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Android RecyclerView實(shí)現(xiàn)下拉刷新和上拉加載

 更新時(shí)間：2021年09月09日 14:33:15   作者：Alex_MaHao  
這篇文章主要介紹了Android RecyclerView實(shí)現(xiàn)下拉刷新和上拉加載的相關(guān)資料，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

RecyclerView已經(jīng)出來(lái)很久了，許許多多的項(xiàng)目都開(kāi)始從ListView轉(zhuǎn)戰(zhàn)RecyclerView，那么，上拉加載和下拉刷新是一件很有必要的事情。

在ListView上，我們可以通過(guò)自己添加addHeadView和addFootView去添加頭布局和底部局實(shí)現(xiàn)自定義的上拉和下拉，或者使用一些第三方庫(kù)來(lái)簡(jiǎn)單的集成，例如Android-pulltorefresh或者android-Ultra-Pull-to-Refresh，后者的自定義更強(qiáng)，但需要自己實(shí)現(xiàn)上拉加載。

而在下面我們將用兩種方式來(lái)實(shí)現(xiàn)上拉加載和下拉刷新

第一種方式：SwipeRefreshLayout+滑動(dòng)底部自動(dòng)加載

第二種方式：使用第三方庫(kù)SwipeToLoadLayout實(shí)現(xiàn)上拉加載和下拉刷新。

第一種方式：SwipeRefreshLayout+滑動(dòng)底部自動(dòng)加載

SwipeRefreshLayout實(shí)現(xiàn)很簡(jiǎn)單，重點(diǎn)是滑動(dòng)到底部自動(dòng)加載應(yīng)該如何實(shí)現(xiàn)，其實(shí)其實(shí)現(xiàn)的方式類(lèi)似于ListView的實(shí)現(xiàn)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>

布局文件就兩個(gè)控件，SwipeRefreshLayout中嵌套R(shí)ecyclerView。

在代碼中初始化RecyclerView以及實(shí)現(xiàn)adapter等，這不是重點(diǎn)，不再貼代碼。

在RecyclerView中有方法addOnScrollListener，該方法類(lèi)似于ListView的setOnScrollListener方法，OnScrollListener中有兩個(gè)方法的回調(diào)

*onScrolled(RecyclerView recyclerView, int dx, int dy) ：滾動(dòng)的回調(diào)，dx和dy表示手指滑動(dòng)水平和垂直的偏移量。

*onScrollStateChanged(RecyclerView recyclerView, int newState)：滑動(dòng)狀態(tài)的回調(diào)。

那么，我們的著重點(diǎn)就在這個(gè)兩個(gè)方法上了。

對(duì)于向上加載更多，我們需要有如下判斷

--是否是向上滑動(dòng)

--是否滑動(dòng)到底部

--當(dāng)前是否正在加載數(shù)據(jù)

--當(dāng)前狀態(tài)是否是滑動(dòng)停止的狀態(tài)

實(shí)現(xiàn)比較復(fù)雜，定義一個(gè)類(lèi)LoadDataScrollController，繼承類(lèi)RecyclerView.OnScrollListener，

因?yàn)閛nScrollStateChanged實(shí)在狀態(tài)改變時(shí)的回調(diào)，無(wú)法時(shí)時(shí)的獲取顯示的條目以及位置，所以我們?cè)趏nScrolled中獲取相應(yīng)位置，

 @Override
 public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

  /**
   * 獲取布局參數(shù)
   */
  RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

  //如果為null，第一次運(yùn)行，確定布局類(lèi)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");
   }
  }

  //對(duì)于不太能夠的布局參數(shù)，不同的方法獲取到當(dāng)前顯示的最后一個(gè)條目數(shù)
  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;
  }

 }

首先獲取布局管理器，并判斷是那種類(lèi)型的，因?yàn)橛腥N類(lèi)型，定義枚舉來(lái)保存布局類(lèi)型的參數(shù)

/**
 *
 * RecycleView的布局管理器的類(lèi)型
 * Created by Alex_MaHao on 2016/5/10.
 */
public enum LayoutManagerType {
 LINEAR_LAYOUT,
 GRID_LAYOUT,
 STAGGERED_GRID_LAYOUT
}

