按下按钮时如何更改图像比例类型

分类：编程问答

如何解决按下按钮时如何更改图像比例类型

你好，我正在尝试在当前按下按钮时更改 imageView scaleType 我使用 centercrop（作为默认值）我希望当按下按钮时它会更改为适合中心，反之亦然

例如：1 Instagram :- 当您将照片上传到您的帖子时， 一个调整图像裁剪的按钮

2 youtube :- 在 youtube 中，如果您注意到家里有一些 单击图像时上传图像的社区选项卡 改变作物，反之亦然

还有一个与此相关的小问题，即如何在按下时更改按钮（按钮是 ImageView）背景，反之亦然

就像我想在适配器类中使用它

imagepost_buttons.xml // 切换比例类型的按钮

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/relativeLayoutImagePost"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="10dp"
        android:layout_marginStart="15dp"
        android:contentDescription="@string/todo"
        android:gravity="center"
        android:elevation="10dp"
        android:src="@drawable/ic_baseline_open_in_full_24" />
</RelativeLayout>

circular_scaling_background.xml // 当按钮（ImageView）被按下时我想改变的背景，反之亦然

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">

    <solid android:color="@color/lite_grey"/>
    <stroke android:width="0dp" android:color="@color/lite_grey"/>
    <size android:width="24dp" android:height="24dp"/>

</shape>

post_item_container_home.xml // 我想改变 scaleType 的 ImageView

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_centerInParent="true"
    android:background="@color/black"
    android:orientation="vertical"
    android:weightSum="5">

    <com.google.android.material.card.MaterialCardView
        android:id="@+id/Card_View"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginStart="5dp"
        android:layout_marginEnd="5dp"
        android:layout_weight="4"
        app:cardBackgroundColor="@color/black"
        app:shapeAppearanceOverlay="@style/RoundedCornerHome">

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <com.google.android.material.imageview.ShapeableImageView
                android:id="@+id/imagePostHome"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="center"
                android:adjustViewBounds="true"
                android:contentDescription="@string/todo"
                android:scaleType="centerCrop"
                app:shapeAppearanceOverlay="@style/RoundedCornerHome" />

            <include
                android:id="@+id/imagepost_buttons"
                layout="@layout/imagepost_buttons" />
        </FrameLayout>

    </com.google.android.material.card.MaterialCardView>

    <com.google.android.material.card.MaterialCardView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginStart="5dp"
        android:layout_marginTop="10dp"
        android:layout_marginEnd="5dp"
        android:layout_marginBottom="10dp"
        android:layout_weight="1"
        app:cardBackgroundColor="@color/grey"
        app:shapeAppearanceOverlay="@style/RoundedCornerHome">

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <include
                android:id="@+id/material_cardview_snipet"
                layout="@layout/material_cardview_snipet" />
        </FrameLayout>


    </com.google.android.material.card.MaterialCardView>


</LinearLayout>

PostAdapter_Home.java // 适配器类

public class PostAdapter_Home extends RecyclerView.Adapter<PostAdapter_Home.PostViewHolder> {
    public static List<Upload> mUploads;
    public Context mcontext;

    public PostAdapter_Home(Context context,List<Upload> uploads) {
        mUploads = uploads;
        mcontext = context;
    }


    @NonNull
    @Override
    public PostViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        View view;
        view = LayoutInflater.from(mcontext).inflate(R.layout.post_item_container_home,parent,false);
        return new PostViewHolder(view);

    }

    @Override
    public void onBindViewHolder(@NonNull PostViewHolder holder,int position) {
        Home_Fragment.saved_position = holder.getAbsoluteAdapterPosition();
        Home_Fragment.saved_position = 0;
        Upload uploadCurrent = mUploads.get(position);
        Shimmer shimmer = new Shimmer.ColorHighlightBuilder()
                .setBaseColor(Color.parseColor("#F3F3F3"))
                .setBaseAlpha(1)
                .setHighlightColor(Color.parseColor("#E7E7E7"))
                .setHighlightAlpha(1)
                .setDropoff(50)
                .build();
        ShimmerDrawable shimmerDrawable = new ShimmerDrawable();
        shimmerDrawable.setShimmer(shimmer);
        Glide.with(mcontext)
                .load(uploadCurrent.getmImageUrl())
                .diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                .placeholder(shimmerDrawable)
                .into(holder.imageView);


