MainActivity
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}catch (Exception e){
Log.d("TAG","异常"+e);
}
final ParticleView particleAnimator = new ParticleView(MainActivity.this,1000);
particleAnimator.setOnAnimationListener(new ParticleView.OnAnimationListener() {
@Override
public void onAnimationStart(View view, Animator animation) {
view.setVisibility(View.INVISIBLE);
}
@Override
public void onAnimationEnd(View view,Animator animation) {
}
});
findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v1) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
findViewById(R.id.haha).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
particleAnimator.boom(v1);
particleAnimator.boom(v);
}
});
}
});
findViewById(R.id.haha).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v1) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
particleAnimator.boom(v1);
particleAnimator.boom(v);
}
});
}
});
findViewById(R.id.btn1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v1) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
findViewById(R.id.btn2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
particleAnimator.boom(v1);
particleAnimator.boom(v);
}
});
}
});
findViewById(R.id.btn2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v1) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
findViewById(R.id.btn1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"haha",Toast.LENGTH_SHORT).show();
particleAnimator.boom(v1);
particleAnimator.boom(v);
}
});
}
});
}
}
Particle
public class Particle {
//默认小球宽高
public static final int PART_WH = 8;
//x值
public float cx;
//y值
public float cy;
//绘制圆的半径
public float radius;
//颜色
public int color;
//透明度
public float alpha;
//用于生成随机数
static Random random = new Random();
//粒子所在的矩形区域
public Rect mBound;
public static Particle generateParticle(int color, Rect bound, Point point) {
int row = point.y; //行是高
int column = point.x; //列是宽
Particle particle = new Particle();
particle.mBound = bound;
particle.color = color;
particle.alpha = 1f;
particle.radius = PART_WH;
particle.cx = bound.left + PART_WH * column;
particle.cy = bound.top + PART_WH * row;
return particle;
}
public void update(float factor) {
cx = cx + factor * random.nextInt(mBound.width()) * (random.nextFloat() - 0.5f);
cy = cy + factor * (mBound.height()/(random.nextInt(4)+1)) ;
radius = radius - factor * random.nextInt(3);;
if (radius<=0)
radius = 0;
alpha = 1f - factor;
}
public static Particle[][] generateParticles(Bitmap bitmap, Rect bound) {
int w = bound.width();
int h = bound.height();
int partW_Count = w / Particle.PART_WH;
int partH_Count = h / Particle.PART_WH;
Particle[][] particles = new Particle[partH_Count][partW_Count];
Point point = null;
for (int row = 0; row < partH_Count; row ++) { //行
for (int column = 0; column < partW_Count; column ++) { //列
//取得当前粒子所在位置的颜色
int color = bitmap.getPixel(column * Particle.PART_WH, row * Particle.PART_WH);
point = new Point(column, row); //x是列，y是行
particles[row][column] = Particle.generateParticle(color, bound, point);
}
}
return particles;
}
}
ParticleView
public class ParticleView extends View {
private ValueAnimator mParticleAnimator;
//动画持续时间
public int DURATION = 2000;
//动画监听
private OnAnimationListener mOnAnimationListener;
//画笔
private Paint mPaint;
//所有粒子
private Particle[][] mParticles;
public void setOnAnimationListener(OnAnimationListener mOnAnimationListener) {
this.mOnAnimationListener = mOnAnimationListener;
}
public ParticleView(Context context) {
super(context);
init();
}
/**
*
* @param context
* @param durtion 动画时间
*/
public ParticleView(Context context, int durtion) {
super(context);
this.DURATION = durtion;
init();
}
public ParticleView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
attachToActivity((Activity) getContext());
mPaint = new Paint();
}
@Override
protected void onDraw(Canvas canvas) {
if (mParticleAnimator !=null)
drawParticle(canvas);
}
public void drawParticle(Canvas canvas) {
for (Particle[] particle : mParticles) {
for (Particle p : particle) {
p.update((Float) mParticleAnimator.getAnimatedValue());
mPaint.setColor(p.color);
mPaint.setAlpha((int) (Color.alpha(p.color) * p.alpha));
canvas.drawCircle(p.cx, p.cy, p.radius, mPaint);//
}
}
}
public void boom(final View view) {
if(view.getVisibility()!=View.VISIBLE||view.getAlpha()==0 ||(mParticleAnimator!=null && mParticleAnimator.isRunning())){
return;
}
view.post(new Runnable() {
@Override
public void run() {
int[] location = new int[2];
view.getLocationInWindow(location);
Rect rect = new Rect(location[0],location[1],location[0]+view.getMeasuredWidth(),location[1]+view.getMeasuredHeight());
mParticles = Particle.generateParticles(getCacheBitmapFromView(view), rect);
mParticleAnimator = ValueAnimator.ofFloat(0.0f, 1.0f);
mParticleAnimator.setDuration(DURATION);
mParticleAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
if (mOnAnimationListener!=null)
mOnAnimationListener.onAnimationStart(view,animation);
}
@Override
public void onAnimationEnd(Animator animation) {
if (mOnAnimationListener!=null)
mOnAnimationListener.onAnimationEnd(view,animation);
}
});
mParticleAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
invalidate();
}
});
mParticleAnimator.start();
}
});
}
/**
* 获取一个 View 的缓存视图
*
* @param view
* @return
*/
private Bitmap getCacheBitmapFromView(View view) {
final boolean drawingCacheEnabled = true;
view.setDrawingCacheEnabled(drawingCacheEnabled);
view.buildDrawingCache(drawingCacheEnabled);
final Bitmap drawingCache = view.getDrawingCache();
Bitmap bitmap;
if (drawingCache != null) {
bitmap = Bitmap.createBitmap(drawingCache);
view.setDrawingCacheEnabled(false);
} else {
bitmap = null;
}
return bitmap;
}
private void attachToActivity(Activity activity) {
ViewGroup rootView = (ViewGroup) activity.getWindow().getDecorView();
ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
rootView.addView(this, lp);
}
public interface OnAnimationListener{
//当前正在执行的view
void onAnimationStart(View v,Animator animation);
void onAnimationEnd(View v,Animator animation);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical"
>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</android.support.v7.widget.Toolbar>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<Button
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_margin="15dp"
android:gravity="center"
android:id="@+id/btn1"
android:text="点我"
/>
<Button
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_margin="15dp"
android:gravity="center"
android:id="@+id/btn2"
android:text="点我"
/>
<Button
android:id="@+id/haha"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_margin="15dp"
android:gravity="center"
android:background="#f60"
android:text="哈哈"
/>
/>
<Button
android:id="@+id/btn"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_margin="15dp"
android:gravity="center"
android:background="#f60"
android:text="哈哈"
/>
</LinearLayout>
</ScrollView>
</LinearLayout>