CircleImageView.java revision 96dfc170940d2f7218317242115eda1273863966 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.v4.widget;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.graphics.Canvas;
22import android.graphics.Paint;
23import android.graphics.RadialGradient;
24import android.graphics.Shader;
25import android.graphics.drawable.ShapeDrawable;
26import android.graphics.drawable.shapes.OvalShape;
27import android.support.v4.view.ViewCompat;
28import android.view.animation.Animation;
29import android.widget.ImageView;
30
31/**
32 * Private class created to work around issues with AnimationListeners being
33 * called before the animation is actually complete and support shadows on older platforms.
34 */
35class CircleImageView extends ImageView {
36
37    private static final int KEY_SHADOW_COLOR = 0x1E000000;
38    private static final int FILL_SHADOW_COLOR = 0x3D000000;
39    // PX
40    private static final float X_OFFSET = 0f;
41    private static final float Y_OFFSET = 1.75f;
42    private static final float SHADOW_RADIUS = 3.5f;
43    private static final int SHADOW_ELEVATION = 4;
44
45    private Animation.AnimationListener mListener;
46
47    public CircleImageView(Context context, int color, final float radius) {
48        super(context);
49        final float density = getContext().getResources().getDisplayMetrics().density;
50        final int diameter = (int) (radius * density * 2);
51        final int shadowRadius = (int) (density * SHADOW_RADIUS);
52        final int shadowYOffset = (int) (density * Y_OFFSET);
53        final int shadowXOffset = (int) (density * X_OFFSET);
54        ShapeDrawable circle;
55        if (android.os.Build.VERSION.CODENAME.equals("L")
56                || android.os.Build.VERSION.SDK_INT > 21) {
57            circle = new ShapeDrawable(new OvalShape());
58            ViewCompat.setElevation(this, SHADOW_ELEVATION * density);
59        } else {
60            OvalShape oval = new OvalShape() {
61                Paint shadowPaint = new Paint();
62                RadialGradient gradient;
63
64                @Override
65                public void draw(Canvas canvas, Paint paint) {
66                    if (gradient == null) {
67                        gradient = new RadialGradient(diameter/2, diameter/2, shadowRadius,
68                                new int[]{FILL_SHADOW_COLOR, 0x00000000},
69                                null, Shader.TileMode.CLAMP);
70                        shadowPaint.setShader(gradient);
71                    }
72                    canvas.drawCircle(diameter / 2, diameter / 2, (diameter / 2), shadowPaint);
73                    canvas.drawCircle(diameter / 2, diameter / 2, (diameter / 2 - shadowRadius),
74                            paint);
75                }
76            };
77            circle = new ShapeDrawable(oval);
78            ViewCompat.setLayerType(this, ViewCompat.LAYER_TYPE_SOFTWARE, circle.getPaint());
79            circle.getPaint().setShadowLayer(shadowRadius, shadowXOffset, shadowYOffset, KEY_SHADOW_COLOR);
80            final int padding = (int) (shadowRadius / 2);
81            // set padding so the inner image sits correctly within the shadow.
82            setPadding(padding, padding, padding, padding);
83        }
84        circle.getPaint().setColor(color);
85        setBackgroundDrawable(circle);
86    }
87
88    public void setAnimationListener(Animation.AnimationListener listener) {
89        mListener = listener;
90    }
91
92    @Override
93    public void onAnimationStart() {
94        super.onAnimationStart();
95        if (mListener != null) {
96            mListener.onAnimationStart(getAnimation());
97        }
98    }
99
100    @Override
101    public void onAnimationEnd() {
102        super.onAnimationEnd();
103        if (mListener != null) {
104            mListener.onAnimationEnd(getAnimation());
105        }
106    }
107
108    /**
109     * Update the background color of the circle image view.
110     */
111    public void setBackgroundColor(int colorRes) {
112        if (getBackground() instanceof ShapeDrawable) {
113            final Resources res = getResources();
114            ((ShapeDrawable) getBackground()).getPaint().setColor(res.getColor(colorRes));
115        }
116    }
117}
118