Android RecyclerView实现下拉刷新和上拉加载
2019/7/7 19:47:38
本文主要是介绍Android RecyclerView实现下拉刷新和上拉加载,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
RecyclerView已经出来很久了,许许多多的项目都开始从ListView转战RecyclerView,那么,上拉加载和下拉刷新是一件很有必要的事情。
在ListView上,我们可以通过自己添加addHeadView和addFootView去添加头布局和底部局实现自定义的上拉和下拉,或者使用一些第三方库来简单的集成,例如Android-pulltorefresh或者android-Ultra-Pull-to-Refresh,后者的自定义更强,但需要自己实现上拉加载。
而在下面我们将用两种方式来实现上拉加载和下拉刷新
第一种方式:SwipeRefreshLayout+滑动底部自动加载
第二种方式:使用第三方库SwipeToLoadLayout实现上拉加载和下拉刷新。
第一种方式:SwipeRefreshLayout+滑动底部自动加载
SwipeRefreshLayout实现很简单,重点是滑动到底部自动加载应该如何实现,其实其实现的方式类似于ListView的实现方式。
看一下activity_recycle_swiperefresh.xml文件:
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/swipe_refresh" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.RecyclerView android:id="@+id/swipe_target" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="none" /> </android.support.v4.widget.SwipeRefreshLayout>
布局文件就两个控件,SwipeRefreshLayout中嵌套RecyclerView。
在代码中初始化RecyclerView以及实现adapter等,这不是重点,不再贴代码。
在RecyclerView中有方法addOnScrollListener,该方法类似于ListView的setOnScrollListener方法,OnScrollListener中有两个方法的回调
*onScrolled(RecyclerView recyclerView, int dx, int dy) :滚动的回调,dx和dy表示手指滑动水平和垂直的偏移量。
*onScrollStateChanged(RecyclerView recyclerView, int newState):滑动状态的回调。
那么,我们的着重点就在这个两个方法上了。
对于向上加载更多,我们需要有如下判断
--是否是向上滑动
--是否滑动到底部
--当前是否正在加载数据
--当前状态是否是滑动停止的状态
实现比较复杂,定义一个类LoadDataScrollController,继承类RecyclerView.OnScrollListener,
因为onScrollStateChanged实在状态改变时的回调,无法时时的获取显示的条目以及位置,所以我们在onScrolled中获取相应位置,
@Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { /** * 获取布局参数 */ RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); //如果为null,第一次运行,确定布局类型 if (mLayoutManagerType == null) { if (layoutManager instanceof LinearLayoutManager) { mLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT; } else if (layoutManager instanceof GridLayoutManager) { mLayoutManagerType = LayoutManagerType.GRID_LAYOUT; } else if (layoutManager instanceof StaggeredGridLayoutManager) { mLayoutManagerType = LayoutManagerType.STAGGERED_GRID_LAYOUT; } else { throw new RuntimeException("LayoutManager should be LinearLayoutManager,GridLayoutManager,StaggeredGridLayoutManager"); } } //对于不太能够的布局参数,不同的方法获取到当前显示的最后一个条目数 switch (mLayoutManagerType) { case LINEAR_LAYOUT: mLastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition(); break; case GRID_LAYOUT: mLastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition(); break; case STAGGERED_GRID_LAYOUT: StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager; if (mLastPostions == null) { mLastPostions = new int[staggeredGridLayoutManager.getSpanCount()]; } staggeredGridLayoutManager.findLastVisibleItemPositions(mLastPostions); mLastVisibleItemPosition = findMax(mLastPostions); break; default: break; } }
首先获取布局管理器,并判断是那种类型的,因为有三种类型,定义枚举来保存布局类型的参数
/** * * RecycleView的布局管理器的类型 * Created by Alex_MaHao on 2016/5/10. */ public enum LayoutManagerType { LINEAR_LAYOUT, GRID_LAYOUT, STAGGERED_GRID_LAYOUT }
然后根据布局惯例其的类型获取其当前显示的最大条目,对于瀑布流来说,他如果是垂直的两列瀑布的话,我们需要获取两列中分别最大条目数,进行比较,选出最大条目数。
/** * 当是瀑布流时,获取到的是每一个瀑布最下方显示的条目,通过条目进行对比 */ private int findMax(int[] lastPositions) { int max = lastPositions[0]; for (int value : lastPositions) { if (value > max) { max = value; } } return max; }
拿到当前最大的条目数之后,在onScrollStateChange中进行判断状态等,
@Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); //RecycleView 显示的条目数 int visibleCount = layoutManager.getChildCount(); //显示数据总数 int totalCount = layoutManager.getItemCount(); // 四个条件,分别是是否有数据,状态是否是滑动停止状态,显示的最大条目是否大于整个数据(注意偏移量),是否正在加载数据 if(visibleCount>0 &&newState==RecyclerView.SCROLL_STATE_IDLE &&mLastVisibleItemPosition>=totalCount-1 &&!isLoadData){ //可以加载数据 isLoadData = true; } }
注释很清楚,在加载数据的地方,我们将isLoadData设为true,同时利用接口回调加载数据,等数据加载完成,通过setLoadDataStatus方法设置为false
public void setLoadDataStatus(boolean isLoadData){ this.isLoadData = isLoadData; }
