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 android.os.Bundle; 19 import android.support.v7.app.AppCompatActivity; 20 import android.support.v7.util.SortedList; 21 import android.support.v7.widget.LinearLayoutManager; 22 import android.support.v7.widget.RecyclerView; 23 import android.support.v7.widget.util.SortedListAdapterCallback; 24 import android.view.KeyEvent; 25 import android.view.LayoutInflater; 26 import android.view.View; 27 import android.view.ViewGroup; 28 import android.view.inputmethod.EditorInfo; 29 import android.widget.CheckBox; 30 import android.widget.CompoundButton; 31 import android.widget.EditText; 32 import android.widget.TextView; 33 34 import com.example.android.supportv7.R; 35 36 /** 37 * A sample activity that uses {@link SortedList} in combination with RecyclerView. 38 */ 39 public class SortedListActivity extends AppCompatActivity { 40 private RecyclerView mRecyclerView; 41 private LinearLayoutManager mLinearLayoutManager; 42 private SortedListAdapter mAdapter; 43 @Override 44 protected void onCreate(Bundle savedInstanceState) { 45 super.onCreate(savedInstanceState); 46 setContentView(R.layout.sorted_list_activity); 47 mRecyclerView = findViewById(R.id.recycler_view); 48 mRecyclerView.setHasFixedSize(true); 49 mLinearLayoutManager = new LinearLayoutManager(this); 50 mRecyclerView.setLayoutManager(mLinearLayoutManager); 51 mAdapter = new SortedListAdapter(getLayoutInflater(), 52 new Item("buy milk"), new Item("wash the car"), 53 new Item("wash the dishes")); 54 mRecyclerView.setAdapter(mAdapter); 55 mRecyclerView.setHasFixedSize(true); 56 final EditText newItemTextView = findViewById(R.id.new_item_text_view); 57 newItemTextView.setOnEditorActionListener(new TextView.OnEditorActionListener() { 58 @Override 59 public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) { 60 if (id == EditorInfo.IME_ACTION_DONE && 61 (keyEvent == null || keyEvent.getAction() == KeyEvent.ACTION_DOWN)) { 62 final String text = textView.getText().toString().trim(); 63 if (text.length() > 0) { 64 mAdapter.addItem(new Item(text)); 65 } 66 textView.setText(""); 67 return true; 68 } 69 return false; 70 } 71 }); 72 } 73 74 private static class SortedListAdapter extends RecyclerView.Adapter<TodoViewHolder> { 75 SortedList<Item> mData; 76 final LayoutInflater mLayoutInflater; 77 public SortedListAdapter(LayoutInflater layoutInflater, Item... items) { 78 mLayoutInflater = layoutInflater; 79 mData = new SortedList<Item>(Item.class, new SortedListAdapterCallback<Item>(this) { 80 @Override 81 public int compare(Item t0, Item t1) { 82 if (t0.mIsDone != t1.mIsDone) { 83 return t0.mIsDone ? 1 : -1; 84 } 85 int txtComp = t0.mText.compareTo(t1.mText); 86 if (txtComp != 0) { 87 return txtComp; 88 } 89 if (t0.id < t1.id) { 90 return -1; 91 } else if (t0.id > t1.id) { 92 return 1; 93 } 94 return 0; 95 } 96 97 @Override 98 public boolean areContentsTheSame(Item oldItem, 99 Item newItem) { 100 return oldItem.mText.equals(newItem.mText); 101 } 102 103 @Override 104 public boolean areItemsTheSame(Item item1, Item item2) { 105 return item1.id == item2.id; 106 } 107 }); 108 for (Item item : items) { 109 mData.add(item); 110 } 111 } 112 113 public void addItem(Item item) { 114 mData.add(item); 115 } 116 117 @Override 118 public TodoViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) { 119 return new TodoViewHolder ( 120 mLayoutInflater.inflate(R.layout.sorted_list_item_view, parent, false)) { 121 @Override 122 void onDoneChanged(boolean isDone) { 123 int adapterPosition = getAdapterPosition(); 124 if (adapterPosition == RecyclerView.NO_POSITION) { 125 return; 126 } 127 mBoundItem.mIsDone = isDone; 128 mData.recalculatePositionOfItemAt(adapterPosition); 129 } 130 }; 131 } 132 133 @Override 134 public void onBindViewHolder(TodoViewHolder holder, int position) { 135 holder.bindTo(mData.get(position)); 136 } 137 138 @Override 139 public int getItemCount() { 140 return mData.size(); 141 } 142 } 143 144 abstract private static class TodoViewHolder extends RecyclerView.ViewHolder { 145 final CheckBox mCheckBox; 146 Item mBoundItem; 147 public TodoViewHolder(View itemView) { 148 super(itemView); 149 mCheckBox = (CheckBox) itemView; 150 mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 151 @Override 152 public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 153 if (mBoundItem != null && isChecked != mBoundItem.mIsDone) { 154 onDoneChanged(isChecked); 155 } 156 } 157 }); 158 } 159 160 public void bindTo(Item item) { 161 mBoundItem = item; 162 mCheckBox.setText(item.mText); 163 mCheckBox.setChecked(item.mIsDone); 164 } 165 166 abstract void onDoneChanged(boolean isChecked); 167 } 168 169 private static class Item { 170 String mText; 171 boolean mIsDone = false; 172 final public int id; 173 private static int idCounter = 0; 174 175 public Item(String text) { 176 id = idCounter ++; 177 this.mText = text; 178 } 179 } 180 } 181
