public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.CustomViewHolder> {
ArrayList<Member> members;
Context mContext;
public class CustomViewHolder extends RecyclerView.ViewHolder {
// adapter의 viewHolder에 대한 inner class (setContent()와 비슷한 역할)
// itemView를 저장하는 custom viewHolder 생성
// findViewById & 각종 event 작업
TextView tvName, tvAge, tvJob;
public CustomViewHolder(@NonNull View itemView) {
super(itemView);
// item 에 대한 클릭 이벤트 설정
tvName = itemView.findViewById(R.id.item_name);
tvAge = itemView.findViewById(R.id.item_age);
tvJob = itemView.findViewById(R.id.item_job);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
Intent intent = new Intent(mContext, EditActivity.class);
intent.putExtra("name", members.get(position).getName());
intent.putExtra("age", members.get(position).getAge());
intent.putExtra("job", members.get(position).getJob());
intent.putExtra("position", position);
mContext.startActivity(intent);
}
}
});
}
}
2. EditActivity 생성
public class EditActivity extends AppCompatActivity {
EditText edtName, edtAge, edtJob;
Button btnSubmit;
String name, job;
int age;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item);
edtName = findViewById(R.id.edt_name);
edtAge = findViewById(R.id.edt_age);
edtJob = findViewById(R.id.edt_job);
name = getIntent().getStringExtra("name");
job = getIntent().getStringExtra("job");
age = getIntent().getIntExtra("age", -1);
edtName.setText(name);
edtAge.setText(String.valueOf(age));
edtJob.setText(job);
btnSubmit = findViewById(R.id.btn_submit);
btnSubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
name = edtName.getText().toString();
job = edtJob.getText().toString();
age = Integer.parseInt(edtAge.getText().toString());
if (name.length() > 0 && job.length() > 0 && age > 0) {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
intent.putExtra("edit", true);
intent.putExtra("name", name);
intent.putExtra("age", age);
intent.putExtra("job", job);
intent.putExtra("position", getIntent().getIntExtra("position", -1));
startActivity(intent);
finish();
}
}
});
}
}
3. MainActivity 코드 추가
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
}
@Override
protected void onStart() {
super.onStart();
int action = 0;
if (getIntent().getBooleanExtra("new", false)) action = 1;
else if (getIntent().getBooleanExtra("edit", false)) action = 2;
Log.d(TAG, "onStart: " + action);
if (action > 0) {
String name, job;
int age;
name = getIntent().getStringExtra("name");
job = getIntent().getStringExtra("job");
age = getIntent().getIntExtra("age", -1);
if (action == 1) members.add(new Member(name, age, job));
else { // when action == 2
int position = getIntent().getIntExtra("position", -1);
if (position != -1) {
members.get(position).setName(name);
members.get(position).setAge(age);
members.get(position).setJob(job);
}
}
adapter.notifyDataSetChanged();
}
}
[결과 화면]
아이템 수정
아이템 삭제하기
동작:
아이템 롱클릭 시 삭제하겠냐는 다이얼로그가 나타난다.
삭제하기를 선택하면 해당 아이템이 삭제된다.
1. 어댑터 롱클릭 이벤트 추가
public class CustomViewHolder extends RecyclerView.ViewHolder {
...
public CustomViewHolder(@NonNull View itemView) {
super(itemView);
...
itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle("삭제하기")
.setMessage(members.get(position).getName() + "을(를) 삭제하시겠습니까?")
.setPositiveButton("삭제하기", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
members.remove(position);
notifyDataSetChanged();
}
})
.setNeutralButton("취소", null)
.show();
}
return false;
}
});
}
}
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