我的项目有 recyclerview。我想获取项目 id 。如何获取商品 ID？ .我使用了 Item touchhelper 并且我需要特定的 item id 。我怎样才能获得特定的项目 ID。
Activty.java
public class todoactivity extends AppCompatActivity {
TextView title;
Button back;
ImageButton gorevo;
RecyclerView recyclerView;
List<String>Listsx = new ArrayList<>();
TodoActivityAdpter adapterx;
DatabaseHelper4 myDBxxx;
TextView textView;
CheckBox checkBox;
long id;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_todoactivity);
recyclerView=findViewById(R.id.recyclerviewxx);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
adapterx=new TodoActivityAdpter(Listsx);
recyclerView.setAdapter(adapterx);
title=findViewById(R.id.titlex);
textView=findViewById(R.id.text_viewx);
gorevo = findViewById(R.id.gorevo);
myDBxxx = new DatabaseHelper4(this);
Cursor datax = myDBxxx.getListContents();
if(datax.getCount() == 0){
}else{
while(datax.moveToNext()){
Listsx.add(datax.getString(1));
ListAdapter listAdapterx = new ArrayAdapter<>(this,R.layout.todoactivity_item,R.id.textitem,Listsx);
adapterx.notifyItemInserted(Listsx.size()-1);
}
}
gorevo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
BottomSheetDialog bottomSheetDialog = new BottomSheetDialog(todoactivity.this);
bottomSheetDialog.setContentView(R.layout.bottomsheetlayout3);
bottomSheetDialog.show();
InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED,0);
EditText editText = bottomSheetDialog.findViewById(R.id.editx);
Button ekle = bottomSheetDialog.findViewById(R.id.ekle);
ekle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String text = editText.getText().toString();
Listsx.add(text);
AddDataxxx(text);
adapterx.notifyItemInserted(Listsx.size()-1);
bottomSheetDialog.hide();
inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(),0);
}
});
}
});
back=findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(todoactivity.this, pomodoroscreen.class);
startActivity(i);
overridePendingTransition(0,0);
}
});
ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT) {
@Override
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
int positionx = viewHolder.getAdapterPosition();
Listsx.remove(positionx);
adapterx.notifyItemRemoved(positionx);
myDBxxx.deleteItem(// I want get id in there);
}
};
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
}
public void AddDataxxx(String newEntry) {
boolean insertDatax = myDBxxx.addDataxxx(newEntry);
}
}
MyAdapter.java
public class TodoActivityAdpter extends RecyclerView.Adapter<TodoActivityAdpter.Holder> {
List<String>Listsx;
public TodoActivityAdpter(List<String>itemxxx){
this.Listsx = itemxxx;
}
@NonNull
@Override
public TodoActivityAdpter.Holder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.todoactivity_item,parent,false);
Holder holder = new Holder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull TodoActivityAdpter.Holder holder, int position) {
holder.textView.setText(Listsx.get(position));
holder.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (holder.checkBox.isChecked()) {
holder.textView.setTextColor(view.getResources().getColor(R.color.grey));
} else {
holder.textView.setTextColor(view.getResources().getColor(R.color.Color_black));
}
}
});
}
@Override
public int getItemCount() {
return Listsx.size();
}
public class Holder extends RecyclerView.ViewHolder {
CheckBox checkBox;
TextView textView;
List<String>Listsx;
RecyclerView recyclerView;
Context mContext;
public Holder(View view) {
super(view);
textView=view.findViewById(R.id.text_viewx);
checkBox=view.findViewById(R.id.checkbox);
recyclerView=view.findViewById(R.id.recyclerviewxx);
}
}
}
我想在 Activty 中获取项目 ID。我怎样才能得到项目 id 。你能不能快点。我的活动是 activity.java 。我的适配器是 MyAdapter.java
答案 0 :(得分：0)
import android.content.Context
import android.text.Editable
import android.text.TextWatcher
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.list_item_view.view.*
class CustomAdapter(private val data : DataClass, private val context : Context) :
RecyclerView.Adapter<CustomAdapter.ViewHolder>() {
init {
setHasStableIds(true)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val rowItem: View = LayoutInflater.from(context).inflate(R.layout.list_item_view, parent, false)
return ViewHolder(rowItem)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.itemView.tv1.setText(data.list3[position])
holder.itemView.et1.setText(data.list1[position])
holder.itemView.et2.setText(data.list2[position])
holder.itemView.et1.addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(p0: Editable?) {
data.list1[position]= holder.itemView.et1.text.toString()
// activity.fonction()
}
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
}
})
holder.itemView.et2.addTextChangedListener(object : TextWatcher {
override fun afterTextChanged(p0: Editable?) {
data.list2[position] = holder.itemView.et2.text.toString()
//this is instead of `fonction2()`
holder.itemView.tv2.text = "?????"
//fonction2()
fonction3(position)
}
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
}
})
}
override fun getItemId(position: Int): Long {
return position.toLong()
}
override fun getItemCount(): Int {
return data.list1.size
}
inner class ViewHolder(rowItem: View) : RecyclerView.ViewHolder(rowItem) {
}
fun fonction3(position: Int) {
if (position in 1..98) {
data.list3[position] = (0.5 * (data.list2[position - 1].toDouble() + data.list2[position + 1].toDouble())).toString()
//activity.Update()
}
}
}
也许
答案 1 :(得分：0)
您将获得 Activity Adapter 中的每个数据项。
首先用一种方法创建一个接口，如下所示：
public interface OnClick {
public void clicked(View v, int position, int id);
}
在您的活动中实现此接口。喜欢：
public class YourActivity implement onClick{
}
当你在你的活动中实现接口时，它会询问方法然后在你的活动中添加点击的方法。
现在将其添加到您的适配器中
public TodoActivityAdpter(List<String>itemxxx,OnClick onClick){
this.Listsx = itemxxx;
this.onClick=onClick;
}
像这样从 Adapter 传递这个对象：
adapterx=new TodoActivityAdpter(Listsx,this);
现在在您的 clicked() 中您将获得适配器传递的数据
但是您只将一个字符串传递给您的适配器，因此只会得到这个。