| /* |
| * Copyright (C) 2017 Google Inc. All Rights Reserved. |
| * |
| * 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.example.android.wearable.wear.wearaccessibilityapp; |
| |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.support.v4.app.FragmentActivity; |
| import android.support.v7.widget.LinearLayoutManager; |
| import android.support.v7.widget.RecyclerView; |
| import android.support.wear.ambient.AmbientModeSupport; |
| import android.support.wear.widget.WearableRecyclerView; |
| import android.support.wear.widget.drawer.WearableActionDrawerView; |
| import android.view.View; |
| |
| import com.example.android.wearable.wear.wearaccessibilityapp.LongListRecyclerViewAdapter.SwitchChangeListener; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class LongListActivity extends FragmentActivity implements |
| AmbientModeSupport.AmbientCallbackProvider { |
| |
| private List<AppItem> mItems; |
| private LongListRecyclerViewAdapter mAdapter; |
| private Handler mHandler; |
| private int mPreviousLastVisibleItem; |
| private int mLastVisibleItem; |
| private boolean mFinishLoad; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.activity_long_list); |
| |
| AmbientModeSupport.attach(this); |
| |
| mHandler = new Handler(); |
| |
| // List of items to display within recyclerView (used by adapter). |
| mItems = new ArrayList<AppItem>(); |
| mItems.add(new AppItem(null, 0, SampleAppConstants.TITLE, null)); // for title |
| mItems.add(new AppItem(null, 0, SampleAppConstants.SWITCH, null)); // for switch widget |
| for (int i = 1; i <= 10; i++) { |
| mItems.add( |
| new AppItem( |
| getResources().getString(R.string.item_text, i), |
| R.drawable.heart_circle, |
| SampleAppConstants.NORMAL, |
| null)); |
| } |
| |
| // Custom adapter used so we can use custom layout for the rows within the list. |
| mAdapter = |
| new LongListRecyclerViewAdapter( |
| this, |
| mItems, |
| new SwitchChangeListener() { |
| @Override |
| public void onChange(boolean switchOn) { |
| WearableActionDrawerView wearableActionDrawer = |
| findViewById(R.id.action_drawer_long_list); |
| |
| if (switchOn) { |
| wearableActionDrawer.setVisibility( |
| View.VISIBLE); // Hide drawer. |
| } else { |
| wearableActionDrawer.setVisibility( |
| View.INVISIBLE); // Hide drawer. |
| } |
| } |
| }); |
| WearableRecyclerView recyclerView = findViewById(R.id.recycler_view_long_list); |
| |
| recyclerView.setLayoutManager(new LinearLayoutManager(this)); |
| recyclerView.setHasFixedSize(false); |
| |
| recyclerView.setAdapter(mAdapter); // Set adapter to the recyclerView. |
| |
| // Uncomment if you want the action drawer to show while scrolling down. |
| // WearableActionDrawer mWearableActionDrawer= |
| // (WearableActionDrawer) findViewById(R.id.action_drawer_long_list); |
| // mWearableActionDrawer.setShouldPeekOnScrollDown(true); |
| |
| mPreviousLastVisibleItem = 0; // default |
| mLastVisibleItem = 0; |
| mFinishLoad = false; |
| |
| if (!(recyclerView.getLayoutManager() instanceof LinearLayoutManager)) { |
| return; // invalid layout manager |
| } |
| |
| final LinearLayoutManager layoutManager = |
| (LinearLayoutManager) recyclerView.getLayoutManager(); |
| |
| recyclerView.addOnScrollListener( |
| new WearableRecyclerView.OnScrollListener() { |
| @Override |
| public void onScrolled(RecyclerView recyclerView, int dx, int dy) { |
| super.onScrolled(recyclerView, dx, dy); |
| mLastVisibleItem = layoutManager.findLastVisibleItemPosition(); |
| if (!mFinishLoad) { |
| int count = |
| layoutManager |
| .getItemCount(); // total items in the recycler view |
| |
| // Do not notify LongListActivity if no NEW items have been displayed. |
| if (mLastVisibleItem <= mPreviousLastVisibleItem) { |
| return; |
| } |
| |
| // Do not notify LongListActivity if not yet scrolled to threshold. |
| if (mLastVisibleItem < count - 1) { |
| return; |
| } |
| |
| if (mLastVisibleItem % 10 == 2 && mLastVisibleItem != 2) { |
| return; |
| } |
| |
| // End of list, no more loading. |
| if (mLastVisibleItem >= SampleAppConstants.END_OF_LONG_LIST) { |
| mFinishLoad = true; // we are done loading more items. |
| addFooter(); |
| return; |
| } |
| |
| // Load more items |
| addData(); |
| |
| // To check if new items should be displayed or not. |
| mPreviousLastVisibleItem = mLastVisibleItem; |
| } |
| } |
| }); |
| } |
| |
| /** |
| * Add items to List<AppItem> items. More items requested by adapter (used to load list in |
| * batches of 10). |
| */ |
| public void addData() { |
| // Add progress bar to list. |
| mItems.add(new AppItem(null, 0, SampleAppConstants.PROGRESS_BAR, null)); |
| mAdapter.notifyItemInserted(mItems.size() - 1); |
| |
| // Delay for 1000 milliseconds and then execute below code. |
| mHandler.postDelayed( |
| new Runnable() { |
| @Override |
| public void run() { |
| // Remove progress after the delay. |
| mItems.remove(mItems.size() - 1); |
| |
| // Add ten items to List<AppItem> items. |
| int listSize = mItems.size(); |
| for (int i = listSize - 1; i <= listSize + 8; i++) { |
| mItems.add( |
| new AppItem( |
| getResources().getString(R.string.item_text, i), |
| R.drawable.heart_circle, |
| SampleAppConstants.NORMAL, |
| null)); |
| } |
| mAdapter.notifyDataSetChanged(); |
| } |
| }, |
| 1000); |
| } |
| |
| /** Add footer to List<AppItem> items. Requested by adapter (called at the end of the list). */ |
| public void addFooter() { |
| mItems.add(new AppItem(null, 0, SampleAppConstants.HEADER_FOOTER, null)); // add footer |
| mAdapter.notifyItemInserted(mItems.size() - 1); |
| } |
| |
| @Override |
| public AmbientModeSupport.AmbientCallback getAmbientCallback() { |
| return new MyAmbientCallback(); |
| } |
| |
| private class MyAmbientCallback extends AmbientModeSupport.AmbientCallback {} |
| } |