Add RoomWordsWithUpdate

RoomWordsWithUpdate/app/.gitignore

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+/build

RoomWordsWithUpdate/app/build.gradle

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+/*
+ * Copyright (C) 2018 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.
+ */
+
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 27
+    defaultConfig {
+        applicationId "com.android.example.roomwordssampleupdate"
+        minSdkVersion 21
+        targetSdkVersion 27
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
+    implementation 'com.android.support:design:27.1.1'
+
+    // Room components
+    implementation "android.arch.persistence.room:runtime:$rootProject.roomVersion"
+    annotationProcessor "android.arch.persistence.room:compiler:$rootProject.roomVersion"
+
+    // Lifecycle components
+    implementation "android.arch.lifecycle:extensions:$rootProject.archLifecycleVersion"
+    annotationProcessor "android.arch.lifecycle:compiler:$rootProject.archLifecycleVersion"
+}

RoomWordsWithUpdate/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

RoomWordsWithUpdate/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+
+<!-- Copyright 2018 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. -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.example.roomwordssample">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity
+            android:name="com.android.example.roomwordssample.MainActivity"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name="com.android.example.roomwordssample.NewWordActivity"
+            android:label="@string/app_name" />
+    </application>
+
+</manifest>

RoomWordsWithUpdate/app/src/main/java/com/android/example/roomwordssample/MainActivity.java

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+/*
+ * Copyright (C) 2018 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.
+ */
+
+package com.android.example.roomwordssample;
+
+import android.arch.lifecycle.Observer;
+import android.arch.lifecycle.ViewModelProviders;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.design.widget.FloatingActionButton;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.Toolbar;
+import android.support.v7.widget.helper.ItemTouchHelper;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Toast;
+
+import java.util.List;
+
+/**
+ * This class displays a list of words in a RecyclerView.
+ * The words are saved in a Room database.
+ * The layout for this activity also displays a FAB that
+ * allows users to start the NewWordActivity to add new words.
+ * Users can delete a word by swiping it away, or delete all words
+ * through the Options menu.
+ * Whenever a new word is added, deleted, or updated, the RecyclerView
+ * showing the list of words automatically updates.
+ */
+public class MainActivity extends AppCompatActivity {
+
+    public static final int NEW_WORD_ACTIVITY_REQUEST_CODE = 1;
+    public static final int UPDATE_WORD_ACTIVITY_REQUEST_CODE = 2;
+
+    public static final String EXTRA_DATA_UPDATE_WORD = "extra_word_to_be_updated";
+    public static final String EXTRA_DATA_ID = "extra_data_id";
+
+    private WordViewModel mWordViewModel;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        // Set up the RecyclerView.
+        RecyclerView recyclerView = findViewById(R.id.recyclerview);
+        final WordListAdapter adapter = new WordListAdapter(this);
+        recyclerView.setAdapter(adapter);
+        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+
+        // Set up the WordViewModel.
+        mWordViewModel = ViewModelProviders.of(this).get(WordViewModel.class);
+        // Get all the words from the database
+        // and associate them to the adapter.
+        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);
+            }
+        });
+
+        // Floating action button setup
+        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);
+            }
+        });
+
+        // Add the functionality to swipe items in the
+        // RecyclerView to delete the swiped item.
+        ItemTouchHelper helper = new ItemTouchHelper(
+                new ItemTouchHelper.SimpleCallback(0,
+                        ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
+                    @Override
+                    // We are not implementing onMove() in this app.
+                    public boolean onMove(RecyclerView recyclerView,
+                                          RecyclerView.ViewHolder viewHolder,
+                                          RecyclerView.ViewHolder target) {
+                        return false;
+                    }
+
+                    @Override
+                    // When the use swipes a word,
+                    // delete that word from the database.
+                    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
+                        int position = viewHolder.getAdapterPosition();
+                        Word myWord = adapter.getWordAtPosition(position);
+                        Toast.makeText(MainActivity.this,
+                                getString(R.string.delete_word_preamble) + " " +
+                                myWord.getWord(), Toast.LENGTH_LONG).show();
+
+                        // Delete the word.
+                        mWordViewModel.deleteWord(myWord);
+                    }
+                });
+        // Attach the item touch helper to the recycler view.
+        helper.attachToRecyclerView(recyclerView);
+
+        adapter.setOnItemClickListener(new WordListAdapter.ClickListener()  {
+
+            @Override
+            public void onItemClick(View v, int position) {
+                Word word = adapter.getWordAtPosition(position);
+                launchUpdateWordActivity(word);
+            }
+        });
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.menu_main, menu);
+        return true;
+    }
+
+    // The options menu has a single item "Clear all data now"
+    // that deletes all the entries in the database.
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, as long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+
+        //noinspection SimplifiableIfStatement
+        if (id == R.id.clear_data) {
+            // Add a toast just for confirmation
+            Toast.makeText(this, R.string.clear_data_toast_text, Toast.LENGTH_LONG).show();
+
+            // Delete the existing data.
+            mWordViewModel.deleteAll();
+            return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    /**
+     * When the user enters a new word in the NewWordActivity,
+     * that activity returns the result to this activity.
+     * If the user entered a new word, save it in the database.
+
+     * @param requestCode ID for the request
+     * @param resultCode indicates success or failure
+     * @param data The Intent sent back from the NewWordActivity,
+     *             which includes the word that the user entered
+     */
+    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));
+            // Save the data.
+            mWordViewModel.insert(word);
+        } else if (requestCode == UPDATE_WORD_ACTIVITY_REQUEST_CODE
+                && resultCode == RESULT_OK) {
+            String word_data = data.getStringExtra(NewWordActivity.EXTRA_REPLY);
+            int id = data.getIntExtra(NewWordActivity.EXTRA_REPLY_ID, -1);
+
+            if (id != -1) {
+                mWordViewModel.update(new Word(id, word_data));
+            } else {
+                Toast.makeText(this, R.string.unable_to_update,
+                        Toast.LENGTH_LONG).show();
+            }
+        } else {
+            Toast.makeText(
+                    this, R.string.empty_not_saved, Toast.LENGTH_LONG).show();
+        }
+    }
+
+    public void launchUpdateWordActivity( Word word) {
+        Intent intent = new Intent(this, NewWordActivity.class);
+        intent.putExtra(EXTRA_DATA_UPDATE_WORD, word.getWord());
+        intent.putExtra(EXTRA_DATA_ID, word.getId());
+        startActivityForResult(intent, UPDATE_WORD_ACTIVITY_REQUEST_CODE);
+    }
+}