Android special effect album (8)-implement the special effects of heart bubbles and dancing, so that your APP can be instantly refreshed

Source: Internet
Author: User

Android special effect album (8)-implement the special effects of heart bubbles and dancing, so that your APP can be instantly refreshed
Android special effect album (8)-implement the special effects of heart bubbles and dancing, so that your APP can be instantly refreshed

The Annual leave will also be put soon. It is estimated that there will be no Internet access at home. If this is the case, it may be a year later. However, during this period, the updated content will be saved locally, in this way, the website can be published, which is also excellent. The special effect described today was originally a little egg on Only. Let's take a look at the picture.

As long as I click the word "Only", the following will start to rise and bubble up. This is actually a cover-up animation. Prepare three different-colored heart-shaped pictures. In this case, let's start writing it!
Create a new project -- HeartFaom <喎?http: kf ware vc " target="_blank" class="keylink"> Alias + DQo8L2Jsb2NrcXVvdGU + DQo8aDIgaWQ9 "bezierevaluator"> BezierEvaluator

Unit conversion and computing track
Package com. lgl. heartfaom; import android. animation. TypeEvaluator; import android. graphics. PointF; public class BezierEvaluator implements TypeEvaluator  {Private PointF pointF1; private PointF pointF2; public BezierEvaluator (PointF pointF1, PointF pointF2) {this. pointF1 = pointF1; this. pointF2 = pointF2 ;}@ Override public PointF evaluate (float time, PointF startValue, PointF endValue) {float timeLeft = 1.0f-time; PointF point = new PointF (); // result point. x = timeLeft * (startValue. x) + 3 * timeLeft * time * (pointF1.x) + 3 * timeLeft * time * (pointF2.x) + time * (endValue. x); point. y = timeLeft * (startValue. y) + 3 * timeLeft * time * (pointF1.y) + 3 * timeLeft * time * (pointF2.y) + time * (endValue. y); return point ;}} 
Beiser curve calculation and bubble Realization
Package com. lgl. heartfaom; import java. util. random; import android. animation. animator; import android. animation. animatorListenerAdapter; import android. animation. animatorSet; import android. animation. objectAnimator; import android. animation. valueAnimator; import android. annotation. targetApi; import android. content. context; import android. graphics. pointF; import android. graphics. drawable. drawable; import andro Id. OS. build; import android. util. attributeSet; import android. view. view; import android. view. animation. accelerateDecelerateInterpolator; import android. view. animation. accelerateInterpolator; import android. view. animation. decelerateInterpolator; import android. view. animation. interpolator; import android. view. animation. linearInterpolator; import android. widget. imageView; import android. widget. relativeLayout; Public class PeriscopeLayout extends RelativeLayout {private Interpolator line = new LinearInterpolator (); // linear private Interpolator acc = new acceleration (); // accelerate private Interpolator dce = new DecelerateInterpolator (); // slow down private Interpolator accdec = new AccelerateDecelerateInterpolator (); // first accelerate and then slow down private Interpolator [] interpolators; private int mHeight; private int mWidth; priva Te LayoutParams lp; private Drawable [] drawables; private Random random = new Random (); private int dHeight; private int dWidth; public PeriscopeLayout (Context context) {super (context ); init ();} public PeriscopeLayout (Context context, AttributeSet attrs) {super (context, attrs); init ();} public PeriscopeLayout (Context context, AttributeSet attrs, int defStyleAttr) {super (context, attrs, defSty LeAttr); init () ;}@ TargetApi (Build. public PeriscopeLayout (Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super (context, attrs, defStyleAttr, defStyleRes); init ();} private void init () {// initialize the drawables = new Drawable [3]; Drawable red = getResources (). getDrawable (R. drawable. pl_red); Drawable yellow = getResources (). getDrawable (R. drawable. pl _ Yellow); Drawable blue = getResources (). getDrawable (R. drawable. pl_blue); drawables [0] = red; drawables [1] = yellow; drawables [2] = blue; // obtain the width and height of the image for later calculation // note that the size of the three images here is the same, so I only took one dHeight = red. getIntrinsicHeight (); dWidth = red. getIntrinsicWidth (); // bottom and horizontal center lp = new LayoutParams (dWidth, dHeight); lp. addRule (CENTER_HORIZONTAL, TRUE); // here, TRUE is not true lp. addRule (ALIGN_PARENT_BOTTOM, TRUE); // initialize the interpolators = new Interpolator [4]; interpolators [0] = line; interpolators [1] = acc; interpolators [2] = dce; interpolators [3] = accdec;} @ Override protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) {super. onMeasure (widthMeasureSpec, heightMeasureSpec); mWidth = getMeasuredWidth (); mHeight = getMeasuredHeight ();} public void addHeart () {ImageView imageView = New ImageView (getContext (); // select an imageView randomly. setImageDrawable (drawables [random. nextInt (3)]); imageView. setLayoutParams (lp); addView (imageView); Animator set = getAnimator (imageView); set. addListener (new AnimEndListener (imageView); set. start ();} private Animator getAnimator (View target) {AnimatorSet set = getEnterAnimtor (target); ValueAnimator bezierValueAnimator = getBezierValueAnimator (ta Rget); AnimatorSet finalSet = new AnimatorSet (); finalSet. playSequentially (set); finalSet. playSequentially (set, bezierValueAnimator); finalSet. setInterpolator (interpolators [random. nextInt (4)]); finalSet. setTarget (target); return finalSet;} private AnimatorSet getEnterAnimtor (final View target) {ObjectAnimator alpha = ObjectAnimator. ofFloat (target, View. ALPHA, 0.2f, 1f); ObjectAnimator scaleX = O BjectAnimator. ofFloat (target, View. SCALE_X, 0.2f, 1f); ObjectAnimator scaleY = ObjectAnimator. ofFloat (target, View. SCALE_Y, 0.2f, 1f); AnimatorSet enter = new AnimatorSet (); enter. setDuration (500); enter. setInterpolator (new LinearInterpolator (); enter. playTogether (alpha, scaleX, scaleY); enter. setTarget (target); return enter;} private ValueAnimator getBezierValueAnimator (View target) {// initialize a bay Sel calculator--pass BezierEvaluator evaluator = new BezierEvaluator (getPointF (2), getPointF (1 )); // It is best to draw a picture here to understand the input of the start and end ValueAnimator animator = ValueAnimator. ofObject (evaluator, new PointF (mWidth-dWidth)/2, mHeight-dHeight), new PointF (random. nextInt (getWidth (), 0); animator. addUpdateListener (new BezierListenr (target); animator. setTarget (target); animator. setDuration (3000); return animator ;}/*** Get two vertices in the middle ** @ param scale */private PointF getPointF (int scale) {PointF pointF = new PointF (); pointF. x = random. nextInt (mWidth-100); // minus 100 is used to control the activity range of the X axis ~~ // On the Y-axis, to ensure that the second vertex is above the first vertex, I divide Y into the upper half and lower half. In this way, the animation effect is better. You can also use other methods pointF. y = random. nextInt (mHeight-100)/scale; return pointF;} private class BezierListenr implements ValueAnimator. animatorUpdateListener {private View target; public BezierListenr (View target) {this.tar get = target ;}@ Override public void onAnimationUpdate (ValueAnimator animation) {// here, the x y value calculated from the beiser curve is assigned to the view, so that the love will go with the curve. PointF pointF = (PointF) animation. getAnimatedValue (); target. setX (pointF. x); target. setY (pointF. y); // here, by the way, we will make an alpha animation target. setAlpha (1-animation. extends ();} private class AnimEndListener extends AnimatorListenerAdapter {private View target; public AnimEndListener (View target) {this.tar get = target;} @ Override public void onAnimationEnd (Animator animation) {super. onAnimationEnd (animation); // The number of sub-views increases or decreases only because of non-stop add. Therefore, remove removeView (target) after the view animation ends ));}}}
Layout implementation
<Code class = "hljs avrasm"> <relativelayout xmlns: android = "" xmlns: tools = "" android: layout_width = "match_parent" android: layout_height = "match_parent" android: background = "#000"> </relativelayout> </code> <button android: id = "@ + id/btn_start" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_cent Erinparent = "true" android: text = "flying! "> <Code class =" hljs avrasm "> <com. lgl. heartfaom. periscopelayout android: id = "@ + id/periscope" android: layout_width = "match_parent" android: layout_height = "match_parent"> </com. lgl. heartfaom. periscopelayout> </code> </button>
Then there is how to use it.
Package com. lgl. heartfaom; import android. app. activity; import android. OS. bundle; import android. view. view; import android. view. view. onClickListener; import android. widget. button; public class MainActivity extends Activity {private Button btn_start; // heart bubble private PeriscopeLayout periscopeLayout; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); // initialize periscopeLayout = (PeriscopeLayout) findViewById (R. id. perisstart); btn_start = (Button) findViewById (R. id. btn_start); btn_start.setOnClickListener (new OnClickListener () {@ Override public void onClick (View v) {// call periscopeLayout to add bubbles. addHeart ();}});}}

Okay. Now we can run it and try the actual effect.


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