我有一个日期选择器，可以将所选日期写入 TextView 。我想将此 TextView 中的数据添加到我现有的 firebase 数据库中。 我不确定我需要更改哪些数据才能添加到日期中。我是否需要在有名称和类别的任何地方添加它？从 TextView 添加字符串时，过程是否不同。
另外，将来我将使用日期在食物即将过期时发出推送通知......如果将日期保存为字符串可以吗？
添加食物类:
public class Food {
private String foodId;
private String foodName;
private String foodCategory;
private String bestBefore;
public Food(String foodId, String foodName, String foodCategory, String bestBefore) {
this.foodId = foodId;
this.foodName = foodName;
this.foodCategory = foodCategory;
this.bestBefore = bestBefore;
}
public String getFoodId() {
return foodId;
}
public String getBestBefore() { return bestBefore;}
public String getFoodName() {
return foodName;
}
public String getFoodCategory() {
return foodCategory;
}
public Food(){
//this constructor is required
}
日期选择器和添加食物到 firebase :
public class addFood extends AppCompatActivity implements DatePickerDialog.OnDateSetListener {
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
//we will use these constants later to pass the artist name and id to another activity
public static final String FOOD_NAME = "net.simplifiedcoding.firebasedatabaseexample.artistname";
public static final String FOOD_ID = "net.simplifiedcoding.firebasedatabaseexample.artistid";
public static final String FOOD_DATE = "net.simplifiedcoding.firebasedatabaseexample.fooddate";
//view objects
EditText editTextName;
Spinner spinnerCategory;
Button buttonAddFood;
ListView listViewFoods;
Button buttonScan;
Button buttonSearch;
TextView dateText;
//a list to store all the foods from firebase database
List<Food> foods;
//our database reference object
DatabaseReference databaseFoods;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_food);
//getting the reference of artists node
databaseFoods = FirebaseDatabase.getInstance().getReference("foods").child(uid);
//getting views
editTextName = (EditText) findViewById(R.id.editTextName);
spinnerCategory = (Spinner) findViewById(R.id.spinnerCategories);
listViewFoods = (ListView) findViewById(R.id.listViewFoods);
buttonScan = (Button) findViewById(R.id.buttonScan);
buttonSearch = (Button) findViewById(R.id.buttonSearch);
final Button dateButton = (Button) findViewById(R.id.DateButton);
dateText = (TextView) findViewById(R.id.DateText);
buttonAddFood = (Button) findViewById(R.id.buttonAddFood);
//list to store artists
foods = new ArrayList<>();
//adding an onclicklistener to button
buttonAddFood.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//calling the method addArtist()
//the method is defined below
//this method is actually performing the write operation
addFood();
}
});
dateButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
android.support.v4.app.DialogFragment datePicker = new DatePickerFragment();
datePicker.show(getSupportFragmentManager(), "date picker");
}
});
buttonScan.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(addFood.this, BarcodeDetect.class);
//starting the activity with intent
startActivity(intent);
}
});
buttonSearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(addFood.this, SearchBar.class);
//starting the activity with intent
startActivity(intent);
}
});
//attaching listener to listview
listViewFoods.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//getting the selected artist
Food food = foods.get(i);
//creating an intent
Intent intent = new Intent(getApplicationContext(), nutritionalInfo.class);
//putting artist name and id to intent
intent.putExtra(FOOD_ID, food.getFoodId());
intent.putExtra(FOOD_NAME, food.getFoodName());
intent.putExtra(FOOD_DATE, food.getBestBefore());
//starting the activity with intent
startActivity(intent);
}
});
listViewFoods.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
Food food = foods.get(i);
showUpdateDeleteDialog(food.getFoodId(), food.getFoodName());
return true;
}
});
}
@Override
public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, i);
c.set(Calendar.MONTH, i1);
c.set(Calendar.DAY_OF_MONTH, i2);
String currentDateString = DateFormat.getDateInstance(DateFormat.FULL).format(c.getTime());
// TextView dateText = (TextView) findViewById(R.id.DateText);
dateText.setText(currentDateString);
}
protected void onStart() {
super.onStart();
//attaching value event listener
databaseFoods.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
//clearing the previous artist list
foods.clear();
//iterating through all the nodes
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
//getting artist
Food food = postSnapshot.getValue(Food.class);
//adding artist to the list
foods.add(food);
}
//creating adapter
FoodList foodAdapter = new FoodList(addFood.this, foods);
//attaching adapter to the listview
listViewFoods.setAdapter(foodAdapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
/*
* This method is saving a new artist to the
* Firebase Realtime Database
* */
private void addFood() {
//getting the values to save
String name = editTextName.getText().toString().trim();
String category = spinnerCategory.getSelectedItem().toString();
String bestBefore = dateText.toString();
//checking if the value is provided
if (!TextUtils.isEmpty(name)) {
//getting a unique id using push().getKey() method
//it will create a unique id and we will use it as the Primary Key for our Artist
String id = databaseFoods.push().getKey();
//creating an Artist Object
// Food food = new Food(id, name, category, bestBefore);
