Add demo for animating RecyclerView actions
Change-Id: Ieb14cfb627663f507c24205d697347a1da389094
This commit is contained in:
Chet Haase
@@ -183,6 +183,15 @@
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</intent-filter>
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</activity>
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<activity android:name=".widget.AnimatedRecyclerView"
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android:label="@string/animated_recycler_view"
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android:theme="@style/Theme.AppCompat">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="com.example.android.supportv7.SAMPLE_CODE" />
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</intent-filter>
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</activity>
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<activity android:name=".widget.LinearLayoutManagerActivity"
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android:label="@string/linear_layout_manager"
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android:theme="@style/Theme.AppCompat">
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52
samples/Support7Demos/res/layout/animated_recycler_view.xml
Normal file
52
samples/Support7Demos/res/layout/animated_recycler_view.xml
Normal file
@@ -0,0 +1,52 @@
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical"
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android:id="@+id/container"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="horizontal"
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android:layout_width="match_parent"
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android:layout_height="wrap_content">
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<Button
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android:id="@+id/deleteButton"
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android:layout_weight=".5"
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android:layout_width="0dip"
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android:layout_height="wrap_content"
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android:onClick="deleteItem"
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android:text="@string/delete_item"/>
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<Button
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android:layout_weight=".5"
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android:layout_width="0dip"
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android:layout_height="wrap_content"
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android:onClick="addItem"
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android:text="@string/add_item"/>
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<Button
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android:layout_weight=".5"
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android:layout_width="0dip"
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android:layout_height="wrap_content"
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android:onClick="addDeleteItem"
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android:text="@string/add_delete_item"/>
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<Button
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android:layout_weight=".5"
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android:layout_width="0dip"
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android:layout_height="wrap_content"
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android:onClick="deleteAddItem"
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android:text="@string/delete_add_item"/>
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<Button
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android:layout_weight=".5"
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android:layout_width="0dip"
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android:layout_height="wrap_content"
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android:onClick="d1a2d3"
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android:text="@string/d1a2d3"/>
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</LinearLayout>
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</LinearLayout>
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19
samples/Support7Demos/res/layout/selectable_item.xml
Normal file
19
samples/Support7Demos/res/layout/selectable_item.xml
Normal file
@@ -0,0 +1,19 @@
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="horizontal"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<CheckBox
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android:id="@+id/selected"
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android:onClick="checkboxClicked"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"/>
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<TextView
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android:id="@+id/text"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"/>
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</LinearLayout>
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@@ -95,10 +95,17 @@
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<string name="sample_media_route_activity_local">Local Playback</string>
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<string name="sample_media_route_activity_presentation">Local Playback on Presentation Display</string>
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<string name="recycler_view">RecyclerView</string>
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<string name="recycler_view">RecyclerView/RecyclerViewActivity</string>
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<string name="animated_recycler_view">RecyclerView/AnimatedRecyclerView</string>
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<string name="linear_layout_manager">Linear Layout Manager</string>
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<string name="checkbox_orientation">Horz.</string>
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<string name="checkbox_reverse">Rev.</string>
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<string name="checkbox_layout_dir">Layout Dir</string>
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<string name="checkbox_stack_from_end">Stack From End</string>
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<string name="add_item">Add</string>
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<string name="delete_item">Delete</string>
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<string name="add_delete_item">A+D</string>
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<string name="delete_add_item">D+A</string>
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<string name="d1a2d3">d1a2d3</string>
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</resources>
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@@ -0,0 +1,445 @@
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/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.supportv7.widget;
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import com.example.android.supportv7.R;
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import android.app.Activity;
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import android.content.Context;
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import android.os.Bundle;
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import android.support.v4.view.MenuItemCompat;
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import android.support.v7.widget.RecyclerView;
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import android.util.DisplayMetrics;
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import android.util.TypedValue;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.CheckBox;
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import android.widget.TextView;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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public class AnimatedRecyclerView extends Activity {
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private static final int SCROLL_DISTANCE = 80; // dp
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private RecyclerView mRecyclerView;
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private int mNumItemsAdded = 0;
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ArrayList<String> mItems = new ArrayList<String>();
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MyAdapter mAdapter;
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static final boolean USE_CUSTOM_ANIMATIONS = false;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.animated_recycler_view);
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ViewGroup container = (ViewGroup) findViewById(R.id.container);
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mRecyclerView = new RecyclerView(this);
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mRecyclerView.setLayoutManager(new MyLayoutManager(this));
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mRecyclerView.setHasFixedSize(true);
