前言
學習自定義view，想找點東西耍一下，剛好看到抖音的點贊效果不錯，嘗試一下。
抖音效果：
抖音效果
話不多說，先上代碼：
public class Love extends RelativeLayout {
private Context mContext;
float[] num = {-30, -20, 0, 20, 30};//隨機心形圖片角度
public Love(Context context) {
super(context);
initView(context);
}
public Love(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
initView(context);
}
public Love(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView(context);
}
private void initView(Context context) {
mContext = context;
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
ImageView imageView = new ImageView(mContext);
LayoutParams params = new LayoutParams(100, 100);
params.leftMargin = getWidth() - 200;
params.topMargin = getHeight() / 2 - 300;
imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));
imageView.setLayoutParams(params);
addView(imageView);
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(mContext, "這里是點擊愛心的動畫，待展示", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onTouchEvent(MotionEvent event) {
final ImageView imageView = new ImageView(mContext);
LayoutParams params = new LayoutParams(300, 300);
params.leftMargin = (int) event.getX() - 150;
params.topMargin = (int) event.getY() - 300;
imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));
imageView.setLayoutParams(params);
addView(imageView);
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.play(scale(imageView, "scaleX", 2f, 0.9f, 100, 0))
.with(scale(imageView, "scaleY", 2f, 0.9f, 100, 0))
.with(rotation(imageView, 0, 0, num[new Random().nextInt(4)]))
.with(alpha(imageView, 0, 1, 100, 0))
.with(scale(imageView, "scaleX", 0.9f, 1, 50, 150))
.with(scale(imageView, "scaleY", 0.9f, 1, 50, 150))
.with(translationY(imageView, 0, -600, 800, 400))
.with(alpha(imageView, 1, 0, 300, 400))
.with(scale(imageView, "scaleX", 1, 3f, 700, 400))
.with(scale(imageView, "scaleY", 1, 3f, 700, 400));
animatorSet.start();
animatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
removeViewInLayout(imageView);
}
});
return super.onTouchEvent(event);
}
public static ObjectAnimator scale(View view, String propertyName, float from, float to, long time, long delayTime) {
ObjectAnimator translation = ObjectAnimator.ofFloat(view
, propertyName
, from, to);
translation.setInterpolator(new LinearInterpolator());
translation.setStartDelay(delayTime);
translation.setDuration(time);
return translation;
}
public static ObjectAnimator translationX(View view, float from, float to, long time, long delayTime) {
ObjectAnimator translation = ObjectAnimator.ofFloat(view
, "translationX"
, from, to);
translation.setInterpolator(new LinearInterpolator());
translation.setStartDelay(delayTime);
translation.setDuration(time);
return translation;
}
public static ObjectAnimator translationY(View view, float from, float to, long time, long delayTime) {
ObjectAnimator translation = ObjectAnimator.ofFloat(view
, "translationY"
, from, to);
translation.setInterpolator(new LinearInterpolator());
translation.setStartDelay(delayTime);
translation.setDuration(time);
return translation;
}
public static ObjectAnimator alpha(View view, float from, float to, long time, long delayTime) {
ObjectAnimator translation = ObjectAnimator.ofFloat(view
, "alpha"
, from, to);
translation.setInterpolator(new LinearInterpolator());
translation.setStartDelay(delayTime);
translation.setDuration(time);
return translation;
}
public static ObjectAnimator rotation(View view, long time, long delayTime, float... values) {
ObjectAnimator rotation = ObjectAnimator.ofFloat(view, "rotation", values);
rotation.setDuration(time);
rotation.setStartDelay(delayTime);
rotation.setInterpolator(new TimeInterpolator() {
@Override
public float getInterpolation(float input) {
return input;
}
});
return rotation;
}
}
實現思路
在點擊時觸發將心形的圖片add到整個view中，然后在執行動畫。主要的處理邏輯都在onTouchEvent()事件中，下面我們來詳細講解一下思路和代碼：
@Override
public boolean onTouchEvent(MotionEvent event) {
final ImageView imageView = new ImageView(mContext);
LayoutParams params = new LayoutParams(300, 300);
params.leftMargin = (int) event.getX() - 150;
params.topMargin = (int) event.getY() - 300;
imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));
imageView.setLayoutParams(params);
addView(imageView);
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.play(scale(imageView, "scaleX", 2f, 0.9f, 100, 0))
.with(scale(imageView, "scaleY", 2f, 0.9f, 100, 0))
.with(rotation(imageView, 0, 0, num[new Random().nextInt(4)]))
.with(alpha(imageView, 0, 1, 100, 0))
.with(scale(imageView, "scaleX", 0.9f, 1, 50, 150))
.with(scale(imageView, "scaleY", 0.9f, 1, 50, 150))
.with(translationY(imageView, 0, -600, 800, 400))
.with(alpha(imageView, 1, 0, 300, 400))
.with(scale(imageView, "scaleX", 1, 3f, 700, 400))
.with(scale(imageView, "scaleY", 1, 3f, 700, 400));
animatorSet.start();
animatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
removeViewInLayout(imageView);
}
});
return super.onTouchEvent(event);
}
- 首先，我們需要在觸摸事件中做監聽，當有觸摸時，創建一個展示心形圖片的ImageView。
final ImageView imageView = new ImageView(mContext);
imageView.setImageDrawable(getResources().getDrawable(R.drawable.heart_red));//設置紅色心形圖片
- 設置圖片展示的位置，是需要在手指觸摸的位置上方，即觸摸點是心形的下方角的位置。所以我們需要將ImageView設置到手指的位置
LayoutParams params = new LayoutParams(300, 300);
params.leftMargin = (int) event.getX() - 150;
params.topMargin = (int) event.getY() - 300;
imageView.setLayoutParams(params);
- 給imageView add到父view中。
addView(imageView);
- 設置imageView動畫
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.play(scale(imageView, "scaleX", 2f, 0.9f, 100, 0))//縮放動畫，X軸2倍縮小至0.9倍
.with(scale(imageView, "scaleY", 2f, 0.9f, 100, 0))//縮放動畫，Y軸2倍縮小至0.9倍
.with(rotation(imageView, 0, 0, num[new Random().nextInt(4)]))//旋轉動畫，隨機旋轉角度num={-30.-20，0，20，30}
.with(alpha(imageView, 0, 1, 100, 0))//漸變透明度動畫，透明度從0-1.
.with(scale(imageView, "scaleX", 0.9f, 1, 50, 150))//縮放動畫，X軸0.9倍縮小至1倍
.with(scale(imageView, "scaleY", 0.9f, 1, 50, 150))//縮放動畫，Y軸0.9倍縮小至1倍
.with(translationY(imageView, 0, -600, 800, 400))//平移動畫，Y軸從0向上移動600單位
.with(alpha(imageView, 1, 0, 300, 400))//透明度動畫，從1-0
.with(scale(imageView, "scaleX", 1, 3f, 700, 400))//縮放動畫，X軸1倍放大至3倍
.with(scale(imageView, "scaleY", 1, 3f, 700, 400));//縮放動畫，Y軸1倍放大至3倍
animatorSet.start();
- 當然，我們不可能無限制的增加view，在view消失之后，需要手動的移除改ImageView。
animatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
removeViewInLayout(imageView);
}
});
效果如下：
這里寫圖片描述
右側愛心點贊的效果容我先搞出來，下期在上咯！
有問題和想法，歡迎私信或者評論留言，一起學習，一起進步
