1. 内部拦截法：
父容器不拦截事件，所有的事件全部都传递给子元素，如果子元素需要此事件就直接消耗掉，否则就交给父容器进行处理。
这种方法和Android中的事件分发机制不一样，需要配合requestDisallowInterceptTouchEvent方法才能正常工作，使用起来较外部拦截法稍显负责一点。
我们需要重写子元素的dispatchTouchEvent方法。
这种方法的伪代码是：
1 @Override
2 public boolean dispatchTouchEvent(MotionEvent event) {
3 int x = (int) event.getX();
4 int y = (int) event.getY();
5
6 switch (event.getAction()) {
7 case MotionEvent.ACTION_DOWN: {
8 parent.requestDisallowInterceptTouchEvent(true);
9 break;
10 }
11 case MotionEvent.ACTION_MOVE: {
12 int deltaX = x - mLastX;
13 int deltaY = y - mLastY;
14 if (父容器需要此类点击事件) {
15 parent.requestDisallowInterceptTouchEvent(false);
16 }
17 break;
18 }
19 case MotionEvent.ACTION_UP: {
20 break;
21 }
22 default:
23 break;
24 }
25
26 mLastX = x;
27 mLastY = y;
28 return super.dispatchTouchEvent(event);
29 }
上面重写的子元素的dispatchTouchEvent方法，这里同时需要重写父容器的onInterceptTouchEvent方法，为什么呢？
那是因为ACTION_DOWN事件并不受FLAG_DISALLOW_INTERCEPT这个标记位的控制，所以一旦父容器拦截ACTION_DOWN事件，那么所有的事件都无法传递到子元素之中，这样内部拦截法就无法起作用了。
父容器所做的修改如下：
1 @Override
2 public boolean onInterceptTouchEvent(MotionEvent event) {
3
4 int action = event.getAction();
5 if (action == MotionEvent.ACTION_DOWN) {
6 return false;
7 } else {
8 return true;
9 }
10 }
2. 下面通过一个Demo示例说明：
（1）首先我们创建一个Android工程，如下：
（2）首先我们来到主布局activity_main.xml，如下：
1 <com.himi.viewconflict1.ui.RevealLayout
2 xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:tools="http://schemas.android.com/tools"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent"
6 android:orientation="vertical"
7 android:padding="12dp"
8 tools:context="${relativePackage}.${activityClass}" >
9
10 <Button
11 android:id="@+id/button1"
12 style="@style/AppTheme.Button.Green"
13 android:onClick="onButtonClick"
14 android:text="滑动冲突场景1-内部拦截" />
15
16 </com.himi.viewconflict1.ui.RevealLayout>
（3）接下来来到MainActivity，如下：
1 package com.himi.viewconflict;
2
3 import android.app.Activity;
4 import android.content.Intent;
5 import android.os.Bundle;
6 import android.view.View;
7
8 public class MainActivity extends Activity {
9
10 @Override
11 protected void onCreate(Bundle savedInstanceState) {
12 super.onCreate(savedInstanceState);
13 setContentView(R.layout.activity_main);
14 }
15
16
17
18 public void onButtonClick(View view) {
19 Intent intent = new Intent(this, DemoActivity_1.class);
20 startActivity(intent);
21 }
22 }
（4）上面很自然地跳转到DemoActivity_2之中，如下：
1 package com.himi.viewconflict1;
2
3 import java.util.ArrayList;
4
5 import com.himi.viewconflict1.ui.HorizontalScrollViewEx2;
6 import com.himi.viewconflict1.ui.ListViewEx;
7 import com.himi.viewconflict1.utils.MyUtils;
8
9 import android.app.Activity;
10 import android.graphics.Color;
11 import android.os.Bundle;
12 import android.util.Log;
13 import android.view.LayoutInflater;
14 import android.view.MotionEvent;
15 import android.view.View;
16 import android.view.ViewGroup;
17 import android.widget.AdapterView;
18 import android.widget.AdapterView.OnItemClickListener;
19 import android.widget.ArrayAdapter;
20 import android.widget.TextView;
21 import android.widget.Toast;
22
23 public class DemoActivity_2 extends Activity {
24 private static final String TAG = "DemoActivity_2";
25
26 private HorizontalScrollViewEx2 mListContainer;
27
28 @Override
29 protected void onCreate(Bundle savedInstanceState) {
30 super.onCreate(savedInstanceState);
31 setContentView(R.layout.demo_2);
32 Log.d(TAG, "onCreate");
33 initView();
34 }
35
36 private void initView() {
37 LayoutInflater inflater = getLayoutInflater();