如果这样就结束了,感觉很麻烦,对于刷新和加载更多,我们需要在调用的地方分别设置监听,那么我们可以让LoadDataScrollController实现SwipeRefreshLayout的刷新监听方法,在利用我们定义的统一的上拉刷新和加载数据接口进行处理
/** * 实现上拉加载的监听:加载条件:滑动到最后,且是停止状态,则开始加载数据 * Created by Alex_MaHao on 2016/5/10. */ public class LoadDataScrollController extends RecyclerView.OnScrollListener implements SwipeRefreshLayout.OnRefreshListener { /** * 当前布局管理器的类型 */ private LayoutManagerType mLayoutManagerType; /** * 当前RecycleView显示的最大条目 */ private int mLastVisibleItemPosition; /** * 每列的最后一个条目 */ private int[] mLastPostions; /** * 是否正在加载数据 包括刷新和向上加载更多 */ private boolean isLoadData = false; /** * 回调接口 */ private OnRecycleRefreshListener mListener; public LoadDataScrollController(OnRecycleRefreshListener onRecycleRefreshListener) { this.mListener = onRecycleRefreshListener; } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { /** * 获取布局参数 */ RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); //如果为null,第一次运行,确定布局类型 if (mLayoutManagerType == null) { if (layoutManager instanceof LinearLayoutManager) { mLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT; } else if (layoutManager instanceof GridLayoutManager) { mLayoutManagerType = LayoutManagerType.GRID_LAYOUT; } else if (layoutManager instanceof StaggeredGridLayoutManager) { mLayoutManagerType = LayoutManagerType.STAGGERED_GRID_LAYOUT; } else { throw new RuntimeException("LayoutManager should be LinearLayoutManager,GridLayoutManager,StaggeredGridLayoutManager"); } } //对于不太能够的布局参数,不同的方法获取到当前显示的最后一个条目数 switch (mLayoutManagerType) { case LINEAR_LAYOUT: mLastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition(); break; case GRID_LAYOUT: mLastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition(); break; case STAGGERED_GRID_LAYOUT: StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager; if (mLastPostions == null) { mLastPostions = new int[staggeredGridLayoutManager.getSpanCount()]; } staggeredGridLayoutManager.findLastVisibleItemPositions(mLastPostions); mLastVisibleItemPosition = findMax(mLastPostions); break; default: break; } } @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); //RecycleView 显示的条目数 int visibleCount = layoutManager.getChildCount(); //显示数据总数 int totalCount = layoutManager.getItemCount(); // 四个条件,分别是是否有数据,状态是否是滑动停止状态,显示的最大条目是否大于整个数据(注意偏移量),是否正在加载数据 if(visibleCount>0 &&newState==RecyclerView.SCROLL_STATE_IDLE &&mLastVisibleItemPosition>=totalCount-1 &&!isLoadData){ //可以加载数据 if(mListener!=null){ isLoadData = true; mListener.loadMore(); } } } /** * 当是瀑布流时,获取到的是每一个瀑布最下方显示的条目,通过条目进行对比 */ private int findMax(int[] lastPositions) { int max = lastPositions[0]; for (int value : lastPositions) { if (value > max) { max = value; } } return max; } public void setLoadDataStatus(boolean isLoadData){ this.isLoadData = isLoadData; } @Override public void onRefresh() { //刷新数据的方法 if(mListener!=null){ isLoadData = true; mListener.refresh(); } } /** * 数据加载接口回调 */ interface OnRecycleRefreshListener{ void refresh(); void loadMore(); } }
最后看一下main的代码
/** * 使用原生的SwipeRefreshLayout和代码判断 * 实现RecyclewView 的刷新和加载更多 * * Created by Alex_MaHao on 2016/5/10. */ public class SwipeRefreshActivity extends AppCompatActivity implements LoadDataScrollController.OnRecycleRefreshListener { private SwipeRefreshLayout mSwipeRefresh; private RecyclerView mRecycle; private HomeAdapter mAdapter; private LoadDataScrollController mController; private ProgressDialog pd; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycle_swiperefresh); mRecycle = ((RecyclerView) findViewById(R.id.swipe_target)); mSwipeRefresh = ((SwipeRefreshLayout) findViewById(R.id.swipe_refresh)); mSwipeRefresh.setColorSchemeColors(Color.RED,Color.GREEN,Color.BLUE); /** * 创建控制器,同时使当前activity实现数据监听回调接口 */ mController = new LoadDataScrollController(this); mAdapter = new