然后根據(jù)布局慣例其的類(lèi)型獲取其當(dāng)前顯示的最大條目，對(duì)于瀑布流來(lái)說(shuō)，他如果是垂直的兩列瀑布的話(huà)，我們需要獲取兩列中分別最大條目數(shù)，進(jìn)行比較，選出最大條目數(shù)。

 /**
  * 當(dāng)是瀑布流時(shí)，獲取到的是每一個(gè)瀑布最下方顯示的條目，通過(guò)條目進(jìn)行對(duì)比
  */
 private int findMax(int[] lastPositions) {
  int max = lastPositions[0];
  for (int value : lastPositions) {
   if (value > max) {
    max = value;
   }
  }
  return max;
 }

拿到當(dāng)前最大的條目數(shù)之后，在onScrollStateChange中進(jìn)行判斷狀態(tài)等，

 @Override
 public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

  RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

  //RecycleView 顯示的條目數(shù)
  int visibleCount = layoutManager.getChildCount();

  //顯示數(shù)據(jù)總數(shù)
  int totalCount = layoutManager.getItemCount();


  // 四個(gè)條件，分別是是否有數(shù)據(jù)，狀態(tài)是否是滑動(dòng)停止?fàn)顟B(tài)，顯示的最大條目是否大于整個(gè)數(shù)據(jù)（注意偏移量），是否正在加載數(shù)據(jù)
  if(visibleCount>0
    &&newState==RecyclerView.SCROLL_STATE_IDLE
    &&mLastVisibleItemPosition>=totalCount-1
    &&!isLoadData){
   //可以加載數(shù)據(jù)
   isLoadData = true;
  }

 }

注釋很清楚，在加載數(shù)據(jù)的地方，我們將isLoadData設(shè)為true，同時(shí)利用接口回調(diào)加載數(shù)據(jù)，等數(shù)據(jù)加載完成，通過(guò)setLoadDataStatus方法設(shè)置為false

 public void setLoadDataStatus(boolean isLoadData){
  this.isLoadData = isLoadData;
 }

如果這樣就結(jié)束了，感覺(jué)很麻煩，對(duì)于刷新和加載更多，我們需要在調(diào)用的地方分別設(shè)置監(jiān)聽(tīng)，那么我們可以讓LoadDataScrollController實(shí)現(xiàn)SwipeRefreshLayout的刷新監(jiān)聽(tīng)方法，在利用我們定義的統(tǒng)一的上拉刷新和加載數(shù)據(jù)接口進(jìn)行處理

/**
 * 實(shí)現(xiàn)上拉加載的監(jiān)聽(tīng)：加載條件：滑動(dòng)到最后，且是停止?fàn)顟B(tài)，則開(kāi)始加載數(shù)據(jù)
 * Created by Alex_MaHao on 2016/5/10.
 */
public class LoadDataScrollController extends RecyclerView.OnScrollListener implements SwipeRefreshLayout.OnRefreshListener {

 /**
  * 當(dāng)前布局管理器的類(lèi)型
  */
 private LayoutManagerType mLayoutManagerType;


 /**
  * 當(dāng)前RecycleView顯示的最大條目
  */
 private int mLastVisibleItemPosition;


 /**
  * 每列的最后一個(gè)條目
  */
 private int[] mLastPostions;


 /**
  * 是否正在加載數(shù)據(jù) 包括刷新和向上加載更多
  */
 private boolean isLoadData = false;


 /**
  * 回調(diào)接口
  */
 private OnRecycleRefreshListener mListener;


 public LoadDataScrollController(OnRecycleRefreshListener onRecycleRefreshListener) {
  this.mListener = onRecycleRefreshListener;
 }

 @Override
 public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

  /**
   * 獲取布局參數(shù)
   */
  RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

  //如果為null，第一次運(yùn)行，確定布局類(lèi)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");
   }
  }

  //對(duì)于不太能夠的布局參數(shù)，不同的方法獲取到當(dāng)前顯示的最后一個(gè)條目數(shù)
  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 顯示的條目數(shù)
  int visibleCount = layoutManager.getChildCount();

  //顯示數(shù)據(jù)總數(shù)
  int totalCount = layoutManager.getItemCount();