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mRecyclerView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.MATCH_PARENT));
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for (int i = 0; i < 6; ++i) {
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mItems.add("Item #" + i);
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}
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mAdapter = new MyAdapter(mItems);
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mRecyclerView.setAdapter(mAdapter);
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container.addView(mRecyclerView);
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}
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@Override
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public boolean onCreateOptionsMenu(Menu menu) {
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super.onCreateOptionsMenu(menu);
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MenuItemCompat.setShowAsAction(menu.add("Layout"), MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
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return true;
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}
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@Override
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public boolean onOptionsItemSelected(MenuItem item) {
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mRecyclerView.requestLayout();
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return super.onOptionsItemSelected(item);
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}
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public void checkboxClicked(View view) {
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ViewGroup parent = (ViewGroup) view.getParent();
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boolean selected = ((CheckBox) view).isChecked();
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int index = mRecyclerView.indexOfChild(parent);
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MyViewHolder holder = (MyViewHolder) mRecyclerView.getViewHolderForChildAt(index);
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mAdapter.selectItem(holder, selected);
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}
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public void deleteItem(View view) {
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int numItems = mItems.size();
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if (numItems > 0) {
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for (int i = numItems - 1; i >= 0; --i) {
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final String itemText = mItems.get(i);
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boolean selected = mAdapter.mSelected.get(itemText);
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if (selected) {
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removeAtPosition(i);
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}
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}
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}
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}
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private String generateNewText() {
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return "Added Item #" + mNumItemsAdded++;
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}
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public void d1a2d3(View view) {
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removeAtPosition(1);
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addAtPosition(2, "Added Item #" + mNumItemsAdded++);
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removeAtPosition(3);
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}
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private void removeAtPosition(int position) {
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mItems.remove(position);
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mAdapter.notifyItemRemoved(position);
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}
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private void addAtPosition(int position, String text) {
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mItems.add(position, text);
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mAdapter.mSelected.put(text, Boolean.FALSE);
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mAdapter.notifyItemInserted(position);
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}
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public void addDeleteItem(View view) {
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addItem(view);
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deleteItem(view);
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}
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public void deleteAddItem(View view) {
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deleteItem(view);
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addItem(view);
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}
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public void addItem(View view) {
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addAtPosition(3, "Added Item #" + mNumItemsAdded++);
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}
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/**
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* A basic ListView-style LayoutManager.
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*/
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class MyLayoutManager extends RecyclerView.LayoutManager {
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private static final String TAG = "MyLayoutManager";
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private int mFirstPosition;
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private final int mScrollDistance;
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public MyLayoutManager(Context c) {
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final DisplayMetrics dm = c.getResources().getDisplayMetrics();
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mScrollDistance = (int) (SCROLL_DISTANCE * dm.density + 0.5f);
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}
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@Override
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public void onLayoutChildren(RecyclerView.Adapter adapter, RecyclerView.Recycler recycler,
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boolean structureChanged, RecyclerView.State state) {
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int parentBottom = getHeight() - getPaddingBottom();
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final View oldTopView = getChildCount() > 0 ? getChildAt(0) : null;
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int oldTop = getPaddingTop();
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if (oldTopView != null) {
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oldTop = Math.min(oldTopView.getTop(), oldTop);
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}
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// Note that we add everything to the scrap, but we do not clean it up;
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// that is handled by the RecyclerView after this method returns
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detachAndScrapAttachedViews(recycler);
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int top = oldTop;
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int bottom = top;
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final int left = getPaddingLeft();
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final int right = getWidth() - getPaddingRight();
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int count = adapter.getItemCount();
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for (int i = 0; mFirstPosition + i < count && top < parentBottom; i++, top = bottom) {
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View v = recycler.getViewForPosition(adapter, mFirstPosition + i);
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if (v == null) {
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continue;
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}
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RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) v.getLayoutParams();
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if (!params.isItemRemoved()) {
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addView(v);
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}
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measureChild(v, 0, 0);
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bottom = top + v.getMeasuredHeight();
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v.layout(left, top, right, bottom);
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if (params.isItemRemoved()) {
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parentBottom += v.getHeight();
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count += 1;