HomeAdapter(); //设置垂直的线性布局管理器,Orientation --> VERTICAL:垂直 HORIZONTAL:水平 LinearLayoutManager layoutManager = new LinearLayoutManager(this); layoutManager.setOrientation(LinearLayoutManager.VERTICAL); //StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL); //添加分割线 mRecycle.addItemDecoration(new DividerItemDecoration(getApplicationContext(), DividerItemDecoration.VERTICAL_LIST)); mRecycle.setLayoutManager(layoutManager); mRecycle.setItemAnimator(new DefaultItemAnimator()); mRecycle.setAdapter(mAdapter); mAdapter.refresh(); /** * 设置监听 */ mRecycle.addOnScrollListener(mController); mSwipeRefresh.setOnRefreshListener(mController); } @Override public void refresh() { //刷新的接口调 mSwipeRefresh.postDelayed(new Runnable() { @Override public void run() { mAdapter.refresh(); mSwipeRefresh.setRefreshing(false); mController.setLoadDataStatus(false); } },2000); } @Override public void loadMore() { //加载更多的接口回调 pd = new ProgressDialog(this); pd.show(); mSwipeRefresh.postDelayed(new Runnable() { @Override public void run() { mAdapter.add(); //设置数据加载结束的监听状态 mController.setLoadDataStatus(false); pd.dismiss(); } },2000); } }
贴个效果图
第二种方式:SwipeToLoadLayout实现上拉加载和下拉刷新
该刷新控件的方式类似于Ultra-pull-to-refresh的使用方式。
如下方式添加该库:
repositories { maven { url "https://jitpack.io" } } compile 'com.github.Aspsine:SwipeToLoadLayout:1.0.3'
首先我们需要自定义一个头视图和底部视图,头部试图和底部试图的用法相同,所以我们先定义一个头部视图类:
/** * 基础的refreshHeadView */ public class RefreshHeaderView extends TextView implements SwipeRefreshTrigger, SwipeTrigger { public RefreshHeaderView(Context context) { super(context); } public RefreshHeaderView(Context context, AttributeSet attrs) { super(context, attrs); } public RefreshHeaderView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) public RefreshHeaderView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override public void onRefresh() { //下拉到一定位置松开之后,调用此方法 setText("refresh"); Log.i("info","onRefresh"); } @Override public void onPrepare() { //下拉之前调用此方法 Log.i("info","onPrepare"); } @Override public void onMove(int yScrolled, boolean isComplete, boolean automatic) { if (!isComplete) { //当前Y轴偏移量大于控件高度时,标识下拉到界限,显示“松开已刷新” if (yScrolled >= getHeight()) { } else { //未达到偏移量 } } Log.i("info","onMove"); } @Override public void onRelease() { //达到一定滑动距离,松开刷新时调用 setText("onRelease"); Log.i("info","onRelease"); } @Override public void onComplete() { //加载完成之后调用此方法 setText("complete"); Log.i("info","onComplete"); } @Override public void onReset() { //重置 setText("onReset"); Log.i("info","onReset"); } }
其需要实现接口SwipeRefreshTrigger和SwipeTrigger。
而底部需要实现SwipeTrigger和SwipeLoadMoreTrigger。
布局文件中如下使用
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#ECEDF0" > <com.aspsine.swipetoloadlayout.SwipeToLoadLayout android:id="@+id/swipeToLoadLayout" android:layout_width="match_parent" android:layout_height="match_parent"> <com.mahao.alex.systemwidgetdemo.recycleView.swipetoloadlayout.RefreshHeaderView android:id="@+id/swipe_refresh_header" android:layout_width="match_parent" android:layout_height="wrap_content" /> <android.support.v7.widget.RecyclerView android:id="@+id/swipe_target" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="vertical" /> <com.mahao.alex.systemwidgetdemo.recycleView.swipetoloadlayout.LoaderMoreView android:id="@+id/swipe_load_more_footer" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="20dp" /> </com.aspsine.swipetoloadlayout.SwipeToLoadLayout> </RelativeLayout>
查找控件,设置监听
swipeToLoadLayout.setOnRefreshListener(this);
swipeToLoadLayout.setOnLoadMoreListener(this);
在我们之前的代码中,加入了log信息,我们可以看一下log信息。…代表多次onMove()方法多次调用。
05-10 10:30:34.396 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onPrepare
05-10 10:30:34.536 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onMove
..........................................................................
