轉載請聲明出處http://blog.csdn.net/zhongkejingwang/article/details/38868463
源碼地址:https://github.com/jingchenUSTC/PullToRefreshAndLoad)
依照慣例,下面將會是一大波效果圖:
demo首頁也是可下拉的ListView,在底下可以加入table:
ListView:
GridView:
ExpandableListView:
ScrollView:
WebView:
ImageView:
TextView:
很不錯吧?最後的ImageView和TextView是最簡單的,直接在下面的接口方法裏返回true。
增加上拉加載很簡單,和管理下拉頭一樣,再多管理一個上拉頭,也不費事;至於把它改成通用的就需要統一一下View的行爲了,爲此,我定義了這樣一個接口,通過繼承這個接口,可以爲大步個:
- package com.jingchen.pulltorefresh.pullableview;
- public interface Pullable
- {
- /**
- * 判斷是否可以下拉,如果不需要下拉功能可以直接return false
- *
- * @return true如果可以下拉否則返回false
- */
- boolean canPullDown();
- /**
- * 判斷是否可以上拉,如果不需要上拉功能可以直接return false
- *
- * @return true如果可以上拉否則返回false
- */
- boolean canPullUp();
- }
1、增加了上拉頭,相應的也增加了控制變量。
2、拉動時消除content_view事件防止誤觸發不再使用反射,直接設置 event.setAction(MotionEvent.ACTION_CANCEL)。
3、消除了拉動過程中的多點觸碰導致的劇變。
4、不再設置content_view的onTouListener,讓使用者可以更加自由的設置監聽器。
這個PullToRefreshLayout只負責管理三個控件,如果一個View需要有上拉下拉功能則只需實現接口就行了。下面看PullToRefreshLayout的代碼,註釋寫了好多:
- package com.jingchen.pulltorefresh;
- import java.util.Timer;
- import java.util.TimerTask;
- import android.content.Context;
- import android.graphics.Canvas;
- import android.graphics.LinearGradient;
- import android.graphics.Paint;
- import android.graphics.Paint.Style;
- import android.graphics.RectF;
- import android.graphics.Shader.TileMode;
- import android.os.Handler;
- import android.os.Message;
- import android.util.AttributeSet;
- import android.util.Log;
- import android.view.MotionEvent;
- import android.view.View;
- import android.view.ViewGroup;
- import android.view.animation.AnimationUtils;
- import android.view.animation.LinearInterpolator;
- import android.view.animation.RotateAnimation;
- import android.widget.RelativeLayout;
- import android.widget.TextView;
- import com.jingchen.pulltorefresh.pullableview.Pullable;
- /**
- * 自定義的佈局,用來管理三個子控件,其中一個是下拉頭,一個是包含內容的pullableView(可以是實現Pullable接口的的任何View),
- * 還有一個上拉頭
- *
- * @author 陳靖
- */
- public class PullToRefreshLayout extends RelativeLayout
- {
- public static final String TAG = "PullToRefreshLayout";
- // 初始狀態
- public static final int INIT = 0;
- // 釋放刷新
- public static final int RELEASE_TO_REFRESH = 1;
- // 正在刷新
- public static final int REFRESHING = 2;
- // 釋放加載
- public static final int RELEASE_TO_LOAD = 3;
- // 正在加載
- public static final int LOADING = 4;
- // 操作完畢
- public static final int DONE = 5;
- // 當前狀態
- private int state = INIT;
- // 刷新回調接口
- private OnRefreshListener mListener;
- // 刷新成功
- public static final int SUCCEED = 0;
- // 刷新失敗
- public static final int FAIL = 1;
- // 按下Y座標,上一個事件點Y座標
- private float downY, lastY;
- // 下拉的距離。注意:pullDownY和pullUpY不可能同時不爲0
- public 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 MyTimer timer;
- // 回滾速度
- public float MOVE_SPEED = 8;
- // 第一次執行佈局
- private boolean isLayout = false;
- // 在刷新過程中滑動操作
- private boolean isTouch = false;
- // 手指滑動距離與下拉頭的滑動距離比,中間會隨正切函數變化
- private float radio = 2;
- // 下拉箭頭的轉180°動畫
- private RotateAnimation rotateAnimation;
- // 均勻旋轉動畫
- private RotateAnimation refreshingAnimation;
- // 下拉頭
- private View refreshView;
- // 下拉的箭頭
- private View pullView;
- // 正在刷新的圖標
- private View refreshingView;
- // 刷新結果圖標
- private View refreshStateImageView;
- // 刷新結果:成功或失敗
- private TextView refreshStateTextView;
- // 上拉頭
- private View loadmoreView;
- // 上拉的箭頭
- private View pullUpView;
- // 正在加載的圖標