    }

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

    public static class PostViewHolder extends RecyclerView.ViewHolder {
        ShapeableImageView imageView;

        public PostViewHolder(@NonNull View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imagePostHome);
        }


        public int getAbsoluteAdapterPosition() {
            return 0;
        }
    }
}

更新 1

PostAdapter_Home.java // 从答案更新 // 它不起作用我知道我搞砸了，我不知道如何准确地实现它

public class PostAdapter_Home extends RecyclerView.Adapter<PostAdapter_Home.PostViewHolder> {
    public static List<Upload> mUploads;
    public Context mcontext;
    View view;

    public PostAdapter_Home(Context context,int position) {
        Home_Fragment.saved_position = holder.getAbsoluteAdapterPosition();
        changeScaleType(position);


    }

    private void changeScaleType(int position) {
        ShapeableImageView imageView;
        imageView = view.findViewById(R.id.imagePostHome);
        Home_Fragment.saved_position = 0;
        Upload uploadCurrent = mUploads.get(position);
        Shimmer shimmer = new Shimmer.ColorHighlightBuilder()
                .setBaseColor(Color.parseColor("#F3F3F3"))
                .setBaseAlpha(1)
                .setHighlightColor(Color.parseColor("#E7E7E7"))
                .setHighlightAlpha(1)
                .setDropoff(50)
                .build();
        ShimmerDrawable shimmerDrawable = new ShimmerDrawable();
        shimmerDrawable.setShimmer(shimmer);
        String imgTag = imageView.getTag().toString();
        Log.e(TAG,"imgTag---" + imgTag);
        if (imgTag.equals("")) {
            Glide.with(mcontext).load(uploadCurrent.getmImageUrl()).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                    .placeholder(shimmerDrawable).fitCenter().into(imageView);
            imageView.setTag("centerInside");
        } else {
            if (imgTag.equals("centerCrop")) {
                Glide.with(mcontext).load(uploadCurrent.getmImageUrl()).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                        .placeholder(shimmerDrawable).fitCenter().into(imageView);
                imageView.setTag("centerInside");
            } else {
                Glide.with(mcontext).load(uploadCurrent.getmImageUrl()).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                        .placeholder(shimmerDrawable).centerCrop().into(imageView);
                imageView.setTag("centerCrop");
            }
        }

    }

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

    public static class PostViewHolder extends RecyclerView.ViewHolder {
        ShapeableImageView imageView;

        public PostViewHolder(@NonNull View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imagePostHome);
        }


        public int getAbsoluteAdapterPosition() {
            return 0;
        }
    }
}

解决方法

试试这个：

private void changeScaleType(){
                String imgTag = imagePostHome.getTag().toString();
                Log.e(TAG,"imgTag---"+imgTag);
                if(imgTag.equals("")){
                    Glide.with(this).load(imgUrl).fitCenter().into(imagePostHome);
                    imagePostHome.setTag("centerInside");
                }else {
                    if (imgTag.equals("centerCrop")) {
                        Glide.with(this).load(imgUrl).fitCenter().into(imagePostHome);
                        imagePostHome.setTag("centerInside");
                    }else{
                        Glide.with(this).load(imgUrl).centerCrop().into(imagePostHome);
                        imagePostHome.setTag("centerCrop");
                    }
                }
            }
  • 将标签设置为 imageView
  • 在使用 Glide 将图像加载到 imageview 时，在单击视图时将 fitCenter 和 centerCrop 添加到代码中