05-10 10:30:34.886 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onMove
05-10 10:30:34.896 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onRelease
05-10 10:30:34.906 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onMove
..........................................................................
05-10 10:30:35.086 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onMove
05-10 10:30:35.106 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onRefresh
05-10 10:30:37.116 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onComplete
05-10 10:30:37.416 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onMove
..........................................................................
05-10 10:30:37.516 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onMove
05-10 10:30:37.916 23814-23814/com.mahao.alex.systemwidgetdemo I/info: onReset
首先会调用onPrepare()方法,onMove()方法会一直调用,只要视图有偏移,就会调用。下拉到一定距离之后,松开调用onRelaease(),回归到刷新位置时回调onRefresh(),加载完成调用onComplete(),视图开始缩小,最后隐藏之后调用onReset()
根据需求自定义视图,
定义我们的椭圆,使用自定义控件
/** * CircleView 圆盘控件,可以旋转 * Created by Alex_MaHao on 2016/5/10. */ public class CircleView extends View { /** * 控件的半径 */ private int mRadius; /** * 绘制弧形的画笔 */ private Paint mArcPaint; /** * 绘制弧形的区域 */ private RectF mRange; private int[] colors = {Color.RED, Color.BLUE, Color.YELLOW, Color.GREEN}; public CircleView(Context context) { this(context, null, 0); } public CircleView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CircleView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { mArcPaint = new Paint(); mArcPaint.setAntiAlias(true); mArcPaint.setDither(true); mArcPaint.setStyle(Paint.Style.FILL); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int width = 0; int height = 0; int widthSize = MeasureSpec.getSize(widthMeasureSpec); int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); if (widthMode == MeasureSpec.EXACTLY) { width = widthSize; } else { width = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 45, getResources().getDisplayMetrics()); } if (heightMode == MeasureSpec.EXACTLY) { height = heightSize; } else { height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 45, getResources().getDisplayMetrics()); } //获取半径 mRadius = Math.min(width, height) / 2; /** * 设置宽高为固定值 */ setMeasuredDimension(mRadius * 2, mRadius * 2); mRange = new RectF(0, 0, mRadius * 2, mRadius * 2); } @Override protected void onDraw(Canvas canvas) { float degree = 360/colors.length/2f; for (int i = 0; i < 8; i++) { mArcPaint.setColor(colors[i%4]); canvas.drawArc(mRange,-90f+degree*i,degree,true,mArcPaint); } } }
绘制头部刷新试图
** * 自定义的下拉刷新控件 头部 * Created by Alex_MaHao on 2016/5/10. */ public class CircleRefreshHeaderView extends RelativeLayout implements SwipeTrigger, SwipeRefreshTrigger { CircleView mCircleView; TextView mDescText; private ObjectAnimator anim; private boolean isRelease; public CircleRefreshHeaderView(Context context) { this(context, null, 0); } public CircleRefreshHeaderView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CircleRefreshHeaderView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } /** * 初始化布局 */ private void initView() { int circlewidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 30, getResources().getDisplayMetrics()); mCircleView = new CircleView(getContext()); LinearLayout.LayoutParams circleParams = new LinearLayout.LayoutParams(circlewidth,circlewidth); mCircleView.setLayoutParams(circleParams); mDescText = new TextView(getContext()); LinearLayout.LayoutParams descParams = new LinearLayout.LayoutParams(circlewidth*3, ViewGroup.LayoutParams.WRAP_CONTENT); descParams.gravity = Gravity.CENTER; descParams.setMargins(circlewidth/2,0,0,0); mDescText.setLayoutParams(descParams); mDescText.setTextSize(12); mDescText.setTextColor(Color.GRAY); mDescText.setText("下拉刷新"); //添加线性的父布局 LinearLayout ll = new