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}
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}
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// Now that we've run a full layout, figure out which views were not used
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// (cached in previousViews). For each of these views, position it where
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// it would go, according to its position relative to the visible
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// positions in the list. This information will be used by RecyclerView to
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// record post-layout positions of these items for the purposes of animating them
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// out of view
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View lastVisibleView = getChildAt(getChildCount() - 1);
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if (lastVisibleView != null) {
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RecyclerView.LayoutParams lastParams =
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(RecyclerView.LayoutParams) lastVisibleView.getLayoutParams();
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int lastPosition = lastParams.getViewPosition();
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final List<RecyclerView.ViewHolder> previousViews = recycler.getScrapList();
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count = previousViews.size();
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for (int i = 0; i < count; ++i) {
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View view = previousViews.get(i).itemView;
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RecyclerView.LayoutParams params =
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(RecyclerView.LayoutParams) view.getLayoutParams();
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int position = params.getViewPosition();
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int newTop;
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if (position < mFirstPosition) {
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newTop = view.getHeight() * (position - mFirstPosition);
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} else {
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newTop = lastVisibleView.getTop() + view.getHeight() *
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(position - lastPosition);
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}
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view.offsetTopAndBottom(newTop - view.getTop());
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}
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}
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}
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@Override
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public RecyclerView.LayoutParams generateDefaultLayoutParams() {
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return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.WRAP_CONTENT);
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}
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@Override
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public boolean canScrollVertically() {
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return true;
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}
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@Override
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public int scrollVerticallyBy(int dy, RecyclerView.Adapter adapter,
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RecyclerView.Recycler recycler) {
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if (getChildCount() == 0) {
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return 0;
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}
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int scrolled = 0;
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final int left = getPaddingLeft();
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final int right = getWidth() - getPaddingRight();
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if (dy < 0) {
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while (scrolled > dy) {
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final View topView = getChildAt(0);
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final int hangingTop = Math.max(-topView.getTop(), 0);
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final int scrollBy = Math.min(scrolled - dy, hangingTop);
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scrolled -= scrollBy;
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offsetChildrenVertical(scrollBy);
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if (mFirstPosition > 0 && scrolled > dy) {
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mFirstPosition--;
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View v = recycler.getViewForPosition(adapter, mFirstPosition);
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addView(v, 0);
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measureChild(v, 0, 0);
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final int bottom = topView.getTop(); // TODO decorated top?
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final int top = bottom - v.getMeasuredHeight();
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v.layout(left, top, right, bottom);
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} else {
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break;
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}
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}
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} else if (dy > 0) {
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final int parentHeight = getHeight();
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while (scrolled < dy) {
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final View bottomView = getChildAt(getChildCount() - 1);
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final int hangingBottom = Math.max(bottomView.getBottom() - parentHeight, 0);
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final int scrollBy = -Math.min(dy - scrolled, hangingBottom);
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scrolled -= scrollBy;
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offsetChildrenVertical(scrollBy);
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if (scrolled < dy && getItemCount() > mFirstPosition + getChildCount()) {
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View v = recycler.getViewForPosition(adapter,
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mFirstPosition + getChildCount());
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final int top = getChildAt(getChildCount() - 1).getBottom();
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addView(v);
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measureChild(v, 0, 0);
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final int bottom = top + v.getMeasuredHeight();
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v.layout(left, top, right, bottom);
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} else {
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break;
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}
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}
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}
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recycleViewsOutOfBounds(recycler);
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return scrolled;
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}
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@Override
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public View onFocusSearchFailed(View focused, int direction,
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RecyclerView.Adapter adapter, RecyclerView.Recycler recycler) {
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final int oldCount = getChildCount();
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if (oldCount == 0) {
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return null;
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}
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final int left = getPaddingLeft();
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final int right = getWidth() - getPaddingRight();
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View toFocus = null;
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int newViewsHeight = 0;
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if (direction == View.FOCUS_UP || direction == View.FOCUS_BACKWARD) {
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while (mFirstPosition > 0 && newViewsHeight < mScrollDistance) {
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mFirstPosition--;
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View v = recycler.getViewForPosition(adapter, mFirstPosition);
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final int bottom = getChildAt(0).getTop(); // TODO decorated top?
