我想将一些物品发送到第二个活动的回收站视图。 我怎么能用房间做到这一点

Question

我用 RecyclerView、LiveData 和 Room 创建了一个简单的应用程序（我认为是这样）。 您可以在 GitHubMyProject中查看我的整个项目

我有主活动，那里有一个带有 TextView 的单词计数器，两个用于检查单词的按钮，并在每次单击后将其发送到另一个活动。 当我打开第二个活动（YesList）时，我什么也看不到。 那里是空的。 我该如何解决？

屏幕

    public class MainActivity extends AppCompatActivity {
    public static final String EXTRA_YES = "com.saturnpro.wcounter.YES";
    public static final String EXTRA_NO = "com.saturnpro.wcounter.NO";
    public static final int NEW_WORD_ACTIVITY_REQUEST_CODE = 1;
    private TextView text;
    private TextView counterTxt;
    List<String> words;
    int count = 0;
    int i = 0;
    Intent intentYes;
    Intent intentNo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text = findViewById(R.id.txt);
        counterTxt = findViewById(R.id.countertext);
        words = new ArrayList<>();
        words.add("hello");
        words.add("hi");
        words.add("cat");
        words.add("dog");
        words.add("drink");
        words.add("planet");
        words.add("space");
        words.add("kind");
        text.setText(words.get(0));
        counterTxt.setText(count+"");
        intentYes = new Intent(MainActivity.this, YesList.class);
        intentNo = new Intent(MainActivity.this, NoList.class);
    }

    public void addToYesList(View view) {
        i++;
        if(i < words.size()) {
            String word = words.get(i);
            text.setText(word);
            count++;
            counterTxt.setText(count+"");
            Intent replyIntent = new Intent();
            if (TextUtils.isEmpty(word)) {
                setResult(RESULT_CANCELED, replyIntent);
            } else {
                replyIntent.putExtra(EXTRA_YES, word);
                setResult(RESULT_OK, replyIntent);
            }
        }
        else {
            text.setText("Слов больше нет");
        }
    }

    public void addToNoList(View view) {
        i++;
        if (i < words.size()) {
            String word = words.get(i);
            text.setText(word);
        }
        else {
            text.setText("Слов больше нет");
        }
    }

    public void iknow(View view) {
        startActivityForResult(intentYes, NEW_WORD_ACTIVITY_REQUEST_CODE);
    }

    public void idontknow(View view) {
        startActivity(intentNo);
    }
}

第二个活动 YesList。

public class YesList extends AppCompatActivity {
    private WordViewModel mWordViewModel;
    public static final int NEW_WORD_ACTIVITY_REQUEST_CODE = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_yes_list);
        RecyclerView recyclerViewYes = findViewById(R.id.listYes);
        final WordListAdapter adapter = new WordListAdapter(new WordListAdapter.WordDiff());
        recyclerViewYes.setAdapter(adapter);
        recyclerViewYes.setLayoutManager(new LinearLayoutManager(this));
       // mWordViewModel = new ViewModelProvider(this).get(WordViewModel.class);

        mWordViewModel = new ViewModelProvider(this, ViewModelProvider.AndroidViewModelFactory.getInstance(getApplication())).get(WordViewModel.class);

        mWordViewModel.getAllWords().observe(this, words -> {
            // Update the cached copy of the words in the adapter.
            adapter.submitList(words);
        });

    }


    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == NEW_WORD_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
            Words word = new Words(data.getStringExtra(MainActivity.EXTRA_YES));
            mWordViewModel.insert(word);
            Log.d("proverka", mWordViewModel.toString());
        } else {
            Toast.makeText(
                    getApplicationContext(),
                    R.string.empty_not_saved,
                    Toast.LENGTH_LONG).show();
        }
    }
}

Answer 1

我认为您可以使用接口，因此recyclerview Item的onclick可以将数据从一个活动回收器发送到另一个活动回收器并将数据捕获到onBindViewHolder中。

我添加了代码片段，这样你就可以获得一些想法，

public void onBindViewHolder(ContactsAdapter.ViewHolder holder, int position)     {
    // Get the data model based on position
    Contact contact = mContacts.get(position);

    // Set item views based on your views and data model
        TextView textView = holder.nameTextView;

        textView.setText(contact.getName());
        Button button = holder.messageButton;
        button.setText(contact.isOnline() ?     "Message" : "Offline");
        button.setEnabled(contact.isOnline());
    }