RecyclerView
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话说RecyclerView已经出生很长时间了特点和ListView,GridView类似。优点是:(使用更加灵活、item可以直接使用动画等..)那么今天开始我们来重点学习一下RecyclerView控件。下面直接上代码:
1. 创建一个新项目
1.在Android studio中,通过 File ⇒ New Project
2.添加依赖
build.gradledependencies {compile fileTree(dir: 'libs', include: ['*.jar'])testCompile 'junit:junit:4.12'compile 'com.android.support:appcompat-v7:23.1.1'compile 'com.android.support:design:23.1.1'compile 'com.android.support:recyclerview-v7:23.1.1'}
3.默认会有两个文件activity_main.xml(CoordinatorLayout、AppBarLayout)和content_main.xml(项目用到的内容)
content_main.xml<?xml version="1.0" encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"app:layout_behavior="@string/appbar_scrolling_view_behavior"tools:showIn="@layout/activity_main"<div style="text-align: left;"></div>tools:context=".MainActivity"><android.support.v7.widget.RecyclerViewandroid:id="@+id/recycler_view"android:layout_width="match_parent"android:layout_height="wrap_content"android:scrollbars="vertical" /></RelativeLayout>
4.打开colors.xml位置在res ⇒ values
colors.xml<?xml version="1.0" encoding="utf-8"?><resources><color name="colorPrimary">#3F51B5</color><color name="colorPrimaryDark">#303F9F</color><color name="colorAccent">#FF4081</color><color name="year">#999999</color><color name="title">#222222</color></resources>
2.写适配器
5.自定义一个实体类
Movie.javapackage info.androidhive.recyclerview;public class Movie {private String title, genre, year;public Movie() {}public Movie(String title, String genre, String year) {this.title = title;this.genre = genre;this.year = year;}public String getTitle() {return title;}public void setTitle(String name) {this.title = name;}public String getYear() {return year;}public void setYear(String year) {this.year = year;}public String getGenre() {return genre;}public void setGenre(String genre) {this.genre = genre;}}
6.创建一个movie_list_row.xml在Layout目录,这个文件用于在RecyclerView中显示用到的item
movie_list_row.xml<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:focusable="true"android:paddingLeft="16dp"android:paddingRight="16dp"android:paddingTop="10dp"android:paddingBottom="10dp"android:clickable="true"android:background="?android:attr/selectableItemBackground"android:orientation="vertical"><TextViewandroid:id="@+id/title"android:textColor="@color/title"android:textSize="16dp"android:textStyle="bold"android:layout_alignParentTop="true"android:layout_width="match_parent"android:layout_height="wrap_content" /><TextViewandroid:id="@+id/genre"android:layout_below="@id/title"android:layout_width="match_parent"android:layout_height="wrap_content" /><TextViewandroid:id="@+id/year"android:textColor="@color/year"android:layout_width="wrap_content"android:layout_alignParentRight="true"android:layout_height="wrap_content" /></RelativeLayout>
MoviesAdapter.javapackage info.androidhive.recyclerview;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.List;public class MoviesAdapter extends RecyclerView.Adapter<MoviesAdapter.MyViewHolder> {private List<Movie> moviesList;public class MyViewHolder extends RecyclerView.ViewHolder {public TextView title, year, genre;public MyViewHolder(View view) {super(view);title = (TextView) view.findViewById(R.id.title);genre = (TextView) view.findViewById(R.id.genre);year = (TextView) view.findViewById(R.id.year);}}public MoviesAdapter(List<Movie> moviesList) {this.moviesList = moviesList;}@Overridepublic MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.movie_list_row, parent, false);return new MyViewHolder(itemView);}@Overridepublic void onBindViewHolder(MyViewHolder holder, int position) {Movie movie = moviesList.get(position);holder.title.setText(movie.getTitle());holder.genre.setText(movie.getGenre());holder.year.setText(movie.getYear());}@Overridepublic int getItemCount() {return moviesList.size();}}
8.打开MainActivity做以下改变,prepareMovieData()这个方法添加了一些数据在列表中.
