英文:
on back pressed I want to go previous activity from adapter
问题
public class TestFragment extends Fragment {
// ... (rest of the code)
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_test, container, false);
// ... (rest of the code)
btnPrev.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
displayPrevQues();
}
});
btnSubmit.setOnClickListener(new View.OnClickListener() {
@SuppressLint("SetTextI18n")
@Override
public void onClick(View v) {
for (int i = 0; i < totalItem; i++) {
if (quesList.get(i).getSelAnswer().equals("none")) {
allAnswered = false;
score++;
break;
} else {
if (quesList.get(i).getSelAnswer().equals(quesList.get(i).getAnswer())) {
score++;
}
allAnswered = true;
}
}
if (allAnswered) {
Intent intent = new Intent(getContext(), finalresult.class);
intent.putExtra("score", score);
intent.putExtra("questions", totalItem);
startActivity(intent);
} else {
Toast.makeText(getContext(), "Answer all the questions", Toast.LENGTH_SHORT).show();
}
}
});
return view;
}
// ... (rest of the code)
}
public class QuestionLayoutRecyclerAdapter extends RecyclerView.Adapter<QuestionLayoutRecyclerAdapter.FlagViewHolder> {
// ... (rest of the code)
@NonNull
@Override
public FlagViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.question_layout, parent, false);
FlagViewHolder flagViewHolder = new FlagViewHolder(view, quesList);
return flagViewHolder;
}
@SuppressLint("ResourceAsColor")
@Override
public void onBindViewHolder(@NonNull final FlagViewHolder holder, int position) {
mcqQuestion question_id = quesList.get(position);
holder.tvQuestionNumber.setText("Question " + (position + 1));
if (question_id.isFlag()) {
holder.ivFlag.setImageResource(R.drawable.right2);
} else {
holder.ivFlag.setImageResource(R.drawable.white2);
}
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onItemClickListner.onClick(holder.getAdapterPosition());
}
});
}
// ... (rest of the code)
}
Please note that I have made necessary changes in the code snippets to make them syntactically correct and relevant to your requirements.
英文:
I have an activity which is connected with an adapter. In the activity, I include adapter layout. when I click on the button than adapter layout open but when I press back button in adapter layout than automatically reached main activity. I want that when I press back button in adapter than go to previous activity.
activity code is below
public class TestFragment extends Fragment {
private Button btnA,
btnB,
btnC,
btnD,
btnSubmit,
btnNext,
btnPrev,
btnFlag;
private TextView tvQuestion,
tvLayout;
private int totalItem;
private int listItem = 0;
private ArrayList < mcqQuestion > quesList = new ArrayList < >();
private int score = 0;
private boolean isLoading = true;
private RelativeLayout rlMcqProgress;
private FirebaseAuth mAuth;
private boolean allAnswered = false;
private RecyclerView rvQuesLayout;
private RecyclerView.LayoutManager layoutManager;
private QuestionLayoutRecyclerAdapter adapter;
private LinearLayout llQuestionAll;
private FirebaseDatabase database = FirebaseDatabase.getInstance();
private DatabaseReference myRef = database.getReference("tax").child("Questions");
public TestFragment() {
// Required empty public constructor
}@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_test, container, false);
btnA = view.findViewById(R.id.btn_mcq_A);
btnB = view.findViewById(R.id.btn_mcq_B);
btnC = view.findViewById(R.id.btn_mcq_C);
btnD = view.findViewById(R.id.btn_mcq_D);
btnSubmit = view.findViewById(R.id.btn_mcq_submit);
btnNext = view.findViewById(R.id.btn_mcq_next);
btnPrev = view.findViewById(R.id.btn_mcq_prev);
btnFlag = view.findViewById(R.id.btn_mcq_flag);
tvQuestion = view.findViewById(R.id.tv_mcq_question);
tvLayout = view.findViewById(R.id.tv_mcq_question_layout);
rvQuesLayout = view.findViewById(R.id.rv_layout_question_test);
rlMcqProgress = view.findViewById(R.id.rl_mcq_progress);
rlMcqProgress.setVisibility(View.VISIBLE);
llQuestionAll = view.findViewById(R.id.ll_test_all);
mAuth = FirebaseAuth.getInstance();
getFData();
btnA.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
quesList.get(listItem).setSelAnswer("optA");
setButtonColor();
btnA.setBackgroundResource(R.color.sky_blue);
