1*90c8c64dSAndroid Build Coastguard Worker /* 2*90c8c64dSAndroid Build Coastguard Worker * Copyright (C) 2014 The Android Open Source Project 3*90c8c64dSAndroid Build Coastguard Worker * 4*90c8c64dSAndroid Build Coastguard Worker * Licensed under the Apache License, Version 2.0 (the "License"); 5*90c8c64dSAndroid Build Coastguard Worker * you may not use this file except in compliance with the License. 6*90c8c64dSAndroid Build Coastguard Worker * You may obtain a copy of the License at 7*90c8c64dSAndroid Build Coastguard Worker * 8*90c8c64dSAndroid Build Coastguard Worker * http://www.apache.org/licenses/LICENSE-2.0 9*90c8c64dSAndroid Build Coastguard Worker * 10*90c8c64dSAndroid Build Coastguard Worker * Unless required by applicable law or agreed to in writing, software 11*90c8c64dSAndroid Build Coastguard Worker * distributed under the License is distributed on an "AS IS" BASIS, 12*90c8c64dSAndroid Build Coastguard Worker * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13*90c8c64dSAndroid Build Coastguard Worker * See the License for the specific language governing permissions and 14*90c8c64dSAndroid Build Coastguard Worker * limitations under the License. 15*90c8c64dSAndroid Build Coastguard Worker */ 16*90c8c64dSAndroid Build Coastguard Worker 17*90c8c64dSAndroid Build Coastguard Worker package com.example.android.recyclerview; 18*90c8c64dSAndroid Build Coastguard Worker 19*90c8c64dSAndroid Build Coastguard Worker import android.os.Bundle; 20*90c8c64dSAndroid Build Coastguard Worker import android.support.v4.app.Fragment; 21*90c8c64dSAndroid Build Coastguard Worker import android.support.v7.widget.GridLayoutManager; 22*90c8c64dSAndroid Build Coastguard Worker import android.support.v7.widget.LinearLayoutManager; 23*90c8c64dSAndroid Build Coastguard Worker import android.support.v7.widget.RecyclerView; 24*90c8c64dSAndroid Build Coastguard Worker import android.view.LayoutInflater; 25*90c8c64dSAndroid Build Coastguard Worker import android.view.View; 26*90c8c64dSAndroid Build Coastguard Worker import android.view.ViewGroup; 27*90c8c64dSAndroid Build Coastguard Worker import android.widget.RadioButton; 28*90c8c64dSAndroid Build Coastguard Worker 29*90c8c64dSAndroid Build Coastguard Worker /** 30*90c8c64dSAndroid Build Coastguard Worker * Demonstrates the use of {@link RecyclerView} with a {@link LinearLayoutManager} and a 31*90c8c64dSAndroid Build Coastguard Worker * {@link GridLayoutManager}. 32*90c8c64dSAndroid Build Coastguard Worker */ 33*90c8c64dSAndroid Build Coastguard Worker public class RecyclerViewFragment extends Fragment { 34*90c8c64dSAndroid Build Coastguard Worker 35*90c8c64dSAndroid Build Coastguard Worker private static final String TAG = "RecyclerViewFragment"; 36*90c8c64dSAndroid Build Coastguard Worker private static final String KEY_LAYOUT_MANAGER = "layoutManager"; 37*90c8c64dSAndroid Build Coastguard Worker private static final int SPAN_COUNT = 2; 38*90c8c64dSAndroid Build Coastguard Worker private static final int DATASET_COUNT = 60; 39*90c8c64dSAndroid Build Coastguard Worker 40*90c8c64dSAndroid Build Coastguard Worker private enum LayoutManagerType { 41*90c8c64dSAndroid Build Coastguard Worker GRID_LAYOUT_MANAGER, 42*90c8c64dSAndroid Build Coastguard Worker LINEAR_LAYOUT_MANAGER 43*90c8c64dSAndroid Build Coastguard Worker } 44*90c8c64dSAndroid Build Coastguard Worker 45*90c8c64dSAndroid Build Coastguard Worker protected LayoutManagerType mCurrentLayoutManagerType; 46*90c8c64dSAndroid Build Coastguard Worker 47*90c8c64dSAndroid Build Coastguard Worker protected RadioButton mLinearLayoutRadioButton; 48*90c8c64dSAndroid Build Coastguard Worker protected RadioButton mGridLayoutRadioButton; 49*90c8c64dSAndroid Build Coastguard Worker 50*90c8c64dSAndroid Build Coastguard Worker protected RecyclerView mRecyclerView; 51*90c8c64dSAndroid Build Coastguard Worker protected CustomAdapter mAdapter; 52*90c8c64dSAndroid Build Coastguard Worker protected RecyclerView.LayoutManager mLayoutManager; 53*90c8c64dSAndroid Build Coastguard Worker protected String[] mDataset; 54*90c8c64dSAndroid Build Coastguard Worker 55*90c8c64dSAndroid Build Coastguard Worker @Override onCreate(Bundle savedInstanceState)56*90c8c64dSAndroid Build Coastguard Worker public void onCreate(Bundle savedInstanceState) { 57*90c8c64dSAndroid Build Coastguard Worker super.onCreate(savedInstanceState); 58*90c8c64dSAndroid Build Coastguard Worker 59*90c8c64dSAndroid Build Coastguard Worker // Initialize dataset, this data would usually come from a local content provider or 60*90c8c64dSAndroid Build Coastguard Worker // remote server. 