Android 滑动拦截实例代码解析

废话不多说了，直接给大家贴代码了，具体代码如下所示：

 package demo.hq.com.fby;
import android.content.context;
import android.util.attributeset;
import android.util.log;
import android.view.motionevent;
import android.widget.linearlayout;
/**
 * created by huqing on 2016/12/7.
 * 思路：
 * 分内外部拦截
 * 在父布局中，onintercepttouchevent先判断是否拦截滑动，true 拦截 直接进入父布局的ontouch方法 ；false 进入子布局的ontouch方法
 */
public class myparentview extends linearlayout
{
  /**
   * 每向下move移动的距离
   */
  private int mmove;
  /**
   * 落下点的位置
   */
  private int ydown;
  /**
   * 移动点的位置
   */
  private int ymove;
  /**
   * 一共向下挪动的距离
   */
  private int downdistance = 0;
  public myparentview(context context, attributeset attrs)
  {
    super(context, attrs);
  }
  boolean intercept = false;
  /**
   * 外部拦截，
   * 如果是向下滑动 则为true,交给该控件处理，向上false就交给子控件处理吧
   * 所以向上的事件 子控件都能获取到的
   *
   * @param ev
   * @return
   */
  @override
  public boolean onintercepttouchevent(motionevent ev)
  {
    switch (ev.getaction())
    {
      case motionevent.action_down:
        ydown =(int) ev.gety();
        break;
      case motionevent.action_move:
        ymove = (int) ev.gety();
        if (ymove > ydown)
        {
          intercept = true;
          log.d("hqq", "拦截~~~~~~~~~~~~~~~~~~");
        }
        else if (ymove < ydown)
        {
          intercept = false;
          log.d("hqq", "不拦截~~~~~~~~~~~~~~~~~~");
        }
        break;
      case motionevent.action_up:
        break;
    }
    //true 拦截，进入该控件的ontouchevent方法 false：进入子控件的ontouchevent
    boolean returnintercept = intercept;
    intercept = false;
    return returnintercept;
  }
  @override
  public boolean ontouchevent(motionevent event)
  {
    log.e("hq", "father ontouch");
    int y = (int) event.gety();
    switch (event.getaction())
    {
      case motionevent.action_down:
        ydown = y;
        break;
      case motionevent.action_move:
        if (downdistance>=250){
        }else {
          ymove = y;
          if (ymove - ydown > 0)
          {
            mmove = ymove - ydown;
            downdistance += mmove;
            if (downdistance>=250){
              layout(getleft(),downdistance, getright(), getheight() + downdistance);
            }else {
              layout(getleft(), gettop() + mmove, getright(), getbottom() + mmove);
            }
          }
        }
        break;
      case motionevent.action_up:
        layout(getleft(), gettop() - downdistance, getright(), getbottom() - downdistance);
        downdistance = 0;
        break;
    }
    return true;//    return super.ontouchevent(event);
  }
}

package demo.hq.com.fby;
import android.content.context;
import android.util.attributeset;
import android.util.log;
import android.view.motionevent;
import android.widget.scrollview;
/**
 * created by huqing on 2016/12/7.
 */
public class myscrollview extends scrollview
{
  public myscrollview(context context, attributeset attrs)
  {
    super(context, attrs);
  }
  @override
  public boolean ontouchevent(motionevent ev)
  {
    log.e("hq","child ontouch----------------");
    switch (ev.getaction()){
      case motionevent.action_down:
        getparent().requestdisallowintercepttouchevent(true);
        break;
      case motionevent.action_move:
        if (getscrolly()==0){//scrollview没有滑动时 ，即滑动高度没变化的话就允许父控件拦截
          getparent().requestdisallowintercepttouchevent(false);
        }else {//禁止拦截
          getparent().requestdisallowintercepttouchevent(true);
        }
        break;
    }
    return super.ontouchevent(ev);
  }
}

<?xml version="1.0" encoding="utf-8"?>
<relativelayout
  android:id="@+id/activity_main"
  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="@drawable/bg"
  tools:context="demo.hq.com.fby.mainactivity">
  <demo.hq.com.fby.myparentview
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ffffff"
    android:orientation="vertical">
    <textview
      android:layout_width="wrap_content"
      android:layout_height="100dp"
      android:text=" world!"/>
    <textview
      android:layout_width="wrap_content"
      android:layout_height="100dp"
      android:text=" world!"/>
    <demo.hq.com.fby.myscrollview android:layout_width="match_parent"
                   android:layout_height="wrap_content">
      <linearlayout android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical">
        <textview
          android:layout_width="wrap_content"
          android:layout_height="200dp"
          android:text="hello world!"/>
        <textview
          android:layout_width="wrap_content"
          android:layout_height="200dp"
          android:text="hello world!"/>
      </linearlayout>
    </demo.hq.com.fby.myscrollview>
  </demo.hq.com.fby.myparentview>
</relativelayout>

以上所述是小编给大家介绍的android 滑动拦截实例代码解析，希望对大家有所帮助