Java 使用交错布局预加载毕加索图像

我有一个StaggedGridLayoutManager，可以在2列宽的网格中加载20张包含图像的卡（从缓存、网络或毕加索的存储中加载）

问题：

    // Setup RecyclerView
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.gridview_posts);
    mRecyclerView.setHasFixedSize(true);

    // Setup StaggeredGridLayoutManager
    mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
    mRecyclerView.setLayoutManager(mLayoutManager);

    // Set Adapter
    mPostsAdapter = new PostAdapter(rootView.getContext(), posts);
    mRecyclerView.setAdapter(mPostsAdapter);

    // Start RestClient & get posts
    restClient = new RestClient(getString(R.string.api_location));
    getPosts();

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="2dp"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ImageView
        android:id="@+id/id_imgItem"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"/>
    <TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/id_imgItem"
        android:paddingTop="4dp"
        android:paddingBottom="4dp"
        android:gravity="center_horizontal"
        android:textSize="18sp"/>

</RelativeLayout>

当前，当您向下滚动列表时，图像会随着卡滑入视图而加载，如下图所示：

所需解决方案：

    // Setup RecyclerView
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.gridview_posts);
    mRecyclerView.setHasFixedSize(true);

    // Setup StaggeredGridLayoutManager
    mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
    mRecyclerView.setLayoutManager(mLayoutManager);

    // Set Adapter
    mPostsAdapter = new PostAdapter(rootView.getContext(), posts);
    mRecyclerView.setAdapter(mPostsAdapter);

    // Start RestClient & get posts
    restClient = new RestClient(getString(R.string.api_location));
    getPosts();

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="2dp"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ImageView
        android:id="@+id/id_imgItem"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"/>
    <TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/id_imgItem"
        android:paddingTop="4dp"
        android:paddingBottom="4dp"
        android:gravity="center_horizontal"
        android:textSize="18sp"/>

</RelativeLayout>

我希望将图像加载到屏幕外，因此有一个无缝的用户体验，如以下视频：

这些视频来自一篇博客文章，该文章使用LinearLayoutManager而不是StaggedGridLayoutManager解决了这个问题。我似乎无法找到解决这个问题的等效方法。我对安卓系统的开发还比较陌生，并尝试阅读了文档，但似乎找不到任何解决方案

代码：

    // Setup RecyclerView
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.gridview_posts);
    mRecyclerView.setHasFixedSize(true);

    // Setup StaggeredGridLayoutManager
    mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
    mRecyclerView.setLayoutManager(mLayoutManager);

    // Set Adapter
    mPostsAdapter = new PostAdapter(rootView.getContext(), posts);
    mRecyclerView.setAdapter(mPostsAdapter);

    // Start RestClient & get posts
    restClient = new RestClient(getString(R.string.api_location));
    getPosts();

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="2dp"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ImageView
        android:id="@+id/id_imgItem"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"/>
    <TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/id_imgItem"
        android:paddingTop="4dp"
        android:paddingBottom="4dp"
        android:gravity="center_horizontal"
        android:textSize="18sp"/>

</RelativeLayout>

---

预加载要在缓存中显示的图像，这样在滚动列表时就不会加载它们了，它们已经在内存中了

 Picasso.with(this).load("url").fetch();

此外，删除毕加索·法登动画

Picasso.with(this).load("url").noFade().into(imageView);

---

刚刚找到了解决我自己问题的部分方法。我会为任何像我这样想弄明白这一点的新手发布

RecyclerView方法setItemViewCacheSize（int-size）将保留缓存中项目的需求量，这样就不会有闪烁类型的视图加载

我还没有找到一个前瞻性的解决方案来提前加载特定数量的视图。

对我来说，它很有效

Picasso.get()
 .load(uploadCurrent.getImageUrl())
 .placeholder(R.drawable.logoblack_loading)
 .config(Bitmap.Config.RGB_565)
 .into(holder.imageView);

XML:

    // Setup RecyclerView
    mRecyclerView = (RecyclerView) rootView.findViewById(R.id.gridview_posts);
    mRecyclerView.setHasFixedSize(true);

    // Setup StaggeredGridLayoutManager
    mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
    mRecyclerView.setLayoutManager(mLayoutManager);

    // Set Adapter
    mPostsAdapter = new PostAdapter(rootView.getContext(), posts);
    mRecyclerView.setAdapter(mPostsAdapter);

    // Start RestClient & get posts
    restClient = new RestClient(getString(R.string.api_location));
    getPosts();

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="2dp"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ImageView
        android:id="@+id/id_imgItem"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"/>
    <TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/id_imgItem"
        android:paddingTop="4dp"
        android:paddingBottom="4dp"
        android:gravity="center_horizontal"
        android:textSize="18sp"/>

</RelativeLayout>

---

所有图像都已从缓存加载，当我设置noFade（）时，图像会在屏幕上显示时弹出。我需要以某种方式将布局的大小设置为大于物理屏幕的大小，以便在用户看到卡之前将其弹出到位。