谁说Android的动画不廉价(三)之共享元素动画
本系列文章一共5篇
谁说Android的动画不廉价(一)之项目分层
谁说Android的动画不廉价(二)之转场动画
谁说Android的动画不廉价(三)之共享元素动画
谁说Android的动画不廉价(四)之元素动画
谁说Android的动画不廉价(五)之水波纹动画
GitHub源码
引言
本篇博文是基于上一篇博文谁说Android的动画不廉价(二)之转场动画的基础上做的拓展。
目标效果图
转场动画前提说明
上篇回顾
还记得上一篇提到过的startActivity(Intent intent,Bundle bundle);
吧?我们把转场的动画参数通过ActivityOptionsCompat
导出,然后通过Intent
去传递。同样Android的共享动画也是在这里做手脚
相关知识
transitionName
还记得我们上篇博文中MainActivity
的布局中设置过这个参数吗?
共享元素动画标识哪两个元素需要联系到一起,就是通过transitionName
参数。不过还需要一个Pair
的类支持
Pair
Pair
类把View
和对应的transitionName
联系在一起,所以上面的那个布局文件,未必需要添加transitionName
属性,不过因为方便和标准。我们一般这么做。
改参数用于ActivityOptionsCompat.makeSceneTransitionAnimation(Activity activity,@Nullable Pair[] pairList);
可指定多个
着手编码
先把三个布局文件写出来
activity_share_elements.xml
ShareElementsActivity<?xml version="1.0" encoding="utf-8"?>
fragment_share_elements1.xml
ShareElementFragment1<?xml version="1.0" encoding="utf-8"?>
fragment_share_elements2.xml
ShareElementFragment2<?xml version="1.0" encoding="utf-8"?>
代码
MainActivity.java
public void shareElements(View v) { ImageView imageView = (ImageView) findViewById(R.id.img); Intent intent = new Intent(this, ShareElementsActivity.class); ActivityOptionsCompat activityOptionsCompat = ActivityOptionsCompat.makeSceneTransitionAnimation(this, new Pair(imageView, imageView.getTransitionName())); startActivity(intent, activityOptionsCompat.toBundle()); }
直接指定new Pair
即可
ShareElementsFragment1.java
package demo.august1996.top.transitionanimationsdemo.Fragment;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.transition.ChangeBounds;import android.transition.Slide;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import demo.august1996.top.transitionanimationsdemo.R;/** * Created by August on 16/9/8. */public class ShareElementsFragment1 extends Fragment { View view; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_share_elements1, container, false); view.findViewById(R.id.next).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { replaceFragment(false); } }); view.findViewById(R.id.nextWithOverlap).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { replaceFragment(true); } }); this.view = view.findViewById(R.id.img); return view; } private void replaceFragment(boolean isOverlap) { Fragment fragment = new ShareElementsFragment2(); Slide slide = new Slide(); slide.setDuration(1000); slide.setSlideEdge(Gravity.LEFT); fragment.setAllowEnterTransitionOverlap(isOverlap); fragment.setAllowReturnTransitionOverlap(isOverlap); fragment.setEnterTransition(slide); ChangeBounds changeBounds = new ChangeBounds(); changeBounds.setDuration(1000); fragment.setSharedElementEnterTransition(changeBounds); getActivity() .getSupportFragmentManager() .beginTransaction() .replace(R.id.container, fragment) .addToBackStack(null) .addSharedElement(view, view.getTransitionName()) .commit(); }}
FragmentTransaction.addSharedElement(View view,String transitionName);
可以为Fragment添加共享元素。Fragment.setXXXTransition(Transition transition);
可以为Fragment添加向Activity一样的转场效果当Overlap的属性为真的时候,下一个页面的EnterTransition会马上开始。当为假的时候,下一个页面的EnterTransition要等上一个页面的ExitTransition完了之后才开始。
ShareElementsFragment2.java
package demo.august1996.top.transitionanimationsdemo.Fragment;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import demo.august1996.top.transitionanimationsdemo.R;/** * Created by August on 16/9/8. */public class ShareElementsFragment2 extends Fragment{ @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_share_elements2,container,false); return view; }}
ShareElementsActivity.java
package demo.august1996.top.transitionanimationsdemo;import android.support.v4.app.Fragment;import android.transition.Slide;import demo.august1996.top.transitionanimationsdemo.Activity.ToolbarActivity;import demo.august1996.top.transitionanimationsdemo.Fragment.ShareElementsFragment1;public class ShareElementsActivity extends ToolbarActivity { @Override protected String getToolbarTitle() { return "共享元素动画"; } @Override protected void initView() { Fragment fragment = new ShareElementsFragment1(); Slide slide = new Slide(); slide.setDuration(1000); fragment.setExitTransition(slide); getSupportFragmentManager() .beginTransaction() .replace(R.id.container, fragment) .commit(); } @Override protected int getContentViewID() { return R.layout.activity_share_elements; } @Override protected boolean canBack() { return true; }}
我们的效果图
我们的效果图总结
其实别看文章这么长,关键的东西其实没有多少。AS自动生成的代码到不少。。。。
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