SortedList demo activity

This CL adds a new activity which demostrates using a
SortedList with a RecyclerView.

Bug: 18753633
Change-Id: I02307df129d44ac8a110a8c7f467787870336cf1

samples/Support7Demos/AndroidManifest.xml

@@ -284,6 +284,16 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".util.SortedListActivity"
+                  android:label="@string/sorted_list_activity"
+                  android:windowSoftInputMode="adjustResize"
+                  android:theme="@style/Theme.AppCompat">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="com.example.android.supportv7.SAMPLE_CODE" />
+            </intent-filter>
+        </activity>
+
         <activity android:name=".widget.GridLayoutManagerActivity"
                   android:label="@string/grid_layout_manager"
                   android:theme="@style/Theme.AppCompat">

samples/Support7Demos/res/layout/activity_base_layout_manager.xml

@@ -56,4 +56,5 @@
             android:layout_width="fill_parent"
             android:layout_height="fill_parent"
             android:id="@+id/recycler_view"/>
+
 </LinearLayout>

samples/Support7Demos/res/layout/sorted_list_activity.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 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.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent">
+    <EditText
+            android:id="@+id/new_item_text_view"
+            style="@style/SortedListItem"
+            android:imeOptions="actionDone"
+            android:singleLine="true"
+            android:hint="@string/add_new_item"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"/>
+
+    <android.support.v7.widget.RecyclerView android:layout_width="match_parent"
+                                            android:layout_height="match_parent"
+                                            android:id="@+id/recycler_view"/>
+</LinearLayout>

samples/Support7Demos/res/layout/sorted_list_item_view.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 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.
+-->
+
+<CheckBox xmlns:android="http://schemas.android.com/apk/res/android"
+          style="@style/SortedListItem"
+          android:layout_width="match_parent"
+          android:layout_height="wrap_content">
+</CheckBox>

samples/Support7Demos/res/values/strings.xml

@@ -167,5 +167,7 @@
     <string name="palette">Palette</string>
     <string name="palette_all_colors">Full color palette</string>
     <string name="search_hint">Search...</string>
+    <string name="sorted_list_activity">Sorted List</string>
+    <string name="add_new_item">Add New Item</string>
 
 </resources>

samples/Support7Demos/res/values/styles.xml

@@ -29,4 +29,8 @@
         <item name="colorAccent">#ffff00</item>
     </style>
 
+    <style name="SortedListItem" parent="@android:style/TextAppearance.Medium">
+        <item name="android:minHeight">35dp</item>
+    </style>
+
 </resources>

samples/Support7Demos/src/com/example/android/supportv7/util/SortedListActivity.java

@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2015 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 com.example.android.supportv7.util;
+
+import com.example.android.supportv7.R;
+import android.os.Bundle;
+import android.support.v7.app.ActionBarActivity;
+import android.support.v7.util.SortedList;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.util.SortedListAdapterCallback;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.EditorInfo;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.EditText;
+import android.widget.TextView;
+
+/**
+ * A sample activity that uses {@link SortedList} in combination with RecyclerView.
+ */
+public class SortedListActivity extends ActionBarActivity {
+    private RecyclerView mRecyclerView;
+    private LinearLayoutManager mLinearLayoutManager;
+    private SortedListAdapter mAdapter;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.sorted_list_activity);
+        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
+        mRecyclerView.setHasFixedSize(true);
+        mLinearLayoutManager = new LinearLayoutManager(this);
+        mRecyclerView.setLayoutManager(mLinearLayoutManager);
+        mAdapter = new SortedListAdapter(getLayoutInflater(),
+                new Item("buy milk"), new Item("wash the car"),
+                new Item("wash the dishes"));
+        mRecyclerView.setAdapter(mAdapter);
+        mRecyclerView.setHasFixedSize(true);
+        final EditText newItemTextView = (EditText) findViewById(R.id.new_item_text_view);
+        newItemTextView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
+            @Override
+            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
+                if (id == EditorInfo.IME_ACTION_DONE &&
+                        (keyEvent == null || keyEvent.getAction() == KeyEvent.ACTION_DOWN)) {
+                    final String text = textView.getText().toString().trim();
+                    if (text.length() > 0) {
+                        mAdapter.addItem(new Item(text));
+                    }
+                    textView.setText("");
+                    return true;
+                }
+                return false;
+            }
+        });
+    }
+
+    private static class SortedListAdapter extends RecyclerView.Adapter<TodoViewHolder> {
+        SortedList<Item> mData;
+        final LayoutInflater mLayoutInflater;
+        public SortedListAdapter(LayoutInflater layoutInflater, Item... items) {
+            mLayoutInflater = layoutInflater;
+            mData = new SortedList<Item>(Item.class, new SortedListAdapterCallback<Item>(this) {
+                @Override
+                public int compare(Item t0, Item t1) {
+                    if (t0.mIsDone != t1.mIsDone) {
+                        return t0.mIsDone ? 1 : -1;
+                    }
+                    int txtComp = t0.mText.compareTo(t1.mText);
+                    if (txtComp != 0) {
+                        return txtComp;
+                    }
+                    if (t0.id < t1.id) {
+                        return -1;
+                    } else if (t0.id > t1.id) {
+                        return 1;
+                    }
+                    return 0;
+                }
+
+                @Override
+                public boolean areContentsTheSame(Item oldItem,
+                        Item newItem) {
+                    return oldItem.mText.equals(newItem.mText);
+                }
+
+                @Override
+                public boolean areItemsTheSame(Item item1, Item item2) {
+                    return item1.id == item2.id;
+                }
+            });
+            for (Item item : items) {
+                mData.add(item);
+            }
+        }
+
+        public void addItem(Item item) {
+            mData.add(item);
+        }
+
+        @Override
+        public TodoViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
+            return new TodoViewHolder (
+                    mLayoutInflater.inflate(R.layout.sorted_list_item_view, parent, false)) {
+                @Override
+                void onDoneChanged(boolean isDone) {
+                    int adapterPosition = getAdapterPosition();
+                    if (adapterPosition == RecyclerView.NO_POSITION) {
+                        return;
+                    }
+                    mBoundItem.mIsDone = isDone;
+                    mData.recalculatePositionOfItemAt(adapterPosition);
+                }
+            };
+        }
+
+        @Override
+        public void onBindViewHolder(TodoViewHolder holder, int position) {
+            holder.bindTo(mData.get(position));
+        }
+
+        @Override
+        public int getItemCount() {
+            return mData.size();
+        }
+    }
+
+    abstract private static class TodoViewHolder extends RecyclerView.ViewHolder {
+        final CheckBox mCheckBox;
+        Item mBoundItem;
+        public TodoViewHolder(View itemView) {
+            super(itemView);
+            mCheckBox = (CheckBox) itemView;
+            mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+                @Override
+                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                    if (mBoundItem != null && isChecked != mBoundItem.mIsDone) {
+                        onDoneChanged(isChecked);
+                    }
+                }
+            });
+        }
+
+        public void bindTo(Item item) {
+            mBoundItem = item;
+            mCheckBox.setText(item.mText);
+            mCheckBox.setChecked(item.mIsDone);
+        }
+
+        abstract void onDoneChanged(boolean isChecked);
+    }
+
+    private static class Item {
+        String mText;
+        boolean mIsDone = false;
+        final public int id;
+        private static int idCounter = 0;
+
+        public Item(String text) {
+            id = idCounter ++;
+            this.mText = text;
+        }
+    }
+}