- private View loadingView;
- // 加載結果圖標
- private View loadStateImageView;
- // 加載結果:成功或失敗
- private TextView loadStateTextView;
- // 實現了Pullable接口的View
- private View pullableView;
- // 過濾多點觸碰
- private int mEvents;
- // 這兩個變量用來控制pull的方向,如果不加控制,當情況滿足可上拉又可下拉時沒法下拉
- private boolean canPullDown = true;
- private boolean canPullUp = true;
- /**
- * 執行自動回滾的handler
- */
- Handler updateHandler = new Handler()
- {
- @Override
- public void handleMessage(Message msg)
- {
- // 回彈速度隨下拉距離moveDeltaY增大而增大
- MOVE_SPEED = (float) (8 + 5 * Math.tan(Math.PI / 2
- / getMeasuredHeight() * (pullDownY + Math.abs(pullUpY))));
- if (!isTouch)
- {
- // 正在刷新,且沒有往上推的話則懸停,顯示"正在刷新..."
- if (state == REFRESHING && pullDownY <= refreshDist)
- {
- pullDownY = refreshDist;
- timer.cancel();
- } else if (state == LOADING && -pullUpY <= loadmoreDist)
- {
- pullUpY = -loadmoreDist;
- timer.cancel();
- }
- }
- if (pullDownY > 0)
- pullDownY -= MOVE_SPEED;
- else if (pullUpY < 0)
- pullUpY += MOVE_SPEED;
- if (pullDownY < 0)
- {
- // 已完成回彈
- pullDownY = 0;
- pullView.clearAnimation();
- // 隱藏下拉頭時有可能還在刷新,只有當前狀態不是正在刷新時才改變狀態
- if (state != REFRESHING && state != LOADING)
- changeState(INIT);
- timer.cancel();
- }
- if (pullUpY > 0)
- {
- // 已完成回彈
- pullUpY = 0;
- pullUpView.clearAnimation();
- // 隱藏下拉頭時有可能還在刷新,只有當前狀態不是正在刷新時才改變狀態
- if (state != REFRESHING && state != LOADING)
- changeState(INIT);
- timer.cancel();
- }
- // 刷新佈局,會自動調用onLayout
- requestLayout();
- }
- };
- public void setOnRefreshListener(OnRefreshListener listener)
- {
- mListener = listener;
- }
- public PullToRefreshLayout(Context context)
- {
- super(context);
- initView(context);
- }
- public PullToRefreshLayout(Context context, AttributeSet attrs)
- {
- super(context, attrs);
- initView(context);
- }
- public PullToRefreshLayout(Context context, AttributeSet attrs, int defStyle)
- {
- super(context, attrs, defStyle);
- initView(context);
- }
- private void initView(Context context)
- {
- timer = new MyTimer(updateHandler);
- rotateAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
- context, R.anim.reverse_anim);
- refreshingAnimation = (RotateAnimation) AnimationUtils.loadAnimation(
- context, R.anim.rotating);
- // 添加勻速轉動動畫
- LinearInterpolator lir = new LinearInterpolator();
- rotateAnimation.setInterpolator(lir);
- refreshingAnimation.setInterpolator(lir);
- }
- private void hide()
- {
- timer.schedule(5);
- }
- /**
- * 完成刷新操作,顯示刷新結果。注意:刷新完成後一定要調用這個方法
- */
- /**
- * @param refreshResult
- * PullToRefreshLayout.SUCCEED代表成功,PullToRefreshLayout.FAIL代表失敗
- */
- public void refreshFinish(int refreshResult)
- {
- refreshingView.clearAnimation();
- refreshingView.setVisibility(View.GONE);
- switch (refreshResult)
- {
- case SUCCEED:
- // 刷新成功
- refreshStateImageView.setVisibility(View.VISIBLE);
- refreshStateTextView.setText(R.string.refresh_succeed);
- refreshStateImageView
- .setBackgroundResource(R.drawable.refresh_succeed);
- break;
- case FAIL:
- default:
- // 刷新失敗
- refreshStateImageView.setVisibility(View.VISIBLE);
- refreshStateTextView.setText(R.string.refresh_fail);
- refreshStateImageView
- .setBackgroundResource(R.drawable.refresh_failed);
- break;
- }
- // 刷新結果停留1秒
- new Handler()
- {
- @Override
- public void handleMessage(Message msg)
- {
- changeState(DONE);
- hide();
- }
- }.sendEmptyMessageDelayed(0, 1000);
- }
- /**
- * 加載完畢,顯示加載結果。注意:加載完成後一定要調用這個方法
- *
- * @param refreshResult
