至此，2种拦截方法已经学习完毕，下面我们来学习如何解决同向滑动冲突。其实和上面的2个例子思路是一样的，只是用来判断是否拦截的那块逻辑不同而已。
下面的例子，是一个下拉刷新的一个控件。
3、外部拦截 解决同向滑动冲突RefreshLayoutBase.java
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 <code class = "hljs cs" > package com.blueberry.sample.widget.refresh; import android.content.Context; import android.graphics.Color; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.util.TypedValue; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.ProgressBar; import android.widget.Scroller; import android.widget.TextView; import com.blueberry.sample.R; /** * Created by blueberry on 2016/6/21. * *外部拦截(同向) * */ public abstract class RefreshLayoutBase<t extends = "" view= "" > extends ViewGroup { private static final String TAG = "RefreshLayoutBase" ; public static final int STATUS_LOADING = 1 ; public static final int STATUS_RELEASE_TO_REFRESH = 2 ; public static final int STATUS_PULL_TO_REFRESH = 3 ; public static final int STATUS_IDLE = 4 ; public static final int STATUS_LOAD_MORE = 5 ; private static int SCROLL_DURATION = 500 ; protected ViewGroup mHeadView; protected ViewGroup mFootView; private T contentView; private ProgressBar headProgressBar; private TextView headTv; private ProgressBar footProgressBar; private TextView footTv; private boolean isFistTouch = true ; protected int currentStatus = STATUS_IDLE; private int mScreenWidth; private int mScreenHeight; private int mLastXIntercepted; private int mLastYIntercepted; private int mLastX; private int mLastY; protected int mInitScrollY = 0 ; private int mTouchSlop; protected Scroller mScoller; private OnRefreshListener mOnRefreshListener; public RefreshLayoutBase(Context context) { this (context, null ); } public RefreshLayoutBase(Context context, AttributeSet attrs) { this (context, attrs, 0 ); } public RefreshLayoutBase(Context context, AttributeSet attrs, int defStyleAttr) { super (context, attrs, defStyleAttr); getScreenSize(); initView(); mScoller = new Scroller(context); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); setPadding( 0 , 0 , 0 , 0 ); } public void setContentView(T view) { addView(view, 1 ); } public OnRefreshListener getOnRefreshListener() { return mOnRefreshListener; } public void setOnRefreshListener(OnRefreshListener mOnRefreshListener) { this .mOnRefreshListener = mOnRefreshListener; } private void initView() { setupHeadView(); setupFootView(); } private void getScreenSize() { WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE); DisplayMetrics metrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(metrics); mScreenWidth = metrics.widthPixels; mScreenHeight = metrics.heightPixels; } private int dp2px( int dp) { WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE); DisplayMetrics metrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(metrics); return ( int ) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, metrics); } /** * 设置头布局 */ private void setupHeadView() { mHeadView = (ViewGroup) View.inflate(getContext(), R.layout.fresh_head_view, null ); mHeadView.setBackgroundColor(Color.RED); headProgressBar = (ProgressBar) mHeadView.findViewById(R.id.head_progressbar); headTv = (TextView) mHeadView.findViewById(R.id.head_tv); /*设置 实际高度为 1/4 ，但内容区域只有 100dp*/ ViewGroup.LayoutParams layoutParams = new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT, mScreenHeight / 4 ); mHeadView.setLayoutParams(layoutParams); mHeadView.setPadding( 0 , mScreenHeight / 4 - dp2px( 100 ), 0 , 0 ); addView(mHeadView); } /** * 设置尾布局 */ private void setupFootView() { mFootView = (ViewGroup) View.inflate(getContext(), R.layout.fresh_foot_view, null ); mFootView.setBackgroundColor(Color.BLUE); footProgressBar = (ProgressBar) mFootView.findViewById(R.id.fresh_foot_progressbar); footTv = (TextView) mFootView.findViewById(R.id.fresh_foot_tv); addView(mFootView); } @Override protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec) { int widthSize = MeasureSpec.getSize(widthMeasureSpec); int widthMode = MeasureSpec.getMode(widthMeasureSpec); int height = MeasureSpec.getSize(heightMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int finalHeight = 0 ; for ( int i = 0 ; i < getChildCount(); i++) { View child = getChildAt(i); measureChild(child, widthMeasureSpec, heightMeasureSpec); finalHeight += child.getMeasuredHeight(); } if (widthMode == MeasureSpec.AT_MOST && heightMode == MeasureSpec.AT_MOST) { widthSize = getChildAt( 0 ).getMeasuredWidth(); setMeasuredDimension(widthSize, finalHeight); } else if (widthMode == MeasureSpec.AT_MOST) { widthSize = getChildAt( 0 ).getMeasuredWidth(); setMeasuredDimension(widthSize, height); } else { setMeasuredDimension(widthSize, finalHeight); } } @Override protected void onLayout( boolean changed, int l, int t, int r, int b) { int topOffset = 0 ; for ( int i = 0 ; i < getChildCount(); i++) { View child = getChildAt(i); child.layout(getPaddingLeft(), getPaddingTop() + topOffset, r, getPaddingTop() + child.getMeasuredHeight() + topOffset); topOffset += child.getMeasuredHeight(); } mInitScrollY = mHeadView.getMeasuredHeight() + getPaddingTop(); scrollTo( 0 , mInitScrollY); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { boolean intercepted = false ; int x = ( int ) ev.getX(); int y = ( int ) ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: mLastXIntercepted = x; mLastYIntercepted = y; break ; case MotionEvent.ACTION_MOVE: final int deltaY = x - mLastYIntercepted; if (isTop() && deltaY > 0 && Math.abs(deltaY) > mTouchSlop) { /*下拉*/ intercepted = true ; } break ; case MotionEvent.ACTION_UP: break ; } mLastXIntercepted = x; mLastYIntercepted = y; return intercepted; } private void doRefresh() { Log.i(TAG, "doRefresh: " ); if (currentStatus == STATUS_RELEASE_TO_REFRESH) { mScoller.startScroll( 0 , getScrollY(), 0 , mInitScrollY - getScrollY(), SCROLL_DURATION); currentStatus = STATUS_IDLE; } else if (currentStatus == STATUS_PULL_TO_REFRESH) { mScoller.startScroll( 0 ,getScrollY(), 0 , 0 -getScrollY(),SCROLL_DURATION); if ( null != mOnRefreshListener) { currentStatus = STATUS_LOADING; mOnRefreshListener.refresh(); } } invalidate(); } @Override public boolean onTouchEvent(MotionEvent event) { int x = ( int ) event.getX(); int y = ( int ) event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (!mScoller.isFinished()) { mScoller.abortAnimation(); } mLastX = x; mLastY = y; break ; case MotionEvent.ACTION_MOVE: if (isFistTouch) { isFistTouch = false ; mLastX = x; mLastY = y; } final int deltaY = y - mLastY; if (currentStatus != STATUS_LOADING) { changeScrollY(deltaY); } break ; case MotionEvent.ACTION_UP: isFistTouch = true ; doRefresh(); break ; } mLastX = x; mLastY = y; return true ; } private void changeScrollY( int deltaY) { Log.i(TAG, "changeScrollY: " ); int curY = getScrollY(); if (deltaY > 0 ) { /*下拉*/ if (curY - deltaY > getPaddingTop()) { scrollBy( 0 , -deltaY); } } else { /*上拉*/ if (curY - deltaY <= mInitScrollY) { scrollBy( 0 , -deltaY); } } curY = getScrollY(); int slop = mInitScrollY / 2 ; if (curY > 0 && curY <=slop) { currentStatus = STATUS_PULL_TO_REFRESH; } else if (curY > 0 && curY >= slop) { currentStatus = STATUS_RELEASE_TO_REFRESH; } } @Override public void computeScroll() { if (mScoller.computeScrollOffset()) { scrollTo(mScoller.getCurrX(), mScoller.getCurrY()); postInvalidate(); } } /** * 加载完成调用这个方法 */ public void refreshComplete() { mScoller.startScroll( 0 , getScrollY(), 0 , mInitScrollY - getScrollY(), SCROLL_DURATION); currentStatus = STATUS_IDLE; invalidate(); } /** * 显示 Footer */ public void showFooter() { if (currentStatus==STATUS_LOAD_MORE) return ; currentStatus = STATUS_LOAD_MORE ; mScoller.startScroll( 0 , getScrollY(), 0 , mFootView.getMeasuredHeight() , SCROLL_DURATION); invalidate(); } /** * loadMore完成之后调用 */ public void footerComplete() { mScoller.startScroll( 0 , getScrollY(), 0 , mInitScrollY - getScrollY(), SCROLL_DURATION); invalidate(); currentStatus = STATUS_IDLE; } public interface OnRefreshListener { void refresh(); } abstract boolean isTop(); abstract boolean isBottom(); } </t></code>它是一个抽象类，需要编写子类继承isTop()和 isBottom()方法、下面给出它的一个实现类：
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 <code class = "hljs cs" > package com.blueberry.sample.widget.refresh; import android.content.Context; import android.util.AttributeSet; import android.widget.AbsListView; import android.widget.ListView; /** * Created by blueberry on 2016/6/21. * * RefreshLayoutBase 的一个实现类 */ public class RefreshListView extends RefreshLayoutBase<listview> { private static final String TAG = "RefreshListView" ; private ListView listView; private OnLoadListener loadListener; public RefreshListView(Context context) { super (context); } public RefreshListView(Context context, AttributeSet attrs) { super (context, attrs); } public RefreshListView(Context context, AttributeSet attrs, int defStyleAttr) { super (context, attrs, defStyleAttr); } public ListView getListView() { return listView; } public void setListView( final ListView listView) { this .listView = listView; setContentView(listView); this .listView.setOnScrollListener( new AbsListView.OnScrollListener() { @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { /*这里存在一个bug: 当listView滑动到底部的时候，如果下拉也会出现footer * 这是因为，暂时还没有想到如何判断是下拉还是上拉。 * 如果要解决此问题，我觉得应该重写listView 的onTouchEvent来判断手势方向 * 次模块主要解决竖向滑动冲突，故现将此问题放下。 * */ if (currentStatus == STATUS_IDLE && getScrollY() <= mInitScrollY && isBottom() ) { showFooter(); if ( null != loadListener) { loadListener.onLoadMore(); } } } }); } public OnLoadListener getLoadListener() { return loadListener; } public void setLoadListener(OnLoadListener loadListener) { this .loadListener = loadListener; } @Override boolean isTop() { return listView.getFirstVisiblePosition() == 0 && getScrollY() <= mHeadView.getMeasuredHeight(); } @Override boolean isBottom() { return listView.getLastVisiblePosition() == listView.getAdapter().getCount() - 1 ; } public interface OnLoadListener { void onLoadMore(); } } </listview></code>4、内部拦截法解决同向滑动同样是一个下拉刷新组件，因为实现原理都一样，所以这个写的比较随意些。主要还是如果解决滑动冲突。RefreshLayoutBase2.java
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 <code class = "hljs java" > package com.blueberry.sample.widget.refresh; import android.content.Context; import android.graphics.Color; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Scroller; import com.blueberry.sample.R; import java.util.ArrayList; import java.util.List; /** * Created by blueberry on 2016/6/22. * 结合内部类 ListVieEx * 内部拦截法，同向 */ public class RefreshLayoutBase2 extends ViewGroup { private static final String TAG = "RefreshLayoutBase2" ; private static List<string> datas; static { datas = new ArrayList<>(); for ( int i = 0 ; i < 40 ; i++) { datas.add( "数据—" + i); } } private ViewGroup headView; private ListViewEx lv; private int lastY; public int mInitScrollY; private Scroller mScroller; public RefreshLayoutBase2(Context context) { this (context, null ); } public RefreshLayoutBase2(Context context, AttributeSet attrs) { this (context, attrs, 0 ); } public RefreshLayoutBase2(Context context, AttributeSet attrs, int defStyleAttr) { super (context, attrs, defStyleAttr); mScroller = new Scroller(context); setupHeadView(context); setupContentView(context); } @Override protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec) { int widthSize = MeasureSpec.getSize(widthMeasureSpec); int widthMode = MeasureSpec.getMode(widthMeasureSpec); int height = MeasureSpec.getSize(heightMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int finalHeight = 0 ; for ( int i = 0 ; i < getChildCount(); i++) { View child = getChildAt(i); measureChild(child, widthMeasureSpec, heightMeasureSpec); finalHeight += child.getMeasuredHeight(); } if (widthMode == MeasureSpec.AT_MOST && heightMode == MeasureSpec.AT_MOST) { widthSize = getChildAt( 0 ).getMeasuredWidth(); setMeasuredDimension(widthSize, finalHeight); } else if (widthMode == MeasureSpec.AT_MOST) { widthSize = getChildAt( 0 ).getMeasuredWidth(); setMeasuredDimension(widthSize, height); } else { setMeasuredDimension(widthSize, finalHeight); } } @Override protected void onLayout( boolean changed, int l, int t, int r, int b) { int topOffset = 0 ; for ( int i = 0 ; i < getChildCount(); i++) { View child = getChildAt(i); child.layout(getPaddingLeft(), getPaddingTop() + topOffset, r, getPaddingTop() + child.getMeasuredHeight() + topOffset); topOffset += child.getMeasuredHeight(); } mInitScrollY = headView.getMeasuredHeight() + getPaddingTop(); scrollTo( 0 , mInitScrollY); } /** * 不拦截Down 其他一律拦截 * @param ev * @return */ @Override public boolean onInterceptTouchEvent(MotionEvent ev) { if (ev.getAction() == MotionEvent.ACTION_DOWN) return false ; return true ; } @Override public boolean onTouchEvent(MotionEvent event) { int y = ( int ) event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: break ; case MotionEvent.ACTION_MOVE: final int deltaY = y-lastY; Log.i(TAG, "onTouchEvent: deltaY: " +deltaY); if (deltaY >= 0 && lv.isTop() && getScrollY() - deltaY >=getPaddingTop()) { scrollBy( 0 , -deltaY); } break ; case MotionEvent.ACTION_UP: this .postDelayed( new Runnable() { @Override public void run() { mScroller.startScroll( 0 ,getScrollY(), 0 ,mInitScrollY-getScrollY()); invalidate(); } }, 2000 ); break ; } lastY = y ; return true ; } private void setupHeadView(Context context) { headView = (ViewGroup) View.inflate(context, R.layout.fresh_head_view, null ); headView.setBackgroundColor(Color.RED); ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 300 ); addView(headView, params); } public void setupContentView(Context context) { lv = new ListViewEx(context, this ); lv.setBackgroundColor(Color.BLUE); ArrayAdapter<string> adapter = new ArrayAdapter<string>(getContext(), android.R.layout.simple_list_item_1, datas); lv.setAdapter(adapter); addView(lv, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()){ scrollTo(mScroller.getCurrX(),mScroller.getCurrY()); postInvalidate(); } } public static class ListViewEx extends ListView { private RefreshLayoutBase2 outter; public ListViewEx(Context context, RefreshLayoutBase2 outter) { super (context); this .outter = outter; } public ListViewEx(Context context, AttributeSet attrs) { super (context, attrs); } public ListViewEx(Context context, AttributeSet attrs, int defStyleAttr) { super (context, attrs, defStyleAttr); } /** * 使用 outter.requestDisallowInterceptTouchEvent(); * 来决定父控件是否对事件进行拦截 * @param ev * @return */ @Override public boolean dispatchTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: outter.requestDisallowInterceptTouchEvent( true ); break ; case MotionEvent.ACTION_MOVE: if ( isTop() && outter.getScrollY() <= outter.mInitScrollY) { outter.requestDisallowInterceptTouchEvent( false ); } break ; } return super .dispatchTouchEvent(ev); } public boolean isTop() { return getFirstVisiblePosition() == 0 ; } } }