FirebaseRecyclerAdapter具有多个ViewType ==>黑屏?

时间:2017-08-18 12:27:59

标签: android firebase firebase-realtime-database android-recyclerview firebaseui

我在当前项目中使用FirebaseRecyclerAdapter多个ViewType,它显示黑屏!!?

任何人都可以帮我解决这个问题吗?

在代码或布局中出现问题?或其他一些东西

  

FirebaseRecyclerAdapter的问题我们发现的是它的方式   写的永远不会支持多种视图类型。这是真的吗?

我的java代码:

private void displayChatMessages() {

    RecyclerView listOfMessages = (RecyclerView)findViewById(R.id.myRv);
    mAdapter = new FirebaseRecyclerAdapter<ChatMessage, RecyclerView.ViewHolder>(
            ChatMessage.class, R.layout.list_item_chat, RecyclerView.ViewHolder.class, FirebaseDatabase.getInstance().getReference()) {
        @Override
        protected void populateViewHolder(final RecyclerView.ViewHolder viewHolder, final ChatMessage user,
                                          final int position) {
            switch (user.getMessageUser()) {
                case "test@test.com":
                    HolderMe vh1 = (HolderMe)viewHolder;
                    populateType1(vh1, user, position);
                    toaa1("cbn");
                    break;
                case "test2@test2.com":
                    populateType2((HolderYou) viewHolder, user, position);
                    break;
                case "3":
                    populateType3((HolderDate) viewHolder, user, position);
                    break;
            }
        }

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            switch (viewType) {
                case 1:
                    View userType1 = LayoutInflater.from(parent.getContext())
                            .inflate(R.layout.layout_holder_me, parent, false);
                    toaa1("cbn2");
                    return new HolderMe(userType1);
                case 2:
                    View userType2 = LayoutInflater.from(parent.getContext())
                            .inflate(R.layout.layout_holder_you, parent, false);
                    return new HolderYou(userType2);
                case 3:
                    View userType3 = LayoutInflater.from(parent.getContext())
                            .inflate(R.layout.layout_holder_date, parent, false);
                    return new HolderDate(userType3);
            }
            return super.onCreateViewHolder(parent, viewType);
        }

        @Override
        public int getItemViewType(int position) {
            ChatMessage user = getItem(position);
            switch (user.getMessageUser()) {
                case "test@test.com":
                    toaa1("cbn3");
                    return 1;
                case "test2@test2.com":
                    return 2;
                case "3":
                    return 3;
            }
            return super.getItemViewType(position);
        }

        private void populateType1(HolderMe v, ChatMessage model, int position) {
            v.getTimeView().setText(DateFormat.format("HH:mm",model.getMessageTime()));
            v.getTextv().setText(model.getMessageText());
        }

        private void toaa1( String text) {
            Toast.makeText(ChatActivity.this,text,Toast.LENGTH_LONG).show();
        }
        private void  populateType2(HolderYou vv, ChatMessage model, int position) {
            vv.getTextv().setText(DateFormat.format("HH:mm",model.getMessageTime()));
            vv.getTimeView().setText(model.getMessageText());
        }
        private void populateType3(HolderDate vcv, ChatMessage model, int position) {
            vcv.getDate().setText(DateFormat.format("HH:mm",model.getMessageTime()));
        }
    };
    listOfMessages.setAdapter(mAdapter);
}

我的xml:

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="com.marxhack.ma153.ActivityChatNew"
    tools:showIn="@layout/app_bar_activity_chat_new">

    <EditText
        android:id="@+id/msginput"
        android:layout_width="310dp"
        android:layout_height="35dp"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.17"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.982"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/myRv"
        android:layout_width="358dp"
        android:layout_height="450dp"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />
</android.support.constraint.ConstraintLayout>

编辑:问题已解决

    .
    .
    .
RecyclerView recycler = (RecyclerView)findViewById(R.id.myRv);
        recycler.setHasFixedSize(true);
        recycler.setLayoutManager(new LinearLayoutManager(this));
    .
    .
    .

1 个答案:

答案 0 :(得分:0)

昨天我正在使用类似的东西,我清楚地记得布局是一个字段变量,所以在我看来它必须是真的。经过仔细检查,我发现这也是最终的,所以你可以在启动后进行更改。

enter image description here

需要注意的是Firebase-Ui库,其中任何一个都是为了加快您的启动项目。经过一段时间或在处理更复杂的案件时,你将不得不照顾它。

在这种情况下,如果您查看库类,您将看到更大的优势是用于处理正在更新数据的child event listener的switch案例。检查一下,也许一个拉动请求可以帮助我们所有人,祝我的朋友好运:))