- * PullToRefreshLayout.SUCCEED代表成功,PullToRefreshLayout.FAIL代表失敗
- */
- public void loadmoreFinish(int refreshResult)
- {
- loadingView.clearAnimation();
- loadingView.setVisibility(View.GONE);
- switch (refreshResult)
- {
- case SUCCEED:
- // 加載成功
- loadStateImageView.setVisibility(View.VISIBLE);
- loadStateTextView.setText(R.string.load_succeed);
- loadStateImageView.setBackgroundResource(R.drawable.load_succeed);
- break;
- case FAIL:
- default:
- // 加載失敗
- loadStateImageView.setVisibility(View.VISIBLE);
- loadStateTextView.setText(R.string.load_fail);
- loadStateImageView.setBackgroundResource(R.drawable.load_failed);
- break;
- }
- // 刷新結果停留1秒
- new Handler()
- {
- @Override
- public void handleMessage(Message msg)
- {
- changeState(DONE);
- hide();
- }
- }.sendEmptyMessageDelayed(0, 1000);
- }
- private void changeState(int to)
- {
- state = to;
- switch (state)
- {
- case INIT:
- // 下拉布局初始狀態
- refreshStateImageView.setVisibility(View.GONE);
- refreshStateTextView.setText(R.string.pull_to_refresh);
- pullView.clearAnimation();
- pullView.setVisibility(View.VISIBLE);
- // 上拉布局初始狀態
- loadStateImageView.setVisibility(View.GONE);
- loadStateTextView.setText(R.string.pullup_to_load);
- pullUpView.clearAnimation();
- pullUpView.setVisibility(View.VISIBLE);
- break;
- case RELEASE_TO_REFRESH:
- // 釋放刷新狀態
- refreshStateTextView.setText(R.string.release_to_refresh);
- pullView.startAnimation(rotateAnimation);
- break;
- case REFRESHING:
- // 正在刷新狀態
- pullView.clearAnimation();
- refreshingView.setVisibility(View.VISIBLE);
- pullView.setVisibility(View.INVISIBLE);
- refreshingView.startAnimation(refreshingAnimation);
- refreshStateTextView.setText(R.string.refreshing);
- break;
- case RELEASE_TO_LOAD:
- // 釋放加載狀態
- loadStateTextView.setText(R.string.release_to_load);
- pullUpView.startAnimation(rotateAnimation);
- break;
- case LOADING:
- // 正在加載狀態
- pullUpView.clearAnimation();
- loadingView.setVisibility(View.VISIBLE);
- pullUpView.setVisibility(View.INVISIBLE);
- loadingView.startAnimation(refreshingAnimation);
- loadStateTextView.setText(R.string.loading);
- break;
- case DONE:
- // 刷新或加載完畢,啥都不做
- break;
- }
- }
- /**
- * 不限制上拉或下拉
- */
- private void releasePull()
- {
- canPullDown = true;
- canPullUp = true;
- }
- /*
- * (非 Javadoc)由父控件決定是否分發事件,防止事件衝突
- *
- * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)
- */
- @Override
- public boolean dispatchTouchEvent(MotionEvent ev)
- {
- switch (ev.getActionMasked())
- {
- case MotionEvent.ACTION_DOWN:
- downY = ev.getY();
- lastY = downY;
- timer.cancel();
- mEvents = 0;
- releasePull();
- break;
- case MotionEvent.ACTION_POINTER_DOWN:
- case MotionEvent.ACTION_POINTER_UP:
- // 過濾多點觸碰
- mEvents = -1;
- break;
- case MotionEvent.ACTION_MOVE:
- if (mEvents == 0)
- {
- if (((Pullable) pullableView).canPullDown() && canPullDown
- && state != LOADING)
- {
- // 可以下拉,正在加載時不能下拉
- // 對實際滑動距離做縮小,造成用力拉的感覺
- pullDownY = pullDownY + (ev.getY() - lastY) / radio;
- if (pullDownY < 0)
- {
- pullDownY = 0;
- canPullDown = false;
- canPullUp = true;
- }
- if (pullDownY > getMeasuredHeight())
- pullDownY = getMeasuredHeight();
- if (state == REFRESHING)
- {
- // 正在刷新的時候觸摸移動
- isTouch = true;
- }
- } else if (((Pullable) pullableView).canPullUp() && canPullUp
- && state != REFRESHING)
- {
- // 可以上拉,正在刷新時不能上拉
- pullUpY = pullUpY + (ev.getY() - lastY) / radio;
- if (pullUpY > 0)
