\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001Android\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3051\u308bLiveData\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u3088\u308a\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001Android ViewModel\u306b\u4e00\u5ea6\u3075\u3089\u3063\u3068\u7acb\u3061\u5bc4\u3063\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
LiveData\u306f\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u90e8\u3067\u3059\u3002\u57fa\u672c\u7684\u306b\u306f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\/\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u578b\u306e\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u30c7\u30fc\u30bf\u30db\u30eb\u30c0\u30fc\u3067\u3059\u3002LiveData\u306f\u30d3\u30e5\u30fc\u306e\u5909\u66f4\u3092\u89b3\u5bdf\u3057\u3001\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u5834\u5408\u306b\u30d3\u30e5\u30fc\u3092\u66f4\u65b0\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001LiveData\u306f\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u305f\u3061\u306fViewModel\u304cView\u306b\u30c7\u30fc\u30bf\u3092\u4f1d\u9054\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u3092\u77e5\u3063\u3066\u3044\u307e\u3059\u3002ViewModel\u306e\u307f\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u304c\u30d3\u30e5\u30fc\u306b\u53cd\u6620\u3055\u308c\u308b\u305f\u3073\u306b\u8907\u6570\u306e\u547c\u3073\u51fa\u3057\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u3001\u624b\u9593\u3068\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u7570\u306a\u308b\u5834\u6240\u306b\u683c\u7d0d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002LiveData\u306fObserver\u30d1\u30bf\u30fc\u30f3\u306b\u57fa\u3065\u3044\u3066\u304a\u308a\u3001ViewModel\u3068View\u306e\u9593\u306e\u901a\u4fe1\u3092\u5bb9\u6613\u306b\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u3092\u89b3\u5bdf\u3057\u3001\u8907\u6570\u306e\u5834\u6240\u304b\u3089\u306e\u30c7\u30fc\u30bf\u53c2\u7167\u306e\u8ffd\u52a0\u3084\u524a\u9664\u306b\u8907\u6570\u306e\u547c\u3073\u51fa\u3057\u3092\u884c\u3046\u4ee3\u308f\u308a\u306b\u3001\u30c7\u30fc\u30bf\u3092\u81ea\u52d5\u7684\u306b\u66f4\u65b0\u3057\u307e\u3059\uff08\u305f\u3068\u3048\u3070SQLite\u3001ArrayList\u3001ViewModel\u306a\u3069\u306e\u5834\u6240\uff09\u3002<\/p>\n
Android LiveData\u306f\u3001RxJava\u306b\u4f3c\u305f\u3082\u306e\u3067\u3059\u304c\u3001LiveData\u306f\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002\u3082\u3057View\u304c\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u306b\u3042\u308b\u5834\u5408\u3001LiveData\u306fView\u5185\u306e\u30c7\u30fc\u30bf\u3092\u66f4\u65b0\u3057\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001IllegalStateException\u306a\u3069\u306e\u4f8b\u5916\u3092\u56de\u907f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002ViewModel\u3067\u306eLiveData\u304cActivity\u306b\u3069\u306e\u3088\u3046\u306b\u66f4\u65b0\u3055\u308c\u308b\u306e\u304b\u306f\u3069\u3046\u3067\u3057\u3087\u3046\u304b\uff1fActivity\u3067Observer\u3092\u767b\u9332\u3059\u308b\u969b\u306b\u306f\u3001onChanged()\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002onChanged()\u30e1\u30bd\u30c3\u30c9\u306f\u3001LiveData\u304c\u5909\u66f4\u3055\u308c\u308b\u305f\u3073\u306b\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001onChanged()\u5185\u3067\u5909\u66f4\u3055\u308c\u305fLiveData\u3092View\u306b\u66f4\u65b0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
LiveData\u306f\u3001\u30c7\u30fc\u30bf\u304c\u5909\u66f4\u3055\u308c\u308b\u5ea6\u306b\u305d\u306e\u76e3\u8996\u8005\u306b\u901a\u77e5\u3059\u308b\u30c7\u30fc\u30bf\u578b\u3067\u3059\u3002LiveData\u306f\u3001\u30c7\u30fc\u30bf\u5909\u66f4\u306e\u901a\u77e5\u8005\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002<\/p>\n
