android - 从 Firebase Firestore 中提取数据时 RecyclerView 上的动画
问题描述
我正在尝试将从 firestore 数据库中提取的数据（文档集合）加载到我的 RecylerView 作为事件的 ArrayList。虽然它们确实加载了，但动画没有显示，我收到一条日志说明
E/RecyclerView: No adapter attached; skipping layout. 我不确定这是否是我的动画无法加载的原因。如果有人知道如何纠正我的错误（如果我犯了任何错误），我将不胜感激，以便将来可能最终遇到与我相同问题的任何人都可以在这个问题中找到他们的答案。
以下是我的活动：
package com.washedup.anagnosti.ergo.otherHomePossibilities;
import android.content.Context;
import android.graphics.PorterDuff;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QueryDocumentSnapshot;
import com.google.firebase.firestore.QuerySnapshot;
import com.washedup.anagnosti.ergo.R;
import com.washedup.anagnosti.ergo.eventPerspective.Event;
import java.util.ArrayList;
public class ChooseEventForPerspectiveActivity extends AppCompatActivity {
private RecyclerView rv;
private LinearLayoutManager rLayoutManager;
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private CollectionReference eventsRef = db.collection("events");
private ArrayList<Event> events = new ArrayList<>();
private FirebaseAuth mAuth = FirebaseAuth.getInstance();
private FirebaseUser user = mAuth.getCurrentUser();
private TextView tv;
private ProgressBar pb;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_choose_event_for_perspective);
tv = findViewById(R.id.activity_cefp_tv);
pb = findViewById(R.id.activity_cefp_pb);
pb.getIndeterminateDrawable().setColorFilter(getResources().getColor(R.color.dirtierWhite), PorterDuff.Mode.MULTIPLY);
rv = findViewById(R.id.activity_cefp_rv);
rLayoutManager = new LinearLayoutManager(ChooseEventForPerspectiveActivity.this);
rv.setLayoutManager(rLayoutManager);
//refreshEventRV();
eventsRef.get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
pb.setVisibility(View.VISIBLE);
events.clear();
tv.setText(R.string.loading_events);
String userEmail = user.getEmail();
for(QueryDocumentSnapshot documentSnapshot : queryDocumentSnapshots){
Event event = documentSnapshot.toObject(Event.class);
for(int i=0; i<event.getEmails_of_people().size();i++){
if(userEmail!=null){
if(event.getEmails_of_people().get(i).compareTo(userEmail)==0){
event.setEvent_id(documentSnapshot.getId());
events.add(event);
break;
}
}else{
Toast.makeText(ChooseEventForPerspectiveActivity.this, "[YERROR]: Email is null", Toast.LENGTH_SHORT).show();
}
}
}
if(events.isEmpty()){
pb.setVisibility(View.GONE);
tv.setText(R.string.no_events_to_choose_from);
tv.setVisibility(View.VISIBLE);
}else{
pb.setVisibility(View.GONE);
tv.setVisibility(View.GONE);
runAnimation(rv, 0);
}
}
});
/*eRoleAdapter = new ChooseEventForPerspectiveRecyclerAdapter(events, ChooseEventForPerspectiveActivity.this);
rv.setAdapter(eRoleAdapter);
int resId = R.anim.layout_animation_from_right;
LayoutAnimationController animation = AnimationUtils.loadLayoutAnimation(ChooseEventForPerspectiveActivity.this, resId);
rv.setLayoutAnimation(animation);*/
}
@Override
protected void onResume() {
super.onResume();
refreshEventRV();
}
private void refreshEventRV(){
eventsRef.get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
events.clear();
tv.setText(R.string.loading_events);
String userEmail = user.getEmail();
for(QueryDocumentSnapshot documentSnapshot : queryDocumentSnapshots){
Event event = documentSnapshot.toObject(Event.class);
for(int i=0; i<event.getEmails_of_people().size();i++){
if(userEmail!=null){
if(event.getEmails_of_people().get(i).compareTo(userEmail)==0){
event.setEvent_id(documentSnapshot.getId());
events.add(event);
break;
}
}else{
Toast.makeText(ChooseEventForPerspectiveActivity.this, "[YERROR]: Email is null", Toast.LENGTH_SHORT).show();
}
}
}
if(events.isEmpty()){
tv.setText(R.string.no_events_to_choose_from);
tv.setVisibility(View.VISIBLE);
}else{
tv.setVisibility(View.GONE);
}
}
});
}
private void runAnimation(RecyclerView rv, int type) {
Context context = rv.getContext();
LayoutAnimationController controller = null;
if(type == 0){
controller = AnimationUtils.loadLayoutAnimation(context, R.anim.layout_animation_fall_down);
ChooseEventForPerspectiveRecyclerAdapter eRoleAdapter = new ChooseEventForPerspectiveRecyclerAdapter(events, rv.getContext());
rv.setAdapter(eRoleAdapter);
rv.setLayoutAnimation(controller);
rv.getAdapter().notifyDataSetChanged();
rv.scheduleLayoutAnimation();
}
}
}
package com.washedup.anagnosti.ergo.otherHomePossibilities;
import android.content.Context;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.ImageView;
import com.washedup.anagnosti.ergo.R;
import com.washedup.anagnosti.ergo.eventPerspective.Event;
import java.util.ArrayList;
public class ChooseEventForPerspectiveRecyclerAdapter extends RecyclerView.Adapter<ChooseEventForPerspectiveRecyclerAdapter.ChooseEventForPerspectiveRecyclerViewHolder> {
private ArrayList<Event> events;
private Context context;
