柚子快报激活码778899分享：RecyclerView
话说RecyclerView已经出生非常长时间了特点和ListView,GridView类似。长处是：（使用更加灵活、item能够直接使用动画等..）那么今天開始我们来重点学习一下RecyclerView控件。以下直接上代码：
1. 创建一个新项目
1.在Android studio中，通过 File
⇒ New Project
2.加入依赖
build.gradle
dependencies {
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
xmlns: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"
android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="vertical" /> 4.打开colors.xml位置在res ⇒ values colors.xml 2.写适配器 5.自己定义一个实体类 Movie.java package 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文件夹。这个文件用于在RecyclerView中显示用到的item movie_list_row.xml 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"> android: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" /> android:id="@+id/genre" android:layout_below="@id/title" android:layout_width="match_parent" android:layout_height="wrap_content" /> android:id="@+id/year" android:textColor="@color/year" android:layout_width="wrap_content" android:layout_alignParentRight="true" android:layout_height="wrap_content" /> 7.如今创建类MoviesAdapter加入下面代码。HereonCreateViewHolder()方法用于载入movie_list_row.xml.在onBindViewHolder()为了适配数据（title, genre和year) MoviesAdapter.java package 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 private List 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 this.moviesList = moviesList; } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()) .inflate(R.layout.movie_list_row, parent, false); return new MyViewHolder(itemView); } @Override public 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()); } @Override public int getItemCount() { return moviesList.size(); } } 8.打开MainActivity做下面改变，prepareMovieData()这种方法加入了一些数据在列表中. MainActivity.java 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 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.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(); } } 这是我的执行结果： 3.给你的RecyclerView加入切割线 9.创建DividerItemDecoration DividerItemDecoration.java package 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加入切割线 recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL)); // set the adapter recyclerView.setAdapter(mAdapter); 我的App执行结果是： 4.为RecyclerView Item 加入点击事件 RecyclerView 默认没有OnItemClickListener方法。我们须要自己写;RecyclerView.OnItemTouchListener 11.在MainActivity加入RecyclerTouchListener类，ClickListener接口 MainActivity.java 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) { } } 最后为RecyClerView加入监听 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) { } })); 如今你能够验证点击事件了，我的执行结果: 最后贴出Activity全部代码： 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 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) { } } } 柚子快报激活码778899分享：RecyclerView 好文链接
发表评论