イーサン・ビアズリー：
割り当てのために私は、ダイアログボックス内の2つのオプションを提示しています。このクリックで、リサイクル業者ビューのクリックを使用する必要があります。これらは、編集＆削除されています。基本的に私の問題は、私は、クリックの位置を取得する方法がわからないです。だから私は、そのレシピ（クラス名）の詳細を取得することはできません。これは割り当てが使用することを言うことであると私は> LiveDataを使用していました。
問題私が持っは、以下のとおりです。1.私はレシピクラスから正しいのレシピを取得する位置を使用する方法がわかりません。2.私は、リストを使用する必要がないのArrayList
ここに私の主な活動クラスです
public class MainActivity extends AppCompatActivity implements RecipeListAdapter.OnItemClickListener {
private RecipeViewModel mRecipeViewModel;
public static final int NEW_WORD_ACTIVITY_REQUEST_CODE = 1;
public String Name;
public String Ingredients;
public String Method;
private RecipeListAdapter mAdapter;
private RecipeDao recDao;
private LiveData<List<Recipe>> RecipeList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = findViewById(R.id.recyclerview);
final RecipeListAdapter adapter = new RecipeListAdapter(this);
recyclerView.setAdapter(adapter);
adapter.setOnItemClickListener(MainActivity.this);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecipeViewModel = new ViewModelProvider(this).get(RecipeViewModel.class);
mRecipeViewModel.getAllRecipes().observe(this, new Observer<List<Recipe>>() {
@Override
public void onChanged(@Nullable final List<Recipe> recipes) {
// Update the cached copy of the words in the adapter.
adapter.setWords(recipes);
}
});
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, newRecipeActivity.class);
startActivityForResult(intent, NEW_WORD_ACTIVITY_REQUEST_CODE);
}
});
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == NEW_WORD_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
Recipe recipe = new Recipe(data.getStringExtra(newRecipeActivity.EXTRA_REPLY));
RecipeViewModel.insert(recipe);
} else {
Toast.makeText(
getApplicationContext(),
R.string.empty_not_saved,
Toast.LENGTH_LONG).show();
}
}
@Override
public void onItemClick(int position) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
alertDialog.setTitle("Edit or Delete...");
alertDialog.setPositiveButton("Edit", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent update = new Intent(MainActivity.this, UpdateRecipeActivity.class);
startActivity(update);
}
});
alertDialog.setNegativeButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Delete
}
});
alertDialog.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});
alertDialog.show();
}
}
ここに私のアダプタクラスがあります
public class RecipeListAdapter extends
RecyclerView.Adapter<RecipeListAdapter.RecipeViewHolder> {
private OnItemClickListener mListener;
private LiveData<List<Recipe>> recipeList;
public interface OnItemClickListener{
void onItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener){
mListener = listener;
}
class RecipeViewHolder extends RecyclerView.ViewHolder {
private final TextView recipeItemView;
private RecipeViewHolder(View itemView) {
super(itemView);
recipeItemView = itemView.findViewById(R.id.textView);
itemView.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
if (mListener != null){
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION){
mListener.onItemClick(position);
}
}
}
});
}
}
private final LayoutInflater mInflater;
private List<Recipe> mRecipes; // Cached copy of words
RecipeListAdapter(Context context) {
mInflater = LayoutInflater.from(context);
this.recipeList = recipeList;
}
@Override
public RecipeViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = mInflater.inflate(R.layout.recyclerview_item, parent, false);
return new RecipeViewHolder(itemView);
}
@Override
public void onBindViewHolder(RecipeViewHolder holder, int position) {
if (mRecipes != null) {
Recipe current = mRecipes.get(position);
holder.recipeItemView.setText(current.getName());
} else {
// Covers the case of data not being ready yet.
holder.recipeItemView.setText("No Recipes");
}
}
void setWords(List<Recipe> recipes){
mRecipes = recipes;
notifyDataSetChanged();
}
// getItemCount() is called many times, and when it is first called,
// mWords has not been updated (means initially, it's null, and we can't return null).
@Override
public int getItemCount() {
if (mRecipes != null)
return mRecipes.size();
else return 0;
}
public interface OnNoteListener{}
}ここに私のビューモデルクラスです
public class RecipeViewModel extends AndroidViewModel {
private static RecipeRepository repo;
private LiveData<List<Recipe>> mAllRecipes;
public RecipeViewModel(Application application){
super(application);
repo = new RecipeRepository(application);
mAllRecipes = repo.getAllRecipes();
}
LiveData<List<Recipe>> getAllRecipes() { return mAllRecipes; }
public static void insert(Recipe recipe) { repo.insert(recipe);}
public void getRecipe(int position) {
}
}
ADARSH Yashvanth：
リスト内の宣言 MainActivity
List<Recipe> recipesList = new ArrayList<>();
あなたのレシピで、そのリストを初期化
mRecipeViewModel.getAllRecipes().observe(this, new Observer<List<Recipe>>() {
@Override
public void onChanged(@Nullable final List<Recipe> recipes) {
recipesList = recipes; //init here
adapter.setWords(recipes);
}
});
使用位置は、編集または削除する特定の項目を取得します
@Override
public void onItemClick(int position) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
alertDialog.setTitle("Edit or Delete...");
alertDialog.setPositiveButton("Edit", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
recipesList.get(position); //returns the clicked item
Intent update = new Intent(MainActivity.this, UpdateRecipeActivity.class);
startActivity(update);
}
});
alertDialog.setNegativeButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//Delete
recipesList.get(position); //returns the clicked item
}
});
alertDialog.setNeutralButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});
alertDialog.show();
}