java Android Cardview点击不同的活动

Question

我很难弄明白这一点。我正在创建一个Android应用程序，用户（登录后）会在回收器视图中看到一个带有cardview列表的活动

我希望用户能够点击一张卡片，进入另一个活动。如果你点击卡片1，你必须进入游戏1的活动。如果你点击卡片2，你必须进入游戏2的活动。等等

这是我登录后的“主要”活动：

package com.afmob.gaming;

import 安卓.content.Intent;
import 安卓.content.res.Resources;
import 安卓.graphics.Rect;
import 安卓.support.design.widget.AppBarLayout;
import 安卓.support.design.widget.CollapsingToolbarLayout;
import 安卓.support.v7.app.AppCompatActivity;
import 安卓.support.v7.widget.DefaultItemAnimator;
import 安卓.support.v7.widget.GridLayoutManager;
import 安卓.support.v7.widget.RecyclerView;
import 安卓.support.v7.widget.Toolbar;
import 安卓.os.Bundle;
import 安卓.util.Log;
import 安卓.util.TypedValue;
import 安卓.view.Menu;
import 安卓.view.MenuInflater;
import 安卓.view.MenuItem;
import 安卓.view.View;
import 安卓.widget.Button;
import 安卓.widget.ImageView;
import 安卓.widget.Toast;

import com.bumptech.glide.Glide;

import java.util.ArrayList;
import java.util.List;

public class GamesCatalog extends AppCompatActivity {

    private Toolbar toolbar;

    // Added for cardview
    private RecyclerView recyclerView;
    private AlbumsAdapter adapter;
    private List<Album> albumList;

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

        // Might have to change the toolbar to the system one, also in the xml file

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        // Added for cardview
        initCollapsingToolbar();

        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        albumList = new ArrayList<>();
        adapter = new AlbumsAdapter(this, albumList);

        RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 2);
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.addItemDecoration(new GridSpacingItemDecoration(2, dpToPx(10), true));
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(adapter);

        prepareAlbums();

        try {
            Glide.with(this).load(R.drawable.cover).into((ImageView) findViewById(R.id.backdrop));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // Added for cardview
    /**
     * Initializing collapsing toolbar
     * Will show and hide the toolbar title on scroll
     */
    private void initCollapsingToolbar() {
        final CollapsingToolbarLayout collapsingToolbar =
                (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
        collapsingToolbar.setTitle(" ");
        AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.appbar);
        appBarLayout.setExpanded(true);

        // hiding & showing the title when toolbar expanded & collapsed
        appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
            boolean isShow = false;
            int scrollRange = -1;

            @Override
            public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                if (scrollRange == -1) {
                    scrollRange = appBarLayout.getTotalScrollRange();
                }
                if (scrollRange + verticalOffset == 0) {
                    collapsingToolbar.setTitle(getString(R.string.app_name));
                    isShow = true;
                } else if (isShow) {
                    collapsingToolbar.setTitle(" ");
                    isShow = false;
                }
            }
        });
    }

    /**
     * Adding few albums for testing
     */
    private void prepareAlbums() {
        int[] covers = new int[]{
                R.drawable.album1,
                R.drawable.album2,
                R.drawable.album3,
                R.drawable.album4,
                R.drawable.album5,
                R.drawable.album6,
                R.drawable.album7,
                R.drawable.album8,
                R.drawable.album9,
                R.drawable.album10,
                R.drawable.album11};

        Album a = new Album("Maroon5", 13, covers[0]);
        albumList.add(a);

        a = new Album("Sugar Ray", 8, covers[1]);
        albumList.add(a);

        a = new Album("Bon Jovi", 11, covers[2]);
        albumList.add(a);

        a = new Album("The Corrs", 12, covers[3]);
        albumList.add(a);

        a = new Album("The Cranberries", 14, covers[4]);
        albumList.add(a);

        a = new Album("Westlife", 1, covers[5]);
        albumList.add(a);

        a = new Album("Black Eyed Peas", 11, covers[6]);
        albumList.add(a);

        a = new Album("VivaLaVida", 14, covers[7]);
        albumList.add(a);

        a = new Album("The Cardigans", 11, covers[8]);
        albumList.add(a);

        a = new Album("Pussycat Dolls", 17, covers[9]);
        albumList.add(a);

        adapter.notifyDataSetChanged();
    }

    /**
     * RecyclerView item decoration - give equal margin around grid item
     */
    public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {

        private int spanCount;
        private int spacing;
        private boolean includeEdge;

        public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
            this.spanCount = spanCount;
            this.spacing = spacing;
            this.includeEdge = includeEdge;
        }

