1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.example.android.supportv7.util; 17 18 import com.example.android.supportv7.R; 19 import android.os.Bundle; 20 import android.support.v7.app.ActionBarActivity; 21 import android.support.v7.util.SortedList; 22 import android.support.v7.widget.LinearLayoutManager; 23 import android.support.v7.widget.RecyclerView; 24 import android.support.v7.widget.util.SortedListAdapterCallback; 25 import android.view.KeyEvent; 26 import android.view.LayoutInflater; 27 import android.view.View; 28 import android.view.ViewGroup; 29 import android.view.inputmethod.EditorInfo; 30 import android.widget.CheckBox; 31 import android.widget.CompoundButton; 32 import android.widget.EditText; 33 import android.widget.TextView; 34 35 /** 36 * A sample activity that uses {@link SortedList} in combination with RecyclerView. 37 */ 38 public class SortedListActivity extends ActionBarActivity { 39 private RecyclerView mRecyclerView; 40 private LinearLayoutManager mLinearLayoutManager; 41 private SortedListAdapter mAdapter; 42 @Override 43 protected void onCreate(Bundle savedInstanceState) { 44 super.onCreate(savedInstanceState); 45 setContentView(R.layout.sorted_list_activity); 46 mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view); 47 mRecyclerView.setHasFixedSize(true); 48 mLinearLayoutManager = new LinearLayoutManager(this); 49 mRecyclerView.setLayoutManager(mLinearLayoutManager); 50 mAdapter = new SortedListAdapter(getLayoutInflater(), 51 new Item("buy milk"), new Item("wash the car"), 52 new Item("wash the dishes")); 53 mRecyclerView.setAdapter(mAdapter); 54 mRecyclerView.setHasFixedSize(true); 55 final EditText newItemTextView = (EditText) findViewById(R.id.new_item_text_view); 56 newItemTextView.setOnEditorActionListener(new TextView.OnEditorActionListener() { 57 @Override 58 public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) { 59 if (id == EditorInfo.IME_ACTION_DONE && 60 (keyEvent == null || keyEvent.getAction() == KeyEvent.ACTION_DOWN)) { 61 final String text = textView.getText().toString().trim(); 62 if (text.length() > 0) { 63 mAdapter.addItem(new Item(text)); 64 } 65 textView.setText(""); 66 return true; 67 } 68 return false; 69 } 70 }); 71 } 72 73 private static class SortedListAdapter extends RecyclerView.Adapter<TodoViewHolder> { 74 SortedList<Item> mData; 75 final LayoutInflater mLayoutInflater; 76 public SortedListAdapter(LayoutInflater layoutInflater, Item... items) { 77 mLayoutInflater = layoutInflater; 78 mData = new SortedList<Item>(Item.class, new SortedListAdapterCallback<Item>(this) { 79 @Override 80 public int compare(Item t0, Item t1) { 81 if (t0.mIsDone != t1.mIsDone) { 82 return t0.mIsDone ? 1 : -1; 83 } 84 int txtComp = t0.mText.compareTo(t1.mText); 85 if (txtComp != 0) { 86 return txtComp; 87 } 88 if (t0.id < t1.id) { 89 return -1; 90 } else if (t0.id > t1.id) { 91 return 1; 92 } 93 return 0; 94 } 95 96 @Override 97 public boolean areContentsTheSame(Item oldItem, 98 Item newItem) { 99 return oldItem.mText.equals(newItem.mText); 100 } 101 102 @Override 103 public boolean areItemsTheSame(Item item1, Item item2) { 104 return item1.id == item2.id; 105 } 106 }); 107 for (Item item : items) { 108 mData.add(item); 109 } 110 } 111 112 public void addItem(Item item) { 113 mData.add(item); 114 } 115 116 @Override 117 public TodoViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) { 118 return new TodoViewHolder ( 119 mLayoutInflater.inflate(R.layout.sorted_list_item_view, parent, false)) { 120 @Override 121 void onDoneChanged(boolean isDone) { 122 int adapterPosition = getAdapterPosition(); 123 if (adapterPosition == RecyclerView.NO_POSITION) { 124 return; 125 } 126 mBoundItem.mIsDone = isDone; 127 mData.recalculatePositionOfItemAt(adapterPosition); 128 } 129 }; 130 } 131 132 @Override 133 public void onBindViewHolder(TodoViewHolder holder, int position) { 134 holder.bindTo(mData.get(position)); 135 } 136 137 @Override 138 public int getItemCount() { 139 return mData.size(); 140 } 141 } 142 143 abstract private static class TodoViewHolder extends RecyclerView.ViewHolder { 144 final CheckBox mCheckBox; 145 Item mBoundItem; 146 public TodoViewHolder(View itemView) { 147 super(itemView); 148 mCheckBox = (CheckBox) itemView; 149 mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 150 @Override 151 public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 152 if (mBoundItem != null && isChecked != mBoundItem.mIsDone) { 153 onDoneChanged(isChecked); 154 } 155 } 156 }); 157 } 158 159 public void bindTo(Item item) { 160 mBoundItem = item; 161 mCheckBox.setText(item.mText); 162 mCheckBox.setChecked(item.mIsDone); 163 } 164 165 abstract void onDoneChanged(boolean isChecked); 166 } 167 168 private static class Item { 169 String mText; 170 boolean mIsDone = false; 171 final public int id; 172 private static int idCounter = 0; 173 174 public Item(String text) { 175 id = idCounter ++; 176 this.mText = text; 177 } 178 } 179 } 180
