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
|
/*
* Copyright (C) 2013 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.bouncer;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
/**
* See the comments in Bouncer for the overall functionality of this app. Changes for this
* variation are down in the animation setup code.
*/
public class Bouncer2 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bouncer2);
}
static class MyView extends View {
Bitmap mBitmap;
Paint paint = new Paint();
int mShapeX, mShapeY;
int mShapeW, mShapeH;
public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setupShape();
}
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
setupShape();
}
public MyView(Context context) {
super(context);
setupShape();
}
public void setShapeX(int shapeX) {
int minX = mShapeX;
int maxX = mShapeX + mShapeW;
mShapeX = shapeX;
minX = Math.min(mShapeX, minX);
maxX = Math.max(mShapeX + mShapeW, maxX);
invalidate(minX, mShapeY, maxX, mShapeY + mShapeH);
}
public void setShapeY(int shapeY) {
int minY = mShapeY;
int maxY = mShapeY + mShapeH;
mShapeY = shapeY;
minY = Math.min(mShapeY, minY);
maxY = Math.max(mShapeY + mShapeH, maxY);
invalidate(mShapeX, minY, mShapeX + mShapeW, maxY);
}
private void setupShape() {
mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.electricsheep);
mShapeW = mBitmap.getWidth();
mShapeH = mBitmap.getHeight();
setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startAnimation();
}
});
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mShapeX = (w - mBitmap.getWidth()) / 2;
mShapeY = 0;
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(mBitmap, mShapeX, mShapeY, paint);
}
void startAnimation() {
ValueAnimator anim = getValueAnimator();
anim.setRepeatCount(ValueAnimator.INFINITE);
anim.setRepeatMode(ValueAnimator.REVERSE);
// This variation finally has the shape bouncing, due to the use of an
// AccelerateInterpolator, which speeds up as the animation proceed. Note that
// when the animation reverses, the interpolator acts in reverse, decelerating
// movement.
anim.setInterpolator(new AccelerateInterpolator());
anim.start();
}
ValueAnimator getValueAnimator() {
ValueAnimator anim = ValueAnimator.ofFloat(0, 1);
anim.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
setShapeY((int) (animation.getAnimatedFraction() * (getHeight() - mShapeH)));
}
});
return anim;
}
}
}
|