MainActivity.javapackage info.androidhive.recyclerview;import android.content.Context;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.DefaultItemAnimator;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.Toolbar;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {private List<Movie> movieList = new ArrayList<>();private RecyclerView recyclerView;private MoviesAdapter mAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);setSupportActionBar(toolbar);recyclerView = (RecyclerView) findViewById(R.id.recycler_view);mAdapter = new MoviesAdapter(movieList);RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());recyclerView.setLayoutManager(mLayoutManager);recyclerView.setItemAnimator(new DefaultItemAnimator());recyclerView.setAdapter(mAdapter);prepareMovieData();}private void prepareMovieData() {Movie movie = new Movie("Mad Max: Fury Road", "Action & Adventure", "2015");movieList.add(movie);movie = new Movie("Inside Out", "Animation, Kids & Family", "2015");movieList.add(movie);movie = new Movie("Star Wars: Episode VII - The Force Awakens", "Action", "2015");movieList.add(movie);movie = new Movie("Shaun the Sheep", "Animation", "2015");movieList.add(movie);movie = new Movie("The Martian", "Science Fiction & Fantasy", "2015");movieList.add(movie);movie = new Movie("Mission: Impossible Rogue Nation", "Action", "2015");movieList.add(movie);movie = new Movie("Up", "Animation", "2009");movieList.add(movie);movie = new Movie("Star Trek", "Science Fiction", "2009");movieList.add(movie);movie = new Movie("The LEGO Movie", "Animation", "2014");movieList.add(movie);movie = new Movie("Iron Man", "Action & Adventure", "2008");movieList.add(movie);movie = new Movie("Aliens", "Science Fiction", "1986");movieList.add(movie);movie = new Movie("Chicken Run", "Animation", "2000");movieList.add(movie);movie = new Movie("Back to the Future", "Science Fiction", "1985");movieList.add(movie);movie = new Movie("Raiders of the Lost Ark", "Action & Adventure", "1981");movieList.add(movie);movie = new Movie("Goldfinger", "Action & Adventure", "1965");movieList.add(movie);movie = new Movie("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014");movieList.add(movie);mAdapter.notifyDataSetChanged();}}
这是我的运行结果:
3.给你的RecyclerView添加分割线
9.创建DividerItemDecoration
DividerItemDecoration.javapackage info.androidhive.recyclerview; import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View; /** * Created by Lincoln on 30/10/15. */public class DividerItemDecoration extends RecyclerView.ItemDecoration { private static final int[] ATTRS = new int[]{ android.R.attr.listDivider }; public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL; public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL; private Drawable mDivider; private int mOrientation; public DividerItemDecoration(Context context, int orientation) { final TypedArray a = context.obtainStyledAttributes(ATTRS); mDivider = a.getDrawable(0); a.recycle(); setOrientation(orientation); } public void setOrientation(int orientation) { if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) { throw new IllegalArgumentException("invalid orientation"); } mOrientation = orientation; } @Override public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) { if (mOrientation == VERTICAL_LIST) { drawVertical(c, parent); } else { drawHorizontal(c, parent); } } public void drawVertical(Canvas c, RecyclerView parent) { final int left = parent.getPaddingLeft(); final int right = parent.getWidth() - parent.getPaddingRight(); final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { final View child = parent.getChildAt(i); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams(); final int top = child.getBottom() + params.bottomMargin; final int bottom = top + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } } public void drawHorizontal(Canvas c, RecyclerView parent) { final int top = parent.getPaddingTop(); final int bottom = parent.getHeight() - parent.getPaddingBottom(); final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { final View child = parent.getChildAt(i); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams(); final int left = child.getRight() + params.rightMargin; final int right = left + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } } @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { if (mOrientation == VERTICAL_LIST) { outRect.set(0, 0, 0, mDivider.getIntrinsicHeight()); } else { outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0); } }}
10.打开MainActivity通过addItemDecoration()方法为item添加分割线
recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL)); // set the adapterrecyclerView.setAdapter(mAdapter);
我的App运行结果是:
4.为RecyclerView Item 添加点击事件
RecyclerView 默认没有OnItemClickListener方法,我们需要自己写;RecyclerView.OnItemTouchListener
11.在MainActivity添加RecyclerTouchListener类,ClickListener接口