        @Override
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
            int position = parent.getChildAdapterPosition(view); // item position
            int column = position % spanCount; // item column

            if (includeEdge) {
                outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)
                outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)

                if (position < spanCount) { // top edge
                    outRect.top = spacing;
                }
                outRect.bottom = spacing; // item bottom
            } else {
                outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)
                outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f /    spanCount) * spacing)
                if (position >= spanCount) {
                    outRect.top = spacing; // item top
                }
            }
        }
    }

    /**
     * Converting dp to pixel
     */
    private int dpToPx(int dp) {
        Resources r = getResources();
        return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, r.getDisplayMetrics()));
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_main, menu);
        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        if (id==R.id.navigate) {
            startActivity(new Intent(this, SettingsActivity.class));
        }
        return super.onOptionsItemSelected(item);
    }
}

这是我的适配器：

package com.afmob.gaming;

import 安卓.content.Context;
import 安卓.support.v7.widget.PopupMenu;
import 安卓.support.v7.widget.RecyclerView;
import 安卓.view.LayoutInflater;
import 安卓.view.MenuInflater;
import 安卓.view.MenuItem;
import 安卓.view.View;
import 安卓.view.ViewGroup;
import 安卓.widget.ImageView;
import 安卓.widget.TextView;
import 安卓.widget.Toast;

import com.bumptech.glide.Glide;

import java.util.List;

/**
 * Created by Ravi Tamada on 18/05/16.
 */
public class AlbumsAdapter extends RecyclerView.Adapter<AlbumsAdapter.MyViewHolder> {

    private Context mContext;
    private List<Album> albumList;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, count;
        public ImageView thumbnail, overflow;

        public MyViewHolder(View view) {
            super(view);
            title = (TextView) view.findViewById(R.id.title);
            count = (TextView) view.findViewById(R.id.count);
            thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
            overflow = (ImageView) view.findViewById(R.id.overflow);
        }
    }


    public AlbumsAdapter(Context mContext, List<Album> albumList) {
        this.mContext = mContext;
        this.albumList = albumList;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.album_card, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {
        Album album = albumList.get(position);
        holder.title.setText(album.getName());
        holder.count.setText(album.getNumOfSongs() + " songs");

        // loading album cover using Glide library
        Glide.with(mContext).load(album.getThumbnail()).into(holder.thumbnail);

        holder.overflow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showPopupMenu(holder.overflow);
            }
        });
    }

    /**
     * Showing popup menu when tapping on 3 dots
     */
    private void showPopupMenu(View view) {
        // inflate menu
        PopupMenu popup = new PopupMenu(mContext, view);
        MenuInflater inflater = popup.getMenuInflater();
        inflater.inflate(R.menu.menu_album, popup.getMenu());
        popup.setOnMenuItemClickListener(new MyMenuItemClickListener());
        popup.show();
    }

    /**
     * Click listener for popup menu items
     */
    class MyMenuItemClickListener implements PopupMenu.OnMenuItemClickListener {

        public MyMenuItemClickListener() {
        }

        @Override
        public boolean onMenuItemClick(MenuItem menuItem) {
            switch (menuItem.getItemId()) {
                case R.id.action_add_favourite:
                    Toast.makeText(mContext, "Add to favourite", Toast.LENGTH_SHORT).show();
                    return true;
                case R.id.action_play_next:
                    Toast.makeText(mContext, "Play next", Toast.LENGTH_SHORT).show();
                    return true;
                default:
            }
            return false;
        }
    }

