在线移动学习系统Android客户端.zip

/******************************************************************************* * Copyright 2011, 2012 Chris Banes. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ package com.handmark.pulltorefresh.library; import android.content.Context; import android.content.res.TypedArray; import android.graphics.drawable.Drawable; import android.os.Build.VERSION; import android.os.Build.VERSION_CODES; import android.os.Bundle; import android.os.Parcelable; import android.util.AttributeSet; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.animation.DecelerateInterpolator; import android.view.animation.Interpolator; import android.widget.FrameLayout; import android.widget.LinearLayout; import com.handmark.pulltorefresh.library.internal.FlipLoadingLayout; import com.handmark.pulltorefresh.library.internal.LoadingLayout; import com.handmark.pulltorefresh.library.internal.RotateLoadingLayout; import com.handmark.pulltorefresh.library.internal.Utils; import com.handmark.pulltorefresh.library.internal.ViewCompat; public abstract class PullToRefreshBase<T extends View> extends LinearLayout implements IPullToRefresh<T> { // =========================================================== // Constants // =========================================================== static final boolean DEBUG = true; static final boolean USE_HW_LAYERS = false; static final String LOG_TAG = "PullToRefresh"; static final float FRICTION = 2.0f; public static final int SMOOTH_SCROLL_DURATION_MS = 200; public static final int SMOOTH_SCROLL_LONG_DURATION_MS = 325; static final int DEMO_SCROLL_INTERVAL = 225; static final String STATE_STATE = "ptr_state"; static final String STATE_MODE = "ptr_mode"; static final String STATE_CURRENT_MODE = "ptr_current_mode"; static final String STATE_SCROLLING_REFRESHING_ENABLED = "ptr_disable_scrolling"; static final String STATE_SHOW_REFRESHING_VIEW = "ptr_show_refreshing_view"; static final String STATE_SUPER = "ptr_super"; // =========================================================== // Fields // =========================================================== private int mTouchSlop; private float mLastMotionX, mLastMotionY; private float mInitialMotionX, mInitialMotionY; private boolean mIsBeingDragged = false; private State mState = State.RESET; private Mode mMode = Mode.getDefault(); private Mode mCurrentMode; T mRefreshableView; private FrameLayout mRefreshableViewWrapper; private boolean mShowViewWhileRefreshing = true; private boolean mScrollingWhileRefreshingEnabled = false; private boolean mFilterTouchEvents = true; private boolean mOverScrollEnabled = true; private boolean mLayoutVisibilityChangesEnabled = true; private Interpolator mScrollAnimationInterpolator; private AnimationStyle mLoadingAnimationStyle = AnimationStyle.getDefault(); private LoadingLayout mHeaderLayout; private LoadingLayout mFooterLayout; private OnRefreshListener<T> mOnRefreshListener; private OnRefreshListener2<T> mOnRefreshListener2; private OnPullEventListener<T> mOnPullEventListener; private SmoothScrollRunnable mCurrentSmoothScrollRunnable; // =========================================================== // Constructors // =========================================================== public PullToRefreshBase(Context context) { super(context); init(context, null); } public PullToRefreshBase(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } public PullToRefreshBase(Context context, Mode mode) { super(context); mMode = mode; init(context, null); } public PullToRefreshBase(Context context, Mode mode, AnimationStyle animStyle) { super(context); mMode = mode; mLoadingAnimationStyle = animStyle; init(context, null); } @Override public void addView(View child, int index, ViewGroup.LayoutParams params) { if (DEBUG) { Log.d(LOG_TAG, "addView: " + child.getClass().getSimpleName()); } final T refreshableView = getRefreshableView(); if (refreshableView instanceof ViewGroup) { ((ViewGroup) refreshableView).addView(child, index, params); } else { throw new UnsupportedOperationException("Refreshable View is not a ViewGroup so can't addView"); } } @Override public final boolean demo() { if (mMode.showHeaderLoadingLayout() && isReadyForPullStart()) { smoothScrollToAndBack(-getHeaderSize() * 2); return true; } else if (mMode.showFooterLoadingLayout() && isReadyForPullEnd()) { smoothScrollToAndBack(getFooterSize() * 2); return true; } return false; } @Override public final Mode getCurrentMode() { return mCurrentMode; } @Override public final boolean getFilterTouchEvents() { return mFilterTouchEvents; } @Override public final ILoadingLayout getLoadingLayoutProxy() { return getLoadingLayoutProxy(true, true); } @Override public final ILoadingLayout getLoadingLayoutProxy(boolean includeStart, boolean includeEnd) { return createLoadingLayoutProxy(includeStart, includeEnd); } @Override public final Mode getMode() { return mMode; } @Override public final T getRefreshableView() { return mRefreshableView; } @Override public final boolean getShowViewWhileRefreshing() { return mShowViewWhileRefreshing; } @Override public final State getState() { return mState; } /** * @deprecated See {@link #isScrollingWhileRefreshingEnabled()}. */ public final boolean isDisableScrollingWhileRefreshing() { return !isScrollingWhileRefreshingEnabled(); } @Override public final boolean isPullToRefreshEnabled() { return mMode.permitsPullToRefresh(); } @Override public final boolean isPullToRefreshOverScrollEnabled() { return VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD && mOverScrollEnabled && OverscrollHelper.isAndroidOverScrollEnabled(mRefreshableView); } @Override public final boolean isRefreshing() { return mState == State.REFRESHING || mState == State.MANUAL_REFRESHING; } @Override public final boolean isScrollingWhileRefreshingEnabled() { return mScrollingWhileRefreshingEnabled; } @Override public final boolean onInterceptTouchEvent(MotionEvent event) { if (!isPullToRefreshEnabled()) { return false; } final int action = event.getAction(); if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { mIsBeingDragged = false; return false; } if (action != MotionEvent.ACTION_DOWN && mIsBeingDragged) { return true; } switch (action) { case MotionEvent.ACTION_MOVE: { // If we're refreshing, and the flag is set. Eat all MOVE events if (!mScrollingWhileRefreshingEnabled && isRefreshing()) { return true; } if (isReadyForPull()) { final float y = event.getY(), x = event.getX(); final float diff, oppositeDiff, absDiff; // We need to use the correct values, based on scroll // direction switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: diff = x - mLastMotionX; oppositeDiff = y - mLastMotionY; break; case VERTICAL: default: diff = y - mLastMotionY; oppositeDiff = x - mLastMotionX; break; } absDiff = Math.abs(diff); if (absDiff > mTouchSlop && (!mFilterTouchEv