Java 即使设置了适配器，也不会显示RecyclerView
我陷入了这个问题，我不知道这是怎么回事。我正在尝试使用RecyclerView并使用Firebase实时数据库中的数据填充它。我已经设置了适配器，但问题是onBindViewHolder和onCreateViewHolder没有被调用。这是密码 WorkoutAdapter.javaJava 即使设置了适配器，也不会显示RecyclerView,java,android,firebase,firebase-realtime-database,android-recyclerview,Java,Android,Firebase,Firebase Realtime Database,Android Recyclerview,我陷入了这个问题，我不知道这是怎么回事。我正在尝试使用RecyclerView并使用Firebase实时数据库中的数据填充它。我已经设置了适配器，但问题是onBindViewHolder和onCreateViewHolder没有被调用。这是密码 WorkoutAdapter.java public class WorkoutAdapter extends RecyclerView.Adapter<WorkoutAdapter.WorkoutViewHolder> { private
public class WorkoutAdapter extends RecyclerView.Adapter<WorkoutAdapter.WorkoutViewHolder> {
private List<Workout> workoutList;
public WorkoutAdapter(List<Workout> workoutList) {
this.workoutList = workoutList;
}
public WorkoutAdapter() {
}
public List<Workout> getWorkoutList() {
return workoutList;
}
public void setWorkoutList(List<Workout> workoutList) {
this.workoutList = workoutList;
}
@NonNull
@Override
public WorkoutViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Log.i("DEBUG MENU", "onCreateViewHolder");
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
ItemWorkoutBinding binding = ItemWorkoutBinding.inflate(layoutInflater, parent, false);
return new WorkoutViewHolder(binding);
}
@Override
public void onBindViewHolder(@NonNull WorkoutViewHolder holder, int position) {
Log.i("DEBUG MENU", "onBindViewHolder");
Workout workout = workoutList.get(position);
holder.bind(workout);
}
@Override
public int getItemCount() {
return workoutList.size();
}
class WorkoutViewHolder extends RecyclerView.ViewHolder {
private ItemWorkoutBinding binding;
public WorkoutViewHolder(ItemWorkoutBinding binding) {
super(binding.getRoot());
this.binding = binding;
}
public void bind(Workout workout) {
binding.setWorkout(workout);
binding.executePendingBindings();
}
}
public class WorkoutPlanFragment extends Fragment {
private WorkoutPlanViewModel mViewModel;
private WorkoutPlanFragmentBinding binding;
private DatabaseReference mDatabase;
Plan plan;
List<Workout> workoutList;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDatabase = FirebaseDatabase.getInstance().getReference();
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
WorkoutPlanViewModelFactory workoutPlanViewModelFactory = new WorkoutPlanViewModelFactory(workoutList);
mViewModel = new ViewModelProvider(this, workoutPlanViewModelFactory).get(WorkoutPlanViewModel.class);
binding = DataBindingUtil.inflate(inflater, R.layout.workout_plan_fragment, container, false);
binding.setViewmodel(mViewModel);
View view = binding.getRoot();
assert getArguments() != null;
plan = WorkoutPlanFragmentArgs.fromBundle(getArguments()).getPlan();
((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(plan.getPlan_name());
Glide.with(binding.getRoot().getContext()).load(plan.getUri()).into(binding.imageView2);
return view;
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
binding.setPlan(plan);
setupRvWorkout();
}
public void setupRvWorkout() {
RecyclerView recyclerView = binding.workoutRV;
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
mDatabase.child("exercise_workout").child("data").orderByChild("plan_id").equalTo(plan.getPlan_key()).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
workoutList = new ArrayList<>();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
String workout_id = snapshot.child("workout_id").getValue(String.class);
mDatabase.child("workout").child(workout_id).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
Workout workout = snapshot.getValue(Workout.class);
workout.setWorkout_id(workout_id);
Log.d("GET", "workout_name: " + workout.getWorkout_name() + " " + workout.getWorkout_id());
workoutList.add(workout);
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
WorkoutAdapter adapter = new WorkoutAdapter();
recyclerView.setAdapter(adapter);
adapter.setWorkoutList(workoutList);
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
公共类WorkoutAdapter扩展了RecyclerView.Adapter{
私人名单；
公共工作适配器（列表工作列表）{
this.workoutList=workoutList；
}
公共训练适应器（）{
}
公共列表getWorkoutList（）{
返回工作列表；
}
公共作废设置作业列表（列表作业列表）{
this.workoutList=workoutList；
}
@非空
@凌驾
public WorkoutViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int-viewType）{
i（“调试菜单”、“onCreateViewHolder”）；
LayoutInflater LayoutInflater=LayoutInflater.from（parent.getContext（））；
ItemWorkoutBinding=ItemWorkoutBinding.inflate（布局平坦，父项，false）；
返回新的WorkoutViewHolder（绑定）；
}
@凌驾