38 mListContainer = (HorizontalScrollViewEx2) findViewById(R.id.container);
39 final int screenWidth = MyUtils.getScreenMetrics(this).widthPixels;
40 final int screenHeight = MyUtils.getScreenMetrics(this).heightPixels;
41 for (int i = 0; i < 3; i++) {
42 ViewGroup layout = (ViewGroup) inflater.inflate(
43 R.layout.content_layout2, mListContainer, false);
44 layout.getLayoutParams().width = screenWidth;
45 TextView textView = (TextView) layout.findViewById(R.id.title);
46 textView.setText("page " + (i + 1));
47 layout.setBackgroundColor(Color
48 .rgb(255 / (i + 1), 255 / (i + 1), 0));
49 createList(layout);
50 mListContainer.addView(layout);
51 }
52 }
53
54 private void createList(ViewGroup layout) {
55 ListViewEx listView = (ListViewEx) layout.findViewById(R.id.list);
56 ArrayList<String> datas = new ArrayList<String>();
57 for (int i = 0; i < 50; i++) {
58 datas.add("name " + i);
59 }
60 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
61 R.layout.content_list_item, R.id.name, datas);
62 listView.setAdapter(adapter);
63 listView.setHorizontalScrollViewEx2(mListContainer);
64 listView.setOnItemClickListener(new OnItemClickListener() {
65 @Override
66 public void onItemClick(AdapterView<?> parent, View view,
67 int position, long id) {
68 Toast.makeText(DemoActivity_2.this, "click item "+position,
69 Toast.LENGTH_SHORT).show();
70
71 }
72 });
73 }
74
75 @Override
76 public boolean dispatchTouchEvent(MotionEvent ev) {
77 Log.d(TAG, "dispatchTouchEvent action:" + ev.getAction());
78 return super.dispatchTouchEvent(ev);
79 }
80
81 @Override
82 public boolean onTouchEvent(MotionEvent event) {
83 Log.d(TAG, "onTouchEvent action:" + event.getAction());
84 return super.onTouchEvent(event);
85 }
86 }
上面的DemoActivity_2主布局demo_2.xml，如下：
1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:background="#ffffff" 6 android:orientation="vertical" > 7 8 <com.himi.viewconflict1.ui.HorizontalScrollViewEx2 9 android:id="@+id/container" 10 android:layout_width="wrap_content" 11 android:layout_height="match_parent" /> 12 13 14 </LinearLayout>
上面使用到HorizontalScrollViewEx2是自定义控件（继承自ViewGroup），如下：
HorizontalScrollViewEx2是父容器，这里需要重写它的onInterceptTouchEvent方法，让父容器不拦截ACTION_DOWN事件。
1 package com.himi.viewconflict1.ui;
2
3 import android.content.Context;
4 import android.util.AttributeSet;
5 import android.util.Log;
6 import android.view.MotionEvent;
7 import android.view.VelocityTracker;
8 import android.view.View;
9 import android.view.ViewGroup;
10 import android.widget.Scroller;
11
12 public class HorizontalScrollViewEx2 extends ViewGroup {
13 private static final String TAG = "HorizontalScrollViewEx2";
14
15 private int mChildrenSize;
16 private int mChildWidth;
17 private int mChildIndex;
18 // 分别记录上次滑动的坐标
19 private int mLastX = 0;
20 private int mLastY = 0;
21
22 // 分别记录上次滑动的坐标(onInterceptTouchEvent)
23 private int mLastXIntercept = 0;
24 private int mLastYIntercept = 0;
25
26 private Scroller mScroller;
27 private VelocityTracker mVelocityTracker;
28
29 public HorizontalScrollViewEx2(Context context) {
30 super(context);
31 init();
32 }
33
34 public HorizontalScrollViewEx2(Context context, AttributeSet attrs) {
35 super(context, attrs);
36 init();
37 }
38
39 public HorizontalScrollViewEx2(Context context, AttributeSet attrs,
40 int defStyle) {
41 super(context, attrs, defStyle);
42 init();
43 }
44
45 private void init() {
46 mScroller = new Scroller(getContext());
47 mVelocityTracker = VelocityTracker.obtain();