MainActivity.javapublic interface ClickListener { void onClick(View view, int position); void onLongClick(View view, int position); } public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener { private GestureDetector gestureDetector; private MainActivity.ClickListener clickListener; public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final MainActivity.ClickListener clickListener) { this.clickListener = clickListener; gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { @Override public boolean onSingleTapUp(MotionEvent e) { return true; } @Override public void onLongPress(MotionEvent e) { View child = recyclerView.findChildViewUnder(e.getX(), e.getY()); if (child != null && clickListener != null) { clickListener.onLongClick(child, recyclerView.getChildPosition(child)); } } }); } @Override public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { View child = rv.findChildViewUnder(e.getX(), e.getY()); if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) { clickListener.onClick(child, rv.getChildPosition(child)); } return false; } @Override public void onTouchEvent(RecyclerView rv, MotionEvent e) { } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { } }
recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new ClickListener() { @Override public void onClick(View view, int position) { Movie movie = movieList.get(position); Toast.makeText(getApplicationContext(), movie.getTitle() + " is selected!", Toast.LENGTH_SHORT).show(); } @Override public void onLongClick(View view, int position) { } }));
现在你可以验证点击事件了,我的运行结果:
最后贴出Activity所有代码:
package info.androidhive.recyclerview; import android.content.Context;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.DefaultItemAnimator;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.Toolbar;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.widget.Toast; import java.util.ArrayList;import java.util.List; public class MainActivity extends AppCompatActivity { private List<Movie> movieList = new ArrayList<>(); private RecyclerView recyclerView; private MoviesAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); recyclerView = (RecyclerView) findViewById(R.id.recycler_view); mAdapter = new MoviesAdapter(movieList); recyclerView.setHasFixedSize(true); RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); recyclerView.setLayoutManager(mLayoutManager); recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL)); recyclerView.setItemAnimator(new DefaultItemAnimator()); recyclerView.setAdapter(mAdapter); recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new ClickListener() { @Override public void onClick(View view, int position) { Movie movie = movieList.get(position); Toast.makeText(getApplicationContext(), movie.getTitle() + " is selected!", Toast.LENGTH_SHORT).show(); } @Override public void onLongClick(View view, int position) { } })); prepareMovieData(); } private void prepareMovieData() { Movie movie = new Movie("Mad Max: Fury Road", "Action & Adventure", "2015"); movieList.add(movie); movie = new Movie("Inside Out", "Animation, Kids & Family", "2015"); movieList.add(movie); movie = new Movie("Star Wars: Episode VII - The Force Awakens", "Action", "2015"); movieList.add(movie); movie = new Movie("Shaun the Sheep", "Animation", "2015"); movieList.add(movie); movie = new Movie("The Martian", "Science Fiction & Fantasy", "2015"); movieList.add(movie); movie = new Movie("Mission: Impossible Rogue Nation", "Action", "2015"); movieList.add(movie); movie = new Movie("Up", "Animation", "2009"); movieList.add(movie); movie = new Movie("Star Trek", "Science Fiction", "2009"); movieList.add(movie); movie = new Movie("The LEGO Movie", "Animation", "2014"); movieList.add(movie); movie = new Movie("Iron Man", "Action & Adventure", "2008"); movieList.add(movie); movie = new Movie("Aliens", "Science Fiction", "1986"); movieList.add(movie); movie = new Movie("Chicken Run", "Animation", "2000"); movieList.add(movie); movie = new Movie("Back to the Future", "Science Fiction", "1985"); movieList.add(movie); movie = new Movie("Raiders of the Lost Ark", "Action & Adventure", "1981"); movieList.add(movie); movie = new Movie("Goldfinger", "Action & Adventure", "1965"); movieList.add(movie); movie = new Movie("Guardians of the Galaxy", "Science Fiction & Fantasy", "2014"); movieList.add(movie); mAdapter.notifyDataSetChanged(); } public interface ClickListener { void onClick(View view, int position); void onLongClick(View view, int position); } public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener { private GestureDetector gestureDetector; private MainActivity.ClickListener clickListener; public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final MainActivity.ClickListener clickListener) { this.clickListener = clickListener; gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { @Override public boolean onSingleTapUp(MotionEvent e) { return true; } @Override public void onLongPress(MotionEvent e) { View child = recyclerView.findChildViewUnder(e.getX(), e.getY()); if (child != null && clickListener != null) { clickListener.onLongClick(child, recyclerView.getChildPosition(child)); } } }); } @Override public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { View child = rv.findChildViewUnder(e.getX(), e.getY()); if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) { clickListener.onClick(child, rv.getChildPosition(child)); } return false; } @Override public void onTouchEvent(RecyclerView rv, MotionEvent e) { } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { } } }
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