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addView(v, 0);
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measureChild(v, 0, 0);
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final int top = bottom - v.getMeasuredHeight();
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v.layout(left, top, right, bottom);
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if (v.isFocusable()) {
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toFocus = v;
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break;
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}
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}
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}
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if (direction == View.FOCUS_DOWN || direction == View.FOCUS_FORWARD) {
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while (mFirstPosition + getChildCount() < getItemCount() &&
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newViewsHeight < mScrollDistance) {
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View v = recycler.getViewForPosition(adapter, mFirstPosition + getChildCount());
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final int top = getChildAt(getChildCount() - 1).getBottom();
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addView(v);
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measureChild(v, 0, 0);
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final int bottom = top + v.getMeasuredHeight();
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v.layout(left, top, right, bottom);
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if (v.isFocusable()) {
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toFocus = v;
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break;
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}
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}
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}
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return toFocus;
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}
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public void recycleViewsOutOfBounds(RecyclerView.Recycler recycler) {
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final int childCount = getChildCount();
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final int parentWidth = getWidth();
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final int parentHeight = getHeight();
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boolean foundFirst = false;
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int first = 0;
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int last = 0;
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for (int i = 0; i < childCount; i++) {
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final View v = getChildAt(i);
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if (v.hasFocus() || (v.getRight() >= 0 && v.getLeft() <= parentWidth &&
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v.getBottom() >= 0 && v.getTop() <= parentHeight)) {
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if (!foundFirst) {
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first = i;
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foundFirst = true;
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}
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last = i;
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}
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}
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for (int i = childCount - 1; i > last; i--) {
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removeAndRecycleViewAt(i, recycler);
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}
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for (int i = first - 1; i >= 0; i--) {
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removeAndRecycleViewAt(i, recycler);
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}
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if (getChildCount() == 0) {
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mFirstPosition = 0;
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} else {
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mFirstPosition += first;
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}
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}
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@Override
|
||||
public void onItemsAdded(RecyclerView recyclerView, int positionStart, int itemCount) {
|
||||
if (positionStart < mFirstPosition) {
|
||||
mFirstPosition += itemCount;
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) {
|
||||
if (positionStart < mFirstPosition) {
|
||||
mFirstPosition -= itemCount;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
class MyAdapter extends RecyclerView.Adapter {
|
||||
private int mBackground;
|
||||
List<String> mData;
|
||||
HashMap<String, Boolean> mSelected = new HashMap<String, Boolean>();
|
||||
|
||||
public MyAdapter(List<String> data) {
|
||||
TypedValue val = new TypedValue();
|
||||
AnimatedRecyclerView.this.getTheme().resolveAttribute(
|
||||
R.attr.selectableItemBackground, val, true);
|
||||
mBackground = val.resourceId;
|
||||
mData = data;
|
||||
for (String itemText : mData) {
|
||||
mSelected.put(itemText, Boolean.FALSE);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
|
||||
MyViewHolder h = new MyViewHolder(getLayoutInflater().inflate(R.layout.selectable_item,
|
||||
null));
|
||||
h.textView.setMinimumHeight(128);
|
||||
h.textView.setFocusable(true);
|
||||
h.textView.setBackgroundResource(mBackground);
|
||||
return h;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
|
||||
String itemText = mData.get(position);
|
||||
((MyViewHolder) holder).textView.setText(itemText);
|
||||
boolean selected = false;
|
||||
if (mSelected.get(itemText) != null) {
|
||||
selected = mSelected.get(itemText);
|
||||
}
|
||||
((MyViewHolder) holder).checkBox.setChecked(selected);
|
||||
}
|
||||
|
||||
@Override
|
||||
public int getItemCount() {
|
||||
return mData.size();
|
||||
}
|
||||
|
||||
public void selectItem(String itemText, boolean selected) {
|
||||
mSelected.put(itemText, selected);
|
||||
}
|
||||
|
||||
public void selectItem(MyViewHolder holder, boolean selected) {
|
||||
mSelected.put((String) holder.textView.getText(), selected);
|
||||
}
|
||||
}
|
||||
|
||||
static class MyViewHolder extends RecyclerView.ViewHolder {
|
||||
public TextView textView;
|
||||
public CheckBox checkBox;
|
||||
|
||||
public MyViewHolder(View v) {
|
||||
super(v);
|
||||
textView = (TextView) v.findViewById(R.id.text);
|
||||
checkBox = (CheckBox) v.findViewById(R.id.selected);
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return super.toString() + " \"" + textView.getText() + "\"";
|
||||
}
|
||||
}}
|
||||
@@ -101,6 +101,12 @@ public class RecyclerViewActivity extends Activity {
|
||||
mScrollDistance = (int) (SCROLL_DISTANCE * dm.density + 0.5f);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void onLayoutChildren(RecyclerView.Adapter adapter, RecyclerView.Recycler recycler,
|
||||
boolean structureChanged, RecyclerView.State state) {
|
||||
layoutChildren(adapter, recycler, structureChanged);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void layoutChildren(RecyclerView.Adapter adapter, RecyclerView.Recycler recycler,
|
||||
boolean structureChanged) {
|
||||
|
||||
Reference in New Issue
Block a user