//Saving the Artist
// databaseFoods.child(id).setValue(food);
Map<Object, String> food = new HashMap<>();
food.put("id", food.getId());
food.put("name", food.getName());
food.put("category", food.getCategory());
food.put("bestBefore", food.getbestBefore());
databaseFoods.child(id).push(map);
//setting edittext to blank again
editTextName.setText("");
//displaying a success toast
Toast.makeText(this, "food added", Toast.LENGTH_LONG).show();
} else {
//if the value is not given displaying a toast
Toast.makeText(this, "Please enter a food", Toast.LENGTH_LONG).show();
}
}
private boolean updateFood(String id, String name, String category, String bestBefore) {
//getting the specified artist reference
DatabaseReference dR = FirebaseDatabase.getInstance().getReference("foods").child(uid).child(id);
//updating artist
Food food = new Food(id, name, category, bestBefore);
dR.setValue(food);
Toast.makeText(getApplicationContext(), "Food Updated", Toast.LENGTH_LONG).show();
return true;
}
private void showUpdateDeleteDialog(final String foodId, String foodName) {
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
LayoutInflater inflater = getLayoutInflater();
final View dialogView = inflater.inflate(R.layout.update_dialog, null);
dialogBuilder.setView(dialogView);
final EditText editTextName = (EditText) dialogView.findViewById(R.id.editTextName);
final Spinner spinnerCategory = (Spinner) dialogView.findViewById(R.id.spinnerCategories);
final EditText editTextDate = (EditText) dialogView.findViewById(R.id.editTextDate);
final Button buttonUpdate = (Button) dialogView.findViewById(R.id.buttonUpdateFood);
final Button buttonDelete = (Button) dialogView.findViewById(R.id.buttonDeleteFood);
dialogBuilder.setTitle(foodName);
final AlertDialog b = dialogBuilder.create();
b.show();
buttonUpdate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = editTextName.getText().toString().trim();
String category = spinnerCategory.getSelectedItem().toString();
String bestBefore = editTextDate.getText().toString().trim();
if (!TextUtils.isEmpty(name)) {
updateFood(foodId, name, category, bestBefore);
b.dismiss();
}
}
});
buttonDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
deleteFood(foodId);
b.dismiss();
}
});
}
private boolean deleteFood(String id) {
//getting the specified artist reference
DatabaseReference dR = FirebaseDatabase.getInstance().getReference("foods").child(uid).child(id);
//removing artist
dR.removeValue();
//getting the tracks reference for the specified artist
DatabaseReference drNutritions = FirebaseDatabase.getInstance().getReference("nutritions").child(id);
//removing all tracks
drNutritions.removeValue();
Toast.makeText(getApplicationContext(), "Food Deleted", Toast.LENGTH_LONG).show();
return true;
}
以及食物添加的列表:
public class FoodList extends ArrayAdapter<Food> {
private Activity context;
List<Food> foods;
public FoodList(Activity context, List<Food> foods) {
super(context, R.layout.layout_food_list, foods);
this.context = context;
this.foods = foods;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View listViewItem = inflater.inflate(R.layout.layout_food_list, null, true);
TextView textViewName = (TextView) listViewItem.findViewById(R.id.textViewName);
TextView textViewCategory = (TextView) listViewItem.findViewById(R.id.textViewCategory);
TextView textViewDate = (TextView)listViewItem.findViewById(R.id.textViewDate);
Food food = foods.get(position);
textViewName.setText(food.getFoodName());
textViewCategory.setText(food.getFoodCategory());
textViewDate.setText(food.getBestBefore());
return listViewItem;
}
非常感谢您的帮助，我对此很陌生，谢谢
更新:我为最佳使用日期添加了代码，但是当我单击添加到数据库时，firebase 数据库正在添加 "android.support.v7.widget.AppCompatTextView{413768 V.ED.....。 ....... 0,235-720,273 #7f090004 app:id/DateText}"
而不是在 TextView 中输入的日期。
更新 2: 我进行了更改，现在这是我的 addFood 方法:
private void addFood() {
//getting the values to save
String name = editTextName.getText().toString().trim();
String category = spinnerCategory.getSelectedItem().toString();
String bestBefore = dateText.toString();
//checking if the value is provided
if (!TextUtils.isEmpty(name)) {
//getting a unique id using push().getKey() method
//it will create a unique id and we will use it as the Primary Key for our Artist
String id = databaseFoods.push().getKey();
//creating an Artist Object
// Food food = new Food(id, name, category, bestBefore);
//Saving the Artist
// databaseFoods.child(id).setValue(food);
Map<Object, String> food = new HashMap<>();
food.put("id", food.getId());
food.put("name", food.getName());
food.put("category", food.getCategory());
food.put("bestBefore", food.getbestBefore());
databaseFoods.child(id).push(map);
//setting edittext to blank again
editTextName.setText("");
//displaying a success toast
Toast.makeText(this, "food added", Toast.LENGTH_LONG).show();
} else {
//if the value is not given displaying a toast
Toast.makeText(this, "Please enter a food", Toast.LENGTH_LONG).show();
}
}
最佳答案
问题是这一行:
String bestBefore = dateText.toString();
您只是将现有的 TextView 转换为 String 而没有获取它的值。要获取该值，您应该使用:
String bestBefore = dateText.getText();
你可以保留之前的代码:
Food food = new Food(id, name, category, bestBefore);
//Saving the Artist
databaseFoods.child(id).setValue(food);
关于android - 将数据从 TextView 保存到 firebase 数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48731166/