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！
答案 0 :(得分：0)
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));
}
}
});
}
答案 1 :(得分：0)
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。