}
});
btnB.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
quesList.get(listItem).setSelAnswer("optB");
setButtonColor();
btnB.setBackgroundResource(R.color.sky_blue);
}
});
btnC.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
quesList.get(listItem).setSelAnswer("optC");
setButtonColor();
btnC.setBackgroundResource(R.color.sky_blue);
}
});
btnD.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
quesList.get(listItem).setSelAnswer("optD");
setButtonColor();
btnD.setBackgroundResource(R.color.sky_blue);
}
});
btnFlag.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
setFlagValue();
setFlagColor();
}
});
tvLayout.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
adapter.notifyDataSetChanged();
if (rvQuesLayout.getVisibility() == View.GONE || rvQuesLayout.getVisibility() == View.INVISIBLE) {
rvQuesLayout.setVisibility(View.VISIBLE);
llQuestionAll.setVisibility(View.GONE);
} else {
rvQuesLayout.setVisibility(View.GONE);
llQuestionAll.setVisibility(View.VISIBLE);
}
}
});
btnNext.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
displayNextQues();
}
});
btnPrev.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
displayPrevQues();
}
});
btnSubmit.setOnClickListener(new View.OnClickListener() {@SuppressLint("SetTextI18n")@Override
public void onClick(View v) {
for (int i = 0; i < totalItem; i++) {
if (quesList.get(i).getSelAnswer().equals("none")) {
allAnswered = false;
score++;
break;
} else {
if (quesList.get(i).getSelAnswer().equals(quesList.get(i).getAnswer())) {
score++;
}
allAnswered = true;
}
}
if (allAnswered) {
Intent intent = new Intent(this, finalresult.class);
intent.putExtra("score", score);
intent.putExtra("questions", totalItem);
startActivity(intent);
} else {
Toast.makeText(this, "Answer all the questions", Toast.LENGTH_SHORT).show();
}
}
});
return view;
}
private void makeRecyclerView() {
layoutManager = new LinearLayoutManager(this);
//rvQuesLayout.setHasFixedSize(true);
rvQuesLayout.setLayoutManager(layoutManager);
adapter = new QuestionLayoutRecyclerAdapter(quesList);
rvQuesLayout.setAdapter(adapter);
adapter.setOnItemClickListner(new QuestionLayoutRecyclerAdapter.onItemClickListner() {@Override
public void onClick(int pos) {
listItem = pos;
if (listItem >= 0 && listItem < totalItem) {
makeAllDisplay();
rvQuesLayout.setVisibility(View.GONE);
llQuestionAll.setVisibility(View.VISIBLE);
}
}
});
}
private void setDisplay(int item) {
btnA.setText(quesList.get(item).getOptA());
btnB.setText(quesList.get(item).getOptB());
btnC.setText(quesList.get(item).getOptC());
btnD.setText(quesList.get(item).getOptD());
tvQuestion.setText(quesList.get(item).getQuestion());
}
private void getFData() {
myRef.addValueEventListener(new ValueEventListener() {@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot messageSnapshot: dataSnapshot.getChildren()) {
String qtext = (String) messageSnapshot.child("qText").getValue();
String optA = (String) messageSnapshot.child("optA").getValue();
String optB = (String) messageSnapshot.child("optB").getValue();
String optC = (String) messageSnapshot.child("optC").getValue();
String optD = (String) messageSnapshot.child("optD").getValue();
String answer = (String) messageSnapshot.child("answer").getValue();
quesList.add(new mcqQuestion(qtext, optA, optB, optC, optD, answer, "none", false));
Log.d("TOTAL ITEM", String.valueOf(quesList.size()));
}
totalItem = quesList.size();
isLoading = false;
if (!isLoading) {
setDisplay(listItem);
rlMcqProgress.setVisibility(View.GONE);
tvLayout.setVisibility(View.VISIBLE);
}
makeRecyclerView();
}@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void setFlagValue() {
if (quesList.get(listItem).isFlag()) {
quesList.get(listItem).setFlag(false);
} else {
quesList.get(listItem).setFlag(true);
}
}
private void setFlagColor() {
if (quesList.get(listItem).isFlag()) {
btnFlag.setBackgroundColor(ContextCompat.getColor(Objects.requireNonNull(this), R.color.black));
btnFlag.setTextColor(ContextCompat.getColor(Objects.requireNonNull(this), R.color.grey));
} else {
btnFlag.setBackgroundColor(ContextCompat.getColor(Objects.requireNonNull(this), R.color.grey_light));
btnFlag.setTextColor(ContextCompat.getColor(Objects.requireNonNull(this), R.color.grey));
