我有一个recyclerview，通过选择单选按钮，可以打开一个带有选项的Alertdialog。我的问题是获取所选行（单选按钮）在recyclerview中的位置，因此我可以用它从firebase读取并将其传递给alertdialog。
我的单选按钮onclick方法用于RecyclerView.ViewHolder类。这是我要获取所选单选按钮的位置的地方。
我已经阅读了上面的链接，因为从总体上来说我是recyclerview和android的新手，所以上面的链接中的解决方案使我感到困惑，这确实令人头疼，他们尝试了大多数解决方案，但仍然找不到我的解决方案< / p>
主要活动
public class Review2 extends AppCompatActivity {
private TextView impres, impress1, impress2,impress3,impress4,impress5;
private RecyclerView patient_drug_list;
private FirebaseAuth mAuth;
private DatabaseReference mDrugList, mNameDiag, mName;
private TextView desker, name, dater;
public String drug, dosing;
FirebaseRecyclerAdapter<Drugs, DrugsViewHolder> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_review2);
///Firebase Authentication and related properties
mAuth = FirebaseAuth.getInstance();
FirebaseUser mUser = mAuth.getCurrentUser();
String uId = mUser.getUid();/// id or users
desker = findViewById(R.id.desk);
String user_id = getIntent().getStringExtra(Review1.REVIEW_ID);///retrieve value from activity
///Toast.makeText(this, user_id, Toast.LENGTH_LONG).show();///verify if value is gotten
Query query = FirebaseDatabase.getInstance().getReference().child("Drugs").child(uId).child(user_id);
query.keepSynced(true);
patient_drug_list = (RecyclerView) findViewById(R.id.recycler2); ////Recycler view from xml
patient_drug_list.setLayoutManager(new LinearLayoutManager(this));
patient_drug_list.setHasFixedSize(true);
///////////////////////////Assign Items
impres = findViewById(R.id.diagnose1);
impress1 = findViewById(R.id.diagnose2);
impress2 = findViewById(R.id.diagnose3);
impress3 = findViewById(R.id.diagnose4);
impress4 = findViewById(R.id.diagnose5);
impress5 = findViewById(R.id.diagnose6);
name = findViewById(R.id.RName);
dater = findViewById(R.id.RDate);
/////////////Reading firebase data
mNameDiag = FirebaseDatabase.getInstance().getReference().child("Diagnosis").child(uId).child(user_id);
mNameDiag.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String diagnosis1 = dataSnapshot.child("diagnosis1").getValue().toString();
String diagnosis2 = dataSnapshot.child("diagnosis2").getValue().toString();
String diagnosis3 = dataSnapshot.child("diagnosis3").getValue().toString();
String diagnosis4 = dataSnapshot.child("diagnosis4").getValue().toString();
String diagnosis5 = dataSnapshot.child("diagnosis5").getValue().toString();
impres.setText(diagnosis1);
impress1.setText(diagnosis2);
impress2.setText(diagnosis3);
impress3.setText(diagnosis4);
impress4.setText(diagnosis5);
impress5.setText(diagnosis5);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
/////////////////////////////////////////////////////////////////
mName = FirebaseDatabase.getInstance().getReference().child("Patients").child(uId).child(user_id);
mName.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String namer = dataSnapshot.child("name").getValue().toString();
String dater1 = dataSnapshot.child("date").getValue().toString();
name.setText(namer);
dater.setText(dater1);
adapter.startListening();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
////Firebase Adapter and related properties
FirebaseRecyclerOptions<Drugs> options = new FirebaseRecyclerOptions.Builder<Drugs>()
.setQuery(query, Drugs.class).build();
adapter = new FirebaseRecyclerAdapter<Drugs, DrugsViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull DrugsViewHolder holder, final int position, @NonNull Drugs model) {
holder.setDiag1(model.getBrand());
holder.setDiag2(model.getGeneric());
holder.setDiag3(model.getDose());
holder.setDiag4(model.getFrequency1(), model.getFrequency2(), model.getDuration());
}
@NonNull
@Override
public DrugsViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
////Recycler view item
View view = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.drug_display_list,viewGroup,false);///
return new DrugsViewHolder(view);
}
};
patient_drug_list.setLayoutManager(new LinearLayoutManager(this));
patient_drug_list.setAdapter(adapter);//// setting adapter
adapter.notifyDataSetChanged();
adapter.startListening();
}
@Override
protected void onStart() {
super.onStart();
adapter.startListening();
adapter.notifyDataSetChanged();
}
////////////////click for new option activities
//This is a switch for the adio button options that appear after the above radiobutton
public void clickers(View view) {
switch (view.getId()){
case R.id.drug_needed:
startActivity(new Intent(getApplicationContext(),Drug_needed.class));
break;
case R.id.wrong_drug:
Toast.makeText(Review2.this, "2nd", Toast.LENGTH_SHORT).show();
break;
case R.id.dose_related:
startActivity(new Intent(getApplicationContext(),Dose.class));
break;
case R.id.adverse_reaction:
startActivity(new Intent(getApplicationContext(),ADR.class));
break;
case R.id.food_interaction:
Toast.makeText(this, "yet to do", Toast.LENGTH_SHORT).show();
break;
default:
Toast.makeText(Review2.this, "nothing to see", Toast.LENGTH_SHORT).show();
break;
}
}
////////////////View Holder
private class DrugsViewHolder extends RecyclerView.ViewHolder{
View mView;
DrugsViewHolder(@NonNull View itemView) {
super(itemView);
mView = itemView;
final RadioButton radioButton = mView.findViewById(R.id.not_appropriate);
radioButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final int position1 = getAdapterPosition();
AlertDialog.Builder myDialog = new AlertDialog.Builder(Review2.this);
LayoutInflater inflater = LayoutInflater.from(Review2.this);
View myview = inflater.inflate(R.layout.adr_options, null);
myDialog.setView(myview);
myDialog.show();
}
});
}
void setDiag1(String diag1){
TextView postdiag1 = mView.findViewById(R.id.brand);
postdiag1.setText(diag1);
}
void setDiag2(String diag2){
TextView postdiag2 = mView.findViewById(R.id.generic);
postdiag2.setText(diag2);
postdiag2.setTextSize(12);
}
public void setDiag3(String diag3){
TextView postdiag3 = mView.findViewById(R.id.dose);
postdiag3.setText("Dose:" + diag3);
}
public void setDiag4(String diag4, String diag5, String diag6){
TextView postdiag4 = mView.findViewById(R.id.frequency);
postdiag4.setText("Frequency:" + diag4 + " tab " + diag5+"x" + "daily for "+diag6 + "days");
}
}
}
因此，为了简单起见，我只希望能够从RecyclerView.ViewHolder类中使用选定的单选按钮获取recyclerview行的位置。任何建议，想法或示例都将不胜感激。
答案 0 :(得分：1)
我怎么看：
selectedRowPosition或selectedRowsPositions字段； selectedRowPosition； selectedRowPosition字段。当您看到上述策略时，我已经创建了repository。最重要的类是适配器：
public class RadioButtonsAdapter extends RecyclerView.Adapter<RadioButtonsAdapter.RadioViewHolder> {
// Field when we store position of last clicked item
private int lastClickedItemPosition;
@NonNull
@Override
public RadioViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
RadioButton button = new RadioButton(parent.getContext());
return new RadioViewHolder(button);
}
@Override
public void onBindViewHolder(@NonNull RadioViewHolder holder, int position) {
holder.radioButton.setText("It is button #" + position);
}
@Override
public int getItemCount() {
return 30;
}
// Use this method to get lastClickedItemPosition
public int getLastClickedItemPosition() {
return lastClickedItemPosition;
}
// This is inner class. From this class you can change 'lastClickedItemPosition' field of adapter
class RadioViewHolder extends RecyclerView.ViewHolder {
private RadioButton radioButton;
public RadioViewHolder(@NonNull View itemView) {
super(itemView);
radioButton = (RadioButton) itemView;
radioButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
lastClickedItemPosition = getAdapterPosition();
}
});
}
}
}
您可以致电adapter.getLastClickedItemPosition()获取上次单击的项目的位置。 MainActivty的完整代码在github上。 MainActivity是用Kotlin写的，但是不用担心，它很容易理解。
我不建议您在RadioButton中使用RecyclerView。 RadioButton的常用用法是在RadioGroup内部。选中this link以了解有关RadioButton用法的更多详细信息。