\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bbaAndroid\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684LiveData\u67b6\u6784\u7ec4\u4ef6\u3002\u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3\u672c\u6559\u7a0b\uff0c\u5efa\u8bae\u5148\u5feb\u901f\u4e86\u89e3\u4e00\u4e0bAndroid ViewModel\u3002<\/p>\n
LiveData\u57fa\u672c\u4e0a\u662f\u4e00\u4e2a\u5305\u542b\u539f\u59cb\u7c7b\u578b\u6216\u96c6\u5408\u7c7b\u578b\u7684\u6570\u636e\u6301\u6709\u8005\u3002\u5b83\u7528\u4e8e\u89c2\u5bdf\u89c6\u56fe\u7684\u53d8\u5316\uff0c\u5e76\u5728\u89c6\u56fe\u5904\u4e8e\u6d3b\u52a8\u72b6\u6001\u65f6\u66f4\u65b0\u89c6\u56fe\u3002\u56e0\u6b64\uff0cLiveData\u662f\u5177\u6709\u751f\u547d\u5468\u671f\u611f\u77e5\u80fd\u529b\u7684\u3002\u6211\u4eec\u77e5\u9053ViewModel\u7528\u4e8e\u5c06\u6570\u636e\u4f20\u9012\u7ed9View\u3002\u4ec5\u4f7f\u7528ViewModel\u53ef\u80fd\u662f\u4e00\u9879\u7e41\u7410\u4e14\u6602\u8d35\u7684\u64cd\u4f5c\uff0c\u56e0\u4e3a\u6bcf\u6b21\u6570\u636e\u9700\u8981\u6539\u53d8\u89c6\u56fe\u65f6\uff0c\u6211\u4eec\u90fd\u9700\u8981\u8fdb\u884c\u591a\u4e2a\u8c03\u7528\u3002\u6b64\u5916\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u5728\u4e0d\u540c\u7684\u4f4d\u7f6e\u5b58\u50a8\u6570\u636e\u6a21\u578b\u3002LiveData\u57fa\u4e8e\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u4f7f\u5f97ViewModel\u548cView\u4e4b\u95f4\u7684\u901a\u4fe1\u53d8\u5f97\u7b80\u5355\u3002\u5b83\u4f1a\u89c2\u5bdf\u6570\u636e\u7684\u53d8\u5316\uff0c\u5e76\u81ea\u52a8\u66f4\u65b0\u6570\u636e\uff0c\u800c\u4e0d\u662f\u6211\u4eec\u5728\u591a\u4e2a\u4f4d\u7f6e\u8fdb\u884c\u591a\u6b21\u6dfb\u52a0\u548c\u5220\u9664\u6570\u636e\u5f15\u7528\u7684\u8c03\u7528\uff08\u4f8b\u5982SQLite\uff0cArrayList\uff0cViewModel\uff09\u3002<\/p>\n
Android LiveData\u4e0eRxJava\u76f8\u4f3c\uff0c\u4e0d\u8fc7LiveData\u5177\u6709\u751f\u547d\u5468\u671f\u611f\u77e5\u80fd\u529b\u3002\u5982\u679c\u89c6\u56fe\u5904\u4e8e\u540e\u53f0\uff0c\u5b83\u4e0d\u4f1a\u5728\u89c6\u56fe\u4e2d\u66f4\u65b0\u6570\u636e\uff0c\u4ece\u800c\u5e2e\u52a9\u6211\u4eec\u907f\u514d\u4e86IllegalStateException\u7b49\u5f02\u5e38\u3002\u5728ViewModel\u4e2d\uff0c\u6211\u4eec\u5982\u4f55\u66f4\u65b0Activity\u4e2d\u7684LiveData\uff1f\u5f53\u6211\u4eec\u5728Activity\u4e2d\u6ce8\u518cObserver\u65f6\uff0c\u9700\u8981\u8986\u5199onChanged()\u65b9\u6cd5\u3002\u5f53LiveData\u53d1\u751f\u53d8\u5316\u65f6\uff0conChanged()\u65b9\u6cd5\u4f1a\u88ab\u89e6\u53d1\u3002\u56e0\u6b64\uff0c\u5728onChanged()\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u53d8\u5316\u7684LiveData\u66f4\u65b0\u5230\u89c6\u56fe\u4e2d\u3002<\/p>\n
LiveData\u662f\u4e00\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5f53\u6570\u636e\u53d1\u751f\u53d8\u5316\u65f6\u4f1a\u901a\u77e5\u5176\u89c2\u5bdf\u8005\u3002LiveData\u5c31\u50cf\u4e00\u4e2a\u6570\u636e\u53d8\u5316\u7684\u901a\u77e5\u5668\u3002<\/p>\n