- {
- pullUpY = 0;
- canPullDown = true;
- canPullUp = false;
- }
- if (pullUpY < -getMeasuredHeight())
- pullUpY = -getMeasuredHeight();
- if (state == LOADING)
- {
- // 正在加載的時候觸摸移動
- isTouch = true;
- }
- } else
- releasePull();
- } else
- mEvents = 0;
- lastY = ev.getY();
- // 根據下拉距離改變比例
- radio = (float) (2 + 2 * Math.tan(Math.PI / 2 / getMeasuredHeight()
- * (pullDownY + Math.abs(pullUpY))));
- requestLayout();
- if (pullDownY <= refreshDist
- <span style="white-space:pre"> </span>&& (state == RELEASE_TO_REFRESH || state == DONE)) {
- <span style="white-space:pre"> </span>// 如果下拉距離沒達到刷新的距離且當前狀態是釋放刷新,改變狀態爲下拉刷新
- <span style="white-space:pre"> </span>changeState(INIT);
- <span style="white-space:pre"> </span>}
- <span style="white-space:pre"> </span>if (pullDownY >= refreshDist && (state == INIT || state == DONE)) {
- <span style="white-space:pre"> </span>// 如果下拉距離達到刷新的距離且當前狀態是初始狀態刷新,改變狀態爲釋放刷新
- <span style="white-space:pre"> </span>changeState(RELEASE_TO_REFRESH);
- <span style="white-space:pre"> </span>}
- <span style="white-space:pre"> </span>// 下面是判斷上拉加載的,同上,注意pullUpY是負值
- <span style="white-space:pre"> </span>if (-pullUpY <= loadmoreDist
- <span style="white-space:pre"> </span>&& (state == RELEASE_TO_LOAD || state == DONE)) {
- <span style="white-space:pre"> </span>changeState(INIT);
- <span style="white-space:pre"> </span>}
- <span style="white-space:pre"> </span>if (-pullUpY >= loadmoreDist && (state == INIT || state == DONE)) {
- <span style="white-space:pre"> </span>changeState(RELEASE_TO_LOAD);
- <span style="white-space:pre"> </span>}
- // 因爲刷新和加載操作不能同時進行,所以pullDownY和pullUpY不會同時不爲0,因此這裏用(pullDownY +
- // Math.abs(pullUpY))就可以不對當前狀態作區分了
- if ((pullDownY + Math.abs(pullUpY)) > 8)
- {
- // 防止下拉過程中誤觸發長按事件和點擊事件
- ev.setAction(MotionEvent.ACTION_CANCEL);
- }
- break;
- case MotionEvent.ACTION_UP:
- if (pullDownY > refreshDist || -pullUpY > loadmoreDist)
- // 正在刷新時往下拉(正在加載時往上拉),釋放後下拉頭(上拉頭)不隱藏
- isTouch = false;
- if (state == RELEASE_TO_REFRESH)
- {
- changeState(REFRESHING);
- // 刷新操作
- if (mListener != null)
- mListener.onRefresh(this);
- } else if (state == RELEASE_TO_LOAD)
- {
- changeState(LOADING);
- // 加載操作
- if (mListener != null)
- mListener.onLoadMore(this);
- }
- hide();
- default:
- break;
- }
- // 事件分發交給父類
- super.dispatchTouchEvent(ev);
- return true;
- }
- private void initView()
- {
- // 初始化下拉布局
- pullView = refreshView.findViewById(R.id.pull_icon);
- refreshStateTextView = (TextView) refreshView
- .findViewById(R.id.state_tv);
- refreshingView = refreshView.findViewById(R.id.refreshing_icon);
- refreshStateImageView = refreshView.findViewById(R.id.state_iv);
- // 初始化上拉布局
- pullUpView = loadmoreView.findViewById(R.id.pullup_icon);
- loadStateTextView = (TextView) loadmoreView
- .findViewById(R.id.loadstate_tv);
- loadingView = loadmoreView.findViewById(R.id.loading_icon);
- loadStateImageView = loadmoreView.findViewById(R.id.loadstate_iv);
- }
- @Override
- protected void onLayout(boolean changed, int l, int t, int r, int b)
- {
- if (!isLayout)
- {
- // 這裏是第一次進來的時候做一些初始化
- refreshView = getChildAt(0);
- pullableView = getChildAt(1);
- loadmoreView = getChildAt(2);
- isLayout = true;
- initView();
- refreshDist = ((ViewGroup) refreshView).getChildAt(0)
- .getMeasuredHeight();
- loadmoreDist = ((ViewGroup) loadmoreView).getChildAt(0)
- .getMeasuredHeight();
- }
