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使用 SharedElement 动画切换 Fragment 页面

Android的动画效果, Material Design提出的. 当Fragment切换时, 一些元素(Element)会保持不变, 形成连续动画. 目前只支持Api21+.

在这些元素切换时, 页面需要设置addSharedElement()方法. 让我们来看一下如何实现吧.

本文源码的GitHub 下载地址

使用 SharedElement 动画切换 Fragment 页面

配置

还是从一个HelloWorld工程开始.

build.gradle 添加两个常用库, recyclerview和butterknife.

compile 'com.jakewharton:butterknife:7.0.1'
compile 'com.android.support:recyclerview-v7:23.1.0'

修改主题颜色

<color name="colorPrimary">#FF1493</color>
<color name="colorPrimaryDark">#FF1493</color>

去掉 状态条(status bar) 的透明颜色, 在style中, 删除statusBarColor.

<item name="android:statusBarColor">@android:color/transparent</item>

主页

在Activity中添加Fragment, 内容在Fragment中添加

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// 替换Fragment
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.main_cl_container, new GridFragment())
.commit();
}
}

Fragment中使用RecyclerView创建一个网格(Grid)页面, 为Item添加点击监听, 这个下一步再完成. Item显示一个图片和一行文字.

public class GridFragment extends Fragment {

private ArrayList<Pair<Integer, Integer>> mData;

@Bind(R.id.grid_rv_recycler)
RecyclerView mRvRecycler;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{

View view = inflater.inflate(R.layout.fragment_grid, container, false);
ButterKnife.bind(this, view);
return view;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);

initData();

mRvRecycler.setAdapter(new MyGridAdapter(mData, mListener));
mRvRecycler.setLayoutManager(new GridLayoutManager(getContext(), 2)); // 一行两个
}

private MyViewOnClickListener mListener = new MyViewOnClickListener() {
@Override
public void onClickedView(MyGridViewHolder holder, int position) {

}
};

// 初始化数据
private void initData() {
mData = new ArrayList<>();

mData.add(Pair.create(R.string.taeyeon, R.drawable.taeyeon));
mData.add(Pair.create(R.string.jessica, R.drawable.jessica));
mData.add(Pair.create(R.string.sunny, R.drawable.sunny));
mData.add(Pair.create(R.string.tiffany, R.drawable.tiffany));
mData.add(Pair.create(R.string.yuri, R.drawable.yuri));
mData.add(Pair.create(R.string.yoona, R.drawable.yoona));
}

@Override
public void onDestroyView() {
super.onDestroyView();
ButterKnife.unbind(this);
}
}

RecyclerView的Adapter

/**
* Fragment的网格适配器
* <p/>
* Created by wangchenlong on 15/11/5.
*/

public class MyGridAdapter extends RecyclerView.Adapter<MyGridViewHolder> {

private ArrayList<Pair<Integer, Integer>> mData; // 名字和图片
private MyViewOnClickListener mListener; // 点击事件

public MyGridAdapter(ArrayList<Pair<Integer, Integer>> data,
MyViewOnClickListener listener)
{

mData = data;
mListener = listener;
}

@Override
public MyGridViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_item, parent, false);
return new MyGridViewHolder(view);
}

@Override
public void onBindViewHolder(final MyGridViewHolder holder, final int position) {
holder.getTextView().setText(mData.get(position).first);
holder.getImageView().setImageResource(mData.get(position).second);

// 把每个图片视图设置不同的Transition名称, 防止在一个视图内有多个相同的名称, 在变换的时候造成混乱
// Fragment支持多个View进行变换, 使用适配器时, 需要加以区分
ViewCompat.setTransitionName(holder.getImageView(), String.valueOf(position) + "_image");

holder.getImageView().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mListener.onClickedView(holder, position);
}
});
}

@Override
public int getItemCount() {
return mData.size();
}
}

注意 ViewCompat.setTransitionName(); , 把不同的视图设置不同的变换名称, 防止造成混乱, 同时支持多个视图同时变换.

ViewHolder

/**
* 提供了Grid的ImageView
* <p/>
* Created by wangchenlong on 15/11/5.
*/

public class MyGridViewHolder extends RecyclerView.ViewHolder {

private ImageView mImageView;
private TextView mTextView;

public MyGridViewHolder(View itemView) {
super(itemView);
mImageView = (ImageView) itemView.findViewById(R.id.grid_image);
mTextView = (TextView) itemView.findViewById(R.id.grid_text);
}

public ImageView getImageView() {
return mImageView;
}

public TextView getTextView() {
return mTextView;
}
}

点击接口, 提供ViewHolder和点击的位置position.

public interface MyViewOnClickListener {
void onClickedView(MyGridViewHolder holder, int position);
}

效果

使用 SharedElement 动画切换 Fragment 页面

详情

主页面跳转之后的详情页面, 根据选择的ID, 创建不同内容的Fragment, 点击图片返回上一个Fragment, 和主页面联动执行动画, 动画逻辑在主页面的FragmentManager中添加的.

