Java 为什么我的recyclerview在启动应用程序时不显示?
我在cinemas应用程序上做了一个项目。我想列出我的云firestore中可用的电影院,但不知何故,我创建的应用程序没有显示我的电影院。有时它会出现,但当我进入第二个活动并返回到主要活动时,recycler视图是空的。我认为我的onStart和onStop是正确的。我确实检查了我的LocationAdapter.java、Location.java、cinemalist.xml和activity_home.xml。一切似乎都很好,但当我尝试启动我的应用程序时,只有按钮出现。有人能帮我吗? 这是我的activity_home.xml,下面是我运行应用程序时的结果 My HomeActivity.javaJava 为什么我的recyclerview在启动应用程序时不显示?,java,android,android-recyclerview,google-cloud-firestore,Java,Android,Android Recyclerview,Google Cloud Firestore,我在cinemas应用程序上做了一个项目。我想列出我的云firestore中可用的电影院,但不知何故,我创建的应用程序没有显示我的电影院。有时它会出现,但当我进入第二个活动并返回到主要活动时,recycler视图是空的。我认为我的onStart和onStop是正确的。我确实检查了我的LocationAdapter.java、Location.java、cinemalist.xml和activity_home.xml。一切似乎都很好,但当我尝试启动我的应用程序时,只有按钮出现。有人能帮我吗? 这是
public class HomeActivity extends AppCompatActivity {
RecyclerView recyclerView;
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private CollectionReference movieRef = db.collection("cinemasLocation");
RecyclerView.LayoutManager layoutManager;
private FirestoreRecyclerAdapter<Location, LocationViewHolder> adapter;
FirebaseAuth firebaseAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Button buttonPI = (Button)findViewById(R.id.bPI);
Button buttonMA = (Button)findViewById(R.id.bMovie);
Toolbar toolbar = (Toolbar)findViewById(R.id.TB);
setSupportActionBar(toolbar);
buttonPI.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent (HomeActivity.this,AccountInformation.class);
startActivity(intent);
}
});
buttonMA.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(HomeActivity.this,MovieActivity.class);
startActivity(intent);
}
});
Query query = movieRef.orderBy("title",Query.Direction.ASCENDING);
FirestoreRecyclerOptions<Location> options = new FirestoreRecyclerOptions.Builder<Location>()
.setQuery(query,Location.class)
.build();
recyclerView = findViewById(R.id.rvCinema);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new FirestoreRecyclerAdapter<Location, LocationViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull LocationViewHolder holder, int position, @NonNull Location model) {
holder.setData(model.address,model.image,model.located,model.phone,model.title);
}
@NonNull
@Override
public LocationViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cinemalist,parent,false);
return new LocationViewHolder(view);
}
};
recyclerView.setAdapter(adapter);
}
private class LocationViewHolder extends RecyclerView.ViewHolder{
private View view;
LocationViewHolder(View itemView){
super(itemView);
view = itemView;
}
void setData(String address, String image, String located, String phone, String title){
TextView tvTitleLocation;
TextView tvLocation;
TextView tvPhone;
ImageView moviePicture;
tvTitleLocation = itemView.findViewById(R.id.tvTitleLocation);
tvLocation = itemView.findViewById(R.id.tvAddress);
tvPhone = itemView.findViewById(R.id.tvContact);
moviePicture = itemView.findViewById(R.id.ivLocation);
// Set data to views
tvTitleLocation.setText(title);
tvLocation.setText(located);
tvPhone.setText(phone);
Picasso.get().load(image).into(moviePicture);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main,menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.logOut:
FirebaseAuth.getInstance().signOut();
Intent intToMain = new Intent ( HomeActivity.this,MainActivity.class);
startActivity(intToMain);
finish();
return true;
case android.R.id.home:
onBackPressed();
return true;
default:
onResume();
return super.onOptionsItemSelected(item);
}
}
@Override
protected void onStart() {
super.onStart();
adapter.startListening();
}
@Override
protected void onStop() {
super.onStop();
if (adapter != null) {
adapter.stopListening();
}
}
}
公共类HomeActivity扩展了AppCompatActivity{
回收视图回收视图;
私有FirebaseFirestore db=FirebaseFirestore.getInstance();
私人收藏参考movieRef=db.collection(“电影收藏”);
RecyclerView.LayoutManager LayoutManager;
私人FirestoreRecyclerAdapter适配器;
FirebaseAuth FirebaseAuth;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Button buttonPI=(Button)findViewById(R.id.bPI);
Button buttonMA=(Button)findViewById(R.id.bMovie);
Toolbar Toolbar=(Toolbar)findViewById(R.id.TB);
设置支持操作栏(工具栏);
buttonPI.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意向意向=新意向(HomeActivity.this、AccountInformation.class);
星触觉(意向);
}
});
buttonMA.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意向意向=新意向(HomeActivity.this,MovieActivity.class);
星触觉(意向);
