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android – 单击AlertDialog项目列表时在RecyclerView布局之间切换

Android   发布时间：2022-04-28  发布网站：大佬教程  code.js-code.com
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我有三种不同的布局cardListLayout,titleLayout,cardMagazineLayout,将来可能会有更多,用作onCreateViewHolder方法的视图.

我想在onCreateViewHolder方法中切换视图,以便用户从AlertDialog列表中选择

这个在MainActivity中的onOptionsItemSELEcted其中有菜单项“更改布局”,以便当用户按下它时出现AlertDialog列表

@Override
    public Boolean onOptionsItemSELEcted(MenuItem item) {
        if (item.getItemId() == R.id.change_layout) {
            AlertDialog.builder builder = new AlertDialog.builder(this);
            builder.settitle(getString(R.String.choose_layout));

            String[] layouts = {"title Layout","Cards List","Card Magazine Layout"};
            builder.setItems(layouts,new DialogInterface.onClickListener() {
                @Override
                public void onClick(DialogInterface dialog,int indeX) {
                    switch (indeX) {
                        case 0: // title layout
                            Toast.makeText(MainActivity.this,"title layout",Toast.LENGTH_LONG).show();
                            break;
                        case 1: // Cards List
                            Toast.makeText(MainActivity.this,"Card list",Toast.LENGTH_LONG).show();
                            break;
                        case 2: // Cards Magazine Layout
                            Toast.makeText(MainActivity.this,"Card Magazine Layout",Toast.LENGTH_LONG).show();
                    }
                }
            });

这是我的自定义适配器类PostAdapter

public class PostAdapter extends RecyclerView.Adapter<PostAdapter.PostViewHolder> {
    private Context context;
    private List<Item> items;

    public PostAdapter(Context context,List<Item> items) {
        this.context = context;
        this.items = items;
    }

    @NonNull
    @Override
    public PostAdapter.PostViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewTypE) {
        LayoutInflater inflater = LayoutInflater.from(context);

// here's the three layouts that I can't switch between it

        View cardsListLayout = inflater.inflate(R.layout.post_item_card_layout,parent,falsE);
        View titleLayout = inflater.inflate(R.layout.post_item_grid_layout,falsE);
        View cardMagazineLayout = inflater.inflate(R.layout.card_magazine_layout,falsE);

        return new PostViewHolder(titleLayout);
    }

    @Override
    public void onBindViewHolder(@NonNull PostViewHolder holder,int position) {
        final Item item = items.get(position);
        holder.posttitle.setText(item.gettitle());
        final Document document = Jsoup.parse(item.getContent());
        Elements elements = document.SELEct("img");


        Log.e("CODE","Image: " + elements.get(0).attr("src"));
//        Log.d("Text",document.text());
//        holder.postDescription.setText(document.text());

        Glide.with(context).load(elements.get(0).attr("src"))
                .into(holder.postImagE);

        holder.itemView.setOnClickListener(new View.onClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(context,DetailsActivity.class);
                intent.putExtra("url",item.getUrl());
                intent.putExtra("title",item.gettitle());
                intent.putExtra("content",item.getContent());
                int youtubeThumbnailImagesetVisibility = 0;

                Element element = document.body();

                String youtubeThumbnailImageSrc = "";
                String youTubeLink = "";
                for (Element e : element.getElementsByClass
                        ("YOUTUBE-iframe-video")) {
                    youtubeThumbnailImageSrc = e.attr("data-thumbnail-src");
                    youTubeLink = e.attr("src");
                    Log.e("YouTube thumbnail",youtubeThumbnailImageSrc);
                    Log.e("Youtube link",youTubeLink);
                }

                if (youtubeThumbnailImageSrc.isEmpty()) {
                    youtubeThumbnailImagesetVisibility = 8;
                    intent.putExtra("youtubeThumbnailImagesetVisibility",youtubeThumbnailImagesetVisibility);
                } else {
                    intent.putExtra("youtubeThumbnailImageSrc",youtubeThumbnailImageSrc);
                    intent.putExtra("youTubeLink",youTubeLink);
                }

//             String imageSrc = elements.get(0).attr("src");
//             intent.putExtra("blogImage",imageSrc);

                context.startActivity(intent);
            }
        });

