Material Design - Curved motion

在 5.0 上提供了很多动画效果方面的优化和设置
在android5.0(api21)及以上，允许自定义这些动画：
1. Touch feedback 触摸反馈
2. Circular Reveal 圆形显示
3. Activity transitions 过渡动画
4. Curved motion 曲线运动
5. View state changes 视图状态变化

4. Curved motion 曲线运动

Material design中的动画依靠曲线，这个曲线适用于时间插值器和控件运动模式。

PathInterpolator类是一个基于贝塞尔曲线(Bézier curve)或路径(Path)对象上的新的插值器。这个插值器指定了一个1x1的方形运动曲线，用(0,0)点和(1,1)定位点还有控制点来作为构造方法中的参数。你还可以定义一个XML资源的路径插值器：

<pathInterpolator xmlns:android="http://schemas.android.com/apk/res/android"android:controlX1="0.4"android:controlY1="0"android:controlX2="1"android:controlY2="1"/>

在materialdesign规范中，系统提供了三个基本的曲线：

@interpolator/fast_out_linear_in.xml
@interpolator/fast_out_slow_in.xml
@interpolator/linear_out_slow_in.xml

你可以传递一个PathInterpolator对象给Animator.setInterpolator()方法。。

ObjectAnimator类有的构造方法，使你能够一次能同时使用两个或多个属性去绘制动画的路径。
例如，下面的动画使用一个Path对象进行视图X和Y属性的动画绘制：

ObjectAnimator mAnimator;
mAnimator = ObjectAnimator.ofFloat(view, View.X, View.Y, path);
…
mAnimator.start();

     ObjectAnimator.ofArgbObjectAnimator.ofFloatObjectAnimator.ofIntObjectAnimator.ofMultiFloatObjectAnimator.ofObjectObjectAnimator.ofPropertyValuesHolder

4.2相关代码示例可以参考：

android-sdk-windows\samples\android-21\legacy\ApiDemos\src\com\example\android\apis\animation\PathAnimations.java

