copy AnimatorSet and related classes from AOSP

This makes AnimatedVectorDrawableCompat from androidx functional and
probably also helps other animation stuff.

src/api-impl/android/animation/ArgbEvaluator.java

@@ -1,5 +1,9 @@
 package android.animation;
 
-public class ArgbEvaluator {
+public class ArgbEvaluator implements TypeEvaluator {
+
+	public static ArgbEvaluator getInstance() {
+		return null;
+	}
 
 }

src/api-impl/android/animation/PropertyValuesHolder.java

@@ -1,11 +1,141 @@
 package android.animation;
 
-public class PropertyValuesHolder{
+import java.lang.reflect.Method;
+import android.util.Log;
+import android.util.Property;
+
+public class PropertyValuesHolder {
+
+	private float values_float[];
+	private int values_int[];
+	private Object values_object[];
+	private Object value;
+	private String property_name;
+	private Method setter;
+
 	public static PropertyValuesHolder ofFloat(String propertyName, float... values) {
-		return null;
+		PropertyValuesHolder propertyValuesHolder = new PropertyValuesHolder();
+		propertyValuesHolder.values_float = values;
+		propertyValuesHolder.property_name = propertyName;
+		return propertyValuesHolder;
 	}
 
 	public static PropertyValuesHolder ofObject(String propertyName, TypeEvaluator evaluator, Object... values) {
+		PropertyValuesHolder propertyValuesHolder = new PropertyValuesHolder();
+		propertyValuesHolder.values_object = values;
+		propertyValuesHolder.property_name = propertyName;
+		return propertyValuesHolder;
+	}
+
+	public static PropertyValuesHolder ofInt(String propertyName, int... values) {
+		PropertyValuesHolder propertyValuesHolder = new PropertyValuesHolder();
+		propertyValuesHolder.values_int = values;
+		propertyValuesHolder.property_name = propertyName;
+		return propertyValuesHolder;
+	}
+
+	public static PropertyValuesHolder ofFloat(Property property, float... values) {
+		PropertyValuesHolder propertyValuesHolder = new PropertyValuesHolder();
+		propertyValuesHolder.values_float = values;
+		propertyValuesHolder.property_name = property.getName();
+		return propertyValuesHolder;
+	}
+
+	public static PropertyValuesHolder ofObject(Property property, TypeEvaluator evaluator, Object... values) {
+		PropertyValuesHolder propertyValuesHolder = new PropertyValuesHolder();
+		propertyValuesHolder.values_object = values;
+		propertyValuesHolder.property_name = property.getName();
+		return propertyValuesHolder;
+	}
+
+	public static PropertyValuesHolder ofInt(Property property, int... values) {
+		PropertyValuesHolder propertyValuesHolder = new PropertyValuesHolder();
+		propertyValuesHolder.values_int = values;
+		propertyValuesHolder.property_name = property.getName();
+		return propertyValuesHolder;
+	}
+
+	public void setIntValues(int... values) {
+		values_int = values;
+	}
+
+	public void setFloatValues(float... values) {
+		values_float = values;
+	}
+
+	public void setObjectValues(Object... values) {
+		values_object = values;
+	}
+
+	public String getProperty_name() {
+		return property_name;
+	}
+
+	public void setProperty_name(String propertyName) {
+		this.property_name = propertyName;
+	}
+
+	public void setProperty(Property property) {
+		property_name = property.getName();
+	}
+
+	public void init() {}
+
+	public Object getAnimatedValue() {
+		return value;
+	}
+
+	public void setEvaluator(TypeEvaluator value) {}
+
+	public void calculateValue(float fraction) {
+		if (values_object != null) {
+			value = values_object[(int) (fraction * (values_object.length - 1) + 0.5f)];
+		} else if (values_float != null) {
+			int i = (int) (fraction * (values_float.length - 1));
+			float f = fraction * (values_float.length - 1) - i;
+			value = values_float[i] * (1 - f) + ((f!=0.f) ? values_float[i + 1] * f : 0.f);
+		} else if (values_int != null) {
+			int i = (int) (fraction * (values_int.length - 1));
+			float f = fraction * (values_int.length - 1) - i;
+			value = (int)(values_int[i] * (1 - f) + ((f!=0.f) ? values_int[i + 1] * f : 0.f) + 0.5f);
+		} else {
+			Log.e("PropertyValuesHolder", "No values set");
+		}
+	}
+
+	public PropertyValuesHolder clone() {
 		return null;
 	}
+
+	public void setupSetterAndGetter(Object target) {
+		try {
+			Class<?> clazz;
+			if (values_float != null) {
+				clazz = float.class;
+			} else {
+				clazz = values_object[0].getClass();
+			}
+			setter = target.getClass().getMethod("set" + property_name.substring(0, 1).toUpperCase() + property_name.substring(1), clazz);
+		} catch (NoSuchMethodException e) {
+			Log.e("PropertyValuesHolder", "failed to find setter", e);
+		}
+	}
+
+	public void setupStartValue(Object target) {
+	}
+
+	public void setupEndValue(Object target) {
+	}
+
+	public void setAnimatedValue(Object target) {
+		if (setter != null && value != null) {
+			try {
+				setter.invoke(target, value);
+			} catch (ReflectiveOperationException e) {
+				Log.e("PropertyValuesHolder", "failed to invoke setter", e);
+			}
+		} else {
+			Log.e("PropertyValuesHolder", "no setter or value set");
+		}
+	}
 }