}
}
private void setButtonColor() {
btnA.setBackgroundResource(R.color.grey_light);
btnB.setBackgroundResource(R.color.grey_light);
btnC.setBackgroundResource(R.color.grey_light);
btnD.setBackgroundResource(R.color.grey_light);
}
private void displayNextQues() {
if (listItem < totalItem - 1) {
listItem++;
makeAllDisplay();
} else {
btnNext.setVisibility(View.GONE);
btnSubmit.setVisibility(View.VISIBLE);
}
}
private void makeAllDisplay() {
setDisplay(listItem);
setButtonColor();
setFlagColor();
switch (quesList.get(listItem).getSelAnswer()) {
case "optA":
btnA.setBackgroundResource(R.color.sky_blue);
break;
case "optB":
btnB.setBackgroundResource(R.color.sky_blue);
break;
case "optC":
btnC.setBackgroundResource(R.color.sky_blue);
break;
case "optD":
btnD.setBackgroundResource(R.color.sky_blue);
break;
default:
setButtonColor();
break;
}
}
private void displayPrevQues() {
btnNext.setVisibility(View.VISIBLE);
if (listItem > 0 && listItem < totalItem) {
listItem--;
makeAllDisplay();
} else {
Toast.makeText(this, "Cannot GO back!!", Toast.LENGTH_SHORT).show();
}
}
}
and the adapter code is below
public class QuestionLayoutRecyclerAdapter extends RecyclerView.Adapter < QuestionLayoutRecyclerAdapter.FlagViewHolder > {
private ArrayList < mcqQuestion > quesList;
private onItemClickListner onItemClickListner;
public void setOnItemClickListner(QuestionLayoutRecyclerAdapter.onItemClickListner onItemClickListner) {
this.onItemClickListner = onItemClickListner;
}
public interface onItemClickListner {
void onClick(int pos); //pass your object types.
}
public QuestionLayoutRecyclerAdapter(ArrayList < mcqQuestion > quesList) {
this.quesList = quesList;
}
@NonNull@Override
public FlagViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(layout.question_layout, parent, false);
FlagViewHolder flagViewHolder = new FlagViewHolder(view, quesList);
return flagViewHolder;
}
@SuppressLint("ResourceAsColor")@Override
public void onBindViewHolder(@NonNull final FlagViewHolder holder, int position) {
mcqQuestion question_id = quesList.get(position);
holder.tvQuestionNumber.setText("Question " + (position + 1));
if (question_id.isFlag()) {
holder.ivFlag.setImageResource(drawable.right2);
} else {
holder.ivFlag.setImageResource(drawable.white2);
}
holder.itemView.setOnClickListener(new View.OnClickListener() {@Override
public void onClick(View v) {
onItemClickListner.onClick(holder.getAdapterPosition());
}
});
}
@Override
public int getItemCount() {
return quesList.size();
}
public static class FlagViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
ImageView ivFlag;
TextView tvQuestionNumber;
ArrayList < mcqQuestion > quesList;
public FlagViewHolder(@NonNull View itemView, ArrayList < mcqQuestion > quesList) {
super(itemView);
ivFlag = itemView.findViewById(id.iv_layout_flag);
tvQuestionNumber = itemView.findViewById(id.tv_layout_question_number);
itemView.setOnClickListener(this);
this.quesList = quesList;
}
@Override
public void onClick(View v) {
int quesClick = getAdapterPosition();
}
}
}
答案1
得分: 0
尝试这样做：
@Override
public void onBackPressed()
{
Intent intent = new Intent(this, 想要前往的活动类.class);
startActivity(intent);
}
英文:
Try this
@Override
public void onBackPressed()
{
Intent intent = new Intent(this, ActivityWhereYouWantToGo.class);
startActivity(intent);
}
答案2
得分: 0
根据您的代码，您并没有导航到另一个屏幕，您只是在更改可见性。在按返回键时，您可以检查当前显示的视图，并进行相应处理。
@Override
public void onBackPressed() {
if (findViewById(R.id.your_view).getVisibility() == View.VISIBLE) {
// 改变可见性
rvQuesLayout.setVisibility(View.VISIBLE);
llQuestionAll.setVisibility(View.GONE);
// 撤销您在makeAllDisplay()方法中所做的更改
} else {
super.onBackPressed();
}
}
英文:
As per you code, you are not navigation to another screen you are only changing the Visibility. On back press, you can check which view is currently displaying and handle accordingly.
@Override
public void onBackPressed() {
if (findViewById(R.id.your_view).visibility == View.Visible) {
//change your visibility
rvQuesLayout.setVisibility(View.VISIBLE);
llQuestionAll.setVisibility(View.GONE);
//reverse the things you did in makeAllDisplay() method
} else {
super.onBackPressed();
}
}
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