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我已經瀏覽了一系列關於如何在recyclerview佈局中放置不同寬度和高度的卡布局的文章。不幸的是，迄今沒有人幫助我。如何在RecyclerView中創建不同的CardView佈局
我已經創建了GridLayout，如下所示，但是我想創建一個顯示在主卡布局頂部的獨立卡。在這種情況下，「緊急警報卡」。
下面是我想要實現的圖像。
MY CODES：
MainActivity.java
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);
// use a GridLayout manager
mLayoutManager = new GridLayoutManager(this, 2);
mRecyclerView.setLayoutManager(mLayoutManager);
// specify an adapter
List<ItemObject> rowListItem = getAllItemList();
mAdapter = new CardViewDataAdapter(MainActivity.this, rowListItem);
mRecyclerView.setAdapter(mAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_help) {
Intent intent = new Intent(this, help_activity.class);
startActivity(intent);
finish();
return true;
} else if (id == R.id.action_about) {
Intent intent = new Intent(this, about_activity.class);
startActivity(intent);
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
//Handles the references to items displayed on each cards
private List<ItemObject> getAllItemList() {
List<ItemObject> allItems = new ArrayList<ItemObject>();
allItems.add(new ItemObject("Fire", R.drawable.fire));
allItems.add(new ItemObject("Ambulance", R.drawable.ambulance));
allItems.add(new ItemObject("Police", R.drawable.police));
allItems.add(new ItemObject("ERT", R.drawable.ert));
allItems.add(new ItemObject("Safety Tips", R.drawable.safetytips));
allItems.add(new ItemObject("First Aid", R.drawable.firstaid));
return allItems;
}
private ArrayList<Object> getSampleArrayList() {
ArrayList<Object> items = new ArrayList<>();
items.add(new ItemObject("Dany Targaryen", R.drawable.click));
return items;
}
CardViewDataAdapter.java
public class CardViewDataAdapter extends RecyclerView.Adapter<CardViewDataAdapter.ViewHolder> {
private List<ItemObject> itemList;
private static final int TYPE_IMAGE = 1;
private static final int TYPE_GROUP = 2;
public CardViewDataAdapter(Context context, List<ItemObject> itemList) {
this.itemList = itemList;
}
// Create new views (invoked by the layout manager)
@Override
public CardViewDataAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.cardview_row, null);
//Todo: set the view's size, margins, paddings and layout parameters
// create ViewHolder
ViewHolder viewHolder = new ViewHolder(itemLayoutView);
return viewHolder;
}
public class ImageViewHolder extends RecyclerView.ViewHolder {
ImageView mImage;
public ImageViewHolder(View itemView) {
super (itemView);
// init views...
}
}
@Override
public int getItemViewType(int position) {
// here your custom logic to choose the view type
return position == 0 ? TYPE_IMAGE : TYPE_GROUP;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
// - get data from your itemsData at this position
// - replace the contents of the view with that itemsData
viewHolder.image_view.setImageResource(itemList.get(position).getPhoto());
viewHolder.image_name.setText(itemList.get(position).getName());
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return this.itemList.size();
}
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
// inner class to hold a reference to each item of RecyclerView
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
// each data item is a string and an image in this case
public ImageView image_view;
public TextView image_name;
public Context context;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
this.image_view = (ImageView) itemLayoutView.findViewById(R.id.image_view);
this.image_name = (TextView) itemLayoutView.findViewById(R.id.image_name);
itemLayoutView.setOnClickListener(this);
itemLayoutView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
Toast.makeText(v.getContext(), "OnLongClick Coming soon! :" + getAdapterPosition(),
Toast.LENGTH_SHORT).show();
return true;
}
});
}