    // Added in for click on each card


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

这是每张卡片的样子：

<LinearLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
    xmlns:card_view="http://schemas.安卓.com/apk/res-auto"
    安卓:layout_width="match_parent"
    安卓:layout_height="wrap_content">

    <安卓.support.v7.widget.CardView
        安卓:id="@+id/card_view"
        安卓:layout_width="match_parent"
        安卓:layout_height="match_parent"
        安卓:layout_gravity="center"
        安卓:layout_margin="@dimen/card_margin"
        安卓:elevation="3dp"
        card_view:cardCornerRadius="@dimen/card_album_radius">

        <RelativeLayout
            安卓:layout_width="match_parent"
            安卓:layout_height="match_parent">

            <ImageView
                安卓:id="@+id/thumbnail"
                安卓:layout_width="match_parent"
                安卓:layout_height="@dimen/album_cover_height"
                安卓:background="?attr/selectableItemBackgroundBorderless"
                安卓:clickable="true"
                安卓:scaleType="fitXY" />

            <TextView
                安卓:id="@+id/title"
                安卓:layout_width="match_parent"
                安卓:layout_height="wrap_content"
                安卓:layout_below="@id/thumbnail"
                安卓:paddingLeft="@dimen/album_title_padding"
                安卓:paddingRight="@dimen/album_title_padding"
                安卓:paddingTop="@dimen/album_title_padding"
                安卓:textColor="@color/album_title"
                安卓:textSize="@dimen/album_title" />

            <TextView
                安卓:id="@+id/count"
                安卓:layout_width="match_parent"
                安卓:layout_height="wrap_content"
                安卓:layout_below="@id/title"
                安卓:paddingBottom="@dimen/songs_count_padding_bottom"
                安卓:paddingLeft="@dimen/album_title_padding"
                安卓:paddingRight="@dimen/album_title_padding"
                安卓:textSize="@dimen/songs_count" />

            <ImageView
                安卓:id="@+id/overflow"
                安卓:layout_width="@dimen/ic_album_overflow_width"
                安卓:layout_height="@dimen/ic_album_overflow_height"
                安卓:layout_alignParentRight="true"
                安卓:layout_below="@id/thumbnail"
                安卓:layout_marginTop="@dimen/ic_album_overflow_margin_top"
                安卓:scaleType="centerCrop"
                安卓:src="@drawable/ic_dots" />

        </RelativeLayout>

    </安卓.support.v7.widget.CardView>

</LinearLayout>

这就是recyclerview的外观：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
    xmlns:app="http://schemas.安卓.com/apk/res-auto"
    xmlns:tools="http://schemas.安卓.com/tools"
    安卓:layout_width="match_parent"
    安卓:layout_height="match_parent"
    安卓:background="@color/viewBg"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.afmob.gaming.GamesCatalog"
    tools:showIn="@layout/games_catalog">

    <安卓.support.v7.widget.RecyclerView
        安卓:id="@+id/recycler_view"
        安卓:layout_width="match_parent"
        安卓:layout_height="wrap_content"
        安卓:clipToPadding="false"
        安卓:scrollbars="vertical" />

</RelativeLayout>

主要观点如下：

<?xml version="1.0" encoding="utf-8"?>
<安卓.support.design.widget.CoordinatorLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
    xmlns:app="http://schemas.安卓.com/apk/res-auto"
    安卓:id="@+id/main_content"
    安卓:layout_width="match_parent"
    安卓:layout_height="match_parent"
    安卓:background="@安卓:color/white"
    安卓:fitsSystemWindows="true">

    <安卓.support.design.widget.AppBarLayout
        安卓:id="@+id/appbar"
        安卓:layout_width="match_parent"
        安卓:layout_height="@dimen/detail_backdrop_height"
        安卓:fitsSystemWindows="true"
        安卓:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <安卓.support.design.widget.CollapsingToolbarLayout
            安卓:id="@+id/collapsing_toolbar"
            安卓:layout_width="match_parent"
            安卓:layout_height="match_parent"
            安卓:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginEnd="64dp"
            app:expandedTitleMarginStart="48dp"
            app:expandedTitleTextAppearance="@安卓:color/transparent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <RelativeLayout
                安卓:layout_width="wrap_content"
                安卓:layout_height="wrap_content">

