李氏滑动事件冲突解决方案 之 处理子ViewGroup的超棒方案

  父ViewGroup(CurView) 和 子 ViewGroup(ParentView) 滑动事件冲突解决方案 之 处理子ViewGroup的超棒方案:

子ViewGroup 以 SlipRelativeLayout 为例子:

  • 当 mEnableX=true, mEnableY=false 时, SlipRelativeLayout 中所有的 横向滑动事件都交给自己处理,横向滑动事件都交给 ParentView 处理;
  • 当 mEnableX=false, mEnableY=true 时, SlipRelativeLayout 中所有的 纵向滑动事件都交给自己处理,纵向滑动事件都交给 ParentView 处理;
  • 当 mEnableX=true, mEnableY=true 时, SlipRelativeLayout 中所有的 横向和纵向滑动事件都交给自己处理,ParentView 不处理任何事件;
  • 当 mEnableX=false, mEnableY=false 时, SlipRelativeLayout 中所有的 自己不处理任何滑动事件,所有事件都交给 ParentView 处理;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewParent;
import android.widget.RelativeLayout; public class SlipRelativeLayout extends RelativeLayout { public static final String TAG = "SlipRelativeLayout"; private boolean mEnable = false, mEnableX = true, mEnableY = false; private float xDistance, yDistance;
private float xStart, yStart;
private float xEnd, yEnd; public SlipRelativeLayout(@NonNull Context context) {
super(context);
} public SlipRelativeLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
} public SlipRelativeLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
} public boolean ismEnable() {
return mEnable;
} public void setmEnable(boolean mEnable) {
this.mEnable = mEnable;
} public boolean ismEnableX() {
return mEnableX;
} public void setmEnableX(boolean mEnableX) {
this.mEnableX = mEnableX;
} public boolean ismEnableY() {
return mEnableY;
} public void setmEnableY(boolean mEnableY) {
this.mEnableY = mEnableY;
} @Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return super.onInterceptTouchEvent(ev); } @Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (null == ev) return false;//不截事件
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
xDistance = yDistance = 0f;
xStart = ev.getX();
yStart = ev.getY();
getParent().requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_MOVE:
xEnd = ev.getX();
yEnd = ev.getY();
xDistance = xEnd - xStart;
yDistance = yEnd - yStart;
getParent().requestDisallowInterceptTouchEvent(needIntercept());
break;
default:
break; }
return super.dispatchTouchEvent(ev);
} private boolean needIntercept() {
ViewParent viewparent = getParent();
if (null != viewparent) {
boolean disallowIntercept;
float distance = Math.abs(xDistance) - Math.abs(yDistance);
if ((mEnableX && distance > 0) || (mEnableY && distance < 0) || mEnable) {//拦截X事件向下分发
disallowIntercept = true;
} else {
disallowIntercept = false;
}
return disallowIntercept;
}
return false;
} }
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