61*90c8c64dSAndroid Build Coastguard Worker initDataset(); 62*90c8c64dSAndroid Build Coastguard Worker } 63*90c8c64dSAndroid Build Coastguard Worker 64*90c8c64dSAndroid Build Coastguard Worker @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)65*90c8c64dSAndroid Build Coastguard Worker public View onCreateView(LayoutInflater inflater, ViewGroup container, 66*90c8c64dSAndroid Build Coastguard Worker Bundle savedInstanceState) { 67*90c8c64dSAndroid Build Coastguard Worker View rootView = inflater.inflate(R.layout.recycler_view_frag, container, false); 68*90c8c64dSAndroid Build Coastguard Worker rootView.setTag(TAG); 69*90c8c64dSAndroid Build Coastguard Worker 70*90c8c64dSAndroid Build Coastguard Worker // BEGIN_INCLUDE(initializeRecyclerView) 71*90c8c64dSAndroid Build Coastguard Worker mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView); 72*90c8c64dSAndroid Build Coastguard Worker 73*90c8c64dSAndroid Build Coastguard Worker // LinearLayoutManager is used here, this will layout the elements in a similar fashion 74*90c8c64dSAndroid Build Coastguard Worker // to the way ListView would layout elements. The RecyclerView.LayoutManager defines how 75*90c8c64dSAndroid Build Coastguard Worker // elements are laid out. 76*90c8c64dSAndroid Build Coastguard Worker mLayoutManager = new LinearLayoutManager(getActivity()); 77*90c8c64dSAndroid Build Coastguard Worker 78*90c8c64dSAndroid Build Coastguard Worker mCurrentLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT_MANAGER; 79*90c8c64dSAndroid Build Coastguard Worker 80*90c8c64dSAndroid Build Coastguard Worker if (savedInstanceState != null) { 81*90c8c64dSAndroid Build Coastguard Worker // Restore saved layout manager type. 82*90c8c64dSAndroid Build Coastguard Worker mCurrentLayoutManagerType = (LayoutManagerType) savedInstanceState 83*90c8c64dSAndroid Build Coastguard Worker .getSerializable(KEY_LAYOUT_MANAGER); 84*90c8c64dSAndroid Build Coastguard Worker } 85*90c8c64dSAndroid Build Coastguard Worker setRecyclerViewLayoutManager(mCurrentLayoutManagerType); 86*90c8c64dSAndroid Build Coastguard Worker 87*90c8c64dSAndroid Build Coastguard Worker mAdapter = new CustomAdapter(mDataset); 88*90c8c64dSAndroid Build Coastguard Worker // Set CustomAdapter as the adapter for RecyclerView. 89*90c8c64dSAndroid Build Coastguard Worker mRecyclerView.setAdapter(mAdapter); 90*90c8c64dSAndroid Build Coastguard Worker // END_INCLUDE(initializeRecyclerView) 91*90c8c64dSAndroid Build Coastguard Worker 92*90c8c64dSAndroid Build Coastguard Worker mLinearLayoutRadioButton = (RadioButton) rootView.findViewById(R.id.linear_layout_rb); 93*90c8c64dSAndroid Build Coastguard Worker mLinearLayoutRadioButton.setOnClickListener(new View.OnClickListener() { 94*90c8c64dSAndroid Build Coastguard Worker @Override 95*90c8c64dSAndroid Build Coastguard Worker public void onClick(View v) { 96*90c8c64dSAndroid Build Coastguard Worker setRecyclerViewLayoutManager(LayoutManagerType.LINEAR_LAYOUT_MANAGER); 97*90c8c64dSAndroid Build Coastguard Worker } 98*90c8c64dSAndroid Build Coastguard Worker }); 99*90c8c64dSAndroid Build Coastguard Worker 100*90c8c64dSAndroid Build Coastguard Worker mGridLayoutRadioButton = (RadioButton) rootView.findViewById(R.id.grid_layout_rb); 101*90c8c64dSAndroid Build Coastguard Worker mGridLayoutRadioButton.setOnClickListener(new View.OnClickListener() { 102*90c8c64dSAndroid Build Coastguard Worker @Override 103*90c8c64dSAndroid Build Coastguard Worker public void onClick(View v) { 104*90c8c64dSAndroid Build Coastguard Worker setRecyclerViewLayoutManager(LayoutManagerType.GRID_LAYOUT_MANAGER); 105*90c8c64dSAndroid Build Coastguard Worker } 106*90c8c64dSAndroid Build Coastguard Worker }); 107*90c8c64dSAndroid Build Coastguard Worker 108*90c8c64dSAndroid Build Coastguard Worker return rootView; 109*90c8c64dSAndroid Build Coastguard Worker } 110*90c8c64dSAndroid Build Coastguard Worker 111*90c8c64dSAndroid Build Coastguard Worker /** 112*90c8c64dSAndroid Build Coastguard Worker * Set RecyclerView's LayoutManager to the one given. 