【Android 开发】使用不同的 interpolator、色彩渐变

singlefragmentactivity.java

package com.example.aster.draganddraw;

import android.os.bundle;
import android.support.annotation.layoutres;
import android.support.v4.app.fragment;
import android.support.v4.app.fragmentmanager;
import android.support.v7.app.appcompatactivity;

public abstract class singlefragmentactivity extends appcompatactivity {

 protected abstract fragment createfragment();

 @layoutres
 protected int getlayoutresid() {
  return r.layout.activity_fragment;
 }

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(getlayoutresid());

  fragmentmanager fm = getsupportfragmentmanager();
  fragment fragment = fm.findfragmentbyid(r.id.fragment_container);

  if (fragment == null) {
fragment = createfragment();
fm.begintransaction().add(r.id.fragment_container, fragment).commit();
  }
 }
}

sunsetactivity.java

package com.example.aster.sunset;

import android.support.v4.app.fragment;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;

public class sunsetactivity extends singlefragmentactivity {

 @override
 protected fragment createfragment() {
  return sunsetfragment.newinstance();
 }
}

sunsetfragment.java

package com.example.aster.sunset;

import android.animation.argbevaluator;
import android.animation.objectanimator;
import android.content.res.resources;
import android.os.bundle;
import android.support.v4.app.fragment;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.view.animation.accelerateinterpolator;

public class sunsetfragment extends fragment {

 private view msceneview;
 private view msunview;
 private view mskyview;

 private int mblueskycolor;
 private int msunsetskycolor;
 private int mnightskycolor;

 public static sunsetfragment newinstance() {
  return new sunsetfragment();
 }

 @override
 public view oncreateview(layoutinflater inflater, viewgroup container,
  bundle savedinstancestate) {
  view view = inflater.inflate(r.layout.fragment_sunset, container, false);

  msceneview = view;
  msunview = view.findviewbyid(r.id.sun);
  mskyview = view.findviewbyid(r.id.sky);

  resources resources = getresources();
  mblueskycolor = resources.getcolor(r.color.blue_sky);
  msunsetskycolor = resources.getcolor(r.color.sunset_sky);
  mnightskycolor = resources.getcolor(r.color.night_sky);

  msceneview.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view v) {
 startanimation();
}
  });

  return view;
 }

 private void startanimation() {
  float sunystart = msunview.gettop();
  float sunyend = mskyview.getheight();

  objectanimator heightanimator = objectanimator
 .offloat(msunview, "y", sunystart, sunyend)
 .setduration(3000);
  heightanimator.setinterpolator(new accelerateinterpolator());

  objectanimator sunsetskyanimator = objectanimator
 .ofint(mskyview, "backgroundcolor", mblueskycolor, msunsetskycolor)
 .setduration(3000);
  sunsetskyanimator.setevaluator(new argbevaluator());

  heightanimator.start();
  sunsetskyanimator.start();
 }
}

res/drawable/sun.xml

activity_fragment.xml

<framelayout android:id="@+id/fragment_container" android:layout_height="match_parent" android:layout_width="match_parent" xmlns:android="https://schemas.android.com/apk/res/android"></framelayout>

fragment_sunset.xml

 <framelayout android:background="@color/blue_sky" android:id="@+id/sky" android:layout_height="0dp" android:layout_weight="0.61" android:layout_width="match_parent">
  
 </framelayout>

 

res/values/colors.xml

 #3f51b5
 #303f9f
 #ff4081

 #fcfcb7
 #1e7ac7
 #ec8100
 #05192e
 #224869