这是我的MainActivity，我使用了Recylcer View，我想在我按下RecyclerView中使用的一个封面图片时改变意图
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private AlbumsAdapter adapter;
private List<Album> albumList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.cover2).into((ImageView) findViewById(R.id.backdrop));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 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.robotics,
R.drawable.coding,
R.drawable.gaming,
R.drawable.civil,
R.drawable.electronics,
R.drawable.onspot,
R.drawable.album11};
Album a = new Album("Robotics", 4, covers[0]);
albumList.add(a);
a = new Album("Coding", 4, covers[1]);
albumList.add(a);
a = new Album("Gaming", 4, covers[2]);
albumList.add(a);
a = new Album("Civil", 2, covers[3]);
albumList.add(a);
a = new Album("Electrical", 3, covers[4]);
albumList.add(a);
a = new Album("Miscellaneous", 6, covers[5]);
albumList.add(a);
adapter.notifyDataSetChanged();
}
@Override
public void onClick(View view) {
if(view == recyclerView){
Intent i = new Intent(getApplicationContext(), SimpleTabsActivity.class);
startActivity(i);
}
}
/**
* 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()));
}
}
这是我的AdapterClass
公共类AlbumsAdapter扩展了RecyclerView.Adapter {
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() + " events");
// 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, "Go to next", Toast.LENGTH_SHORT).show();
return true;
default:
}
return false;
}
}
@Override
public int getItemCount() {
return albumList.size();
}
}
答案 0 :(得分：0)
您需要在RecyclerView上设置onclick侦听器，因此当单击卡片视图时，它将通知您选择了哪个元素。您从适配器获取该元素，并通过intent将其传递给其他活动。这是一个完整的示例代码。
Passing data to another Activity when clicking on RecyclerView。
所以基本上你需要做这三件事：
第1步您需要定义一个在RecyclerView.Adapter的{{1}}回调中夸大的布局。它需要具有这种布局结构
onCreateViewHolder 第2步：在<Some Root Layout>
<CardView
android:id="give it an id so you can refer it in your code">
</CardView>
</Some Root Layout>
中，获取具有给定ID的ViewHolder的参考。
CardView 第3步在适配器的public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView name;
public TextView phone;
public CardView card;
public ViewHolder(View itemView) {
super(view);
name = (TextView) itemView.findViewById(name_id);
phone = (TextView) itemView.findViewById(phone_id);
card = (CardView) itemView.findViewById(id of the card view);
}
}
方法中执行以下操作：
onBindViewHolder然后在 @Override
public void onBindViewHolder(ViewHolder holder, final int position) {
// get your object from your adapter at position
holder.card.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(mContext, SecondActivity.class);
intent.putExtra(SecondActivty.SELECTED_POSITION_KEY, position);
startActivity(intent);
}
});
}
的{{1}}方法中执行
SecondActivity答案 1 :(得分：0)
在onBindViewHolder AlbumsAdapter内，您可以像设置showPopupMenu一样设置点击监听器。只需在RecycleView的自定义原始xml中为您的coverflow分配一个id，并将其添加到适配器中的MyViewHolder类中。然后在onBindViewHolder内，您可以访问此视图参考并将OnClickListener设置为该参考。
holder.yourCoverFlowId.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// do your intent stuffs here
}
});