.attr.colorSurface);
+        cardView.setCardBackgroundColor(cardDefaultBackground);
+        setTextColor(textViews, defaultTextViewColor);
+    }
+}
diff --git a/app/src/main/java/com/futsch1/medtimer/medicine/EditMedicine.java b/app/src/main/java/com/futsch1/medtimer/medicine/EditMedicine.java
@@ -35,6 +35,7 @@
 import com.futsch1.medtimer.database.Medicine;
 import com.futsch1.medtimer.database.Reminder;
 import com.futsch1.medtimer.helpers.SwipeHelper;
+import com.futsch1.medtimer.helpers.ViewColorHelper;
 import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton;
 import com.google.android.material.switchmaterial.SwitchMaterial;
 import com.google.android.material.textfield.TextInputEditText;
@@ -86,14 +87,14 @@ protected void onCreate(Bundle savedInstanceState) {
 
         color = getIntent().getIntExtra(EXTRA_COLOR, Color.DKGRAY);
         colorButton = findViewById(R.id.selectColor);
-        colorButton.setBackgroundColor(color);
+        ViewColorHelper.setButtonBackground(colorButton, color);
         colorButton.setOnClickListener(v -> {
             ColorPickerDialog.Builder builder = new ColorPickerDialog.Builder(this)
                     .setTitle(R.string.color)
                     .setPositiveButton(getString(R.string.confirm),
                             (ColorEnvelopeListener) (envelope, fromUser) -> {
                                 color = envelope.getColor();
-                                colorButton.setBackgroundColor(color);
+                                ViewColorHelper.setButtonBackground(colorButton, color);
                                 Toast.makeText(this, R.string.change_color_toast, Toast.LENGTH_LONG).show();
                             })
                     .setNegativeButton(getString(R.string.cancel),

diff --git a/app/src/main/java/com/futsch1/medtimer/medicine/MedicineViewHolder.java b/app/src/main/java/com/futsch1/medtimer/medicine/MedicineViewHolder.java
@@ -20,6 +20,7 @@
 import com.futsch1.medtimer.R;
 import com.futsch1.medtimer.database.MedicineWithReminders;
 import com.futsch1.medtimer.helpers.TimeHelper;
+import com.futsch1.medtimer.helpers.ViewColorHelper;
 import com.google.android.material.card.MaterialCardView;
 
 import java.util.ArrayList;
@@ -81,10 +82,9 @@ public void bind(MedicineWithReminders medicineWithReminders, DeleteCallback del
         itemView.setOnClickListener(view -> startEditActivity(medicineWithReminders));
 
         if (medicineWithReminders.medicine.useColor) {
-            ((MaterialCardView) itemView).setCardBackgroundColor(medicineWithReminders.medicine.color);
+            ViewColorHelper.setCardBackground((MaterialCardView) itemView, new TextView[]{medicineNameView, remindersSummaryView}, medicineWithReminders.medicine.color);
         } else {
-            int defaultColor = new MaterialCardView(itemView.getContext()).getCardBackgroundColor().getDefaultColor();
-            ((MaterialCardView) itemView).setCardBackgroundColor(defaultColor);
+            ViewColorHelper.setDefaultColors((MaterialCardView) itemView, new TextView[]{medicineNameView, remindersSummaryView});
         }
     }
 

diff --git a/app/src/main/java/com/futsch1/medtimer/overview/LatestRemindersViewHolder.java b/app/src/main/java/com/futsch1/medtimer/overview/LatestRemindersViewHolder.java
@@ -10,6 +10,7 @@
 
 import com.futsch1.medtimer.R;
 import com.futsch1.medtimer.database.ReminderEvent;
+import com.futsch1.medtimer.helpers.ViewColorHelper;
 import com.futsch1.medtimer.reminders.ReminderProcessor;
 import com.google.android.material.card.MaterialCardView;
 import com.google.android.material.chip.Chip;
@@ -66,10 +67,9 @@ public void bind(ReminderEvent reminderEvent) {
         });
 
         if (reminderEvent.useColor) {
-            ((MaterialCardView) itemView).setCardBackgroundColor(reminderEvent.color);
+            ViewColorHelper.setCardBackground((MaterialCardView) itemView, new TextView[]{reminderEventText}, reminderEvent.color);
         } else {
-            int defaultColor = new MaterialCardView(itemView.getContext()).getCardBackgroundColor().getDefaultColor();
-            ((MaterialCardView) itemView).setCardBackgroundColor(defaultColor);
+            ViewColorHelper.setDefaultColors((MaterialCardView) itemView, new TextView[]{reminderEventText});
         }
     }
 }