package com.example.android.roomwordssample; /* * Copyright (C) 2017 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Toast; import com.google.android.material.floatingactionbutton.FloatingActionButton; import java.util.List; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import androidx.appcompat.widget.Toolbar; import androidx.lifecycle.Observer; import androidx.lifecycle.ViewModelProvider; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; public class MainActivity extends AppCompatActivity { public static final int NEW_WORD_ACTIVITY_REQUEST_CODE = 1; private WordViewModel mWordViewModel; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); RecyclerView recyclerView = findViewById(R.id.recyclerview); final WordListAdapter adapter = new WordListAdapter(this); recyclerView.setAdapter(adapter); recyclerView.setLayoutManager(new LinearLayoutManager(this)); // Get a new or existing ViewModel from the ViewModelProvider. mWordViewModel = new ViewModelProvider(this).get(WordViewModel.class); // Add an observer on the LiveData returned by getAlphabetizedWords. // The onChanged() method fires when the observed data changes and the activity is // in the foreground. mWordViewModel.getAllWords().observe(this, new Observer<List<Word>>() { @Override public void onChanged(@Nullable final List<Word> words) { // Update the cached copy of the words in the adapter. adapter.setWords(words); } }); FloatingActionButton fab = findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent = new Intent(MainActivity.this, NewWordActivity.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) { Word word = new Word(data.getStringExtra(NewWordActivity.EXTRA_REPLY)); mWordViewModel.insert(word); } else { Toast.makeText( getApplicationContext(), R.string.empty_not_saved, Toast.LENGTH_LONG).show(); } } }