- // 改變子控件的佈局,這裏直接用(pullDownY + pullUpY)作爲偏移量,這樣就可以不對當前狀態作區分
- refreshView.layout(0,
- (int) (pullDownY + pullUpY) - refreshView.getMeasuredHeight(),
- refreshView.getMeasuredWidth(), (int) (pullDownY + pullUpY));
- pullableView.layout(0, (int) (pullDownY + pullUpY),
- pullableView.getMeasuredWidth(), (int) (pullDownY + pullUpY)
- + pullableView.getMeasuredHeight());
- loadmoreView.layout(0,
- (int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight(),
- loadmoreView.getMeasuredWidth(),
- (int) (pullDownY + pullUpY) + pullableView.getMeasuredHeight()
- + loadmoreView.getMeasuredHeight());
- }
- class MyTimer
- {
- private Handler handler;
- private Timer timer;
- private MyTask mTask;
- public MyTimer(Handler handler)
- {
- this.handler = handler;
- timer = new Timer();
- }
- public void schedule(long period)
- {
- if (mTask != null)
- {
- mTask.cancel();
- mTask = null;
- }
- mTask = new MyTask(handler);
- timer.schedule(mTask, 0, period);
- }
- public void cancel()
- {
- if (mTask != null)
- {
- mTask.cancel();
- mTask = null;
- }
- }
- class MyTask extends TimerTask
- {
- private Handler handler;
- public MyTask(Handler handler)
- {
- this.handler = handler;
- }
- @Override
- public void run()
- {
- handler.obtainMessage().sendToTarget();
- }
- }
- }
- /**
- * 刷新加載回調接口
- *
- * @author chenjing
- *
- */
- public interface OnRefreshListener
- {
- /**
- * 刷新操作
- */
- void onRefresh(PullToRefreshLayout pullToRefreshLayout);
- /**
- * 加載操作
- */
- void onLoadMore(PullToRefreshLayout pullToRefreshLayout);
- }
- }
下面看各個View對Pullable接口的實現,ListView和GridView還有ExpandableListView的判斷方法是一樣的:
PullableListView:
- package com.jingchen.pulltorefresh.pullableview;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.util.Log;
- import android.widget.ListView;
- public class PullableListView extends ListView implements Pullable
- {
- public PullableListView(Context context)
- {
- super(context);
- }
- public PullableListView(Context context, AttributeSet attrs)
- {
- super(context, attrs);
- }
- public PullableListView(Context context, AttributeSet attrs, int defStyle)
- {
- super(context, attrs, defStyle);
- }
- @Override
- public boolean canPullDown()
- {
- if (getCount() == 0)
- {
- // 沒有item的時候也可以下拉刷新
- return true;
- } else if (getFirstVisiblePosition() == 0
- && getChildAt(0).getTop() >= 0)
- {
- // 滑到ListView的頂部了
- return true;
- } else
- return false;
- }
- @Override
- public boolean canPullUp()
- {
- if (getCount() == 0)
- {
- // 沒有item的時候也可以上拉加載
- return true;
- } else if (getLastVisiblePosition() == (getCount() - 1))
- {
- // 滑到底部了
- if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null
- && getChildAt(
- getLastVisiblePosition()
- - getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())
- return true;
- }
- return false;
- }
- }
PullableExpandableListView:
- package com.jingchen.pulltorefresh.pullableview;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.widget.ExpandableListView;
- public class PullableExpandableListView extends ExpandableListView implements
- Pullable
- {
- public PullableExpandableListView(Context context)
- {
- super(context);
- }
- public PullableExpandableListView(Context context, AttributeSet attrs)
- {
- super(context, attrs);
- }
- public PullableExpandableListView(Context context, AttributeSet attrs,
- int defStyle)
- {
- super(context, attrs, defStyle);
- }
- @Override
- public boolean canPullDown()
