Android实现炫酷播放效果

本文实例为大家分享了Android实现播放效果的具体代码，供大家参考，具体内容如下

一、首先看效果

二、实现原理

使用贝塞尔曲线实现滑动效果，在使用属性动画实现水波纹效果，然后就能实现以上效果

三、实现

1、先封装动画框架，创建动画基础类

PathPoint.java

public class PathPoint {

  public static final int MOVE = 0;
  public static final int LINE = 1;
  public static final int CURVE = 2;
  float mControl0X, mControl0Y;
  float mControl1X, mControl1Y;
  public float mX, mY;
  int mOperation;

  //line/move
  private PathPoint(int operation, float x, float y) {
    this.mOperation = operation;
    this.mX = x;
    this.mY = y;
  }

  //curve
  private PathPoint(float c0X, float c0Y, float c1X, float c1Y, float x, float y) {
    this.mControl0X = c0X;
    this.mControl0Y = c0Y;
    this.mControl1X = c1X;
    this.mControl1Y = c1Y;
    this.mX = x;
    this.mY = y;
    this.mOperation = CURVE;

  }

  public static PathPoint moveTo(float x, float y) {

    return new PathPoint(MOVE, x, y);

  }

  public static PathPoint lineTo(float x, float y) {

    return new PathPoint(LINE, x, y);

  }

  public static PathPoint curveTo(float c0X, float c0Y, float c1X, float c1Y, float x, float y) {

    return new PathPoint(c0X, c0Y, c1X, c1Y, x, y);

  }
}

2、创建动画集合类，并且保存绘制轨迹

AnimatorPath

public class AnimatorPath {
  //记录轨迹
  private List<PathPoint> mPoints = new ArrayList<>();

  public void moveTo(float x, float y) {
    mPoints.add(PathPoint.moveTo(x, y));
  }

  public void lineTo(float x, float y) {
    mPoints.add(PathPoint.lineTo(x, y));
  }

  public void curveTo(float c0X, float c0Y, float c1X, float c1Y, float x, float y) {
    mPoints.add(PathPoint.curveTo(c0X, c0Y, c1X, c1Y, x, y));
  }

  public Collection<PathPoint> getPoints() {
    return mPoints;
  }
}

3、实现页面布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#ffe8e8e8">

  <ImageView
    android:id="@+id/album_cover"
    android:layout_width="match_parent"
    android:layout_height="250dp"
    android:background="#22eeff" />

  <android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    android:layout_below="@id/album_cover"
    android:layout_marginTop="-15dp"
    android:background="@color/colorPrimary"
    android:elevation="4dp"
    android:minHeight="?attr/actionBarSize"
    android:paddingLeft="72dp">

    <LinearLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:gravity="center_vertical"
      android:orientation="vertical">

      <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="sans-serif"
        android:text="大海大海"
        android:textColor="#FFF"
        android:textSize="30sp" />
      <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:fontFamily="sans-serif-light"
        android:text="王小二"
        android:textColor="#9cffffff"
        android:textSize="18sp" />
    </LinearLayout>
  </android.support.v7.widget.Toolbar>

  <FrameLayout
    android:id="@+id/fab_container"
    android:layout_width="match_parent"
    android:layout_height="128dp"
    android:layout_below="@id/album_cover"
    android:layout_marginTop="-30dp"
    android:elevation="10dp">

    <LinearLayout
      android:id="@+id/media_controls_container"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:orientation="horizontal">

      <ImageView
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:scaleX="0"
        android:scaleY="0"
        android:src="@mipmap/play" />

      <ImageView
        android:id="@+id/iv_pause_play"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:scaleX="0"
        android:scaleY="0"
        android:src="@mipmap/play" />

      <ImageView
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_marginRight="50dp"
        android:scaleX="0"
        android:scaleY="0"
        android:src="@mipmap/play" />

    </LinearLayout>

    <ImageButton
      android:id="@+id/fab"
      android:layout_width="56dp"
      android:layout_height="56dp"
      android:layout_gravity="top|right"
      android:layout_marginRight="72dp"
      android:background="@drawable/ripple"
      android:elevation="5dp"
      android:onClick="onPabPressed"
      android:transitionName="button_fab" />
  </FrameLayout>

</RelativeLayout>

4、获取控件，并且设置点击事件，设置一些动画常量

private View mFab;
  private FrameLayout mFabcontainer;
  private LinearLayout mControlsContainer;