/**
* 详情页面
* <p/>
* Created by wangchenlong on 15/11/5.
*/

public class DetailFragment extends Fragment {

private static final String ARG_NUMBER = "arg_number";
private ArrayList<DetailData> mDetailDatas;

@Bind(R.id.detail_image)
ImageView mImage;

@Bind(R.id.detail_head)
TextView mHead;

@Bind(R.id.detail_body)
TextView mBody;

/**
* 根据选择的number, 选择展示的数据
*
* @param number 数字
* @return 详情页面
*/

public static DetailFragment newInstance(@IntRange(from = 0, to = 5) int number) {
Bundle bundle = new Bundle();
bundle.putInt(ARG_NUMBER, number);

DetailFragment detailFragment = new DetailFragment();
detailFragment.setArguments(bundle);

return detailFragment;
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_detail, container, false);
ButterKnife.bind(this, view);
return view;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);

initData();

int number = getArguments().getInt(ARG_NUMBER);
mImage.setImageResource(mDetailDatas.get(number).getImage());
mHead.setText(mDetailDatas.get(number).getHead());
mBody.setText(mDetailDatas.get(number).getBody());

mImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getActivity().getSupportFragmentManager().popBackStack();
}
});
}



// 初始化数据
private void initData() {
mDetailDatas = new ArrayList<>();
mDetailDatas.add(new DetailData(R.drawable.taeyeon, R.string.taeyeon, R.string.taeyeon_detail));
mDetailDatas.add(new DetailData(R.drawable.jessica, R.string.jessica, R.string.jessica_detail));
mDetailDatas.add(new DetailData(R.drawable.sunny, R.string.sunny, R.string.sunny_detail));
mDetailDatas.add(new DetailData(R.drawable.tiffany, R.string.tiffany, R.string.tiffany_detail));
mDetailDatas.add(new DetailData(R.drawable.yuri, R.string.yuri, R.string.yuri_detail));
mDetailDatas.add(new DetailData(R.drawable.yoona, R.string.yoona, R.string.yoona_detail));
}

@Override
public void onDestroyView() {
super.onDestroyView();
ButterKnife.unbind(this);
}

// 定义类
private class DetailData {
private int mImage;
private int mHead;
private int mBody;

public DetailData(int image, int head, int body) {
mImage = image;
mHead = head;
mBody = body;
}

public int getImage() {
return mImage;
}

public int getHead() {
return mHead;
}

public int getBody() {
return mBody;
}
}
}

关键的资源文件, 有一条重要的属性, android:transitionName="" 表明需要转换对象的名称, 在点击事件中使用.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:padding="16dp">


<ImageView
android:id="@+id/detail_image"
android:layout_width="240dp"
android:layout_height="240dp"
android:scaleType="centerCrop"
android:src="@drawable/tiffany"
android:transitionName="@string/image_transition"
tools:ignore="UnusedAttribute"/>


<TextView
android:id="@+id/detail_head"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tiffany"
android:textAppearance="@style/TextAppearance.AppCompat.Headline"/>


<TextView
android:id="@+id/detail_body"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tiffany_detail"
android:textAppearance="@style/TextAppearance.AppCompat.Body2"/>


</LinearLayout>

效果

使用 SharedElement 动画切换 Fragment 页面

重写 GridFragment 的点击事件

/**
* 点击事件, 转换元素的动画,
* 关键addSharedElement(holder.getImageView(), getResources().getString(R.string.image_transition))
* 绑定ViewHolder的图片和DetailFragment的跳转.
*/

private MyViewOnClickListener mListener = new MyViewOnClickListener() {
@Override
public void onClickedView(MyGridViewHolder holder, int position) {
DetailFragment detailFragment = DetailFragment.newInstance(position);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
detailFragment.setSharedElementEnterTransition(new DetailTransition());
setExitTransition(new Fade());
detailFragment.setEnterTransition(new Fade());
detailFragment.setSharedElementReturnTransition(new DetailTransition());
}

getActivity().getSupportFragmentManager().beginTransaction()
.addSharedElement(holder.getImageView(), getResources().getString(R.string.image_transition))
.replace(R.id.main_cl_container, detailFragment)
.addToBackStack(null)
.commit();
}
};

关键addSharedElement(), 确定转换的元素View.Fade是淡出动画; DetailTransition是自定义动画.

填写动画属性

/**
* 转换动画
* Created by wangchenlong on 15/11/5.
*/

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public class DetailTransition extends TransitionSet {
public DetailTransition() {
init();
}

// 允许资源文件使用
public DetailTransition(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

private void init() {
setOrdering(ORDERING_TOGETHER);
addTransition(new ChangeBounds()).
addTransition(new ChangeTransform()).
addTransition(new ChangeImageTransform());
}
}

动画效果, 添加属性即可.

ChangeBounds: 视图的位置和大小;

ChangeTransform: 视图的比例(scale);

ChangeImageTransform: 图像的比例;

已经都完成了, 当切换Fragment时, 关联视图就会使用动画进行播放!OK, that’s all! Enjoy it.

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使用 SharedElement 动画切换 Fragment 页面

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