Java tutorial
/* * Copyright 2017 Sudhir Khanger * * 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.sudhirkhanger.andpress.ui; import android.appwidget.AppWidgetManager; import android.content.ComponentName; import android.content.ContentProviderOperation; import android.content.Intent; import android.content.OperationApplicationException; import android.database.Cursor; import android.os.Bundle; import android.os.RemoteException; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; 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.util.Log; import android.view.Menu; import android.view.MenuItem; import android.widget.Toast; import com.google.android.gms.ads.AdRequest; import com.google.android.gms.ads.AdView; import com.sudhirkhanger.andpress.R; import com.sudhirkhanger.andpress.adapter.WordPressPostAdapter; import com.sudhirkhanger.andpress.model.Post; import com.sudhirkhanger.andpress.model.PostColumns; import com.sudhirkhanger.andpress.model.PostProvider; import com.sudhirkhanger.andpress.rest.WordPressAsyncTask; import com.sudhirkhanger.andpress.rest.WordPressResponse; import com.sudhirkhanger.andpress.widget.AndPressWidgetProvider; import java.util.ArrayList; public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> { public static final String ACTION_DATA_UPDATED = "com.sudhirkhanger.andpress.ACTION_DATA_UPDATED"; public static final String LOG_TAG = MainActivity.class.getSimpleName(); public static final String WP_SITE_URL = "https://api.myjson.com/bins/gqho3"; private RecyclerView recyclerView; private WordPressPostAdapter wordPressPostAdapter; private static final int WORDPRESS_LOADER_ID = 0; public static final String[] POST_COLUMNS = { PostColumns._ID, PostColumns.POST_ID, PostColumns.TITLE, PostColumns.IMAGE_URL, PostColumns.CONTENT }; private static boolean itemsAvailable = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); AdView mAdView = (AdView) findViewById(R.id.adView); AdRequest adRequest = new AdRequest.Builder().addTestDevice(AdRequest.DEVICE_ID_EMULATOR) .addTestDevice("5958710972D2BCB58D67C91E95E24602").build(); mAdView.loadAd(adRequest); recyclerView = (RecyclerView) findViewById(R.id.recyclerview); recyclerView.setLayoutManager(new LinearLayoutManager(this)); wordPressPostAdapter = new WordPressPostAdapter(this, null); recyclerView.setAdapter(new WordPressPostAdapter(this, null)); if (!itemsAvailable) { update(); } getSupportLoaderManager().initLoader(WORDPRESS_LOADER_ID, null, this); } @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; } private void update() { new WordPressAsyncTask(new WordPressResponse() { @Override public void processFinish(ArrayList<Post> postArrayList) { insertData(postArrayList); } }).execute(WP_SITE_URL); itemsAvailable = true; Toast.makeText(this, "Refreshing", Toast.LENGTH_SHORT).show(); Log.e(LOG_TAG, "update()"); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { update(); return true; } return super.onOptionsItemSelected(item); } public void insertData(ArrayList<Post> postArrayList) { Log.d(LOG_TAG, "insert"); ArrayList<ContentProviderOperation> batchOperations = new ArrayList<>(10); for (Post post : postArrayList) { ContentProviderOperation.Builder builder = ContentProviderOperation .newInsert(PostProvider.Posts.CONTENT_URI); builder.withValue(PostColumns.POST_ID, post.getId()); builder.withValue(PostColumns.TITLE, post.getTitle()); builder.withValue(PostColumns.IMAGE_URL, post.getImage_url()); builder.withValue(PostColumns.CONTENT, post.getContent()); batchOperations.add(builder.build()); } try { getContentResolver().applyBatch(PostProvider.AUTHORITY, batchOperations); } catch (RemoteException | OperationApplicationException e) { Log.e(LOG_TAG, "Error applying batch insert", e); } } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { return new CursorLoader(this, PostProvider.Posts.CONTENT_URI, POST_COLUMNS, null, null, null); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { recyclerView.setAdapter(new WordPressPostAdapter(this, cursor)); updateWidgets(); } @Override public void onLoaderReset(Loader<Cursor> loader) { wordPressPostAdapter.swapCursor(null); } private void updateWidgets() { ComponentName name = new ComponentName(this, AndPressWidgetProvider.class); int[] ids = AppWidgetManager.getInstance(this).getAppWidgetIds(name); Intent intent = new Intent(this, AndPressWidgetProvider.class); intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE); intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids); sendBroadcast(intent); } }