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：
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY(); switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
parent.requestDisallowInterceptTouchEvent(true);
break;
}
case MotionEvent.ACTION_MOVE: {
int deltaX = x - mLastX;
int deltaY = y - mLastY;
if (父容器需要此类点击事件) {
parent.requestDisallowInterceptTouchEvent(false);
}
break;
}
case MotionEvent.ACTION_UP: {
break;
}
default:
break;
} mLastX = x;
mLastY = y;
return super.dispatchTouchEvent(event);
}
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：
@Override
public boolean onInterceptTouchEvent(MotionEvent event) { int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
return false;
} else {
return true;
}
}
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：
<com.himi.viewconflict1.ui.RevealLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="12dp"
tools:context="${relativePackage}.${activityClass}" > <Button
android:id="@+id/button1"
style="@style/AppTheme.Button.Green"
android:onClick="onButtonClick"
android:text="滑动冲突场景1-内部拦截" /> </com.himi.viewconflict1.ui.RevealLayout>
（3）接下来来到MainActivity，如下：
package com.himi.viewconflict; import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View; public class MainActivity extends Activity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
} public void onButtonClick(View view) {
Intent intent = new Intent(this, DemoActivity_1.class);
startActivity(intent);
}
}
（4）上面很自然地跳转到DemoActivity_2之中，如下：
package com.himi.viewconflict1; import java.util.ArrayList; import com.himi.viewconflict1.ui.HorizontalScrollViewEx2;
import com.himi.viewconflict1.ui.ListViewEx;
import com.himi.viewconflict1.utils.MyUtils; import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.widget.Toast; public class DemoActivity_2 extends Activity {
private static final String TAG = "DemoActivity_2"; private HorizontalScrollViewEx2 mListContainer; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo_2);
Log.d(TAG, "onCreate");
initView();
} private void initView() {
LayoutInflater inflater = getLayoutInflater();
mListContainer = (HorizontalScrollViewEx2) findViewById(R.id.container);
final int screenWidth = MyUtils.getScreenMetrics(this).widthPixels;
final int screenHeight = MyUtils.getScreenMetrics(this).heightPixels;
for (int i = 0; i < 3; i++) {
ViewGroup layout = (ViewGroup) inflater.inflate(
R.layout.content_layout2, mListContainer, false);
layout.getLayoutParams().width = screenWidth;
TextView textView = (TextView) layout.findViewById(R.id.title);
textView.setText("page " + (i + 1));
layout.setBackgroundColor(Color
.rgb(255 / (i + 1), 255 / (i + 1), 0));
createList(layout);
mListContainer.addView(layout);
}
} private void createList(ViewGroup layout) {
ListViewEx listView = (ListViewEx) layout.findViewById(R.id.list);
ArrayList<String> datas = new ArrayList<String>();
for (int i = 0; i < 50; i++) {
datas.add("name " + i);
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.content_list_item, R.id.name, datas);
listView.setAdapter(adapter);
listView.setHorizontalScrollViewEx2(mListContainer);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(DemoActivity_2.this, "click item "+position,
Toast.LENGTH_SHORT).show(); }
});
} @Override
public boolean dispatchTouchEvent(MotionEvent ev) {
Log.d(TAG, "dispatchTouchEvent action:" + ev.getAction());
return super.dispatchTouchEvent(ev);
} @Override
public boolean onTouchEvent(MotionEvent event) {
Log.d(TAG, "onTouchEvent action:" + event.getAction());
return super.onTouchEvent(event);
}
}
上面的DemoActivity_2主布局demo_2.xml，如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:orientation="vertical" > <com.himi.viewconflict1.ui.HorizontalScrollViewEx2
android:id="@+id/container"
android:layout_width="wrap_content"
android:layout_height="match_parent" /> </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。
package com.himi.viewconflict1.ui; import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Scroller; public class HorizontalScrollViewEx2 extends ViewGroup {
private static final String TAG = "HorizontalScrollViewEx2"; private int mChildrenSize;
private int mChildWidth;
private int mChildIndex;
// 分别记录上次滑动的坐标
private int mLastX = 0;
private int mLastY = 0; // 分别记录上次滑动的坐标(onInterceptTouchEvent)
private int mLastXIntercept = 0;
private int mLastYIntercept = 0; private Scroller mScroller;
private VelocityTracker mVelocityTracker; public HorizontalScrollViewEx2(Context context) {
super(context);
init();
} public HorizontalScrollViewEx2(Context context, AttributeSet attrs) {
super(context, attrs);
init();
} public HorizontalScrollViewEx2(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
init();
} private void init() {
mScroller = new Scroller(getContext());
mVelocityTracker = VelocityTracker.obtain();
} @Override
public boolean onInterceptTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
mLastX = x;
mLastY = y;
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
return true;
}
return false;
} else {
return true;
}
} @Override
public boolean onTouchEvent(MotionEvent event) {
Log.d(TAG, "onTouchEvent action:" + event.getAction());
mVelocityTracker.addMovement(event);
int x = (int) event.getX();
int y = (int) event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