48 }
49
50 @Override
51 public boolean onInterceptTouchEvent(MotionEvent event) {
52 int x = (int) event.getX();
53 int y = (int) event.getY();
54 int action = event.getAction();
55 if (action == MotionEvent.ACTION_DOWN) {
56 mLastX = x;
57 mLastY = y;
58 if (!mScroller.isFinished()) {
59 mScroller.abortAnimation();
60 return true;
61 }
62 return false;
63 } else {
64 return true;
65 }
66 }
67
68 @Override
69 public boolean onTouchEvent(MotionEvent event) {
70 Log.d(TAG, "onTouchEvent action:" + event.getAction());
71 mVelocityTracker.addMovement(event);
72 int x = (int) event.getX();
73 int y = (int) event.getY();
74 switch (event.getAction()) {
75 case MotionEvent.ACTION_DOWN: {
76 if (!mScroller.isFinished()) {
77 mScroller.abortAnimation();
78 }
79 break;
80 }
81 case MotionEvent.ACTION_MOVE: {
82 int deltaX = x - mLastX;
83 int deltaY = y - mLastY;
84 Log.d(TAG, "move, deltaX:" + deltaX + " deltaY:" + deltaY);
85 scrollBy(-deltaX, 0);
86 break;
87 }
88 case MotionEvent.ACTION_UP: {
89 int scrollX = getScrollX();
90 int scrollToChildIndex = scrollX / mChildWidth;
91 Log.d(TAG, "current index:" + scrollToChildIndex);
92 mVelocityTracker.computeCurrentVelocity(1000);
93 float xVelocity = mVelocityTracker.getXVelocity();
94 if (Math.abs(xVelocity) >= 50) {
95 mChildIndex = xVelocity > 0 ? mChildIndex - 1 : mChildIndex + 1;
96 } else {
97 mChildIndex = (scrollX + mChildWidth / 2) / mChildWidth;
98 }
99 mChildIndex = Math.max(0, Math.min(mChildIndex, mChildrenSize - 1));
100 int dx = mChildIndex * mChildWidth - scrollX;
101 smoothScrollBy(dx, 0);
102 mVelocityTracker.clear();
103 Log.d(TAG, "index:" + scrollToChildIndex + " dx:" + dx);
104 break;
105 }
106 default:
107 break;
108 }
109
110 mLastX = x;
111 mLastY = y;
112 return true;
113 }
114
115 @Override
116 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
117 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
118 int measuredWidth = 0;
119 int measuredHeight = 0;
120 final int childCount = getChildCount();
121 measureChildren(widthMeasureSpec, heightMeasureSpec);
122
123 int widthSpaceSize = MeasureSpec.getSize(widthMeasureSpec);
124 int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
125 int heightSpaceSize = MeasureSpec.getSize(heightMeasureSpec);
126 int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
127 if (childCount == 0) {
128 setMeasuredDimension(0, 0);
129 } else if (heightSpecMode == MeasureSpec.AT_MOST) {
130 final View childView = getChildAt(0);
131 measuredHeight = childView.getMeasuredHeight();
132 setMeasuredDimension(widthSpaceSize, childView.getMeasuredHeight());
133 } else if (widthSpecMode == MeasureSpec.AT_MOST) {
134 final View childView = getChildAt(0);
135 measuredWidth = childView.getMeasuredWidth() * childCount;
136 setMeasuredDimension(measuredWidth, heightSpaceSize);
137 } else {
138 final View childView = getChildAt(0);
139 measuredWidth = childView.getMeasuredWidth() * childCount;
140 measuredHeight = childView.getMeasuredHeight();
141 setMeasuredDimension(measuredWidth, measuredHeight);
142 }
143 }
144
145 @Override
146 protected void onLayout(boolean changed, int l, int t, int r, int b) {
147 Log.d(TAG, "width:" + getWidth());
148 int childLeft = 0;
149 final int childCount = getChildCount();
150 mChildrenSize = childCount;
151
152 for (int i = 0; i < childCount; i++) {
153 final View childView = getChildAt(i);
154 if (childView.getVisibility() != View.GONE) {
155 final int childWidth = childView.getMeasuredWidth();