    }

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

    public class PostViewHolder extends RecyclerView.ViewHolder {

        ImageView postImage;
        TextView posttitle;
        TextView postDescription;

        public PostViewHolder(View itemView) {
            super(itemView);
            postImage = itemView.findViewById(R.id.postImagE);
            posttitle = itemView.findViewById(R.id.posttitlE);
            postDescription = itemView.findViewById(R.id.postDescription);

        }
    }

}

我为每一个创建了两个不同的布局管理器,有一个linearlayoutmanager和GridLayoutManager,目前我使用了GridLayout,所以我暂时评论了LinearLayoutmanger,直到我知道如何在它们之间切换

//      linearlayoutmanager = new linearlayoutmanager(this);
        gridLayoutManager = new GridLayoutManager(this,2,RecyclerView.VERTICAL,falsE);
//        recyclerView.setLayoutManager(linearlayoutmanager);
        recyclerView.setLayoutManager(gridLayoutManager);

我渴望的结果

解决方法

无需为此使用多个Recyclerview

您可以使用具有多个viewType的单个Recyclerview实现此目的

当您想要更改Recyclerview的布局时,只需更改Recyclerview的LayoutManager和viewType即可

示例代码

试试这种方式

首先为多个viewType创建三个布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://scheR_768_11845@as.android.com/apk/res/android"
    xmlns:app="http://scheR_768_11845@as.android.com/apk/res-auto"
    android:layout_width="150dp"
    android:layout_height="150dp"
    app:cardElevation="10dp"
    app:cardUseCompatPadding="true">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="150dp"
            android:adjustViewBounds="true"
            android:contentDescription="@String/app_name"
            android:scaleType="centerCrop"
            android:src="@drawable/dishu" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:BACkground="#6a000000"
            android:gravity="center"
            android:padding="10dp"
            android:text="dummy text"
            android:textColor="@android:color/white" />
    </RelativeLayout>

</android.support.v7.widget.CardView>
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://scheR_768_11845@as.android.com/apk/res/android"
    xmlns:app="http://scheR_768_11845@as.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardElevation="10dp"
    app:cardUseCompatPadding="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="150dp"
            android:adjustViewBounds="true"
            android:contentDescription="@String/app_name"
            android:scaleType="centerCrop"
            android:src="@drawable/dishu" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingStart="5dp"
            android:paddingend="10dp"
            android:text="Dummy title"
            android:textColor="@android:color/black"
            android:textStyle="bold" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingStart="5dp"
            android:paddingend="10dp"
            android:text="Dummy Tex" />


    </LinearLayout>
</android.support.v7.widget.CardView>
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://scheR_768_11845@as.android.com/apk/res/android"
    xmlns:app="http://scheR_768_11845@as.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardElevation="10dp"
    app:cardUseCompatPadding="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingStart="5dp"
                android:paddingend="5dp"
                android:text="dummy text"
                android:textColor="@android:color/black"
                android:textStyle="bold" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="start"
                android:paddingStart="5dp"
                android:paddingend="5dp"
                android:text="I have three different layouts cardsListLayout,cardMagazineLayoutand there may be more in the future,which used as a views on onCreateViewHolder method." />
        </LinearLayout>

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="150dp"
            android:adjustViewBounds="true"
            android:contentDescription="@String/app_name"
            android:scaleType="centerCrop"
            android:src="@drawable/dishu" />


    </LinearLayout>
</android.support.v7.widget.CardView>
package neel.com.recyclerviewdemo;
import android.content.Context;
import android.support.Annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class DataAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    public static final int ITEM_TYPE_GRID = 0;
    public static final int ITEM_TYPE_CARD_LIST = 1;
    public static final int ITEM_TYPE_titlE_LIST = 2;
    private Context mContext;
    privatE int VIEW_TYPE = 0;