LiveData\u306fsetValue()\u3068postValue()\u3092\u4f7f\u3063\u3066Observer\u306b\u901a\u77e5\u3057\u307e\u3059\u3002setValue()\u306f\u30e1\u30a4\u30f3\u30b9\u30ec\u30c3\u30c9\u4e0a\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002postValue()\u306f\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u30b9\u30ec\u30c3\u30c9\u4e0a\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002LiveData\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067getValue()\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u73fe\u5728\u306e\u30c7\u30fc\u30bf\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n
MutableLiveData\u306f\u3001LiveData\u578b\u306e\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3057\u305f\u30af\u30e9\u30b9\u3067\u3059\u3002MutableLiveData\u306f\u3001LiveData\u30af\u30e9\u30b9\u304c\u63d0\u4f9b\u3057\u306a\u3044postValue()\u30e1\u30bd\u30c3\u30c9\u3068setValue()\u30e1\u30bd\u30c3\u30c9\u3092\u516c\u958b\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u4e00\u822c\u7684\u306b\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002LiveData\/MutableLiveData\u306f\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u578b\uff08List\u3001ArrayList\u306a\u3069\uff09\u304b\u3089RecyclerView\u306e\u30c7\u30fc\u30bf\u3092\u66f4\u65b0\u3059\u308b\u969b\u306b\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001SQLite\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304b\u3089RecyclerView\u306b\u884c\u3092\u8ffd\u52a0\/\u524a\u9664\u3059\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002LiveData\u306e\u5909\u66f4\u6642\u306bRecyclerView\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u66f4\u65b0\u3059\u308b\u305f\u3081\u306bMutableLiveData\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u53e4\u3044ArrayList\u3068\u65b0\u3057\u3044ArrayList\u3092\u6bd4\u8f03\u3057\u3066\u3001\u6700\u5c0f\u9650\u306eRecyclerView\u884c\u3092\u66f4\u65b0\u3059\u308b\u305f\u3081\u306bDiffUtil\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u6b21\u306e\u5185\u5bb9\u3092\u3042\u306a\u305f\u306ebuild.gradle\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
implementation 'com.android.support:design:27.1.1'\r\nimplementation 'com.android.support:cardview-v7:27.1.1'\r\nimplementation 'android.arch.lifecycle:extensions:1.1.1'\r\n<\/code><\/pre>\n\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eLiveData\u30b3\u30fc\u30c9\u3092\u30d1\u30e9\u30d5\u30ec\u30fc\u30ba\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
\u4ee5\u4e0b\u306bactivity_main.xml\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30b3\u30fc\u30c9\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<android.support.design.widget.CoordinatorLayout xmlns:android=\"https:\/\/schemas.android.com\/apk\/res\/android\"\r\n xmlns:app=\"https:\/\/schemas.android.com\/apk\/res-auto\"\r\n xmlns:tools=\"https:\/\/schemas.android.com\/tools\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"match_parent\"\r\n tools:context=\".MainActivity\">\r\n\r\n <android.support.design.widget.AppBarLayout\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:theme=\"@style\/AppTheme.AppBarOverlay\">\r\n\r\n <android.support.v7.widget.Toolbar\r\n android:id=\"@+id\/toolbar\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"?attr\/actionBarSize\"\r\n android:background=\"?attr\/colorPrimary\"\r\n app:popupTheme=\"@style\/AppTheme.PopupOverlay\" \/>\r\n\r\n <\/android.support.design.widget.AppBarLayout>\r\n\r\n <RelativeLayout xmlns:android=\"https:\/\/schemas.android.com\/apk\/res\/android\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"match_parent\"\r\n app:layout_behavior=\"@string\/appbar_scrolling_view_behavior\">\r\n\r\n <android.support.v7.widget.RecyclerView\r\n android:id=\"@+id\/recyclerView\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"match_parent\" \/>\r\n\r\n <\/RelativeLayout>\r\n\r\n <android.support.design.widget.FloatingActionButton\r\n android:id=\"@+id\/fab\"\r\n android:layout_width=\"wrap_content\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_gravity=\"bottom|end\"\r\n android:layout_margin=\"@dimen\/fab_margin\"\r\n app:srcCompat=\"@android:drawable\/ic_input_add\" \/>\r\n\r\n<\/android.support.design.widget.CoordinatorLayout>\r\n<\/code><\/pre>\n\u4e0b\u8a18\u306flist_item_row.xml\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<android.support.v7.widget.CardView xmlns:android=\"https:\/\/schemas.android.com\/apk\/res\/android\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\">\r\n\r\n <RelativeLayout\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:padding=\"8dp\"\r\n android:gravity=\"center_vertical\">\r\n\r\n <TextView\r\n android:id=\"@+id\/tvUrl\"\r\n android:layout_width=\"wrap_content\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_alignParentStart=\"true\"\r\n android:autoLink=\"web\"\r\n android:padding=\"8dp\"\r\n android:textColor=\"@android:color\/black\"\r\n android:textSize=\"20sp\" \/>\r\n\r\n <TextView\r\n android:id=\"@+id\/tvDate\"\r\n android:layout_width=\"wrap_content\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_alignParentLeft=\"true\"\r\n android:layout_below=\"@+id\/tvUrl\" \/>\r\n\r\n <ImageButton\r\n android:id=\"@+id\/btnDelete\"\r\n android:layout_width=\"wrap_content\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_alignParentEnd=\"true\"\r\n android:layout_centerVertical=\"true\"\r\n android:src=\"@android:drawable\/ic_menu_delete\" \/>\r\n\r\n\r\n <\/RelativeLayout>\r\n\r\n\r\n<\/android.support.v7.widget.CardView>\r\n<\/code><\/pre>\nDbSettings.java\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
package com.scdev.androidlivedata.db;\r\n\r\nimport android.provider.BaseColumns;\r\n\r\npublic class DbSettings {\r\n\r\n public static final String DB_NAME = \"favourites.db\";\r\n public static final int DB_VERSION = 1;\r\n\r\n public class DBEntry implements BaseColumns {\r\n\r\n public static final String TABLE = \"fav\";\r\n public static final String COL_FAV_URL = \"url\";\r\n public static final String COL_FAV_DATE = \"date\";\r\n\r\n }\r\n}\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306bFavouritesDbHelper.java\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
package com.scdev.androidlivedata.db;\r\n\r\nimport android.content.Context;\r\nimport android.database.sqlite.SQLiteDatabase;\r\nimport android.database.sqlite.SQLiteOpenHelper;\r\n\r\npublic class FavouritesDBHelper extends SQLiteOpenHelper {\r\n\r\n public FavouritesDBHelper(Context context) {\r\n super(context, DbSettings.DB_NAME, null, DbSettings.DB_VERSION);\r\n }\r\n\r\n @Override\r\n public void onCreate(SQLiteDatabase db) {\r\n String createTable = \"CREATE TABLE \" + DbSettings.DBEntry.TABLE + \" ( \" +\r\n DbSettings.DBEntry._ID + \" INTEGER PRIMARY KEY AUTOINCREMENT, \" +\r\n DbSettings.DBEntry.COL_FAV_URL + \" TEXT NOT NULL, \" +\r\n DbSettings.DBEntry.COL_FAV_DATE + \" INTEGER NOT NULL);\";\r\n db.execSQL(createTable);\r\n }\r\n\r\n @Override\r\n public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {\r\n db.execSQL(\"DROP TABLE IF EXISTS \" + DbSettings.DBEntry.TABLE);\r\n onCreate(db);\r\n }\r\n\r\n}\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306b\u306f\u3001Favourites.java\u30e2\u30c7\u30eb\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u304c\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
