RecyclerView 下拉刷新和上拉加载
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
SwipeRefreshLayout
+滑动底部自动加载- 使用第三方库
SwipeToLoadLayout
实现上拉加载和下拉刷新。
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
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。