}
});
Query Query=movieRef.orderBy(“title”,Query.Direction.升序);
FirestoreRecyclerOptions选项=新建FirestoreRecyclerOptions.Builder()
.setQuery(查询,Location.class)
.build();
recyclerView=findViewById(R.id.rvCinema);
recyclerView.setHasFixedSize(true);
layoutManager=新的LinearLayoutManager(此);
recyclerView.setLayoutManager(layoutManager);
适配器=新FirestoreRecyclerAdapter(选项){
@凌驾
受保护的无效onBindViewHolder(@NonNull位置ViewHolder holder,int位置,@NonNull位置模型){
holder.setData(型号、地址、型号、图像、型号、位置、型号、电话、型号、标题);
}
@非空
@凌驾
public LocationViewHolder onCreateViewHolder(@NonNull ViewGroup父级,int-viewType){
View-View=LayoutInflater.from(parent.getContext()).flate(R.layout.cinemalist,parent,false);
返回新位置ViewHolder(视图);
}
};
recyclerView.setAdapter(适配器);
}
私有类LocationViewHolder扩展了RecyclerView.ViewHolder{
私人视野;
LocationViewHolder(查看项目视图){
超级(项目视图);
视图=项目视图;
}
void setData(字符串地址、字符串图像、字符串位置、字符串电话、字符串标题){
文本视图标题位置;
文本视图位置;
TextView电视电话;
ImageView电影图片;
TVTTitleLocation=itemView.findViewById(R.id.TVTTitleLocation);
tvLocation=itemView.findViewById(R.id.tvAddress);
tvPhone=itemView.findviewbyd(R.id.tvContact);
moviePicture=itemView.findviewbyd(R.id.ivLocation);
//将数据设置为视图
tvTitleLocation.setText(标题);
tvLocation.setText(已定位);
tvPhone.setText(电话);
毕加索.get().load(图像).into(电影图片);
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
getMenuInflater().充气(右菜单主菜单);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
开关(item.getItemId()){
案例R.id.注销:
FirebaseAuth.getInstance().signOut();
Intent intToMain=新的Intent(HomeActivity.this、MainActivity.class);
起始触觉(intToMain);
完成();
返回true;
案例android.R.id.home:
onBackPressed();
返回true;
违约:
onResume();
返回super.onOptionsItemSelected(项目);
}
}
@凌驾
受保护的void onStart(){
super.onStart();
adapter.startListening();
}
@凌驾
受保护的void onStop(){
super.onStop();
if(适配器!=null){
adapter.stopListening();
}
}
}
activtiy_home.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".HomeActivity">
<androidx.appcompat.widget.Toolbar
android:id="@+id/TB"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/colorPrimary"
android:elevation="4dp"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/TB"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rvCinema"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="50dp" />
<Button
android:id="@+id/bPI"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Personal Information" />
<Space
android:layout_width="match_parent"
android:layout_height="50dp" />
<Button
android:id="@+id/bMovie"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Movie Available" />
</LinearLayout>
</RelativeLayout>
已编辑:我删除我的LocationAdapter.java,并在您的HomeActivity中使用FirestoreRecyclerAdapter非匿名实现作为参考:
编辑:
private class LocationViewHolder extends RecyclerView.ViewHolder{
private View view;
LocationViewHolder(View itemView){
super(itemView);
view = itemView;
}
void setData(String address, String image, String located, String phone, String title){
TextView tvTitleLocation;
TextView tvLocation;
TextView tvPhone;
ImageView moviePicture;
tvTitleLocation = itemView.findViewById(R.id.tvTitleLocation);
tvLocation = itemView.findViewById(R.id.tvAddress);
tvPhone = itemView.findViewById(R.id.tvContact);
moviePicture = itemView.findViewById(R.id.ivLocation);
// Set data to views
tvTitleLocation.setText(title);
tvLocation.setText(located);
tvPhone.setText(phont);
moviePicture.setText(image);
}
}
供参考:
编辑:
private class LocationViewHolder extends RecyclerView.ViewHolder{
private View view;
LocationViewHolder(View itemView){
super(itemView);
view = itemView;
}
void setData(String address, String image, String located, String phone, String title){
TextView tvTitleLocation;
TextView tvLocation;
TextView tvPhone;
ImageView moviePicture;
tvTitleLocation = itemView.findViewById(R.id.tvTitleLocation);
tvLocation = itemView.findViewById(R.id.tvAddress);
tvPhone = itemView.findViewById(R.id.tvContact);
moviePicture = itemView.findViewById(R.id.ivLocation);
// Set data to views
tvTitleLocation.setText(title);
tvLocation.setText(located);
tvPhone.setText(phont);
moviePicture.setText(image);
}
}
请更新此行
recyclerView.setHasFixedSize(true);
借
请更新此行
recyclerView.setHasFixedSize(true);
借
请添加您的位置的内容
@AlexMamo对不起,您所说的内容是什么意思?您不能在适配器内使用位置
。将locations
列表放在那里和里面onBindViewHolder()
使用ArrayList
和position
值。@Ashish我得到了另一个从cloud firestore接收数据的活动,我的应用确实收到了data@SkypeDogg你能给我一个我不明白的bcs代码吗。抱歉,我是新手,请添加位置的内容@AlexMamo so