打造通用下拉刷新上拉加載更多組件
android開(kāi)發(fā)中最常用的就是列表組件，如ListView，recycleView，用到它們感覺(jué)就會(huì)涉及到數(shù)據(jù)更新，分頁(yè)加載。
最開(kāi)始的時(shí)候，刷新組件我是在技術(shù)群里頭找了一個(gè)被人綁定好的庫(kù)，是綁定的github上一個(gè)星星很多的java原生組件。但是demo很簡(jiǎn)單，對(duì)于當(dāng)時(shí)小白的我懵逼了，不曉得咋個(gè)用，而且一直覺(jué)得banding的庫(kù)總感覺(jué)有問(wèn)題，就想著直接找一個(gè)java的庫(kù)翻譯成C#版本的。功夫不負(fù)苦心人，在csdn上找到了一篇http://blog.csdn.net/zhongkejingwang/article/details/38868463
寫(xiě)的很詳細(xì)，翻譯起來(lái)也省了不少力，也很感謝原作者。
突然想起一句話(huà)，叫做我們不生產(chǎn)代碼，只是代碼的搬運(yùn)工！
這里貼上我翻譯好的其中幾個(gè)很重要的組件的代碼:
1.PullToRefreshLayout
using System;using System.Threading.Tasks;using Android.Content;using Android.OS;using Android.Util;using Android.Views;using Android.Views.Animations;using Android.Widget;using CNBlog.Droid.Utils;namespace CNBlog.Droid.PullableView
{ public class PullToRefreshLayout : RelativeLayout
{ // 初始狀態(tài)
private const int initStatus = 0; // 釋放刷新
private const int releaseToRefresh = 1; // 正在刷新
private const int refreshing = 2; // 釋放加載
private const int releaseToLoad = 3; // 正在加載
private const int loading = 4; // 操作完畢
private const int complete = 5; // 當(dāng)前狀態(tài)
private int currentStatus = 0; // 刷新回調(diào)接口
private OnRefreshListener mListener; // 刷新成功
private const int succeed = 0; // 刷新失敗
private const int failed = 1; // 按下Y坐標(biāo)，上一個(gè)事件點(diǎn)Y坐標(biāo)
private float downY, lastY; // 下拉的距離。注意：pullDownY和pullUpY不可能同時(shí)不為0
private float pullDownY = 0; // 上拉的距離
private float pullUpY = 0; // 釋放刷新的距離
private float refreshDist = 200; // 釋放加載的距離
private float loadmoreDist = 200; private UIScheduling uScheduling; // 回滾速度
private float moveSpeed = 8; // 第一次執(zhí)行布局
private bool isLayout = false; // 在刷新過(guò)程中滑動(dòng)操作
private bool isTouch = false; // 手指滑動(dòng)距離與下拉頭的滑動(dòng)距離比，中間會(huì)隨正切函數(shù)變化
private float radio = 2; // 下拉箭頭的轉(zhuǎn)180°動(dòng)畫(huà)
private RotateAnimation rotateAnimation; // 均勻旋轉(zhuǎn)動(dòng)畫(huà)
private RotateAnimation refreshingAnimation; // 下拉頭
private View refreshView; // 下拉的箭頭
public View pullView; // 正在刷新的圖標(biāo)
private View refreshingView; // 刷新結(jié)果圖標(biāo)
private View refreshStateImageView; // 刷新結(jié)果：成功或失敗
private TextView refreshStateTextView; // 上拉頭
private View loadmoreView; // 上拉的箭頭
public View pullUpView; // 正在加載的圖標(biāo)
private View loadingView; // 加載結(jié)果圖標(biāo)
private View loadStateImageView; // 加載結(jié)果：成功或失敗
private TextView loadStateTextView; //請(qǐng)求加載錯(cuò)誤View
private View errorView; // 實(shí)現(xiàn)了Pullable接口的View
private View pullableView; // 過(guò)濾多點(diǎn)觸碰
private int mEvents; // 這兩個(gè)變量用來(lái)控制pull的方向，如果不加控制，當(dāng)情況滿(mǎn)足可上拉又可下拉時(shí)沒(méi)法下拉
private bool canPullDown = true; private bool canPullUp = true; private Context mContext; private Handler updateUIHandler; public void setOnRefreshListener(OnRefreshListener listener)
{
mListener = listener;
} public PullToRefreshLayout(Context context)
: base(context)
{
initView(context);
} public PullToRefreshLayout(Context context, IAttributeSet attrs)
: base(context, attrs)
{
initView(context);
} public PullToRefreshLayout(Context context, IAttributeSet attrs, int defStyle)
: base(context, attrs, defStyle)
{
initView(context);
} private void initView(Context context)
{
mContext = context;
updateUIHandler = new Handler((Message msg) =>
{ // 回彈速度隨下拉距離moveDeltaY增大而增大
moveSpeed = (float)(8 + 5 * Math.Tan(Math.PI / 2 / MeasuredHeight * (pullDownY + Math.Abs(pullUpY)))); if (!isTouch)
{ // 正在刷新，且沒(méi)有往上推的話(huà)則懸停，顯示"正在刷新..."
