CircleImageView.java revision dd27d55a5152f86c07758067e587bdd5b719abaf 
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
34 * platforms.
35 *
36 * @hide
37 */
38class CircleImageView extends ImageView {
39
40    private static final int KEY_SHADOW_COLOR = 0x1E000000;
41    private static final int FILL_SHADOW_COLOR = 0x3D000000;
42    // PX
43    private static final float X_OFFSET = 0f;
44    private static final float Y_OFFSET = 1.75f;
45    private static final float SHADOW_RADIUS = 3.5f;
46    private static final int SHADOW_ELEVATION = 4;
47
48    private Animation.AnimationListener mListener;
49
50    public CircleImageView(Context context, int color, final float radius) {
51        super(context);
52        final float density = getContext().getResources().getDisplayMetrics().density;
53        final int diameter = (int) (radius * density * 2);
54        final int shadowRadius = (int) (density * SHADOW_RADIUS);
55        final int shadowYOffset = (int) (density * Y_OFFSET);
56        final int shadowXOffset = (int) (density * X_OFFSET);
57        ShapeDrawable circle;
58        if (android.os.Build.VERSION.CODENAME.equals("L")
59                || android.os.Build.VERSION.SDK_INT > 21) {
60            circle = new ShapeDrawable(new OvalShape());
61            ViewCompat.setElevation(this, SHADOW_ELEVATION * density);
62        } else {
63            OvalShape oval = new OvalShape() {
64                Paint shadowPaint = new Paint();
65                RadialGradient gradient;
66
67                @Override
68                public void draw(Canvas canvas, Paint paint) {
69                    if (gradient == null) {
70                        gradient = new RadialGradient(diameter/2, diameter/2, shadowRadius,
71                                new int[]{FILL_SHADOW_COLOR, 0x00000000},
72                                null, Shader.TileMode.CLAMP);
73                        shadowPaint.setShader(gradient);
74                    }
75                    canvas.drawCircle(diameter / 2, diameter / 2, (diameter / 2), shadowPaint);
76                    canvas.drawCircle(diameter / 2, diameter / 2, (diameter / 2 - shadowRadius),
77                            paint);
78                }
79            };
80            circle = new ShapeDrawable(oval);
81            ViewCompat.setLayerType(this, ViewCompat.LAYER_TYPE_SOFTWARE, circle.getPaint());
82            circle.getPaint().setShadowLayer(shadowRadius, shadowXOffset, shadowYOffset, KEY_SHADOW_COLOR);
83            final int padding = (int) (shadowRadius / 2);
84            // set padding so the inner image sits correctly within the shadow.
85            setPadding(padding, padding, padding, padding);
86        }
87        circle.getPaint().setColor(color);
88        setBackgroundDrawable(circle);
89    }
90
91    public void setAnimationListener(Animation.AnimationListener listener) {
92        mListener = listener;
93    }
94
95    @Override
96    public void onAnimationStart() {
97        super.onAnimationStart();
98        if (mListener != null) {
99            mListener.onAnimationStart(getAnimation());
100        }
101    }
102
103    @Override
104    public void onAnimationEnd() {
105        super.onAnimationEnd();
106        if (mListener != null) {
107            mListener.onAnimationEnd(getAnimation());
108        }
109    }
110
111    /**
112     * Update the background color of the circle image view.
113     */
114    public void setBackgroundColor(int colorRes) {
115        if (getBackground() instanceof ShapeDrawable) {
116            final Resources res = getResources();
117            ((ShapeDrawable) getBackground()).getPaint().setColor(res.getColor(colorRes));
118        }
119    }
120}
121