package com.scdev.androidlivedata;\r\n\r\npublic class Favourites {\r\n\r\n public long mId;\r\n public String mUrl;\r\n public long mDate;\r\n\r\n public Favourites(long id, String name, long date) {\r\n mId = id;\r\n mUrl = name;\r\n mDate = date;\r\n }\r\n\r\n public Favourites(Favourites favourites) {\r\n mId = favourites.mId;\r\n mUrl = favourites.mUrl;\r\n mDate = favourites.mDate;\r\n }\r\n\r\n}\r\n<\/code><\/pre>\n\u79c1\u305f\u3061\u306eSQLite\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306f\u3001ID\u3001URL\u3001DATE\u306e3\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u6301\u3064\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002FavouritesViewModel.java\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n
package com.scdev.androidlivedata;\r\n\r\nimport android.app.Application;\r\nimport android.arch.lifecycle.AndroidViewModel;\r\nimport android.arch.lifecycle.MutableLiveData;\r\nimport android.content.ContentValues;\r\nimport android.database.Cursor;\r\nimport android.database.sqlite.SQLiteDatabase;\r\n\r\n\r\nimport com.scdev.androidlivedata.db.DbSettings;\r\nimport com.scdev.androidlivedata.db.FavouritesDBHelper;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class FavouritesViewModel extends AndroidViewModel {\r\n\r\n private FavouritesDBHelper mFavHelper;\r\n private MutableLiveData<List<Favourites>> mFavs;\r\n\r\n FavouritesViewModel(Application application) {\r\n super(application);\r\n mFavHelper = new FavouritesDBHelper(application);\r\n }\r\n\r\n public MutableLiveData<List<Favourites>> getFavs() {\r\n if (mFavs == null) {\r\n mFavs = new MutableLiveData<>();\r\n loadFavs();\r\n }\r\n\r\n return mFavs;\r\n }\r\n\r\n private void loadFavs() {\r\n List<Favourites> newFavs = new ArrayList<>();\r\n SQLiteDatabase db = mFavHelper.getReadableDatabase();\r\n Cursor cursor = db.query(DbSettings.DBEntry.TABLE,\r\n new String[]{\r\n DbSettings.DBEntry._ID,\r\n DbSettings.DBEntry.COL_FAV_URL,\r\n DbSettings.DBEntry.COL_FAV_DATE\r\n },\r\n null, null, null, null, null);\r\n while (cursor.moveToNext()) {\r\n int idxId = cursor.getColumnIndex(DbSettings.DBEntry._ID);\r\n int idxUrl = cursor.getColumnIndex(DbSettings.DBEntry.COL_FAV_URL);\r\n int idxDate = cursor.getColumnIndex(DbSettings.DBEntry.COL_FAV_DATE);\r\n newFavs.add(new Favourites(cursor.getLong(idxId), cursor.getString(idxUrl), cursor.getLong(idxDate)));\r\n }\r\n\r\n cursor.close();\r\n db.close();\r\n mFavs.setValue(newFavs);\r\n }\r\n\r\n\r\n public void addFav(String url, long date) {\r\n\r\n SQLiteDatabase db = mFavHelper.getWritableDatabase();\r\n ContentValues values = new ContentValues();\r\n values.put(DbSettings.DBEntry.COL_FAV_URL, url);\r\n values.put(DbSettings.DBEntry.COL_FAV_DATE, date);\r\n long id = db.insertWithOnConflict(DbSettings.DBEntry.TABLE,\r\n null,\r\n values,\r\n SQLiteDatabase.CONFLICT_REPLACE);\r\n db.close();\r\n\r\n\r\n List<Favourites> favourites = mFavs.getValue();\r\n\r\n ArrayList<Favourites> clonedFavs;\r\n if (favourites == null) {\r\n clonedFavs = new ArrayList<>();\r\n } else {\r\n clonedFavs = new ArrayList<>(favourites.size());\r\n for (int i = 0; i < favourites.size(); i++) {\r\n clonedFavs.add(new Favourites(favourites.get(i)));\r\n }\r\n }\r\n\r\n Favourites fav = new Favourites(id, url, date);\r\n clonedFavs.add(fav);\r\n mFavs.setValue(clonedFavs);\r\n }\r\n\r\n public void removeFav(long id) {\r\n SQLiteDatabase db = mFavHelper.getWritableDatabase();\r\n db.delete(\r\n DbSettings.DBEntry.TABLE,\r\n DbSettings.DBEntry._ID + \" = ?