编辑：

点击视图时调用 changeScaleType() 方法，负责更改 imagevew 的缩放类型，例如，在你的情况下，relativeLayoutImagePost 负责更改 imagevew 的缩放类型。

在 PostViewHolder 类中的视图的 FindViewById，在 Adapter 的 onBindViewHolder 方法中为视图添加值

这是适配器的编码：

public class PostAdapter_Home extends RecyclerView.Adapter<PostAdapter_Home.PostViewHolder> {
    private static String TAG = PostAdapter_Home.class.getSimpleName();
    public static List<Upload> mUploads;
    public Context mcontext;
    View view;

    public PostAdapter_Home(Context context,List<Upload> uploads) {
        mUploads = uploads;
        mcontext = context;
    }
    
    @NonNull
    @Override
    public PostViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        View view;
        view = LayoutInflater.from(mcontext).inflate(R.layout.post_item_container_home,parent,false);
        return new PostViewHolder(view);

    }

    @Override
    public void onBindViewHolder(@NonNull PostViewHolder holder,int position) {
        Shimmer shimmer = new Shimmer.ColorHighlightBuilder()
                .setBaseColor(Color.parseColor("#F3F3F3"))
                .setBaseAlpha(1)
                .setHighlightColor(Color.parseColor("#E7E7E7"))
                .setHighlightAlpha(1)
                .setDropoff(50)
                .build();
        ShimmerDrawable shimmerDrawable = new ShimmerDrawable();
        shimmerDrawable.setShimmer(shimmer);
        Upload uploadCurrent = mUploads.get(position);
        Glide.with(mcontext).load(uploadCurrent.getmImageUrl()).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                .placeholder(shimmerDrawable).fitCenter().into(holder.imagePostHome);

        holder.relativeLayoutImagePost.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                changeScaleType(holder,position);
            }
        });

    }

    private void changeScaleType(PostViewHolder holder,int position) {
        Shimmer shimmer = new Shimmer.ColorHighlightBuilder()
                .setBaseColor(Color.parseColor("#F3F3F3"))
                .setBaseAlpha(1)
                .setHighlightColor(Color.parseColor("#E7E7E7"))
                .setHighlightAlpha(1)
                .setDropoff(50)
                .build();
        ShimmerDrawable shimmerDrawable = new ShimmerDrawable();
        shimmerDrawable.setShimmer(shimmer);
        
        Upload uploadCurrent = mUploads.get(position);
        String imgTag = holder.imagePostHome.getTag().toString();
        Log.e(TAG,"imgTag---" + imgTag);
        if (imgTag.equals("")) {
            Glide.with(mcontext).load(uploadCurrent.getmImageUrl()).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                    .placeholder(shimmerDrawable) .fitCenter().into( holder.imagePostHome);
            holder.imagePostHome.setTag("centerInside");
        } else {
            if (imgTag.equals("centerCrop")) {
                Glide.with(mcontext).load(uploadCurrent.getmImageUrl()).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                        .placeholder(shimmerDrawable) .fitCenter().into( holder.imagePostHome);
                holder.imagePostHome.setTag("centerInside");
            } else {
                Glide.with(mcontext).load(uploadCurrent.getmImageUrl()).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                        .placeholder(shimmerDrawable).centerCrop().into( holder.imagePostHome);
                holder.imagePostHome.setTag("centerCrop");
            }
        }

    }

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

    public static class PostViewHolder extends RecyclerView.ViewHolder {

        private MaterialCardView CardView;
        private ShapeableImageView imagePostHome;
        private RelativeLayout relativeLayoutImagePost;

        public PostViewHolder(@NonNull View itemView) {
            super(itemView);

            CardView = itemView.findViewById(R.id.Card_View);
            imagePostHome = itemView.findViewById(R.id.imagePostHome);
            relativeLayoutImagePost = itemView.findViewById(R.id.relativeLayoutImagePost);

        }


    }
}

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