                <ImageView
                    安卓:id="@+id/backdrop"
                    安卓:layout_width="match_parent"
                    安卓:layout_height="match_parent"
                    安卓:fitsSystemWindows="true"
                    安卓:scaleType="centerCrop"
                    app:layout_collapseMode="parallax" />

                <LinearLayout
                    安卓:layout_width="wrap_content"
                    安卓:layout_height="wrap_content"
                    安卓:layout_centerInParent="true"
                    安卓:gravity="center_horizontal"
                    安卓:orientation="vertical">

                    <TextView
                        安卓:id="@+id/love_music"
                        安卓:layout_width="wrap_content"
                        安卓:layout_height="wrap_content"
                        安卓:text="@string/backdrop_title"
                        安卓:textColor="@安卓:color/white"
                        安卓:textSize="@dimen/backdrop_title" />

                    <TextView
                        安卓:layout_width="wrap_content"
                        安卓:layout_height="wrap_content"
                        安卓:text="@string/backdrop_subtitle"
                        安卓:textColor="@安卓:color/white"
                        安卓:textSize="@dimen/backdrop_subtitle" />

                </LinearLayout>
            </RelativeLayout>

            <安卓.support.v7.widget.Toolbar
                安卓:id="@+id/toolbar"
                安卓:layout_width="match_parent"
                安卓:layout_height="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

        </安卓.support.design.widget.CollapsingToolbarLayout>

    </安卓.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

</安卓.support.design.widget.CoordinatorLayout>

请帮帮我

Answer 1

一,。创建一个接口

public interface ItemClickListener  {

    void onClick(View view, int position);

}

1. 然后在适配器中：

   ItemClickListener itemClickListener ;
   
   
   
   
     public void setClickListener (ItemClickListener itemClickListener){
          this.itemClickListener = itemClickListener ;
   
   }
   

   在MyViewHolder类中

     public class MyViewHolder extends RecyclerView.ViewHolder implements 
    View.OnClickListener{
       public TextView title, count;
      public ImageView thumbnail, overflow;
   
      public MyViewHolder(View view) {
       super(view);
       title = (TextView) view.findViewById(R.id.title);
       count = (TextView) view.findViewById(R.id.count);
       thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
       overflow = (ImageView) view.findViewById(R.id.overflow);
       view.setOnCLickListener(this);
       }
       @Override
   public void onClick(View v) {
       if (itemClickListener != null) itemClickListener.onClick(v, getAdapterPosition());
   
   }
   }
   

三,。在你的活动中：

implements ItemClickListener

然后可以在活动中重写OnClick（）方法

@Override
public void onClick(View view, int position) {
  // here you can get the position of the cardview and you can use switch 
 // case to go to desired activity by using startACtivity()
}

希望这对你有帮助

Answer 2

将MyViewHolder编辑为：

public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, count;
        public ImageView thumbnail, overflow;
        public View itemView;
        public MyViewHolder(View view) {
            super(view);
            itemView = view;
            title = (TextView) view.findViewById(R.id.title);
            count = (TextView) view.findViewById(R.id.count);
            thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
            overflow = (ImageView) view.findViewById(R.id.overflow);
        }
    }

onBindViewHolder：

@Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {
        Album album = albumList.get(position);
        final int pos = position;
        holder.title.setText(album.getName());
        holder.count.setText(album.getNumOfSongs() + " songs");

        // loading album cover using Glide library
        Glide.with(mContext).load(album.getThumbnail()).into(holder.thumbnail);

        holder.overflow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showPopupMenu(holder.overflow);
            }
        });
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(pos == 0){              
                   view.getContext().startActivity(new Intent(view.getContext(),Activity1.class));
               }else if(pos == 1){
                   view.getContext().startActivity(new Intent(view.getContext(),Activity2.class));
              }
            }
        });
    }