LiveData\u901a\u8fc7\u8c03\u7528setValue()\u548cpostValue()\u6765\u901a\u77e5\u89c2\u5bdf\u8005\u3002setValue()\u5728\u4e3b\u7ebf\u7a0b\u4e0a\u8fd0\u884c\uff0c\u800cpostValue()\u5728\u540e\u53f0\u7ebf\u7a0b\u4e0a\u8fd0\u884c\u3002\u8c03\u7528LiveData\u7c7b\u578b\u5b9e\u4f8b\u7684getValue()\u4f1a\u8fd4\u56de\u5f53\u524d\u6570\u636e\u3002<\/p>\n
MutableLiveData\u53ea\u662f\u4e00\u4e2a\u6269\u5c55\u4e86LiveData\u7c7b\u578b\u7684\u7c7b\u3002MutableLiveData\u5e38\u7528\uff0c\u56e0\u4e3a\u5b83\u516c\u5f00\u63d0\u4f9b\u4e86postValue()\u548csetValue()\u65b9\u6cd5\uff0c\u800cLiveData\u7c7b\u5e76\u4e0d\u63d0\u4f9b\u3002LiveData\/MutableLiveData\u5728\u4ece\u96c6\u5408\u7c7b\u578b\uff08List\u3001ArrayList\u7b49\uff09\u66f4\u65b0RecyclerView\u4e2d\u7684\u6570\u636e\u65f6\u5e38\u7528\u3002\u5728\u63a5\u4e0b\u6765\u7684\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\uff0c\u4eceSQLite\u6570\u636e\u5e93\u4e2d\u6dfb\u52a0\/\u5220\u9664RecyclerView\u4e2d\u7684\u884c\u3002\u6211\u4eec\u5c06\u4f7f\u7528MutableLiveData\uff0c\u4ee5\u4fbf\u5728LiveData\u66f4\u6539\u65f6\u66f4\u65b0RecyclerView\u8bb0\u5f55\u3002\u6211\u4eec\u5c06\u4f7f\u7528DiffUtil\u901a\u8fc7\u6bd4\u8f83\u65e7\u7684\u548c\u65b0\u7684ArrayList\u6765\u66f4\u65b0\u6700\u5c11\u6570\u91cf\u7684RecyclerView\u884c\u3002<\/p>\n
\u5728\u4f60\u7684build.gradle\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/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\u5b89\u5353LiveData\u4ee3\u7801<\/h3>\n
\u8fd9\u662f\u6587\u7ae0\u300aAndroid LiveData \u53ef\u4ee5\u88ab\u7b80\u5355\u5730\u63cf\u8ff0\u4e3a”\u5728\u7ec4\u4ef6\u4e4b\u95f4\u5171\u4eab\u6570\u636e”\uff0c\u5b83\u662f\u4e00\u79cd\u7528\u4e8e\u6784\u5efa\u54cd\u5e94\u5f0f\u3001\u4ee5\u6570\u636e\u9a71\u52a8\u7684 Android \u5e94\u7528\u7a0b\u5e8f\u7684\u5e93\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51712\u90e8\u5206\uff09\u3002<\/p>\n
\u4ee5\u4e0b\u662factivity_main.xml\u5e03\u5c40\u7684\u4ee3\u7801\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\u4ee5\u4e0b\u662flist_item_row.xml\u5e03\u5c40\u7684\u4ee3\u7801:<\/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>\n\u4e0b\u9762\u63d0\u4f9b\u4e86DbSettings.java\u7c7b\u7684\u4ee3\u7801\u3002<\/p>\n
package com.Olivia.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\u662fFavoritesDbHelper.java\u7c7b\u7684\u4ee3\u7801\uff1a<\/p>\n
package com.Olivia.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\u662fFavourites.java\u6a21\u578b\u7c7b\u7684\u4ee3\u7801\u3002<\/p>\n
package com.Olivia.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\u56e0\u6b64\uff0c\u5728\u6211\u4eec\u7684SQLite\u6570\u636e\u5e93\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b\u4e09\u6761\u8bb0\u5f55\u7684\u8868\uff1aID\u3001URL\u548cDATE\u3002\u4e0b\u9762\u662fFavouritesViewModel.java\u7c7b\u7684\u4ee3\u7801\u3002<\/p>\n