PathAnimation.java

/** This application demonstrates the use of Path animation. */
public class PathAnimations extends Activity implements  RadioGroup.OnCheckedChangeListener, View.OnLayoutChangeListener {  final static Path sTraversalPath = new Path();  final static float TRAVERSE_PATH_SIZE = 7.0f;  final static Property<PathAnimations, Point> POINT_PROPERTY  = new Property<PathAnimations, Point>(Point.class, "point") {  @Override  public Point get(PathAnimations object) {  View v = object.findViewById(R.id.moved_item);  return new Point(Math.round(v.getX()), Math.round(v.getY()));  }  @Override  public void set(PathAnimations object, Point value) {  object.setCoordinates(value.x, value.y);  }  };  static {  float inverse_sqrt8 = FloatMath.sqrt(0.125f);  RectF bounds = new RectF(1, 1, 3, 3);  sTraversalPath.addArc(bounds, 45, 180);  sTraversalPath.addArc(bounds, 225, 180);  bounds.set(1.5f + inverse_sqrt8, 1.5f + inverse_sqrt8, 2.5f + inverse_sqrt8,  2.5f + inverse_sqrt8);  sTraversalPath.addArc(bounds, 45, 180);  sTraversalPath.addArc(bounds, 225, 180);  bounds.set(4, 1, 6, 3);  sTraversalPath.addArc(bounds, 135, -180);  sTraversalPath.addArc(bounds, -45, -180);  bounds.set(4.5f - inverse_sqrt8, 1.5f + inverse_sqrt8, 5.5f - inverse_sqrt8, 2.5f + inverse_sqrt8);  sTraversalPath.addArc(bounds, 135, -180);  sTraversalPath.addArc(bounds, -45, -180);  sTraversalPath.addCircle(3.5f, 3.5f, 0.5f, Path.Direction.CCW);  sTraversalPath.addArc(new RectF(1, 2, 6, 6), 0, 180);  }  private CanvasView mCanvasView;  private ObjectAnimator mAnimator;  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.path_animations);  mCanvasView = (CanvasView) findViewById(R.id.canvas);  mCanvasView.addOnLayoutChangeListener(this);  ((RadioGroup) findViewById(R.id.path_animation_type)).setOnCheckedChangeListener(this);  }  public void setCoordinates(int x, int y) {  changeCoordinates((float) x, (float) y);  }  public void changeCoordinates(float x, float y) {  View v = findViewById(R.id.moved_item);  v.setX(x);  v.setY(y);  }  public void setPoint(PointF point) {  changeCoordinates(point.x, point.y);  }  @Override  public void onCheckedChanged(RadioGroup group, int checkedId) {  startAnimator(checkedId);  }  @Override  public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,  int oldTop, int oldRight, int oldBottom) {  int checkedId = ((RadioGroup)findViewById(R.id.path_animation_type)).getCheckedRadioButtonId();  if (checkedId != RadioGroup.NO_ID) {  startAnimator(checkedId);  }  }  private void startAnimator(int checkedId) {  if (mAnimator != null) {  mAnimator.cancel();  mAnimator = null;  }  View view = findViewById(R.id.moved_item);  Path path = mCanvasView.getPath();  if (path.isEmpty()) {  return;  }  switch (checkedId) {  case R.id.named_components:  // Use the named "x" and "y" properties for individual (x, y)  // coordinates of the Path and set them on the view object.  // The setX(float) and setY(float) methods are called on view.  // An int version of this method also exists for animating  // int Properties.  mAnimator = ObjectAnimator.ofFloat(view, "x", "y", path);  break;  case R.id.property_components:  // Use two Properties for individual (x, y) coordinates of the Path  // and set them on the view object.  // An int version of this method also exists for animating  // int Properties.  mAnimator = ObjectAnimator.ofFloat(view, View.X, View.Y, path);  break;  case R.id.multi_int:  // Use a multi-int setter to animate along a Path. The method  // setCoordinates(int x, int y) is called on this during the animation.  // Either "setCoordinates" or "coordinates" are acceptable parameters  // because the "set" can be implied.  mAnimator = ObjectAnimator.ofMultiInt(this, "setCoordinates", path);  break;  case R.id.multi_float:  // Use a multi-float setter to animate along a Path. The method  // changeCoordinates(float x, float y) is called on this during the animation.  mAnimator = ObjectAnimator.ofMultiFloat(this, "changeCoordinates", path);  break;  case R.id.named_setter:  // Use the named "point" property to animate along the Path.  // There must be a method setPoint(PointF) on the animated object.  // Because setPoint takes a PointF parameter, no TypeConverter is necessary.  // In this case, the animated object is PathAnimations.  mAnimator = ObjectAnimator.ofObject(this, "point", null, path);  break;  case R.id.property_setter:  // Use the POINT_PROPERTY property to animate along the Path.  // POINT_PROPERTY takes a Point, not a PointF, so the TypeConverter  // PointFToPointConverter is necessary.  mAnimator = ObjectAnimator.ofObject(this, POINT_PROPERTY,  new PointFToPointConverter(), path);  break;  }  mAnimator.setDuration(10000);  mAnimator.setRepeatMode(Animation.RESTART);  mAnimator.setRepeatCount(ValueAnimator.INFINITE);  mAnimator.setInterpolator(new LinearInterpolator());  mAnimator.start();  }  public static class CanvasView extends FrameLayout {  Path mPath = new Path();  Paint mPathPaint = new Paint();  public CanvasView(Context context) {  super(context);  init();  }  public CanvasView(Context context, AttributeSet attrs) {  super(context, attrs);  init();  }  public CanvasView(Context context, AttributeSet attrs, int defStyle) {  super(context, attrs, defStyle);  init();  }  private void init() {  setWillNotDraw(false);  mPathPaint.setColor(0xFFFF0000);  mPathPaint.setStrokeWidth(2.0f);  mPathPaint.setStyle(Paint.Style.STROKE);  }  @Override  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {  super.onLayout(changed, left, top, right, bottom);  if (changed) {  Matrix scale = new Matrix();  float scaleWidth = (right-left)/TRAVERSE_PATH_SIZE;  float scaleHeight= (bottom-top)/TRAVERSE_PATH_SIZE;  scale.setScale(scaleWidth, scaleHeight);  sTraversalPath.transform(scale, mPath);  }  }  public Path getPath() {  return mPath;  }  @Override  public void draw(Canvas canvas) {  canvas.drawPath(mPath, mPathPaint);  super.draw(canvas);  }  }  private static class PointFToPointConverter extends TypeConverter<PointF, Point> {  Point mPoint = new Point();  public PointFToPointConverter() {  super(PointF.class, Point.class);  }  @Override  public Point convert(PointF value) {  mPoint.set(Math.round(value.x), Math.round(value.y));  return mPoint;  }  }
}

path_animations.xml

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent">  <ScrollView android:layout_width="match_parent"  android:layout_height="wrap_content">  <RadioGroup android:orientation="horizontal"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:id="@+id/path_animation_type"  >  <RadioButton android:id="@+id/named_components"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="Named Components"/>  <RadioButton android:id="@+id/property_components"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="Property Components"/>  <RadioButton android:id="@+id/multi_int"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="Multi-int"/>  <RadioButton android:id="@+id/multi_float"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="Multi-float"/>  <RadioButton android:id="@+id/named_setter"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="Named Property"/>  <RadioButton android:id="@+id/property_setter"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="Property"/>  </RadioGroup>  </ScrollView>  <view class="com.example.android.apis.animation.PathAnimations$CanvasView"  android:id="@+id/canvas"  android:layout_width="match_parent"  android:layout_height="0px"  android:layout_weight="1">  <ImageView android:id="@+id/moved_item"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:src="@drawable/frog"/>  </view>
</LinearLayout>

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