com.github.googlecodelabs.icon_shop.CartActivity.java Source code

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Here is the source code for com.github.googlecodelabs.icon_shop.CartActivity.java

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// Copyright 2016 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.github.googlecodelabs.icon_shop;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.NavUtils;
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.view.MenuItem;
import android.view.View;
import android.widget.TextView;

import java.util.List;
import java.util.concurrent.TimeUnit;

public class CartActivity extends AppCompatActivity {
    private List<App.ItemData> mCardContent;

    private RecyclerView.LayoutManager mItemListLayoutManager;
    private ItemsListAdapter mAdapter;
    private FloatingActionButton mFloatingActionButton;

    private RecyclerView getItemsRecycleView() {
        return (RecyclerView) findViewById(R.id.items_list);
    }

    private TextView getCardMessage() {
        return (TextView) findViewById(R.id.card_message);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cart);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mFloatingActionButton = (FloatingActionButton) findViewById(R.id.fab);
        mFloatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(final View view) {
                Snackbar.make(view, "Checking out...", Snackbar.LENGTH_LONG).setAction("Action", null).show();
                final Handler handler = new Handler();
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        AsyncTask<Void, Void, Void> _ = new AsyncTask<Void, Void, Void>() {
                            @Override
                            protected Void doInBackground(Void... voids) {
                                App.clearCart();
                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        mFloatingActionButton.setVisibility(View.GONE);
                                        Snackbar.make(view, "Checking completed!", Snackbar.LENGTH_LONG)
                                                .setAction("Action", null).show();
                                        handler.postDelayed(new Runnable() {
                                            @Override
                                            public void run() {
                                                NavUtils.navigateUpFromSameTask(CartActivity.this);
                                            }
                                        }, TimeUnit.SECONDS.toMillis(1));
                                    }
                                });
                                return null;
                            }
                        }.execute();
                    }
                }, TimeUnit.SECONDS.toMillis(2)); // Delay for 2 seconds
            }
        });

        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        mCardContent = App.getCardContent();

        RecyclerView recyclerView = getItemsRecycleView();
        recyclerView.setHasFixedSize(true);
        mItemListLayoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(mItemListLayoutManager);
        mAdapter = new ItemsListAdapter(mCardContent, true);
        recyclerView.setAdapter(mAdapter);
        mAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
            @Override
            public void onItemRangeRemoved(int positionStart, int itemCount) {
                super.onItemRangeRemoved(positionStart, itemCount);
                updateCardInfo();
            }

            @Override
            public void onItemRangeInserted(int positionStart, int itemCount) {
                super.onItemRangeInserted(positionStart, itemCount);
                updateCardInfo();
            }
        });
        updateCardInfo();
    }

    private long getCartBalance() {
        long credits = 0;
        for (App.ItemData item : mAdapter.mDataSet)
            credits += item.mPrice;
        return credits;
    }

    private void updateCardInfo() {
        if (mAdapter.getItemCount() == 0) {
            getCardMessage().setText("Cart is empty");
            mFloatingActionButton.setVisibility(View.GONE);
        } else {
            getCardMessage().setText("Cart total " + getCartBalance() + " credits");
            mFloatingActionButton.setVisibility(View.VISIBLE);
        }
    }

    public static void startActivity(Context context) {
        Intent intent = new Intent(context, CartActivity.class);
        context.startActivity(intent);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home: {
            NavUtils.navigateUpFromSameTask(this);
            break;
        }
        }
        return super.onOptionsItemSelected(item);
    }
}