BindViewHolder上的公共无效（@NonNull WorkoutViewHolder，int位置）{
i（“调试菜单”、“onBindViewHolder”）；
训练=训练列表。获取（位置）；
束缚（锻炼）；
}
@凌驾
public int getItemCount（）{
返回workoutList.size（）；
}
类WorkoutViewHolder扩展了RecyclerView.ViewHolder{
私有项绑定；
公共WorkoutViewHolder（ItemWorkoutBinding绑定）{
super（binding.getRoot（））；
这个。绑定=绑定；
}
公共空间绑定（训练）{
绑定。设置训练（训练）；
binding.executePendingBindings（）；
}
}
public class WorkoutAdapter extends RecyclerView.Adapter<WorkoutAdapter.WorkoutViewHolder> {
private List<Workout> workoutList;
public WorkoutAdapter(List<Workout> workoutList) {
this.workoutList = workoutList;
}
public WorkoutAdapter() {
}
public List<Workout> getWorkoutList() {
return workoutList;
}
public void setWorkoutList(List<Workout> workoutList) {
this.workoutList = workoutList;
}
@NonNull
@Override
public WorkoutViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Log.i("DEBUG MENU", "onCreateViewHolder");
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
ItemWorkoutBinding binding = ItemWorkoutBinding.inflate(layoutInflater, parent, false);
return new WorkoutViewHolder(binding);
}
@Override
public void onBindViewHolder(@NonNull WorkoutViewHolder holder, int position) {
Log.i("DEBUG MENU", "onBindViewHolder");
Workout workout = workoutList.get(position);
holder.bind(workout);
}
@Override
public int getItemCount() {
return workoutList.size();
}
class WorkoutViewHolder extends RecyclerView.ViewHolder {
private ItemWorkoutBinding binding;
public WorkoutViewHolder(ItemWorkoutBinding binding) {
super(binding.getRoot());
this.binding = binding;
}
public void bind(Workout workout) {
binding.setWorkout(workout);
binding.executePendingBindings();
}
}
public class WorkoutPlanFragment extends Fragment {
private WorkoutPlanViewModel mViewModel;
private WorkoutPlanFragmentBinding binding;
private DatabaseReference mDatabase;
Plan plan;
List<Workout> workoutList;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDatabase = FirebaseDatabase.getInstance().getReference();
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
WorkoutPlanViewModelFactory workoutPlanViewModelFactory = new WorkoutPlanViewModelFactory(workoutList);
mViewModel = new ViewModelProvider(this, workoutPlanViewModelFactory).get(WorkoutPlanViewModel.class);
binding = DataBindingUtil.inflate(inflater, R.layout.workout_plan_fragment, container, false);
binding.setViewmodel(mViewModel);
View view = binding.getRoot();
assert getArguments() != null;
plan = WorkoutPlanFragmentArgs.fromBundle(getArguments()).getPlan();
((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(plan.getPlan_name());
Glide.with(binding.getRoot().getContext()).load(plan.getUri()).into(binding.imageView2);
return view;
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
binding.setPlan(plan);
setupRvWorkout();
}
public void setupRvWorkout() {
RecyclerView recyclerView = binding.workoutRV;
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
mDatabase.child("exercise_workout").child("data").orderByChild("plan_id").equalTo(plan.getPlan_key()).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
workoutList = new ArrayList<>();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
String workout_id = snapshot.child("workout_id").getValue(String.class);
mDatabase.child("workout").child(workout_id).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
Workout workout = snapshot.getValue(Workout.class);
workout.setWorkout_id(workout_id);
Log.d("GET", "workout_name: " + workout.getWorkout_name() + " " + workout.getWorkout_id());
workoutList.add(workout);
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
WorkoutAdapter adapter = new WorkoutAdapter();
recyclerView.setAdapter(adapter);
adapter.setWorkoutList(workoutList);
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
公共类WorkoutPlanFragment扩展了片段{
私人训练计划视图模型mViewModel；
私人作业计划碎片绑定；
私有数据库参考数据库；
计划；
工作清单；
@凌驾
创建时的公共void（@Nullable Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
mDatabase=FirebaseDatabase.getInstance（）.getReference（）；
}
@凌驾
创建视图时的公共视图（@NonNull LayoutInflater充气机，@null可查看组容器，
@可为空的捆绑包savedInstanceState）{
WorkoutPlanViewModelFactory WorkoutPlanViewModelFactory=新的WorkoutPlanViewModelFactory（workoutList）；
mViewModel=新的ViewModelProvider（此，workoutPlanViewModelFactory）.get（WorkoutPlanViewModel.class）；
绑定=数据绑定直到充气（充气机，右布局图，训练计划图，容器，假）；
binding.setViewmodel（mViewModel）；
View=binding.getRoot（）；
断言getArguments（）！=null；
plan=WorkoutPlanFragmentArgs.frombund（getArguments（））.getPlan（）；
（（AppCompatActivity）getActivity（））.getSupportActionBar（）.setTitle（plan.getPlan_name（））；
