如何解决单击RecyclerView项时,显示一个新的Activity,其中包含有关该项的信息
我无法解决问题:我有RecyclerView(联系人列表)。当我单击ilem时,它应该显示一个带有有关此项目信息的新活动。我有代码,但是我不明白为什么它不起作用。也许有人可以帮助我。提前致谢。 我的适配器类:
public class ContactAdapter extends RecyclerView.Adapter<ContactAdapter.ViewHolder> {
private LayoutInflater layoutInflater;
private List<Contact> contacts;
private Context context;
public ContactAdapter(Context context,List<Contact> contacts) {
this.contacts = contacts;
this.layoutInflater = LayoutInflater.from(context);
}
@NonNull
@Override
public ContactAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
View view = layoutInflater.inflate(R.layout.list_item,parent,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ContactAdapter.ViewHolder holder,final int position) {
final Contact contact = contacts.get(position);
holder.imageView.setImageResource(contact.getImage());
holder.nameView.setText(contact.getName());
holder.numberView.setText(contact.getNumber());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(view.getContext(),SecondActivity.class);
intent.putExtra("image",contact.getImage());
intent.putExtra("name",contact.getName());
intent.putExtra("number",contact.getNumber());
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return contacts.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
final ImageView imageView;
final TextView nameView,numberView;
ViewHolder(View view) {
super(view);
imageView = view.findViewById(R.id.image);
nameView = view.findViewById(R.id.name);
numberView = view.findViewById(R.id.number);
}
}
}
我的活动课:
public class ListActivity extends AppCompatActivity {
private List<Contact> contactList = new ArrayList<>();
private RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
setInitialData();
recyclerView = findViewById(R.id.list);
ContactAdapter contactAdapter = new ContactAdapter(this,contactList);
recyclerView.setAdapter(contactAdapter);
}
private void setInitialData() {
contactList.add(new Contact(R.drawable.face,"Anna Anna","358742596814"));
contactList.add(new Contact(R.drawable.face,"Max Max","David David","James James","Lidia Lidia","Alice Alice","Mark Mark","358742596814"));
}
}
和secon活动类:
public class SecondActivity extends AppCompatActivity {
private ImageView imageView;
private TextView textName;
private TextView textNumber;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondary_activity);
Intent intent = getIntent();
String name = getIntent().getStringExtra("name");
String number = getIntent().getStringExtra("number");
imageView = findViewById(R.id.imageView);
textName = findViewById(R.id.textName);
textNumber = findViewById(R.id.textNumber);
textNumber.setText(number);
textName.setText(name);
}
}
解决方法
在这种情况下,开始其他活动不是一个好主意。看看master - detail fragment
但是,如果您确实需要启动SecondActivity,则应该这样修改您的代码:
@Override
public void onBindViewHolder(ContactAdapter.ViewHolder holder,final int position) {
final Contact contact = contacts.get(position);
holder.imageView.setImageResource(contact.getImage());
holder.nameView.setText(contact.getName());
holder.numberView.setText(contact.getNumber());
//remove holder.itemView.setOnClickListener
}
@Override
public int getItemCount() {
return contacts.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
final ImageView imageView;
final TextView nameView,numberView;
ViewHolder(View view) {
super(view);
imageView = view.findViewById(R.id.image);
nameView = view.findViewById(R.id.name);
numberView = view.findViewById(R.id.number);
//Set listener here
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final Contact contact = contacts.get(getAdapterPosition());
//Your code here
}
});
}
}
}
,
您永远不会在context
类的构造函数中初始化ContactAdapter
对象:
//the constructor
public ContactAdapter(Context context,List<Contact> contacts) {
this.contacts = contacts;
this.layoutInflater = LayoutInflater.from(context);
//add this
this.context = context;
}
此外,当您单击该项目时,请按如下所示初始化意图:
Intent intent = new Intent(context,SecondActivity.class);
代替此:
Intent intent = new Intent(view.getContext(),SecondActivity.class);
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