【发布时间】：2019-04-18 20:08:40
【问题描述】：
我已经挣扎了几个小时，但找不到错误。请帮我解决问题。
custom_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<android.support.v7.widget.CardView
android:id="@+id/card_view"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardCornerRadius="10dp"
card_view:cardElevation="5dp"
card_view:cardUseCompatPadding="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:orientation="vertical"
>
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="5dp"
android:layout_marginLeft="5dp"
android:text="Name"
android:layout_marginTop="5dp"
android:textAppearance="?android:attr/textAppearanceLarge"/>
<TextView
android:id="@+id/org"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="Organization"
android:layout_marginBottom="5dp"
android:layout_marginStart="5dp"
android:layout_marginLeft="5dp"
android:textAppearance="?android:attr/textAppearanceMedium"/>
</LinearLayout>
</android.support.v7.widget.CardView>
UserHome.java 该错误特别是在 initviews() 中的以下行。
recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_userhome);
initviews();
fetchdata();
}
private void initviews() {
recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
}
private void fetchdata() {
db.collection("pos-operators")
.get()
.addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot documentSnapshots) {
List<User> favModel = documentSnapshots.toObjects(User.class);
Log.w(TAG,"fetch successful : "+favModel.size());
for(int i=0;i<favModel.size();i++){
Log.w(TAG,"data"+favModel.get(i).getUsername()+" "+favModel.get(i).getOrg());
}
UsersAdapter customAdapter = new UsersAdapter(favModel);
recyclerView.setAdapter(customAdapter);
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.w(TAG,"failed to fetch");
}
});
}
@Override
protected void onStart(){
super.onStart();
db.collection("pos-operators").addSnapshotListener(this,new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
if(documentSnapshots.isEmpty()){
Log.w("UserHome: ","Exec "+e);
}else{
List<User> favModel = documentSnapshots.toObjects(User.class);
UsersAdapter customAdapter = new UsersAdapter(favModel);
recyclerView.setAdapter(customAdapter);
Log.w("","Size onstart "+favModel.size());
}
}
});
}
}
Content_userhome.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".UserHome"
tools:showIn="@layout/app_bar_userhome">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/recycler_view"/>
</android.support.constraint.ConstraintLayout>
但在我看来一切都很好，这里有什么问题。
【问题讨论】：
-
是否可以将代码缩减为minimal, complete, verifiable example？
-
您正在使用 ConstraintLayout id 初始化 recyclerview。
-
请分享您的 recyclerview 布局 xml 以供清晰参考
-
@SultanMahmud 供我参考，你怎么能说使用 ConstraintLayout id 初始化 recyclerview
-
@Quelklef 按要求编辑。请检查
标签： android android-layout android-recyclerview custom-adapter recyclerview-layout