break;
}
case MotionEvent.ACTION_MOVE: {
int deltaX = x - mLastX;
int deltaY = y - mLastY;
Log.d(TAG, "move, deltaX:" + deltaX + " deltaY:" + deltaY);
scrollBy(-deltaX, 0);
break;
}
case MotionEvent.ACTION_UP: {
int scrollX = getScrollX();
int scrollToChildIndex = scrollX / mChildWidth;
Log.d(TAG, "current index:" + scrollToChildIndex);
mVelocityTracker.computeCurrentVelocity(1000);
float xVelocity = mVelocityTracker.getXVelocity();
if (Math.abs(xVelocity) >= 50) {
mChildIndex = xVelocity > 0 ? mChildIndex - 1 : mChildIndex + 1;
} else {
mChildIndex = (scrollX + mChildWidth / 2) / mChildWidth;
}
mChildIndex = Math.max(0, Math.min(mChildIndex, mChildrenSize - 1));
int dx = mChildIndex * mChildWidth - scrollX;
smoothScrollBy(dx, 0);
mVelocityTracker.clear();
Log.d(TAG, "index:" + scrollToChildIndex + " dx:" + dx);
break;
}
default:
break;
} mLastX = x;
mLastY = y;
return true;
} @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int measuredWidth = 0;
int measuredHeight = 0;
final int childCount = getChildCount();
measureChildren(widthMeasureSpec, heightMeasureSpec); int widthSpaceSize = MeasureSpec.getSize(widthMeasureSpec);
int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
int heightSpaceSize = MeasureSpec.getSize(heightMeasureSpec);
int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
if (childCount == 0) {
setMeasuredDimension(0, 0);
} else if (heightSpecMode == MeasureSpec.AT_MOST) {
final View childView = getChildAt(0);
measuredHeight = childView.getMeasuredHeight();
setMeasuredDimension(widthSpaceSize, childView.getMeasuredHeight());
} else if (widthSpecMode == MeasureSpec.AT_MOST) {
final View childView = getChildAt(0);
measuredWidth = childView.getMeasuredWidth() * childCount;
setMeasuredDimension(measuredWidth, heightSpaceSize);
} else {
final View childView = getChildAt(0);
measuredWidth = childView.getMeasuredWidth() * childCount;
measuredHeight = childView.getMeasuredHeight();
setMeasuredDimension(measuredWidth, measuredHeight);
}
} @Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
Log.d(TAG, "width:" + getWidth());
int childLeft = 0;
final int childCount = getChildCount();
mChildrenSize = childCount; for (int i = 0; i < childCount; i++) {
final View childView = getChildAt(i);
if (childView.getVisibility() != View.GONE) {
final int childWidth = childView.getMeasuredWidth();
mChildWidth = childWidth;
childView.layout(childLeft, 0, childLeft + childWidth,
childView.getMeasuredHeight());
childLeft += childWidth;
}
}
} private void smoothScrollBy(int dx, int dy) {
mScroller.startScroll(getScrollX(), 0, dx, 0, 500);
invalidate();
} @Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
}
} @Override
protected void onDetachedFromWindow() {
mVelocityTracker.recycle();
super.onDetachedFromWindow();
}
}
（5）来到主布局之中，在HorizontalScrollViewEx2之中包含一个子布局content_layout2.xml，如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" > <TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:text="TextView" /> <com.himi.viewconflict1.ui.ListViewEx
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fff4f7f9"
android:cacheColorHint="#00000000"
android:divider="#dddbdb"
android:dividerHeight="1.0px"
android:listSelector="@android:color/transparent" /> </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：
package com.himi.viewconflict1.ui; import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ListView; public class ListViewEx extends ListView {
private static final String TAG = "ListViewEx"; private HorizontalScrollViewEx2 mHorizontalScrollViewEx2; // 分别记录上次滑动的坐标
private int mLastX = 0;
private int mLastY = 0; public ListViewEx(Context context) {
super(context);
} public ListViewEx(Context context, AttributeSet attrs) {
super(context, attrs);
} public ListViewEx(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
} public void setHorizontalScrollViewEx2(
HorizontalScrollViewEx2 horizontalScrollViewEx2) {
mHorizontalScrollViewEx2 = horizontalScrollViewEx2;
} @Override
public boolean dispatchTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY(); switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
mHorizontalScrollViewEx2.requestDisallowInterceptTouchEvent(true);
break;
}
case MotionEvent.ACTION_MOVE: {
int deltaX = x - mLastX;
int deltaY = y - mLastY;
Log.d(TAG, "dx:" + deltaX + " dy:" + deltaY);
if (Math.abs(deltaX) > Math.abs(deltaY)) {
mHorizontalScrollViewEx2.requestDisallowInterceptTouchEvent(false);
}
break;
}
case MotionEvent.ACTION_UP: {
break;
}
default:
break;
} mLastX = x;
mLastY = y;
return super.dispatchTouchEvent(event);
} }
void requestDisallowInterceptTouchEvent（boolean disallowIntercept）：
这个方法的入参一个boolean 变量，用来表示是否需要调用onInterceptTouchEvent来判断是否拦截.
该标记如果为True，就如它的字面意思一样---不允许调用onInterceptTouchEvent()，结果就是，所有的父类方法都不会进行拦截，而把事件传递给子View. 该方法属于ViewGroup ，并且是个递归方法，也就是说一旦调用后，所有父类的disallowIntercept都会设置成True。即当前View的所有父类View，都不会调用自身的onInterceptTouchEvent()进行拦截。
该标记如果为False，就如它的字面意思一样---允许调用onInterceptTouchEvent()，结果就是，父类可以拦截事件。
接下来，来到Listview的Item布局content_list_item.xml，如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center_vertical"
android:orientation="vertical" > <TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" /> </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