LinearLayout(getContext()); RelativeLayout.LayoutParams llParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); llParams.addRule(CENTER_IN_PARENT); ll.setLayoutParams(llParams); ll.setPadding(10,10,10,10); ll.addView(mCircleView); ll.addView(mDescText); addView(ll); } @Override public void onRefresh() { //开始刷新,启动动画 anim = ObjectAnimator.ofFloat(mCircleView, "rotation", mCircleView.getRotation(), mCircleView.getRotation()+360f) .setDuration(500); anim.setRepeatCount(ValueAnimator.INFINITE); anim.setRepeatMode(ValueAnimator.RESTART); anim.start(); mDescText.setText("正在加载数据"); } @Override public void onPrepare() { isRelease = false; } @Override public void onMove(int yScroll, boolean isComplete, boolean b1) { if (!isComplete) { if (yScroll < getHeight()) { mDescText.setText("下拉刷新"); } else { mDescText.setText("松开刷新更多"); } //如果是仍在下拉状态,则圆环跟随滑动进行滚动 if (!isRelease) mCircleView.setRotation(((float) yScroll) / getHeight() * 360f); } } @Override public void onRelease() { isRelease = true; } @Override public void onComplete() { anim.cancel(); mDescText.setText("加载完成"); } @Override public void onReset() { //重置时,将动画置为初始状态 mCircleView.setRotation(0f); } }
布局文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#ECEDF0" > <com.aspsine.swipetoloadlayout.SwipeToLoadLayout android:id="@+id/swipeToLoadLayout" android:layout_width="match_parent" android:layout_height="match_parent"> <com.mahao.alex.systemwidgetdemo.recycleView.swipetoloadlayout.CircleRefreshHeaderView android:id="@+id/swipe_refresh_header" android:layout_width="match_parent" android:layout_height="wrap_content" /> <android.support.v7.widget.RecyclerView android:id="@+id/swipe_target" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="vertical" /> <com.mahao.alex.systemwidgetdemo.recycleView.swipetoloadlayout.LoaderMoreView android:id="@+id/swipe_load_more_footer" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="20dp" /> </com.aspsine.swipetoloadlayout.SwipeToLoadLayout> </RelativeLayout>
public class SwipeToLayoutActivity extends AppCompatActivity implements OnRefreshListener, OnLoadMoreListener { private RecyclerView mRecycleView; SwipeToLoadLayout swipeToLoadLayout; private HomeAdapter adapter; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycle_swipetolayout); swipeToLoadLayout = ((SwipeToLoadLayout) findViewById(R.id.swipeToLoadLayout)); mRecycleView = ((RecyclerView) findViewById(R.id.swipe_target)); adapter = new HomeAdapter(); //设置垂直的线性布局管理器,Orientation --> VERTICAL:垂直 HORIZONTAL:水平 LinearLayoutManager layoutManager = new LinearLayoutManager(this); layoutManager.setOrientation(LinearLayoutManager.VERTICAL); // StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL); //添加分割线 mRecycleView.addItemDecoration(new DividerItemDecoration(getApplicationContext(), DividerItemDecoration.VERTICAL_LIST)); mRecycleView.setLayoutManager(layoutManager); mRecycleView.setItemAnimator(new DefaultItemAnimator()); mRecycleView.setAdapter(adapter); adapter.refresh(); /** * 设置下拉刷新和上拉加载监听 */ swipeToLoadLayout.setOnRefreshListener(this); swipeToLoadLayout.setOnLoadMoreListener(this); } @Override public void onRefresh() { swipeToLoadLayout.postDelayed(new Runnable() { @Override public void run() { adapter.refresh(); swipeToLoadLayout.setRefreshing(false); } },2000); } @Override public void onLoadMore() { swipeToLoadLayout.postDelayed(new Runnable() { @Override public void run() { adapter.add(); swipeToLoadLayout.setLoadingMore(false); } },2000); } }
OK。肯定有小伙伴使用该框架时一直报错,为什么,看框架的源码,有如下一段
this.mHeaderView = this.findViewById(id.swipe_refresh_header); this.mTargetView = this.findViewById(id.swipe_target); this.mFooterView = this.findViewById(id.swipe_load_more_footer);
可以看出,作者是根据固定的id值获取的,所以在我们的布局文件中,必须使用固定的三个id。
如有需求,可移步我的github获取源码,源码在systemwidgetdemo中。
以上就是本文的全部内容,希望对大家学习Android软件编程有所帮助。
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