\",\r\n new String[]{Long.toString(id)}\r\n );\r\n db.close();\r\n\r\n List<Favourites> favs = mFavs.getValue();\r\n ArrayList<Favourites> clonedFavs = new ArrayList<>(favs.size());\r\n for (int i = 0; i < favs.size(); i++) {\r\n clonedFavs.add(new Favourites(favs.get(i)));\r\n }\r\n\r\n int index = -1;\r\n for (int i = 0; i < clonedFavs.size(); i++) {\r\n Favourites favourites = clonedFavs.get(i);\r\n if (favourites.mId == id) {\r\n index = i;\r\n }\r\n }\r\n if (index != -1) {\r\n clonedFavs.remove(index);\r\n }\r\n mFavs.setValue(clonedFavs);\r\n }\r\n\r\n}\r\n<\/code><\/pre>\nMutableLiveData\u306f\u3001Favourite\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u3092\u4fdd\u6301\u3057\u3066\u3044\u307e\u3059\u3002addFav()\u3068removeFav()\u3067\u306f\u3001MainActivity\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308bObserver\u306b\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u3092\u901a\u77e5\u3057\u307e\u3059\u3002\u53e4\u3044\u30ea\u30b9\u30c8\u3068\u65b0\u3057\u3044\u30ea\u30b9\u30c8\u3092\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u3001ArrayList\u306e\u30b3\u30d4\u30fc\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002MainActivity.java\u30af\u30e9\u30b9\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
package com.scdev.androidlivedata;\r\n\r\nimport android.arch.lifecycle.Observer;\r\nimport android.arch.lifecycle.ViewModelProviders;\r\nimport android.content.DialogInterface;\r\nimport android.os.Bundle;\r\nimport android.support.annotation.Nullable;\r\nimport android.support.design.widget.FloatingActionButton;\r\nimport android.support.v7.app.AlertDialog;\r\nimport android.support.v7.app.AppCompatActivity;\r\nimport android.support.v7.util.DiffUtil;\r\nimport android.support.v7.widget.LinearLayoutManager;\r\nimport android.support.v7.widget.RecyclerView;\r\nimport android.view.LayoutInflater;\r\nimport android.view.View;\r\nimport android.view.ViewGroup;\r\nimport android.widget.EditText;\r\nimport android.widget.ImageButton;\r\nimport android.widget.TextView;\r\n\r\nimport java.util.Date;\r\nimport java.util.List;\r\n\r\npublic class MainActivity extends AppCompatActivity {\r\n\r\n private FavAdapter mFavAdapter;\r\n private FavouritesViewModel mFavViewModel;\r\n private List<Favourites> mFav;\r\n FloatingActionButton fab;\r\n\r\n @Override\r\n protected void onCreate(Bundle savedInstanceState) {\r\n super.onCreate(savedInstanceState);\r\n setContentView(R.layout.activity_main);\r\n fab = findViewById(R.id.fab);\r\n final RecyclerView recyclerView = findViewById(R.id.recyclerView);\r\n recyclerView.setLayoutManager(new LinearLayoutManager(this));\r\n mFavViewModel = ViewModelProviders.of(this).get(FavouritesViewModel.class);\r\n final Observer<List<Favourites>> favsObserver = new Observer<List<Favourites>>() {\r\n @Override\r\n public void onChanged(@Nullable final List<Favourites> updatedList) {\r\n if (mFav == null) {\r\n mFav = updatedList;\r\n mFavAdapter = new FavAdapter();\r\n recyclerView.setAdapter(mFavAdapter);\r\n } else {\r\n DiffUtil.DiffResult result = DiffUtil.calculateDiff(new DiffUtil.Callback() {\r\n\r\n @Override\r\n public int getOldListSize() {\r\n return mFav.size();\r\n }\r\n\r\n @Override\r\n public int getNewListSize() {\r\n return updatedList.size();\r\n }\r\n\r\n @Override\r\n public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {\r\n return mFav.get(oldItemPosition).mId ==\r\n updatedList.get(newItemPosition).mId;\r\n }\r\n\r\n @Override\r\n public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {\r\n Favourites oldFav = mFav.get(oldItemPosition);\r\n Favourites newFav = updatedList.get(newItemPosition);\r\n return oldFav.equals(newFav);\r\n }\r\n });\r\n result.dispatchUpdatesTo(mFavAdapter);\r\n mFav = updatedList;\r\n }\r\n }\r\n };\r\n\r\n fab.setOnClickListener(new View.OnClickListener() {\r\n @Override\r\n public void onClick(View view) {\r\n final EditText inUrl = new EditText(MainActivity.this);\r\n AlertDialog dialog = new AlertDialog.Builder(MainActivity.this)\r\n .setTitle(\"New favourite\")\r\n .setMessage(\"Add a url link below\")\r\n .setView(inUrl)\r\n .setPositiveButton(\"Add\", new DialogInterface.OnClickListener() {\r\n @Override\r\n public void onClick(DialogInterface dialog, int which) {\r\n String url = String.valueOf(inUrl.getText());\r\n long date = (new