当我编辑一个项目时，它会更改recycleview中的所有项目，并且不会刷新[view？]事件。我不知道该怎么办。我认为问题可能在于，根据表中更新语句中的项目位置，它没有获得行ID。怎么了？
以下是详细信息：
public class RecyclerUser extends
RecyclerView.Adapter<RecyclerUser.RecyclerViewHolderz> {
Context context;
LayoutInflater inflater;
private List<String> users_names_list;
UsuariosModel usertModel;
String batch_name;
ArrayList<UsuariosModel> student_list;
private ArrayList<Object> arrayList = new ArrayList<>();
List<String> student_names;
List<String> user_id_list;
private MyDatabase mDatabase;
public RecyclerUser(Context context, List<String> users_names_list) {
this.context = context;
inflater = LayoutInflater.from(context);
this.users_names_list = users_names_list;
student_list = new ArrayList<UsuariosModel>();
mDatabase = new MyDatabase(context);
this.notifyDataSetChanged();
this. modifyItem();
}
@Override
public RecyclerViewHolderz onCreateViewHolder(ViewGroup parent, int viewType) {
View v = inflater.inflate(R.layout.item_list, parent, false);
RecyclerViewHolderz viewHolders = new RecyclerViewHolderz(v);
if (student_list == null) {
} else {
for (int i = 0; i < student_list.size(); i++) {
student_names.add(student_list.get(i).getusuarios_name());
user_id_list.add(student_list.get(i).getnumero_name());
}
}
return viewHolders;
}
@Override
public void onBindViewHolder(final RecyclerViewHolderz holder,final int position) {
final String bakery = this.users_names_list.get(position);
holder.tv1.setTag(position);
holder.tv1.setText((CharSequence) users_names_list.get(position));
holder.tv1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Add new Student and its UserId");
LinearLayout layout = new LinearLayout((context));
layout.setOrientation(LinearLayout.VERTICAL);
// Set up the input
final EditText user_name = new EditText(context);
// Specify the type of input expected; this, for example, sets the input as a password, and will mask the text
user_name.setInputType(InputType.TYPE_CLASS_TEXT);
user_name.setHint("User Name");
layout.addView(user_name);
final EditText user_id = new EditText(context);
// Specify the type of input expected; this, for example, sets the input as a password, and will mask the text
user_id.setInputType(InputType.TYPE_CLASS_TEXT);
user_id.setHint("User Id");
layout.addView(user_id);
builder.setView(layout);
// Set up the buttons
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
usertModel = new UsuariosModel(position,user_name.getText().toString(), user_id.getText().toString(), batch_name);
final SQLiteDatabase db = MyDatabase.getInstance(context).getWritableDatabase();
UserTable.updateItem(db,usertModel);
db.close();
//refresh the activity
((Tab_system)context).finish();
context.startActivity(((Tab_system)context).getIntent());
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
Toast.makeText(context, holder.tv1.getText().toString() + "\nhola cabezon" + position, Toast.LENGTH_SHORT).show();
}
});
holder.tv1.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
final android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(context);
builder.setTitle("Delete");
builder.setMessage("Are you sure you want to delete it?");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
users_names_list.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, users_names_list.size());
final SQLiteDatabase db = MyDatabase.getInstance(context).getWritableDatabase();
UserTable.deleteByStudentName(db, holder.tv1.getText().toString());
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
return true;
}
});
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
View.OnClickListener clickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
RecyclerViewHolderz hola = (RecyclerViewHolderz) v.getTag();
int position = hola.getPosition();
Toast.makeText(context, "This is position " + position, Toast.LENGTH_LONG).show();
}
};
@Override
public int getItemCount() {
return users_names_list.size();
}
public void notifyDatasetChanged(List<String> newbowlerlist) {
student_names.clear();
student_names.addAll(newbowlerlist);
super.notifyDataSetChanged();
}
public void modifyItem() {
notifyDataSetChanged();
}
private void notifyDataSetChanged(int position) {
notifyDataSetChanged();
}
public class RecyclerViewHolderz extends RecyclerView.ViewHolder {
TextView tv1;
ImageView imageView;
public RecyclerViewHolderz(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.list_avatar);
tv1 = (TextView) itemView.findViewById(R.id.student_name_text_view);
}
}
}
更新声明
public static long updateItem(SQLiteDatabase db, UsuariosModel usuarios) {
ContentValues contentValues = new ContentValues();
contentValues.put("Usuario_name", usuarios.getusuarios_name());
long ver = db.update(
TABLE_NAME,
contentValues,
ID,
null);
return ver;
}
这是结果的screenshot！ 请帮助
