Я новичок в Android Studio и Firebase-программировании.
Я пытаюсь написать простое приложение shoplist с RecyclerView, в котором каждый элемент содержит TextView и кнопку переключения.
Если я добавлю более семи элементов в RecyclerView, кнопки переключателей начнут работать очень странно и проверят несколько других кнопок переключателей. Я знаю об утилизации каждого элемента списка в RecyclerView и пытался отыскать эту «проблему» в Google, но не нашел способа внедрить ответы других людей в мой код. Мне кажется, я каким-то образом облажался с адаптером или ViewHolder.
Вот мой адаптер:
public class ListAdapter extends RecyclerView.Adapter<ShoppingItemViewHolder> {
private ArrayList<ShoppingItem> mShoppingItems = new ArrayList<>();
@NonNull
@Override
public ShoppingItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Context mContext = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(mContext);
View listItemView = inflater.inflate(R.layout.list_item, parent, false);
Switch boughtSwitch = listItemView.findViewById(R.id.boughtSwitchId);
TextView itemTextView = listItemView.findViewById(R.id.itemTextView);
return new ShoppingItemViewHolder(listItemView);
}
@Override
public void onBindViewHolder(@NonNull ShoppingItemViewHolder holder, int position) {
ShoppingItem shoppingItem = mShoppingItems.get(position);
holder.bind(shoppingItem);
}
@Override
public int getItemCount() {
return mShoppingItems.size();
}
public void addItem(ShoppingItem shoppingItem){
mShoppingItems.add(shoppingItem);
notifyDataSetChanged();
}
public void removeItem(ShoppingItem shoppingItem){
mShoppingItems.remove(shoppingItem);
notifyDataSetChanged();
}
@Override
public long getItemId(int position) {
return position;
}
А вот мой 'ShoppingItem' ViewHolder (отдельный файл, если это проблема?):
class ShoppingItemViewHolder extends RecyclerView.ViewHolder {
private final TextView productName;
private final Switch boughtSwitch;
public static final String ITEMS_FIREBASE_KEY = "ItemsList";
DatabaseReference ref = FirebaseDatabase.getInstance().getReference(ITEMS_FIREBASE_KEY);
public ShoppingItemViewHolder(View view) {
super(view);
productName = view.findViewById(R.id.itemTextView);
boughtSwitch = view.findViewById(R.id.boughtSwitchId);
}
public void bind(final ShoppingItem shoppingItem){
productName.setText(shoppingItem.productName);
boughtSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
boughtSwitch.setText("Köpt!");
shoppingItem.bought = true;
ref.child(shoppingItem.pushKey).child("bought").setValue(true);
} else {
boughtSwitch.setText("Köpt?");
shoppingItem.bought = false;
ref.child(shoppingItem.pushKey).child("bought").setValue(false);
}
}
});
boughtSwitch.setChecked(shoppingItem.bought);
}
И мой MainActivity:
public class MainActivity extends AppCompatActivity
implements ChildEventListener{
private ArrayList<ShoppingItem> shoppingItems = new ArrayList<>();
public static final String ITEMS_FIREBASE_KEY = "ItemsList";
FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
DatabaseReference ref = firebaseDatabase.getReference(ITEMS_FIREBASE_KEY);
private TextView itemText;
private RecyclerView itemList;
private ListAdapter itemAdapter;
private EditText itemEntry;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
itemList = findViewById(R.id.item_recycler_list);
itemList.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL, false));
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
itemText = findViewById(R.id.itemTextView);
itemEntry = findViewById(R.id.addItemEditText);
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
// .setAction("Action", null).show();
pushToFirebase();
}
});
itemAdapter = new ListAdapter();
itemList.setAdapter(itemAdapter);
ref.addChildEventListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
removeItemsFromFirebase();
return true;
}
return super.onOptionsItemSelected(item);
}
private void pushToFirebase() {
String item = itemEntry.getText().toString();
boolean bought = false;
ShoppingItem shoppingItem = new ShoppingItem(item, bought);
shoppingItem.pushKey = ref.push().getKey();
ref.child(shoppingItem.pushKey).setValue(shoppingItem);
}
private void removeItemsFromFirebase() {
DatabaseReference queryRef = FirebaseDatabase.getInstance().getReference(ITEMS_FIREBASE_KEY);
Query boughtQuery = queryRef.child(ITEMS_FIREBASE_KEY).orderByChild("bought").equalTo(true);
boughtQuery.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot querySnap : dataSnapshot.getChildren()){
querySnap.getRef().removeValue();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
ShoppingItem recievedShoppingItem = dataSnapshot.getValue(ShoppingItem.class);
itemAdapter.addItem(recievedShoppingItem);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
itemAdapter.clearItemList();
ShoppingItem recievedShoppingItem = dataSnapshot.getValue(ShoppingItem.class);
itemAdapter.addItem(recievedShoppingItem);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
ShoppingItem recievedShoppingItem = dataSnapshot.getValue(ShoppingItem.class);
itemAdapter.removeItem(recievedShoppingItem);
itemAdapter.notifyDataSetChanged();
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
itemAdapter.notifyDataSetChanged();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
EDIT:
Вот мой "list_item.xml":
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/itemTextView"
android:layout_width="218dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="TextView"
android:textSize="20dp" />
<Switch
android:id="@+id/boughtSwitchId"
android:layout_width="113dp"
android:layout_height="49dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:text="@string/bought_switch_text" />
Я знаю, что многое предстоит пройти, но я был бы очень признателен, если бы кто-нибудь попытался мне помочь.