156 mChildWidth = childWidth;
157 childView.layout(childLeft, 0, childLeft + childWidth,
158 childView.getMeasuredHeight());
159 childLeft += childWidth;
160 }
161 }
162 }
163
164 private void smoothScrollBy(int dx, int dy) {
165 mScroller.startScroll(getScrollX(), 0, dx, 0, 500);
166 invalidate();
167 }
168
169 @Override
170 public void computeScroll() {
171 if (mScroller.computeScrollOffset()) {
172 scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
173 postInvalidate();
174 }
175 }
176
177 @Override
178 protected void onDetachedFromWindow() {
179 mVelocityTracker.recycle();
180 super.onDetachedFromWindow();
181 }
182 }
（5）来到主布局之中，在HorizontalScrollViewEx2之中包含一个子布局content_layout2.xml，如下：
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:orientation="vertical" > 6 7 <TextView 8 android:id="@+id/title" 9 android:layout_width="wrap_content" 10 android:layout_height="wrap_content" 11 android:layout_marginTop="5dp" 12 android:layout_marginBottom="5dp" 13 android:text="TextView" /> 14 15 <com.himi.viewconflict1.ui.ListViewEx 16 android:id="@+id/list" 17 android:layout_width="match_parent" 18 android:layout_height="match_parent" 19 android:background="#fff4f7f9" 20 android:cacheColorHint="#00000000" 21 android:divider="#dddbdb" 22 android:dividerHeight="1.0px" 23 android:listSelector="@android:color/transparent" /> 24 25 </LinearLayout>
上面的ListViewEx是自定义的控件（继承自ListView），在ListViewEx里面实现了内部拦截法的逻辑，如下：
1 package com.himi.viewconflict1.ui;
2
3 import android.content.Context;
4 import android.util.AttributeSet;
5 import android.util.Log;
6 import android.view.MotionEvent;
7 import android.widget.ListView;
8
9 public class ListViewEx extends ListView {
10 private static final String TAG = "ListViewEx";
11
12 private HorizontalScrollViewEx2 mHorizontalScrollViewEx2;
13
14 // 分别记录上次滑动的坐标
15 private int mLastX = 0;
16 private int mLastY = 0;
17
18 public ListViewEx(Context context) {
19 super(context);
20 }
21
22 public ListViewEx(Context context, AttributeSet attrs) {
23 super(context, attrs);
24 }
25
26 public ListViewEx(Context context, AttributeSet attrs, int defStyle) {
27 super(context, attrs, defStyle);
28 }
29
30 public void setHorizontalScrollViewEx2(
31 HorizontalScrollViewEx2 horizontalScrollViewEx2) {
32 mHorizontalScrollViewEx2 = horizontalScrollViewEx2;
33 }
34
35 @Override
36 public boolean dispatchTouchEvent(MotionEvent event) {
37 int x = (int) event.getX();
38 int y = (int) event.getY();
39
40 switch (event.getAction()) {
41 case MotionEvent.ACTION_DOWN: {
42 mHorizontalScrollViewEx2.requestDisallowInterceptTouchEvent(true);
43 break;
44 }
45 case MotionEvent.ACTION_MOVE: {
46 int deltaX = x - mLastX;
47 int deltaY = y - mLastY;
48 Log.d(TAG, "dx:" + deltaX + " dy:" + deltaY);
49 if (Math.abs(deltaX) > Math.abs(deltaY)) {
50 mHorizontalScrollViewEx2.requestDisallowInterceptTouchEvent(false);
51 }
52 break;
53 }
54 case MotionEvent.ACTION_UP: {
55 break;
56 }
57 default:
58 break;
59 }
60
61 mLastX = x;
62 mLastY = y;
63 return super.dispatchTouchEvent(event);
64 }
65
66 }
接下来，来到Listview的Item布局content_list_item.xml，如下：
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="50dp" 5 android:gravity="center_vertical" 6 android:orientation="vertical" > 7 8 <TextView 9 android:id="@+id/name" 10 android:layout_width="wrap_content" 11 android:layout_height="wrap_content" 12 android:text="TextView" /> 13 14 </LinearLayout>
（6）最终项目如下：
（7）部署程序到手机上，如下：
3. 示例源码下载
时间： 2024-08-08 18:42:18