1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.example.android.apis.animation;
// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import android.animation.ObjectAnimator;
import android.animation.TypeEvaluator;
import android.animation.ValueAnimator;
import com.example.android.apis.R;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.Shader;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
public class CustomEvaluator extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.animator_custom_evaluator);
LinearLayout container = (LinearLayout) findViewById(R.id.container);
final MyAnimationView animView = new MyAnimationView(this);
container.addView(animView);
Button starter = (Button) findViewById(R.id.startButton);
starter.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
animView.startAnimation();
}
});
}
public class XYHolder {
private float mX;
private float mY;
public XYHolder(float x, float y) {
mX = x;
mY = y;
}
public float getX() {
return mX;
}
public void setX(float x) {
mX = x;
}
public float getY() {
return mY;
}
public void setY(float y) {
mY = y;
}
}
public class XYEvaluator implements TypeEvaluator {
public Object evaluate(float fraction, Object startValue, Object endValue) {
XYHolder startXY = (XYHolder) startValue;
XYHolder endXY = (XYHolder) endValue;
return new XYHolder(startXY.getX() + fraction * (endXY.getX() - startXY.getX()),
startXY.getY() + fraction * (endXY.getY() - startXY.getY()));
}
}
public class BallXYHolder {
private ShapeHolder mBall;
public BallXYHolder(ShapeHolder ball) {
mBall = ball;
}
public void setXY(XYHolder xyHolder) {
mBall.setX(xyHolder.getX());
mBall.setY(xyHolder.getY());
}
public XYHolder getXY() {
return new XYHolder(mBall.getX(), mBall.getY());
}
}
public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener {
public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
ValueAnimator bounceAnim = null;
ShapeHolder ball = null;
BallXYHolder ballHolder = null;
public MyAnimationView(Context context) {
super(context);
ball = createBall(25, 25);
ballHolder = new BallXYHolder(ball);
}
private void createAnimation() {
if (bounceAnim == null) {
XYHolder startXY = new XYHolder(0f, 0f);
XYHolder endXY = new XYHolder(300f, 500f);
bounceAnim = ObjectAnimator.ofObject(ballHolder, "xY",
new XYEvaluator(), endXY);
bounceAnim.setDuration(1500);
bounceAnim.addUpdateListener(this);
}
}
public void startAnimation() {
createAnimation();
bounceAnim.start();
}
private ShapeHolder createBall(float x, float y) {
OvalShape circle = new OvalShape();
circle.resize(50f, 50f);
ShapeDrawable drawable = new ShapeDrawable(circle);
ShapeHolder shapeHolder = new ShapeHolder(drawable);
shapeHolder.setX(x - 25f);
shapeHolder.setY(y - 25f);
int red = (int)(Math.random() * 255);
int green = (int)(Math.random() * 255);
int blue = (int)(Math.random() * 255);
int color = 0xff000000 | red << 16 | green << 8 | blue;
Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG);
int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
50f, color, darkColor, Shader.TileMode.CLAMP);
paint.setShader(gradient);
shapeHolder.setPaint(paint);
return shapeHolder;
}
@Override
protected void onDraw(Canvas canvas) {
canvas.save();
canvas.translate(ball.getX(), ball.getY());
ball.getShape().draw(canvas);
canvas.restore();
}
public void onAnimationUpdate(ValueAnimator animation) {
invalidate();
}
}
}
|