//private int lastPosition = -1;
public ChooseEventForPerspectiveRecyclerAdapter(ArrayList<Event> events, Context context){
this.events=events;
this.context=context;
}
@Override
public ChooseEventForPerspectiveRecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.child_activity_choose_event_for_perspective, parent,false);
itemView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));
return new ChooseEventForPerspectiveRecyclerViewHolder(itemView);
}
@Override
public void onBindViewHolder(ChooseEventForPerspectiveRecyclerViewHolder holder, int position) {
Event tempEvent = events.get(holder.getAdapterPosition());
holder.child_activity_cefp_et.setText(tempEvent.getEvent_name());
//setAnimation(holder.itemView,position);
}
/* private void setAnimation(View itemView, int position) {
if(position > lastPosition){
Animation animation = AnimationUtils.loadAnimation(context, R.anim.item_animation_from_right);
itemView.startAnimation(animation);
lastPosition = position;
}
}*/
/*@Override
public void onViewDetachedFromWindow(ChooseEventForPerspectiveRecyclerViewHolder holder) {
(holder).clearAnimation();
}*/
@Override
public int getItemCount() {
return events.size();
}
public class ChooseEventForPerspectiveRecyclerViewHolder extends RecyclerView.ViewHolder {
CardView child_activity_cefp_cv;
EditText child_activity_cefp_et;
ImageView child_activity_cefp_iv;
// FrameLayout child_activity_cefp_container;
public ChooseEventForPerspectiveRecyclerViewHolder(View itemView) {
super(itemView);
child_activity_cefp_cv = itemView.findViewById(R.id.child_activity_choose_event_for_perspective_cv);
child_activity_cefp_et = itemView.findViewById(R.id.child_activity_choose_event_for_perspective_et);
child_activity_cefp_iv = itemView.findViewById(R.id.child_activity_choose_event_for_perspective_iv);
// child_activity_cefp_container = itemView.findViewById(R.id.child_activity_choose_event_for_perspective_item_layout_container);
}
/* public void clearAnimation() {
child_activity_cefp_container.clearAnimation();
}*/
}
}
这些是我的 xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background"
tools:context=".otherHomePossibilities.ChooseEventForPerspectiveActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/activity_cefp_rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:paddingBottom="1dp" />
<TextView
android:id="@+id/activity_cefp_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:fontFamily="@font/roboto_light"
android:textColor="@color/dirtyWhite"
android:textSize="30sp"
android:text="@string/loading_events"/>
<ProgressBar
android:id="@+id/activity_cefp_pb"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/activity_cefp_tv"
android:layout_centerHorizontal="true"
android:visibility="gone"/>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.v7.widget.CardView
android:id="@+id/child_activity_choose_event_for_perspective_cv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:cardBackgroundColor="@color/colorAccent"
app:cardCornerRadius="16dp">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="8dp"
android:paddingEnd="8dp"
android:paddingStart="8dp"
android:paddingTop="8dp">
<ImageView
android:id="@+id/child_activity_choose_event_for_perspective_iv"
android:layout_width="60dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="@+id/child_activity_choose_event_for_perspective_linlay"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="@+id/child_activity_choose_event_for_perspective_linlay"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/child_activity_choose_event_for_perspective_iv"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="@font/roboto_light"
android:paddingStart="20dp"
android:paddingEnd="0dp"
android:text="@string/slider_info_event_name"
android:textColor="@color/dirtyWhite"
android:textSize="15sp" />
<EditText
android:id="@+id/child_activity_choose_event_for_perspective_et"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="@drawable/et_bg"
android:focusable="false"
android:fontFamily="@font/roboto_light"
android:inputType="textCapWords|textAutoCorrect"
android:paddingStart="15dp"
android:paddingEnd="15dp"
android:textColor="@color/dirtyWhite"
android:textSize="15sp" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android"
android:animation="@anim/item_animation_from_right"
android:animationOrder="normal"
android:delay="10%" />
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="@integer/anim_duration_long">
<translate
android:fromXDelta="100%p"
android:interpolator="@android:anim/decelerate_interpolator"
android:toXDelta="0" />
<alpha
android:fromAlpha="0.5"
android:interpolator="@android:anim/accelerate_decelerate_interpolator"
android:toAlpha="1" />
</set>
希望我提供了你需要的一切！
解决方案
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