标签：事件拦截 viewgroup嵌套 android手势冲突
转载请标明原文地址：简单灵活解决 Viewgroup嵌套 产生的手势冲突问题
这是接着上一篇Android 下拉刷新上拉加载 多种应用场景 超级大放送（上）的，这里介绍一下怎么 简单灵活解决Viewgroup嵌套产生的手势冲突问题。虽然这里只是以ViewPager为例，但是提供了一种解决此类问题的通用思路。
先来看一下网易新闻客户端的界面效果：
上一篇实现的Demo效果图，手势效果响应和上图一样
关于Viewgroup嵌套产生的手势冲突问题主要分为两类：
这里提供一种 解决以上问题的通用方案：
public class SubView1 extends View {
private static String TAG = SubView1.class.getSimpleName();
private GestureDetector mGestureDetector;
private Paint paint = new Paint();
public SubView1(Context context) {
super(context);
}
public SubView1(Context context, AttributeSet attrs) {
super(context, attrs);
// 为mGestureDetector设置监听器
mGestureDetector = new GestureDetector(context, new MTouchDetector());
// 保证能触发相应的事件
setFocusable(true);
setClickable(true);
setEnabled(true);
setLongClickable(true);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 指定宽和高
setMeasuredDimension(600, 200);
// super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
public void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
paint.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
canvas.drawColor((Color.parseColor("#FFA07A")));
canvas.drawText("SubView1", 100, 100, paint);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// L.i(TAG, "dispatchTouchEvent ACTION_DOWN");
break;
case MotionEvent.ACTION_MOVE:
// L.i(TAG, "dispatchTouchEvent ACTION_MOVE");
break;
case MotionEvent.ACTION_UP:
// L.i(TAG, "dispatchTouchEvent ACTION_UP");
break;
default:
break;
}
getParent().requestDisallowInterceptTouchEvent(true); // 先告诉父Viewgroup，不要拦截我我
mGestureDetector.onTouchEvent(event); // 通过GestureDetector将MotionEvent事件交给监听器OnGestureListener
return super.dispatchTouchEvent(event);
}
class MTouchDetector extends SimpleOnGestureListener {
// Touch down时触发
public boolean onDown(MotionEvent e) {
L.i(TAG, "onDown");
return super.onDown(e);
}
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
//tan(60°),手势与垂直方向大于30°,相应子View的onScroll,父Viewgroup的onScroll则不会响应
if (1.732*Math.abs(distanceX) >= Math.abs(distanceY)) {
L.i(TAG, "不要拦截我");
getParent().requestDisallowInterceptTouchEvent(true); // 告诉父Viewgroup不要拦截我，事件我自行处理
return true;
} else {
getParent().requestDisallowInterceptTouchEvent(false);// 告诉父Viewgroup拦截我，响应父Viewgroup的onScroll
L.i(TAG, "拦截我");
return false;
}
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
L.i(TAG, "onFling");
return super.onFling(e1, e2, velocityX, velocityY);
}
// 双击的第二下Touch down时触发
public boolean onDoubleTap(MotionEvent e) {
L.i(TAG, "onDoubleTap");
return super.onDoubleTap(e);
}
public boolean onDoubleTapEvent(MotionEvent e) {
L.i(TAG, "onDoubleTapEvent");
return super.onDoubleTapEvent(e);
}
}
} 再定义父ViewGrouppublic class MLinearLayout extends LinearLayout {
private static String TAG = MLinearLayout.class.getSimpleName();
// private static String TAG = SubView1.class.getSimpleName();
private GestureDetector mGestureDetector;
@SuppressLint("ClickableViewAccessibility")
public MLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
mGestureDetector = new GestureDetector(context, new MTouchDetector());
this.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return mGestureDetector.onTouchEvent(event);
}
});
setFocusable(true);
setClickable(true);
setEnabled(true);
setLongClickable(true);
}
@SuppressLint("NewApi")
public MLinearLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public MLinearLayout(Context context) {
super(context);
}
class MTouchDetector extends SimpleOnGestureListener {
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
L.i(TAG, "onScroll");
return true;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
mGestureDetector.onTouchEvent(event);
return false;
}
}<span style="font-size: 11.9999990463257px; font-family: Arial, Helvetica, sans-serif; background-color: rgb(254, 254, 254);"> </span>
/**
* @author wen_er
*
*/
public class MyViewPager extends ViewPager {
private static String TAG = MyViewPager.class.getSimpleName();
private GestureDetector mGestureDetector;
public MyViewPager(Context context) {
super(context);
mGestureDetector = new GestureDetector(context, new ScrollDetector());
}
public MyViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
// mGestureDetector = new GestureDetector(context, new
}
class ScrollDetector extends SimpleOnGestureListener {
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
if (Math.abs(distanceX) >= Math.abs(distanceY)) {
getParent().requestDisallowInterceptTouchEvent(true);// 告诉父viewGroup不要拦截我
return true;
} else {
getParent().requestDisallowInterceptTouchEvent(false);// 告诉父viewGroupw拦截我
return false;
}
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
L.i(TAG, "dispatchTouchEvent");
getParent().requestDisallowInterceptTouchEvent(true);
mGestureDetector.onTouchEvent(event);
return super.dispatchTouchEvent(event);
}
}
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标签：事件拦截 viewgroup嵌套 android手势冲突
原文地址：http://blog.csdn.net/yalinfendou/article/details/47814519
