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/*
* 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;
/**
* 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 Bouncer1 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bouncer1);
}
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();
// In this variation, we put the shape into an infinite bounce, where it keeps moving
// up and down. Note that it's still not actually "bouncing" because it just uses
// default time interpolation.
anim.setRepeatCount(ValueAnimator.INFINITE);
anim.setRepeatMode(ValueAnimator.REVERSE);
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;
}
}
}
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