我通过sqlite进行项目开发，并从数据库中获取银行卡清单！
我需要单击某些卡片后，在我的MainActivity中显示Relative并为此布局设置Text！
我的适配器：
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.CardViewHolder> {
private List<CardModel> cardModels;
private Context context;
public CardAdapter(Context context,List<CardModel> cardModels){
this.cardModels=cardModels;
this.context=context;
}
@NonNull
@Override
public CardViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.cardbank_row,parent,false);
return new CardViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull CardViewHolder holder, final int position) {
CardModel cardModeles=cardModels.get(position);
holder.bank.setText(cardModeles.getBank());
holder.cardname.setText(cardModeles.getCardname());
holder.cardnumber.setText(cardModeles.getCardnumber());
holder.card.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
@Override
public int getItemCount() {
return cardModels.size();
}
public class CardViewHolder extends RecyclerView.ViewHolder {
TextView bank,cardnumber,cardname;
ImageView bicon;
CardView card;
public CardViewHolder(@NonNull View itemView) {
super(itemView);
card=itemView.findViewById(R.id.cardbank_row);
bicon=itemView.findViewById(R.id.iv_row_banklogo);
bank=itemView.findViewById(R.id.iv_row_bankname);
cardnumber=itemView.findViewById(R.id.tv_row_cardnumber);
cardname=itemView.findViewById(R.id.tv_row_cardname);
}
}
我的mainActivity：
public class MainActivity extends AppCompatActivity {
RelativeLayout add,close,card;
ImageView copy,share,notification;
TextView cardbank,cardnumber,cardname;
CoordinatorLayout coordinatorLayout;
private static final int TIME_INTERVAL = 2000;
private long mBackPressed;
MyDatabase myDatabase;
RecyclerView recyclerView;
private List<CardModel> cardModelList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cast();
dbcast();
onClick();
}
public void cast(){
add=findViewById(R.id.rv_btns_add);
close=findViewById(R.id.rv_bank_close);
copy=findViewById(R.id.iv_btn_copy);
share=findViewById(R.id.iv_btn_share);
notification=findViewById(R.id.iv_toolbar_notofication);
coordinatorLayout=findViewById(R.id.mysnakbar);
card=findViewById(R.id.rv_card_card);
cardbank=findViewById(R.id.tv_bank_bankname);
cardnumber=findViewById(R.id.tv_bnumber_cardnumber);
cardname=findViewById(R.id.tv_name_cardname);
cardModelList=new ArrayList<>();
recyclerView=findViewById(R.id.rv_footer_list);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this,RecyclerView.VERTICAL,false));
}
public void dbcast(){
myDatabase=new MyDatabase(getApplicationContext());
Cursor cursor=myDatabase.getInfos();
for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()){
CardModel cardModel=new CardModel();
cardModel.setId(cursor.getInt(0));
cardModel.setBank(cursor.getString(1));
cardModel.setCardnumber(cursor.getString(2));
cardModel.setCardname(cursor.getString(3));
cardModelList.add(cardModel);
}
recyclerView.setAdapter(new CardAdapter(MainActivity.this,cardModelList));
}
查看图片了解 demo what do i want
答案 0 :(得分：0)
您可以通过将接口传递给适配器来实现。
public interface RecyclerCallback {
void onClick(int pos);
}
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.CardViewHolder> {
private List<CardModel> cardModels;
private Context context;
private RecyclerCallback callback;
public CardAdapter(Context context,List<CardModel> cardModels, RecyclerCallback callback){
this.cardModels=cardModels;
this.context=context;
this.callback = callback;
}
@NonNull
@Override
public CardViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.cardbank_row,parent,false);
return new CardViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull CardViewHolder holder, final int position) {
CardModel cardModeles=cardModels.get(position);
holder.bank.setText(cardModeles.getBank());
holder.cardname.setText(cardModeles.getCardname());
holder.cardnumber.setText(cardModeles.getCardnumber());
holder.card.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
callback.onClick(position); // or you can pass CardModel
}
});
}
@Override
public int getItemCount() {
return cardModels.size();
}
public class MainActivity extends AppCompatActivity implements RecyclerCallback {
RelativeLayout add,close,card;
ImageView copy,share,notification;
TextView cardbank,cardnumber,cardname;
CoordinatorLayout coordinatorLayout;
private static final int TIME_INTERVAL = 2000;
private long mBackPressed;
MyDatabase myDatabase;
RecyclerView recyclerView;
private List<CardModel> cardModelList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cast();
dbcast();
onClick();
}
public void cast(){
add=findViewById(R.id.rv_btns_add);
close=findViewById(R.id.rv_bank_close);
copy=findViewById(R.id.iv_btn_copy);
share=findViewById(R.id.iv_btn_share);
notification=findViewById(R.id.iv_toolbar_notofication);
coordinatorLayout=findViewById(R.id.mysnakbar);
card=findViewById(R.id.rv_card_card);
cardbank=findViewById(R.id.tv_bank_bankname);
cardnumber=findViewById(R.id.tv_bnumber_cardnumber);
cardname=findViewById(R.id.tv_name_cardname);
cardModelList=new ArrayList<>();
recyclerView=findViewById(R.id.rv_footer_list);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this,RecyclerView.VERTICAL,false));
}
public void dbcast(){
myDatabase=new MyDatabase(getApplicationContext());
Cursor cursor=myDatabase.getInfos();
for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()){
CardModel cardModel=new CardModel();
cardModel.setId(cursor.getInt(0));
cardModel.setBank(cursor.getString(1));
cardModel.setCardnumber(cursor.getString(2));
cardModel.setCardname(cursor.getString(3));
cardModelList.add(cardModel);
}
recyclerView.setAdapter(new CardAdapter(MainActivity.this,cardModelList, this));
}
@Override
onClick(int pos){
CardModel model = cardModelList.get(pos);
// write code to show data in relative layout
}
}