commit a54e21853248e64b6d340ad885ea68907ea62c3a
author Hyunyoung Song <hyunyoungs@google.com> Fri Oct 02 00:54:36 2020 -0700
committer Hyunyoung Song <hyunyoungs@google.com> Fri Oct 02 00:54:36 2020 -0700
tree cc52a2d2d0045115a53484109c3a32cfde24e298
parent 4e6f138c23382aed42788caf9d125469240761bd

Add createIconBitmap method that takes in placeholder string and the color
Bug: 169796517

Change-Id: I01e69efd30e1ce2cb94e4f774b5dffa55bf058da

iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java

diff --git a/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java b/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java
index 31a923e..e7e47f2 100644
--- a/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java
+++ b/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java
@@ -12,6 +12,7 @@
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
+import android.graphics.Paint;
 import android.graphics.PaintFlagsDrawFilter;
 import android.graphics.Rect;
 import android.graphics.RectF;
@@ -56,6 +57,10 @@
     private Drawable mWrapperIcon;
     private int mWrapperBackgroundColor = DEFAULT_WRAPPER_BACKGROUND;
 
+    private final Paint mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
+    private static final float PLACEHOLDER_TEXT_SIZE = 20f;
+    private static int PLACEHOLDER_BACKGROUND_COLOR = Color.rgb(240, 240, 240);
+
     protected BaseIconFactory(Context context, int fillResIconDpi, int iconBitmapSize,
             boolean shapeDetection) {
         mContext = context.getApplicationContext();
@@ -68,6 +73,10 @@
 
         mCanvas = new Canvas();
         mCanvas.setDrawFilter(new PaintFlagsDrawFilter(DITHER_FLAG, FILTER_BITMAP_FLAG));
+        mTextPaint.setTextAlign(Paint.Align.CENTER);
+        mTextPaint.setColor(PLACEHOLDER_BACKGROUND_COLOR);
+        mTextPaint.setTextSize(context.getResources().getDisplayMetrics().density *
+                PLACEHOLDER_TEXT_SIZE);
         clear();
     }
 
@@ -113,6 +122,28 @@
         return null;
     }
 
+    /**
+     * Create a placeholder icon using the passed in text.
+     *
+     * @param placeholder used for foreground element in the icon bitmap
+     * @param color used for the foreground text color
+     * @return
+     */
+    public BitmapInfo createIconBitmap(String placeholder, int color) {
+        if (!ATLEAST_OREO) return null;
+
+        Bitmap placeholderBitmap = Bitmap.createBitmap(mIconBitmapSize, mIconBitmapSize,
+                Bitmap.Config.ARGB_8888);
+        mTextPaint.setColor(color);
+        Canvas canvas = new Canvas(placeholderBitmap);
+        canvas.drawText(placeholder, mIconBitmapSize / 2, mIconBitmapSize * 5 / 8, mTextPaint);
+        AdaptiveIconDrawable drawable = new AdaptiveIconDrawable(
+                new ColorDrawable(PLACEHOLDER_BACKGROUND_COLOR),
+                new BitmapDrawable(mContext.getResources(), placeholderBitmap));
+        Bitmap icon = createIconBitmap(drawable, 1f);
+        return BitmapInfo.of(icon, extractColor(icon));
+    }
+
     public BitmapInfo createIconBitmap(Bitmap icon) {
         if (mIconBitmapSize != icon.getWidth() || mIconBitmapSize != icon.getHeight()) {
             icon = createIconBitmap(new BitmapDrawable(mContext.getResources(), icon), 1f);