Java tutorial
/* * Copyright 2017 Hannes Dorfmann. * * 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.hannesdorfmann.mosby3.sample.mvi.view.shoppingcartoverview; import android.graphics.Canvas; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.content.ContextCompat; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.helper.ItemTouchHelper; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.Unbinder; import com.hannesdorfmann.mosby3.mvi.MviFragment; import com.hannesdorfmann.mosby3.sample.mvi.R; import com.hannesdorfmann.mosby3.sample.mvi.SampleApplication; import com.hannesdorfmann.mosby3.sample.mvi.businesslogic.model.Product; import io.reactivex.Observable; import io.reactivex.subjects.PublishSubject; import java.util.List; import java.util.concurrent.TimeUnit; import timber.log.Timber; /** * This class doesn't neccessarily has to be a fragment. It's just a fragment because I want to * demonstrate that mosby works with fragments in xml layouts too. * * @author Hannes Dorfmann */ public class ShoppingCartOverviewFragment extends MviFragment<ShoppingCartOverviewView, ShoppingCartOverviewPresenter> implements ShoppingCartOverviewView { private ShoppingCartOverviewAdapter adapter; private PublishSubject<Product> removeRelay = PublishSubject.create(); private Unbinder unbinder; @BindView(R.id.shoppingCartRecyclerView) RecyclerView recyclerView; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment_shopping_cart, container, false); unbinder = ButterKnife.bind(this, v); adapter = new ShoppingCartOverviewAdapter(getActivity()); recyclerView.setAdapter(adapter); recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); setUpItemTouchHelper(); return v; } @Override public void onDestroyView() { super.onDestroyView(); unbinder.unbind(); } @NonNull @Override public ShoppingCartOverviewPresenter createPresenter() { Timber.d("Create Presenter"); return SampleApplication.getDependencyInjection(getActivity()).getShoppingCartPresenter(); } @Override public Observable<Boolean> loadItemsIntent() { return Observable.just(true); } @Override public Observable<List<Product>> selectItemsIntent() { return adapter.selectedItemsObservable(); } private void setUpItemTouchHelper() { // // Borrowed from https://github.com/nemanja-kovacevic/recycler-view-swipe-to-delete/blob/master/app/src/main/java/net/nemanjakovacevic/recyclerviewswipetodelete/MainActivity.java // ItemTouchHelper.SimpleCallback simpleItemTouchCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) { // we want to cache these and not allocate anything repeatedly in the onChildDraw method Drawable background; Drawable xMark; int xMarkMargin; boolean initiated; private void init() { background = new ColorDrawable(ContextCompat.getColor(getActivity(), R.color.delete_background)); xMark = ContextCompat.getDrawable(getActivity(), R.drawable.ic_remove); xMarkMargin = (int) getActivity().getResources().getDimension(R.dimen.ic_clear_margin); initiated = true; } // not important, we don't want drag & drop @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { return false; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) { int swipedPosition = viewHolder.getAdapterPosition(); Product productAt = adapter.getProductAt(swipedPosition); removeRelay.onNext(productAt); } @Override public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) { View itemView = viewHolder.itemView; // not sure why, but this method get's called for viewholder that are already swiped away if (viewHolder.getAdapterPosition() == -1) { // not interested in those return; } if (!initiated) { init(); } // draw red background background.setBounds(itemView.getRight() + (int) dX, itemView.getTop(), itemView.getRight(), itemView.getBottom()); background.draw(c); // draw x mark int itemHeight = itemView.getBottom() - itemView.getTop(); int intrinsicWidth = xMark.getIntrinsicWidth(); int intrinsicHeight = xMark.getIntrinsicWidth(); int xMarkLeft = itemView.getRight() - xMarkMargin - intrinsicWidth; int xMarkRight = itemView.getRight() - xMarkMargin; int xMarkTop = itemView.getTop() + (itemHeight - intrinsicHeight) / 2; int xMarkBottom = xMarkTop + intrinsicHeight; xMark.setBounds(xMarkLeft, xMarkTop, xMarkRight, xMarkBottom); // xMark.draw(c); super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive); } }; ItemTouchHelper mItemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback); mItemTouchHelper.attachToRecyclerView(recyclerView); } @Override public Observable<Product> removeItemIntent() { // DELEAY it for 500 miliseconds so that the user sees the swipe to delete animation return removeRelay.delay(500, TimeUnit.MILLISECONDS); } @Override public void render(List<ShoppingCartOverviewItem> itemsInShoppingCart) { Timber.d("Render %s ", itemsInShoppingCart); adapter.setItems(itemsInShoppingCart); } }