  // 四個(gè)條件，分別是是否有數(shù)據(jù)，狀態(tài)是否是滑動(dòng)停止?fàn)顟B(tài)，顯示的最大條目是否大于整個(gè)數(shù)據(jù)（注意偏移量），是否正在加載數(shù)據(jù)
  if(visibleCount>0
    &&newState==RecyclerView.SCROLL_STATE_IDLE
    &&mLastVisibleItemPosition>=totalCount-1
    &&!isLoadData){
   //可以加載數(shù)據(jù)
   if(mListener!=null){
    isLoadData = true;
    mListener.loadMore();
   }
  }

 }


 /**
  * 當(dāng)是瀑布流時(shí)，獲取到的是每一個(gè)瀑布最下方顯示的條目，通過(guò)條目進(jìn)行對(duì)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() {
  //刷新數(shù)據(jù)的方法
  if(mListener!=null){
   isLoadData = true;
   mListener.refresh();
  }

 }

 /**
  * 數(shù)據(jù)加載接口回調(diào)
  */
 interface OnRecycleRefreshListener{
  void refresh();
  void loadMore();
 }
}

最后看一下main的代碼

/**
 * 使用原生的SwipeRefreshLayout和代碼判斷
 *  實(shí)現(xiàn)RecyclewView 的刷新和加載更多
 *
 * 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);

  /**
   * 創(chuàng)建控制器，同時(shí)使當(dāng)前activity實(shí)現(xiàn)數(shù)據(jù)監(jiān)聽(tīng)回調(diào)接口
   */
  mController = new LoadDataScrollController(this);



  mAdapter = new HomeAdapter();

  //設(shè)置垂直的線(xiàn)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);

  //添加分割線(xiàn)
  mRecycle.addItemDecoration(new DividerItemDecoration(getApplicationContext(), DividerItemDecoration.VERTICAL_LIST));


  mRecycle.setLayoutManager(layoutManager);

  mRecycle.setItemAnimator(new DefaultItemAnimator());

  mRecycle.setAdapter(mAdapter);

  mAdapter.refresh();

  /**
   * 設(shè)置監(jiān)聽(tīng)
   */
  mRecycle.addOnScrollListener(mController);

  mSwipeRefresh.setOnRefreshListener(mController);

 }

 @Override
 public void refresh() {
  //刷新的接口調(diào)
  mSwipeRefresh.postDelayed(new Runnable() {
   @Override
   public void run() {
    mAdapter.refresh();
    mSwipeRefresh.setRefreshing(false);
    mController.setLoadDataStatus(false);
   }
  },2000);
 }

 @Override
 public void loadMore() {
  //加載更多的接口回調(diào)
  pd = new ProgressDialog(this);
  pd.show();
  mSwipeRefresh.postDelayed(new Runnable() {
   @Override
   public void run() {
    mAdapter.add();
    //設(shè)置數(shù)據(jù)加載結(jié)束的監(jiān)聽(tīng)狀態(tài)
    mController.setLoadDataStatus(false);
    pd.dismiss();
   }
  },2000);
 }
}

貼個(gè)效果圖

第二種方式：SwipeToLoadLayout實(shí)現(xiàn)上拉加載和下拉刷新

該刷新控件的方式類(lèi)似于Ultra-pull-to-refresh的使用方式。

如下方式添加該庫(kù)：

repositories {
  maven { url "https://jitpack.io" }
   }

 compile 'com.github.Aspsine:SwipeToLoadLayout:1.0.3'

首先我們需要自定義一個(gè)頭視圖和底部視圖，頭部試圖和底部試圖的用法相同，所以我們先定義一個(gè)頭部視圖類(lèi)：

/**
 * 基礎(chǔ)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() {
  //下拉到一定位置松開(kāi)之后，調(diào)用此方法
  setText("refresh");

  Log.i("info","onRefresh");
 }

 @Override
 public void onPrepare() {

  //下拉之前調(diào)用此方法
  Log.i("info","onPrepare");
 }

 @Override
 public void onMove(int yScrolled, boolean isComplete, boolean automatic) {
  if (!isComplete) {
   //當(dāng)前Y軸偏移量大于控件高度時(shí)，標(biāo)識(shí)下拉到界限，顯示“松開(kāi)已刷新”
   if (yScrolled >= getHeight()) {