Glide.with（binding.getRoot（）.getContext（））.load（plan.getUri（））.into（binding.imageView2）；
返回视图；
}
@凌驾
已创建公用void onview（@NonNull视图，@Nullable Bundle savedInstanceState）{
super.onViewCreated（视图，savedInstanceState）；
具有约束力。设定计划（plan）；
setupRvWorkout（）；
}
公共空间{
RecyclerView RecyclerView=binding.workoutRV；
LinearLayoutManager布局管理器=新的LinearLayoutManager（getContext（），LinearLayoutManager.VERTICAL，false）；
recyclerView.setLayoutManager（layoutManager）；
mDatabase.child（“运动锻炼”）.child（“数据”）.orderByChild（“计划id”）.equalTo（计划.获取计划密钥（））.addValueEventListener（新的ValueEventListener（））{
@凌驾
public void onDataChange（@NonNull DataSnapshot DataSnapshot）{
workoutList=newarraylist（）；
对于（DataSnapshot快照：DataSnapshot.getChildren（））{
String-workout\u-id=snapshot.child（“workout\u-id”）.getValue（String.class）；
mDatabase.child（“训练”）.child（训练id）.addListenerForSingleValueEvent（新值EventListener（））{
@凌驾
public void onDataChange（@NonNull DataSnapshot snapshot snapshot）{
锻炼锻炼=快照.getValue（锻炼.class）；
训练。设置训练id（训练id）；
Log.d（“GET”，“训练计划名称：”+workout.getWorkout\u name（）+“”+workout.getWorkout\u id（））；
训练列表。添加（训练）；
}
@凌驾
已取消公共void（@NonNull DatabaseError）{
}
});
}
修井适配器=新修井适配器（）；
recyclerView.setAdapter（适配器）；
adapter.setWorkoutList（workoutList）；
adapter.notifyDataSetChanged（）；
}
@凌驾
已取消公共void（@NonNull DatabaseError）{
}
});
}
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/txt_workout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:fontFamily="@font/roboto_medium"
android:text="@{workout.workout_name}"
android:textSize="24sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
<data>
<variable
name="workout"
type="com.example.zahfitclient.model.Workout" />
</data>
</layout>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/frameLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.workoutplan.WorkoutPlanFragment">
<ImageView
android:id="@+id/imageView2"
android:layout_width="0dp"
android:layout_height="180dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:src="@tools:sample/avatars" />
<TextView
android:id="@+id/txt_plannameWO"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:fontFamily="@font/roboto_slab_bold"
android:text="@{plan.plan_name}"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView2" />
<TextView
android:id="@+id/txt_planlevelWO"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:fontFamily="@font/roboto_medium"
android:text="@{plan.level_name}"
android:textColor="?android:attr/textColorSecondary"
app:layout_constraintEnd_toStartOf="@+id/view"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />
<TextView
android:id="@+id/txt_plantypeWO"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/roboto_medium"
android:text="@{plan.type_name}"
android:textColor="?android:attr/textColorSecondary"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="@+id/view"
app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />
<View
android:id="@+id/view"
android:layout_width="2dp"
android:layout_height="20dp"
android:layout_marginStart="204dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="204dp"
android:background="@color/black"
android:backgroundTint="@color/material_on_surface_emphasis_medium"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/workoutRV"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/view" />
</androidx.constraintlayout.widget.ConstraintLayout>
<data>
<variable
name="plan"
type="com.example.zahfitclient.model.Plan" />
<variable
name="viewmodel"
type="com.example.zahfitclient.ui.workoutplan.WorkoutPlanViewModel" />
</data>
</layout>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/txt_workout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:fontFamily="@font/roboto_medium"
android:text="@{workout.workout_name}"
android:textSize="24sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
<data>
<variable
name="workout"
type="com.example.zahfitclient.model.Workout" />
</data>
</layout>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/frameLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.workoutplan.WorkoutPlanFragment">
<ImageView
android:id="@+id/imageView2"
android:layout_width="0dp"
android:layout_height="180dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:src="@tools:sample/avatars" />
<TextView
android:id="@+id/txt_plannameWO"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:fontFamily="@font/roboto_slab_bold"
android:text="@{plan.plan_name}"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView2" />
<TextView
