Question

我很难搞清楚这个。我正在创建一个Android应用程序，用户（登录后）在回收站视图中看到带有cardview列表的活动。

我希望用户能够点击卡片并转到其他活动。如果你点击卡1，你必须去参加游戏1的活动。如果你点击卡2，你必须去参加游戏2的活动。等等...

这是我的＆＃34;主要＆＃34;登录后的活动：

public int i=0;
    public Polygon polygon;
    public Polyline polyline;

    List<LatLng> coordinates=new ArrayList<LatLng>();
   public void onMapClick(LatLng point) {
       mTapTextView.setText("tapped, point=" + point);
       if (i==0){
           i=1;
           coordinates.add(point);
           googleMap.addMarker(new MarkerOptions()
                   .position(point)
                   .title(String.valueOf(point.latitude))
                   .snippet(String.valueOf(point.latitude))
                   .rotation((float) -15.0)
                   .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE))
           );
       } else if (i==1) {
           i=i+1;
           coordinates.add(point);
           polyline = googleMap.addPolyline((new PolylineOptions())
                   .add(coordinates.get(0), coordinates.get(1)));
       }else if (i>1){
           coordinates.add(point);
           polyline.remove();
           if (i>2){polygon.remove();};
           polygon = googleMap.addPolygon(new PolygonOptions()
               .addAll(coordinates)
            .strokeColor(Color.BLACK)
             .strokeWidth(10));
           //polygon = googleMap.addPolygon((new PolygonOptions())
              //     .add(coordinates.get(0), coordinates.get(1),coordinates.get(2)));
           i=i+1;
       }/*else{
           List<LatLng> polygonList = polygon.getPoints();

           Toast.makeText(getBaseContext(), polygonList.toString(), Toast.LENGTH_LONG).show();


           polygonList.add(point);
           polygon.remove();
           polygon = googleMap.addPolygon((new PolygonOptions()));
           polygon.setPoints(polygonList);
           i=i+1;
       }*/
   }

这是我的适配器：

package com.afmob.gaming;

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

这就是个人卡的样子：

package com.afmob.gaming;

import android.content.Context;
import android.support.v7.widget.PopupMenu;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.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();
    }
}

这就是recyclerview的样子：

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

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

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

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

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

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

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

        </RelativeLayout>

    </android.support.v7.widget.CardView>

</LinearLayout>

这是主要观点：

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

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

</RelativeLayout>

请帮助我！

Answer 1

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));
              }
            }
        });
    }

Answer 2

1.创建一个界面

public interface ItemClickListener  {

    void onClick(View view, int position);

}

然后在你的适配器中：

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());

}
}

3.在您的活动中：

implements ItemClickListener

然后您可以覆盖活动中的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()
}

希望这会对你有所帮助。

Android Cardview点击不同的活动

2 个答案: