android.support.test.testapp.RecyclerViewActivity.java Source code

Introduction

Here is the source code for android.support.test.testapp.RecyclerViewActivity.java

Source

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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 android.support.test.testapp;

import android.support.test.testapp.RecyclerViewFragment.LayoutManagerType;
import com.google.common.annotations.VisibleForTesting;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.util.Log;
import android.util.SparseArray;
import android.view.ViewGroup;

/**
 * Simple RecylcerViewActivity which hosts a {@link android.support.v4.view.ViewPager} that contains
 * three {@link android.support.v4.app.Fragment}s. Each Fragment contains a
 * {@link android.support.v7.widget.RecyclerView} with a different layout manager,
 * {@link android.support.v7.widget.LinearLayoutManager},
 * {@link android.support.v7.widget.GridLayoutManager} and {@link StaggeredGridLayoutManager}
 */
public class RecyclerViewActivity extends FragmentActivity {

    private static final String TAG = "RecyclerViewActivity";

    private ViewPager viewPager;
    private RecyclerViewPagerAdapter recylcerViewPagerAdapter;
    private SlidingTabLayout slidingTabLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recyclerview_activity);
        initViewPager();
        initSlidingTabLayout();
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        if (null != viewPager) {
            viewPager.setCurrentItem(0);
        }
    }

    @VisibleForTesting
    public void addItems(String newItem) {
        recylcerViewPagerAdapter.addItems(newItem);
    }

    /**
     * The {@link android.support.v4.app.FragmentPagerAdapter} to display the different
     * {@link android.support.test.testapp.RecyclerViewFragment}s
     */
    private static class RecyclerViewPagerAdapter extends FragmentPagerAdapter {

        private SparseArray<RecyclerViewFragment> fragmentTracker = new SparseArray<RecyclerViewFragment>(3);

        public RecyclerViewPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            RecyclerViewFragment fragment = RecyclerViewFragment
                    .newInstance(LayoutManagerType.LINEAR.values()[position]);
            fragmentTracker.put(position, fragment);
            return fragment;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            fragmentTracker.remove(position);
            super.destroyItem(container, position, object);
        }

        @Override
        public int getCount() {
            return LayoutManagerType.values().length;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return LayoutManagerType.values()[position].toString();
        }

        public void addItems(String newItem) {
            for (int position = 0; position < getCount(); position++) {
                RecyclerViewFragment fragmentAtPos = fragmentTracker.get(position);
                if (fragmentAtPos != null) {
                    fragmentAtPos.addItem(newItem);
                } else {
                    Log.w(TAG, "fragmentAtPos " + position + "is null!");
                }
            }
        }

    }

    private void initSlidingTabLayout() {
        slidingTabLayout = (SlidingTabLayout) findViewById(R.id.sliding_tabs);
        slidingTabLayout.setCustomTabView(R.layout.tab_indicator, android.R.id.text1);
        slidingTabLayout.setSelectedIndicatorColors(getResources().getColor(R.color.tab_selected_strip));
        slidingTabLayout.setDistributeEvenly(true);
        slidingTabLayout.setViewPager(viewPager);
    }

    private void initViewPager() {
        viewPager = (ViewPager) findViewById(R.id.rv_view_pager);
        recylcerViewPagerAdapter = new RecyclerViewPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(recylcerViewPagerAdapter);
    }

}