Android自定義view實現仿抖音點贊效果

2019-10-22 18:10:46

字體：大中小

來源：轉載

供稿：網友

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：

Android,仿抖音,點贊,抖音點擊量,自定義view

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：