    public DataAdapter(Context mContext) {
        this.mContext = mContext;
    }

    public void setVIEW_TYPE(int viewTypE) {
        VIEW_TYPE = viewType;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewTypE) {
        View view = null;
        // check here the viewType and return RecyclerView.ViewHolder based on view type
        switch (VIEW_TYPE) {
            case ITEM_TYPE_GRID:
                // if VIEW_TYPE is Grid than return GridViewHolder
                view = LayoutInflater.from(mContext).inflate(R.layout.grid_layout,falsE);
                return new GridViewHolder(view);
            case ITEM_TYPE_CARD_LIST:
                // if VIEW_TYPE is Card List than return CardListViewHolder
                view = LayoutInflater.from(mContext).inflate(R.layout.cardlist_layout,falsE);
                return new CardListViewHolder(view);
            case ITEM_TYPE_titlE_LIST:
                // if VIEW_TYPE is title List than return titleListViewHolder
                view = LayoutInflater.from(mContext).inflate(R.layout.title_layout,falsE);
                return new titleListViewHolder(view);
        }
        return new GridViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder,int position) {
        final int itemType = getItemViewType(position);
        // First check here the View Type
        // than set data based on View Type to your recyclerview item
        if (itemType == ITEM_TYPE_GRID) {
        if (holder instanceof CardViewHolder) {
            GridViewHolder viewHolder = (GridViewHolder) holder;
            // write here code for your grid list
      }
        } else if (itemType == ITEM_TYPE_CARD_LIST) {
       if (holder instanceof CardViewHolder) {
            CardListViewHolder buttonViewHolder = (CardListViewHolder) holder;
            // write here code for your grid list
       }
        } else if (itemType == ITEM_TYPE_titlE_LIST) {
            if (holder instanceof CardViewHolder) {
            titleListViewHolder buttonViewHolder = (titleListViewHolder) holder;
            // write here code for your titleListViewHolder
          }
        }
    }

    @Override
    public int getItemCount() {
        return 40;
    }

    // RecyclerView.ViewHolder class for gridLayoutManager
    public class GridViewHolder extends RecyclerView.ViewHolder {

        public GridViewHolder(@NonNull View itemView) {
            super(itemView);
        }
    }

    // RecyclerView.ViewHolder class for Card list View
    public class CardListViewHolder extends RecyclerView.ViewHolder {

        public CardListViewHolder(@NonNull View itemView) {
            super(itemView);
        }
    }

    // RecyclerView.ViewHolder class for title list View
    public class titleListViewHolder extends RecyclerView.ViewHolder {

        public titleListViewHolder(@NonNull View itemView) {
            super(itemView);
        }
    }
}
package neel.com.recyclerviewdemo;
import android.content.DialogInterface;
import android.os.bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity {

    DataAdapter dataAdapter;
    private RecyclerView myRecyclerView;
    private linearlayoutmanager linearlayoutmanager;
    private GridLayoutManager gridLayoutManager;

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

        myRecyclerView = findViewById(R.id.myRecyclerView);
        myRecyclerView.setHasFixedSize(true);

        linearlayoutmanager = new linearlayoutmanager(this);
        gridLayoutManager = new GridLayoutManager(this,3);

        myRecyclerView.setLayoutManager(gridLayoutManager);

        dataAdapter = new DataAdapter(this);
        myRecyclerView.setAdapter(dataAdapter);
    }

    @Override
    public Boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.home_menu,menu);
        // return true so that the menu pop up is opened
        return true;
    }

    @Override
    public Boolean onOptionsItemSELEcted(MenuItem item) {

        if (item.getItemId() == R.id.action_dialog) {
            AlertDialog.builder builder = new AlertDialog.builder(this);
            builder.settitle("Please choose a layout");

            String[] layouts = {"title Layout","Grid View"};
            builder.setItems(layouts,int indeX) {
                    switch (indeX) {
                        case 0: // title layout
                            dataAdapter.setVIEW_TYPE(2);
                            myRecyclerView.setLayoutManager(linearlayoutmanager);
                            myRecyclerView.setAdapter(dataAdapter);
                            break;
                        case 1: // Cards List
                            dataAdapter.setVIEW_TYPE(1);
                            myRecyclerView.setLayoutManager(linearlayoutmanager);
                            myRecyclerView.setAdapter(dataAdapter);
                            break;
                        case 2: // Grid  Layout
                            dataAdapter.setVIEW_TYPE(0);
                            myRecyclerView.setLayoutManager(gridLayoutManager);
                            myRecyclerView.setAdapter(dataAdapter);
                    }
                }
            });

            builder.show();
        }
        return super.onOptionsItemSELEcted(item);
    }
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://scheR_768_11845@as.android.com/apk/res/android"
    xmlns:tools="http://scheR_768_11845@as.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/myRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

OUTPUT

https://youtu.be/L3slKTy2bzI

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