android:id="@+id/txt_planlevelWO"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:fontFamily="@font/roboto_medium"
android:text="@{plan.level_name}"
android:textColor="?android:attr/textColorSecondary"
app:layout_constraintEnd_toStartOf="@+id/view"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />
<TextView
android:id="@+id/txt_plantypeWO"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/roboto_medium"
android:text="@{plan.type_name}"
android:textColor="?android:attr/textColorSecondary"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toEndOf="@+id/view"
app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />
<View
android:id="@+id/view"
android:layout_width="2dp"
android:layout_height="20dp"
android:layout_marginStart="204dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="204dp"
android:background="@color/black"
android:backgroundTint="@color/material_on_surface_emphasis_medium"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/txt_plannameWO" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/workoutRV"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/view" />
</androidx.constraintlayout.widget.ConstraintLayout>
<data>
<variable
name="plan"
type="com.example.zahfitclient.model.Plan" />
<variable
name="viewmodel"
type="com.example.zahfitclient.ui.workoutplan.WorkoutPlanViewModel" />
</data>
</layout>
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
workoutList = new ArrayList < > ();
WorkoutAdapter adapter = new WorkoutAdapter();
recyclerView.setAdapter(adapter);
int[] num= {0};
for (DataSnapshot snapshot: dataSnapshot.getChildren()) {
String workout_id = snapshot.child("workout_id").getValue(String.class);
mDatabase.child("workout").child(workout_id).
addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
Workout workout = snapshot.getValue(Workout.class);
workout.setWorkout_id(workout_id);
Log.d("GET", "workout_name: " + workout.getWorkout_name() +
" " + workout.getWorkout_id());
workoutList.add(workout);
num[0]=num[0]++;
if(num[0]==dataSnapshot.getChildren().size(){
adapter.setWorkoutList(workoutList);
adapter.notifyDataSetChanged();
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {}
});
}
@覆盖
public void onDataChange（@NonNull DataSnapshot DataSnapshot）{
workoutList=新阵列列表<>（）；
修井适配器=新修井适配器（）；
recyclerView.setAdapter（适配器）；
int[]num={0}；
对于（DataSnapshot快照：DataSnapshot.getChildren（））{
String-workout\u-id=snapshot.child（“workout\u-id”）.getValue（String.class）；
mDatabase.child（“训练”）.child（训练id）。
addListenerForSingleValueEvent（新的ValueEventListener（）{
@凌驾
mDatabase.child("exercise_workout").child("data").orderByChild("plan_id").equalTo(plan.getPlan_key()).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
workoutList = new ArrayList<>();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
String workout_id = snapshot.child("workout_id").getValue(String.class);
mDatabase.child("workout").child(workout_id).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
Workout workout = snapshot.getValue(Workout.class);
workout.setWorkout_id(workout_id);
Log.d("GET", "workout_name: " + workout.getWorkout_name() + " " + workout.getWorkout_id());
workoutList.add(workout);
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
throw error.toException(); // don't ignore errors
}
});
}
WorkoutAdapter adapter = new WorkoutAdapter();
recyclerView.setAdapter(adapter);
adapter.setWorkoutList(workoutList);
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
throw error.toException(); // don't ignore errors
}
});
WorkoutAdapter adapter = new WorkoutAdapter();
recyclerView.setAdapter(adapter);
workoutList = new ArrayList<>();
adapter.setWorkoutList(workoutList);
mDatabase.child("exercise_workout").child("data").orderByChild("plan_id").equalTo(plan.getPlan_key()).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
workoutList.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
String workout_id = snapshot.child("workout_id").getValue(String.class);
mDatabase.child("workout").child(workout_id).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
Workout workout = snapshot.getValue(Workout.class);
workout.setWorkout_id(workout_id);
Log.d("GET", "workout_name: " + workout.getWorkout_name() + " " + workout.getWorkout_id());
workoutList.add(workout);
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
throw error.toException(); // don't ignore errors
}
});
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
throw error.toException(); // don't ignore errors
}
});