Make gallery tag round side rect

app/src/main/java/com/hippo/drawable/RoundSideRectDrawable.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2016 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.drawable;
+
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.drawable.Drawable;
+
+public class RoundSideRectDrawable extends Drawable {
+
+    private final Paint mPaint;
+    private final Path mPath;
+    private final RectF mTempRectF;
+
+    public RoundSideRectDrawable(int color) {
+        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
+        mPaint.setColor(color);
+        mPath = new Path();
+        mTempRectF = new RectF();
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        int width = bounds.width();
+        int height = bounds.height();
+        RectF rectF = mTempRectF;
+        Path path = mPath;
+
+        path.reset();
+        if (width > height) {
+            int radius = height / 2;
+            path.moveTo(bounds.right - radius, bounds.top);
+            rectF.set(bounds.right - height, bounds.top, bounds.right, bounds.bottom);
+            path.arcTo(rectF, -90.0f, 180.0f, false);
+            path.lineTo(bounds.left + radius, bounds.bottom);
+            rectF.set(bounds.left, bounds.top, bounds.left + height, bounds.bottom);
+            path.arcTo(rectF, 90.0f, 180.0f, false);
+            path.lineTo(bounds.right - radius, bounds.top);
+        } else if (width == height) {
+            path.addCircle(bounds.centerX(), bounds.centerY(), width / 2, Path.Direction.CW);
+        } else {
+            // TODO
+        }
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        canvas.drawPath(mPath, mPaint);
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        mPaint.setAlpha(alpha);
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter colorFilter) {
+        mPaint.setColorFilter(colorFilter);
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.OPAQUE;
+    }
+}