我正在尝试创建一个代码,说明“如果登录的用户名与创建的食谱的用户名匹配,则仅在我的 MyRecipes.java Activity 的 recyclerview 中显示这些数据库条目”。我无法确定将这个潜在声明放在哪里。看看我的代码,如果或否则,您会将该语句放在哪里?
userLoggedIn 和loggingUser 是当前登录用户的变量。
thisUser 是我在 recyclerview.java 类中填充 recyclerview 时从数据库中提取的用户设置的。
任何帮助将不胜感激!
RecyclerView.java类
private static String thisUser;
String userLoggedIn = HomeActivity.getUserLogged();
private Context mContext;
private RecipesAdapter mRecipeAdapter;
public void setConfig (RecyclerView recyclerView, Context context, List<Recipes> recipes, List<String> keys){
mContext = context;
mRecipeAdapter = new RecipesAdapter(recipes, keys);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.setAdapter(mRecipeAdapter);
}
class RecipeItemView extends RecyclerView.ViewHolder{
private TextView mTitle;
private TextView mIngredients;
private TextView mMethod;
private TextView mUser;
private String key;
public RecipeItemView(ViewGroup parent){
super(LayoutInflater.from(mContext).inflate(R.layout.recipe_list_item, parent,false));
mTitle = (TextView) itemView.findViewById(R.id.tvTitle);
mMethod = (TextView) itemView.findViewById(R.id.tvMethod);
mIngredients = (TextView) itemView.findViewById(R.id.tvIngredients);
mUser = (TextView) itemView.findViewById(R.id.tvUser);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(mContext, RecipeDetails.class);
intent.putExtra("key", key);
intent.putExtra("title", mTitle.getText().toString());
intent.putExtra("ingredients", mIngredients.getText().toString());
intent.putExtra("method", mMethod.getText().toString());
mContext.startActivity(intent);
}
});
}
public void bind(Recipes recipes, String key) {
mTitle.setText(recipes.getTitle());
mIngredients.setText(recipes.getIngredients());
mMethod.setText(recipes.getMethod());
mUser.setText(recipes.getCreatedUser());
thisUser = mUser.getText().toString().trim();
this.key = key;
}
}
public static String getUserLoggedIn(){
return thisUser;
}
class RecipesAdapter extends RecyclerView.Adapter<RecipeItemView> {
private List<Recipes> mRecipeList;
private List<String> mKeys;
public RecipesAdapter(List<Recipes> mRecipeList, List<String> mKeys) {
this.mRecipeList = mRecipeList;
this.mKeys = mKeys;
}
@NonNull
@Override
public RecipeItemView onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return new RecipeItemView(parent);
}
@Override
public void onBindViewHolder(@NonNull RecipeItemView holder, int position) {
holder.bind(mRecipeList.get(position), mKeys.get(position));
}
@Override
public int getItemCount() {
return mRecipeList.size();
}
}
}
MyRecipes.java(回收器 View 填充并显示所有食谱)
String loggedUser = HomeActivity.getUserLogged();
String thisUser = RecyclerViewConfig.getUserLoggedIn();
Button addRecipes;
private RecyclerView mRecyclerView;
private String passedUsername;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_recipes);
passedUsername = getIntent().getStringExtra("loggedUsername1");
mRecyclerView = (RecyclerView) findViewById(R.id.rvRecipes);
new FirebaseDatabaseHelper().readRecipes(new FirebaseDatabaseHelper.DataStatus() {
@Override
public void DataIsLoaded(List<Recipes> recipes, List<String> keys) {
new RecyclerViewConfig().setConfig(mRecyclerView, MyRecipesActivity.this, recipes, keys);
}
@Override
public void DataIsInserted() {
}
@Override
public void DataIsUpdated() {
}
@Override
public void DataIsDeleted() {
}
});
addRecipes = findViewById(R.id.btnAddNewRecipe);
addRecipes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent addrecipe = new Intent(MyRecipesActivity.this, AddRecipes.class);
addrecipe.putExtra("loggedUsername2", passedUsername);
startActivity(addrecipe);
}
});
}
}
最佳答案
如果我理解正确的话,只有当用户是创建菜谱的人时,您才需要向用户显示菜谱吗?假设,对代码进行以下更改即可解决问题。
如下更改您的bind()方法。
public void bind(Recipes recipes, String key) {
thisUser = mUser.getText().toString().trim();
if(thisUser.equals(recipes.getCreatedUser)) {
mTitle.setText(recipes.getTitle());
mIngredients.setText(recipes.getIngredients());
mMethod.setText(recipes.getMethod());
mUser.setText(recipes.getCreatedUser());
this.key = key;
}
}
虽然这是一种幼稚的方法,但更好的方法是当您使用 readRecipes() 方法本身从 Firebase 加载数据时,使用创建的用户过滤食谱列表。为此,可以使用如下查询(根据您的数据库结构,下面的确切查询可能不适用于您。根据需要进行更改)
Query query = reference.child("Recipes").orderByChild("userCreated").equalTo(thisUser);
关于java - Android:传递允许 recyclerview 由特定字符串填充的变量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59739638/