  //从什么时候开始执行动画
  private static final float SCALE_FACTOR = 13f;
  //持续时间
  private static final long ANIMATION_DURATION = 300;
  //贝塞尔曲线滑动到什么时候开始执行动画
  private static final float MINIMUN_X_DISTANCE = 200;
  private boolean mRevealFlag;
  private float mFabSize;

5、给mFab设置点击事件

private void onFabPressed(View view) {
    final float startX = mFab.getX();
    //开始动画
    AnimatorPath path = new AnimatorPath();
    path.moveTo(0, 0);
    path.curveTo(-200, 200, -400, 100, -600, 50);
//    path.lineTo(-600,50);

    ObjectAnimator anim = ObjectAnimator.ofObject(this, "fabLoc",
        new PathEvaluator(), path.getPoints().toArray());
    anim.setInterpolator(new AccelerateInterpolator());
//    anim.setRepeatCount(ValueAnimator.INFINITE);
//    anim.setRepeatMode(ValueAnimator.REVERSE);
    anim.setDuration(ANIMATION_DURATION);
    anim.start();
    anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator valueAnimator) {
        //到了path路径中的某个位置就是开始扩散动画
        if (Math.abs(startX - mFab.getX()) > MINIMUN_X_DISTANCE) {
          if (!mRevealFlag) {
            ImageButton fab = (ImageButton) mFab;
            fab.setImageDrawable(new BitmapDrawable());
            //看布局里边的FabContainer要比toolbar背景高mFabSize/2(为了最初的半个fab效果)
            mFabcontainer.setY(mFabcontainer.getY() + mFabSize / 2);
            //fab放大动画
            mFab.animate()
                .scaleXBy(SCALE_FACTOR)
                .scaleYBy(SCALE_FACTOR)
                .setListener(mEndRevealListener)
                .setDuration(ANIMATION_DURATION);
            mRevealFlag = true;
          }
        }
      }
    });
  }

  public void setFabLoc(PathPoint newLoc) {
    mFab.setTranslationX(newLoc.mX);
    if (mRevealFlag) {
      //因为布局里边的mFabcontainer要比toolbar背景高mFabSize/2，所以fab为了看起来平顺，需要上移mFabSize/2
      mFab.setTranslationY(newLoc.mY - (mFabSize / 2));
    } else {
      mFab.setTranslationY(newLoc.mY);
    }

  }

  private AnimatorListenerAdapter mEndRevealListener = new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
      super.onAnimationEnd(animation);
      mFab.setVisibility(View.INVISIBLE);
      mFabcontainer.setBackgroundColor(getResources().getColor(R.color.colorAccent));
      //reveal动画完毕后，接着每一个子控件都有个缩放动画（依次顺序出来）
      for (int i = 0; i < mControlsContainer.getChildCount(); i++) {
        View v = mControlsContainer.getChildAt(i);
        ViewPropertyAnimator animate = v.animate()
            .scaleX(1)
            .scaleY(1)
            .setDuration(ANIMATION_DURATION);
        animate.setStartDelay(i * 50);
        animate.start();
      }
    }
  };

PathEvaluator

public class PathEvaluator implements TypeEvaluator<PathPoint> {
  @Override
  public PathPoint evaluate(float t, PathPoint startValue, PathPoint endValue) {
    //t执行的百分比 (0~1)
    float x, y;
    if (endValue.mOperation == PathPoint.CURVE) {
      //三阶贝塞尔曲线 公式
      float oneMinusT = 1 - t;
      x = oneMinusT * oneMinusT * oneMinusT * startValue.mX +
          3 * oneMinusT * oneMinusT * t * endValue.mControl0X +
          3 * oneMinusT * t * t * endValue.mControl1X +
          t * t * t * endValue.mX;
      y = oneMinusT * oneMinusT * oneMinusT * startValue.mY +
          3 * oneMinusT * oneMinusT * t * endValue.mControl0Y +
          3 * oneMinusT * t * t * endValue.mControl1X +
          t * t * t * endValue.mY;
    } else if (endValue.mOperation == PathPoint.LINE) {
      //x=起始点+t*起始点和终点的距离
      x = startValue.mX + t * (endValue.mX - startValue.mX);
      y = startValue.mY + t * (endValue.mY - startValue.mY);
    } else {
      x = endValue.mX;
      y = endValue.mY;

    }
    return PathPoint.moveTo(x, y);
  }
}

注意：属性动画既可以改变属性，也可以改变一个变量或者方法

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