Date()).getTime();\r\n\r\n mFavViewModel.addFav(url, date);\r\n }\r\n })\r\n .setNegativeButton(\"Cancel\", null)\r\n .create();\r\n dialog.show();\r\n }\r\n });\r\n\r\n mFavViewModel.getFavs().observe(this, favsObserver);\r\n }\r\n\r\n\r\n public class FavAdapter extends RecyclerView.Adapter<FavAdapter.FavViewHolder> {\r\n\r\n @Override\r\n public FavViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {\r\n View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_row, parent, false);\r\n return new FavViewHolder(itemView);\r\n }\r\n\r\n @Override\r\n public void onBindViewHolder(FavViewHolder holder, int position) {\r\n Favourites favourites = mFav.get(position);\r\n holder.mTxtUrl.setText(favourites.mUrl);\r\n holder.mTxtDate.setText((new Date(favourites.mDate).toString()));\r\n }\r\n\r\n @Override\r\n public int getItemCount() {\r\n return mFav.size();\r\n }\r\n\r\n class FavViewHolder extends RecyclerView.ViewHolder {\r\n\r\n TextView mTxtUrl;\r\n TextView mTxtDate;\r\n\r\n FavViewHolder(View itemView) {\r\n super(itemView);\r\n mTxtUrl = itemView.findViewById(R.id.tvUrl);\r\n mTxtDate = itemView.findViewById(R.id.tvDate);\r\n ImageButton btnDelete = itemView.findViewById(R.id.btnDelete);\r\n btnDelete.setOnClickListener(new View.OnClickListener() {\r\n @Override\r\n public void onClick(View view) {\r\n int pos = getAdapterPosition();\r\n Favourites favourites = mFav.get(pos);\r\n mFavViewModel.removeFav(favourites.mId);\r\n }\r\n });\r\n }\r\n }\r\n }\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u6d3b\u52d5\u306e\u4e2d\u3067ReyclerView\u306e\u30a2\u30c0\u30d7\u30bf\u30fc\u30af\u30e9\u30b9\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002mFavViewModel.getFavs().observe(this, favsObserver);\u306f\u3001LiveData\u304c\u66f4\u65b0\u3055\u308c\u308b\u305f\u3073\u306bViewModel\u30af\u30e9\u30b9\u304b\u3089\u901a\u77e5\u3055\u308c\u308bMainActivity\u306bObserver\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002favsObserver\u533f\u540d\u30af\u30e9\u30b9\u306b\u306fonChanged()\u30e1\u30bd\u30c3\u30c9\u304c\u542b\u307e\u308c\u3066\u304a\u308a\u3001\u6700\u65b0\u306e\u30c7\u30fc\u30bf\u304c\u63d0\u4f9b\u3055\u308c\u3001\u305d\u308c\u304cRecyclerView\u3067\u66f4\u65b0\u3055\u308c\u307e\u3059\u3002\u4e0a\u8a18\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002\u3053\u308c\u3067Android LiveData\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306f\u7d42\u4e86\u3067\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306f\u4ee5\u4e0b\u306e\u30ea\u30f3\u30af\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u300cAndroidLiveData\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u300d<\/p>\n
\u79c1\u305f\u3061\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089Android Studio\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30b3\u30fc\u30c9\u3082\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001Android\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3051\u308bLiveData\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u3088\u308a\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001Android ViewModel\u306b\u4e00\u5ea6\u3075\u3089\u3063\u3068\u7acb\u3061\u5bc4 […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-555","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eLiveData - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eLiveData\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306elivedata\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eLiveData\" \/>\n<meta property=\"og:description\" content=\"\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306eLiveData\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/\u30a2\u30f3\u30c9\u30ed\u30a4\u30c9\u306elivedata\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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