if (currentStatus == refreshing && pullDownY <= refreshDist)
{
pullDownY = refreshDist;
uScheduling.Cancel();
} else if (currentStatus == loading && -pullUpY <= loadmoreDist)
{
pullUpY = -loadmoreDist;
uScheduling.Cancel();
}
} if (pullDownY > 0)
pullDownY -= moveSpeed; else if (pullUpY < 0)
pullUpY += moveSpeed; if (pullDownY < 0)
{ // 已完成回彈
pullDownY = 0;
pullView.ClearAnimation(); // 隱藏下拉頭時(shí)有可能還在刷新，只有當(dāng)前狀態(tài)不是正在刷新時(shí)才改變狀態(tài)
if (currentStatus != refreshing && currentStatus != loading)
changeStatus(initStatus);
uScheduling.Cancel();
RequestLayout();
} if (pullUpY > 0)
{ // 已完成回彈
pullUpY = 0;
pullUpView.ClearAnimation(); // 隱藏上拉頭時(shí)有可能還在刷新，只有當(dāng)前狀態(tài)不是正在刷新時(shí)才改變狀態(tài)
if (currentStatus != refreshing && currentStatus != loading)
changeStatus(initStatus);
uScheduling.Cancel();
RequestLayout();
} // 刷新布局,會(huì)自動(dòng)調(diào)用onLayout RequestLayout(); // 沒(méi)有拖拉或者回彈完成
if (pullDownY + Math.Abs(pullUpY) == 0)
{
uScheduling.Cancel();
}
});
uScheduling = new UIScheduling(updateUIHandler);
rotateAnimation = (RotateAnimation)AnimationUtils.LoadAnimation(
context, Resource.Animator.reverse_anim);
refreshingAnimation = (RotateAnimation)AnimationUtils.LoadAnimation(
context, Resource.Animator.rotating); // 添加勻速轉(zhuǎn)動(dòng)動(dòng)畫(huà)
LinearInterpolator lir = new LinearInterpolator();
rotateAnimation.Interpolator = lir;
refreshingAnimation.Interpolator = lir;
} private void initView()
{ // 初始化下拉布局
pullView = refreshView.FindViewById<View>(Resource.Id.pull_icon);
refreshStateTextView = refreshView.FindViewById<TextView>(Resource.Id.state_tv);
refreshingView = refreshView.FindViewById<View>(Resource.Id.refreshing_icon);
refreshStateImageView = refreshView.FindViewById<View>(Resource.Id.state_iv); // 初始化上拉布局
pullUpView = loadmoreView.FindViewById<View>(Resource.Id.pullup_icon);
loadStateTextView = loadmoreView.FindViewById<TextView>(Resource.Id.loadstate_tv);
loadingView = loadmoreView.FindViewById<View>(Resource.Id.loading_icon);
loadStateImageView = loadmoreView.FindViewById<View>(Resource.Id.loadstate_iv);
} /// <summary>
/// 完成刷新操作，顯示刷新結(jié)果。注意：刷新完成后一定要調(diào)用這個(gè)方法 /// </summary>
/// <param name="refreshResult">succeed代表成功, failed代表失敗</param>
public void refreshFinish(int refreshResult)
{
refreshingView.ClearAnimation();
refreshingView.Visibility = ViewStates.Gone; switch (refreshResult)
{ case 0: // 刷新成功
refreshStateImageView.Visibility = ViewStates.Visible;
refreshStateTextView.Text = "刷新成功";
refreshStateImageView.SetBackgroundResource(Resource.Mipmap.refresh_succeed); break; case 1: default: // 刷新失敗
refreshStateImageView.Visibility = ViewStates.Visible;
refreshStateTextView.Text = "刷新失敗";
refreshStateImageView.SetBackgroundResource(Resource.Mipmap.refresh_failed); break;
} if (pullDownY > 0)
{ // 刷新結(jié)果停留1秒
new Handler((Message msg) =>
{
changeStatus(complete);
hide();
}).SendEmptyMessageDelayed(0, 1000);
} else
{
changeStatus(complete);
hide();
}
} /// <summary>
/// 加載完畢，顯示加載結(jié)果。注意：刷新完成后一定要調(diào)用這個(gè)方法 /// </summary>
/// <param name="refreshResult">succeed代表成功, failed代表失敗</param>
public void loadmoreFinish(int refreshResult)
{
loadingView.ClearAnimation();
loadingView.Visibility = ViewStates.Gone; switch (refreshResult)
{ case 0: // 加載成功
loadStateImageView.Visibility = ViewStates.Visible;
loadStateTextView.Text = "加載成功";
loadStateImageView.SetBackgroundResource(Resource.Mipmap.load_succeed); break; case 1: default: // 加載失敗
loadStateImageView.Visibility = ViewStates.Visible;
loadStateTextView.Text = "加載失敗";
loadStateImageView.SetBackgroundResource(Resource.Mipmap.load_failed);
pullableView.Visibility = ViewStates.Gone; break;
} if (pullUpY < 0)
{ // 刷新結(jié)果停留1秒
new Handler((Message msg) =>
{
changeStatus(complete);
hide();
}).SendEmptyMessageDelayed(0, 1000);
} else
{
changeStatus(complete);
hide();
}
} /// <summary>
break;延伸閱讀
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