   } else {
    //未達(dá)到偏移量

   }
  } 
  Log.i("info","onMove");
 }

 @Override
 public void onRelease() {
  //達(dá)到一定滑動(dòng)距離，松開(kāi)刷新時(shí)調(diào)用
  setText("onRelease");
  Log.i("info","onRelease");
 }

 @Override
 public void onComplete() {
  //加載完成之后調(diào)用此方法
  setText("complete");
  Log.i("info","onComplete");
 }

 @Override
 public void onReset() {
  //重置
  setText("onReset");
  Log.i("info","onReset");
 }
}

其需要實(shí)現(xiàn)接口SwipeRefreshTrigger和SwipeTrigger。

而底部需要實(shí)現(xiàn)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，設(shè)置監(jiān)聽(tīng)

  swipeToLoadLayout.setOnRefreshListener(this);
     swipeToLoadLayout.setOnLoadMoreListener(this);

在我們之前的代碼中，加入了log信息，我們可以看一下log信息?！矶啻蝟nMove()方法多次調(diào)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

首先會(huì)調(diào)用onPrepare()方法，onMove()方法會(huì)一直調(diào)用,只要視圖有偏移，就會(huì)調(diào)用。下拉到一定距離之后，松開(kāi)調(diào)用onRelaease(),回歸到刷新位置時(shí)回調(diào)onRefresh()，加載完成調(diào)用onComplete()，視圖開(kāi)始縮小，最后隱藏之后調(diào)用onReset()

根據(jù)需求自定義視圖，

定義我們的橢圓,使用自定義控件

/**
 * CircleView 圓盤(pán)控件，可以旋轉(zhuǎn)
 * Created by Alex_MaHao on 2016/5/10.
 */
public class CircleView extends View {

 /**
  * 控件的半徑
  */
 private int mRadius;

 /**
  * 繪制弧形的畫(huà)筆
  */
 private Paint mArcPaint;

 /**
  * 繪制弧形的區(qū)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());
  }

  //獲取半徑
  mRadius = Math.min(width, height) / 2;
  /**
   * 設(shè)置寬高為固定值
   */
  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);
  }

 }
}

繪制頭部刷新試圖

**
 * 自定義的下拉刷新控件 頭部
 * 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");

  //添加線(xiàn)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() {

  //開(kāi)始刷新，啟動(dòng)動(dòng)畫(huà)
  anim = ObjectAnimator.ofFloat(mCircleView, "rotation", mCircleView.getRotation(), mCircleView.getRotation()+360f)
    .setDuration(500);
  anim.setRepeatCount(ValueAnimator.INFINITE);
  anim.setRepeatMode(ValueAnimator.RESTART);
  anim.start();

  mDescText.setText("正在加載數(shù)據(jù)");
 }

 @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("松開(kāi)刷新更多");
   }

   //如果是仍在下拉狀態(tài)，則圓環(huán)跟隨滑動(dòng)進(jìn)行滾動(dòng)
   if (!isRelease)
    mCircleView.setRotation(((float) yScroll) / getHeight() * 360f);
  }


 }

 @Override
 public void onRelease() {
  isRelease = true;
 }

 @Override
 public void onComplete() {
  anim.cancel();
  mDescText.setText("加載完成");
 }

 @Override
 public void onReset() {
  //重置時(shí)，將動(dòng)畫(huà)置為初始狀態(tài)
  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();

  //設(shè)置垂直的線(xiàn)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);

  //添加分割線(xiàn)
  mRecycleView.addItemDecoration(new DividerItemDecoration(getApplicationContext(), DividerItemDecoration.VERTICAL_LIST));

  mRecycleView.setLayoutManager(layoutManager);

  mRecycleView.setItemAnimator(new DefaultItemAnimator());

  mRecycleView.setAdapter(adapter);

  adapter.refresh();

  /**
   * 設(shè)置下拉刷新和上拉加載監(jiān)聽(tīng)
   */
  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?？隙ㄓ行』锇槭褂迷摽蚣軙r(shí)一直報(bào)錯(cuò)，為什么，看框架的源碼，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，作者是根據(jù)固定的id值獲取的，所以在我們的布局文件中，必須使用固定的三個(gè)id。

如有需求，可移步我的github獲取源碼，源碼在systemwidgetdemo中。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家學(xué)習(xí)Android軟件編程有所幫助。

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