package com.Olivia.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.Olivia.androidlivedata.db.DbSettings;\r\nimport com.Olivia.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\u4fdd\u5b58\u4e86\u4e00\u4e2a\u6536\u85cf\u9879\u5b9e\u4f8b\u5bf9\u8c61\u5217\u8868\u3002\u5728addFav\uff08\uff09\u548cremoveFav\uff08\uff09\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u4f1a\u901a\u77e5\u6570\u636e\u53d8\u5316\u7ed9\u5728MainActivity\u4e2d\u5b9a\u4e49\u7684\u89c2\u5bdf\u5668\uff08Observer\uff09\u3002\u4e3a\u4e86\u6bd4\u8f83\u65e7\u7684\u5217\u8868\u548c\u65b0\u7684\u5217\u8868\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2aArrayList\u7684\u526f\u672c\u3002MainActivity.java\u7c7b\u7684\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
package com.Olivia.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(\"\u65b0\u5efa\u6536\u85cf\")\r\n .setMessage(\"\u8bf7\u5728\u4e0b\u65b9\u6dfb\u52a0\u7f51\u5740\u94fe\u63a5\")\r\n .setView(inUrl)\r\n .setPositiveButton(\"\u6dfb\u52a0\", 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(\"\u53d6\u6d88\", 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\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5df2\u7ecf\u5728Activity\u672c\u8eab\u4e2d\u5b9a\u4e49\u4e86RecyclerView\u9002\u914d\u5668\uff08Adapter\uff09\u7c7b\u3002mFavViewModel.getFavs().observe(this, favsObserver);\u7528\u4e8e\u5728MainActivity\u4e2d\u8bbe\u7f6e\u4e00\u4e2a\u89c2\u5bdf\u5668\uff0c\u6bcf\u5f53ViewModel\u7c7b\u66f4\u65b0LiveData\u65f6\uff0c\u8be5\u89c2\u5bdf\u5668\u5c06\u88ab\u901a\u77e5\u3002favsObserver\u533f\u540d\u7c7b\u7531onChanged()\u65b9\u6cd5\u7ec4\u6210\uff0c\u8be5\u65b9\u6cd5\u63d0\u4f9b\u6700\u65b0\u7684\u6570\u636e\uff0c\u7136\u540e\u5c06\u5176\u66f4\u65b0\u5230RecyclerView\u4e2d\u3002\u4e0a\u8ff0\u5e94\u7528\u7a0b\u5e8f\u7684\u8f93\u51fa\u5982\u4e0b\u6240\u793a\u3002\u8fd9\u6807\u5fd7\u7740Android LiveData\u6559\u7a0b\u7684\u7ed3\u675f\u3002\u60a8\u53ef\u4ee5\u4ece\u4e0b\u9762\u7684\u94fe\u63a5\u4e0b\u8f7d\u9879\u76ee\u3002<\/p>\n
\u4e0b\u8f7d AndroidLiveData \u9879\u76ee\u3002<\/p>\n
\u4f60\u4e5f\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u4ee3\u7801\u5e93\u4e2d\u68c0\u67e5Android Studio\u9879\u76ee\u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bbaAndroid\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684LiveData\u67b6\u6784\u7ec4\u4ef6\u3002\u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3\u672c\u6559\u7a0b\uff0c\u5efa\u8bae\u5148\u5feb\u901f\u4e86\u89e3 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[900,1914,1248,757,1915],"class_list":{"0":"post-692","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-android","9":"tag-livedata","10":"tag-757","11":"tag-1915"},"yoast_head":"\n
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