我嘗試尋找答案，但沒有任何效果，但我相信這段代碼是有問題的，調試器說這是我的文件的鏈接：TodoListApp跳過 1 幀！應用程序可能在其主線程上做了太多工作// working with data ourdoes = findViewById(R.id.ourdoes); ourdoes.setLayoutManager(new LinearLayoutManager(this)); list = new ArrayList<MyDoes>(); // get data from firebase reference = FirebaseDatabase.getInstance().getReference().child("SeaLab13"); reference.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { // set code to retrive data and replace layout for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren()) { MyDoes p = dataSnapshot1.getValue(MyDoes.class); list.add(p); } doesAdapter = new DoesAdapter(MainActivity.this, list); ourdoes.setAdapter(doesAdapter); doesAdapter.notifyDataSetChanged(); } @Override public void onCancelled(DatabaseError databaseError) { // set code to show an error Toast.makeText(getApplicationContext(), "No Data", Toast.LENGTH_SHORT).show(); } });
1 回答
猛跑小豬
TA貢獻1858條經驗 獲得超8個贊
在你的 onCreate 里面：
// Set up your RecyclerView with the appropriate Layout Manager
RecyclerView myRecycler = findViewById(R.id.my_recycler_id);
myRecycler.setLayoutManager(new LinearLayoutManager(this));
// Create your data set
myData = new ArrayList<MyDataType>();
// Create an instance of your adapter passing the data set into the constructor
myAdapter = new MyAdapter(this, myData);
// Set the Adapter on the RecyclerView directly within onCreate
// so that it doesn't get skipped
myRecycler.setAdapter(myAdapter);
在您的事件偵聽器回調中：
@Override
public void onDataChange(DataSnapshot snapshot){
// Add the new data to your data set ex. myData.add(newData)
// ...
// After adding to the data set,
// update the data using a custom function you define in your Adapter's class
myAdapter.updateData(myData);
}
在 Adapter 類中，創建一個函數來更新 Adapter 的數據集：
public void updateData(ArrayList<MyDataType> newDataSet){
myAdapterDataSet = newDataSet;
// Let the Adapter know the data has changed and the view should be refreshed
notifyDataSetChanged();
}
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