113*90c8c64dSAndroid Build Coastguard Worker * 114*90c8c64dSAndroid Build Coastguard Worker * @param layoutManagerType Type of layout manager to switch to. 115*90c8c64dSAndroid Build Coastguard Worker */ setRecyclerViewLayoutManager(LayoutManagerType layoutManagerType)116*90c8c64dSAndroid Build Coastguard Worker public void setRecyclerViewLayoutManager(LayoutManagerType layoutManagerType) { 117*90c8c64dSAndroid Build Coastguard Worker int scrollPosition = 0; 118*90c8c64dSAndroid Build Coastguard Worker 119*90c8c64dSAndroid Build Coastguard Worker // If a layout manager has already been set, get current scroll position. 120*90c8c64dSAndroid Build Coastguard Worker if (mRecyclerView.getLayoutManager() != null) { 121*90c8c64dSAndroid Build Coastguard Worker scrollPosition = ((LinearLayoutManager) mRecyclerView.getLayoutManager()) 122*90c8c64dSAndroid Build Coastguard Worker .findFirstCompletelyVisibleItemPosition(); 123*90c8c64dSAndroid Build Coastguard Worker } 124*90c8c64dSAndroid Build Coastguard Worker 125*90c8c64dSAndroid Build Coastguard Worker switch (layoutManagerType) { 126*90c8c64dSAndroid Build Coastguard Worker case GRID_LAYOUT_MANAGER: 127*90c8c64dSAndroid Build Coastguard Worker mLayoutManager = new GridLayoutManager(getActivity(), SPAN_COUNT); 128*90c8c64dSAndroid Build Coastguard Worker mCurrentLayoutManagerType = LayoutManagerType.GRID_LAYOUT_MANAGER; 129*90c8c64dSAndroid Build Coastguard Worker break; 130*90c8c64dSAndroid Build Coastguard Worker case LINEAR_LAYOUT_MANAGER: 131*90c8c64dSAndroid Build Coastguard Worker mLayoutManager = new LinearLayoutManager(getActivity()); 132*90c8c64dSAndroid Build Coastguard Worker mCurrentLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT_MANAGER; 133*90c8c64dSAndroid Build Coastguard Worker break; 134*90c8c64dSAndroid Build Coastguard Worker default: 135*90c8c64dSAndroid Build Coastguard Worker mLayoutManager = new LinearLayoutManager(getActivity()); 136*90c8c64dSAndroid Build Coastguard Worker mCurrentLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT_MANAGER; 137*90c8c64dSAndroid Build Coastguard Worker } 138*90c8c64dSAndroid Build Coastguard Worker 139*90c8c64dSAndroid Build Coastguard Worker mRecyclerView.setLayoutManager(mLayoutManager); 140*90c8c64dSAndroid Build Coastguard Worker mRecyclerView.scrollToPosition(scrollPosition); 141*90c8c64dSAndroid Build Coastguard Worker } 142*90c8c64dSAndroid Build Coastguard Worker 143*90c8c64dSAndroid Build Coastguard Worker @Override onSaveInstanceState(Bundle savedInstanceState)144*90c8c64dSAndroid Build Coastguard Worker public void onSaveInstanceState(Bundle savedInstanceState) { 145*90c8c64dSAndroid Build Coastguard Worker // Save currently selected layout manager. 146*90c8c64dSAndroid Build Coastguard Worker savedInstanceState.putSerializable(KEY_LAYOUT_MANAGER, mCurrentLayoutManagerType); 147*90c8c64dSAndroid Build Coastguard Worker super.onSaveInstanceState(savedInstanceState); 148*90c8c64dSAndroid Build Coastguard Worker } 149*90c8c64dSAndroid Build Coastguard Worker 150*90c8c64dSAndroid Build Coastguard Worker /** 151*90c8c64dSAndroid Build Coastguard Worker * Generates Strings for RecyclerView's adapter. This data would usually come 152*90c8c64dSAndroid Build Coastguard Worker * from a local content provider or remote server. 153*90c8c64dSAndroid Build Coastguard Worker */ initDataset()154*90c8c64dSAndroid Build Coastguard Worker private void initDataset() { 155*90c8c64dSAndroid Build Coastguard Worker mDataset = new String[DATASET_COUNT]; 156*90c8c64dSAndroid Build Coastguard Worker for (int i = 0; i < DATASET_COUNT; i++) { 157*90c8c64dSAndroid Build Coastguard Worker mDataset[i] = "This is element #" + i; 158*90c8c64dSAndroid Build Coastguard Worker } 159*90c8c64dSAndroid Build Coastguard Worker } 160*90c8c64dSAndroid Build Coastguard Worker } 161