- {
- if (getCount() == 0)
- {
- // 沒有item的時候也可以下拉刷新
- return true;
- } else if (getFirstVisiblePosition() == 0
- && getChildAt(0).getTop() >= 0)
- {
- // 滑到頂部了
- return true;
- } else
- return false;
- }
- @Override
- public boolean canPullUp()
- {
- if (getCount() == 0)
- {
- // 沒有item的時候也可以上拉加載
- return true;
- } else if (getLastVisiblePosition() == (getCount() - 1))
- {
- // 滑到底部了
- if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null
- && getChildAt(
- getLastVisiblePosition()
- - getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())
- return true;
- }
- return false;
- }
- }
PullableGridView:
- package com.jingchen.pulltorefresh.pullableview;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.widget.GridView;
- public class PullableGridView extends GridView implements Pullable
- {
- public PullableGridView(Context context)
- {
- super(context);
- }
- public PullableGridView(Context context, AttributeSet attrs)
- {
- super(context, attrs);
- }
- public PullableGridView(Context context, AttributeSet attrs, int defStyle)
- {
- super(context, attrs, defStyle);
- }
- @Override
- public boolean canPullDown()
- {
- if (getCount() == 0)
- {
- // 沒有item的時候也可以下拉刷新
- return true;
- } else if (getFirstVisiblePosition() == 0
- && getChildAt(0).getTop() >= 0)
- {
- // 滑到頂部了
- return true;
- } else
- return false;
- }
- @Override
- public boolean canPullUp()
- {
- if (getCount() == 0)
- {
- // 沒有item的時候也可以上拉加載
- return true;
- } else if (getLastVisiblePosition() == (getCount() - 1))
- {
- // 滑到底部了
- if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null
- && getChildAt(
- getLastVisiblePosition()
- - getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())
- return true;
- }
- return false;
- }
- }
PullableScrollView:
- package com.jingchen.pulltorefresh.pullableview;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.widget.ScrollView;
- public class PullableScrollView extends ScrollView implements Pullable
- {
- public PullableScrollView(Context context)
- {
- super(context);
- }
- public PullableScrollView(Context context, AttributeSet attrs)
- {
- super(context, attrs);
- }
- public PullableScrollView(Context context, AttributeSet attrs, int defStyle)
- {
- super(context, attrs, defStyle);
- }
- @Override
- public boolean canPullDown()
- {
- if (getScrollY() == 0)
- return true;
- else
- return false;
- }
- @Override
- public boolean canPullUp()
- {
- if (getScrollY() >= (getChildAt(0).getHeight() - getMeasuredHeight()))
- return true;
- else
- return false;
- }
- }
PullableWebView:
- package com.jingchen.pulltorefresh.pullableview;
- import android.content.Context;
- import android.util.AttributeSet;
- import android.webkit.WebView;
- public class PullableWebView extends WebView implements Pullable
- {
- public PullableWebView(Context context)
- {
- super(context);
- }
- public PullableWebView(Context context, AttributeSet attrs)
- {
- super(context, attrs);
- }
- public PullableWebView(Context context, AttributeSet attrs, int defStyle)
- {
- super(context, attrs, defStyle);
- }
- @Override
- public boolean canPullDown()
- {
- if (getScrollY() == 0)
- return true;
- else
- return false;
- }
- @Override
- public boolean canPullUp()
- {
- if (getScrollY() >= getContentHeight() * getScale()
- - getMeasuredHeight())
- return true;
- else
- return false;
- }
- }
ImageView和TextView就不貼了,我直接在方法裏返回了true。