Android编程中ViewPage判断左右滑动方向的方法

本文实例讲述了Android编程中ViewPage判断左右滑动方向的方法。分享给大家供大家参考，具体如下：

package com.meityitian.app.views;
import android.content.Context; 
import android.support.v4.view.ViewPager; 
import android.util.AttributeSet; 
import android.util.Log; 
import com.meityitian.app.utils.Debug; 
 
public class meityitianViewPager extends ViewPager { 
 private boolean left = false; 
 private boolean right = false; 
 private boolean isScrolling = false; 
 private int lastValue = -1; 
 private ChangeViewCallback changeViewCallback = null; 
 public meityitianViewPager(Context context, AttributeSet attrs) { 
  super(context, attrs); 
  init(); 
 } 
 public meityitianViewPager(Context context) { 
  super(context); 
  init(); 
 } 
  
 private void init() { 
  setOnPageChangeListener(listener); 
 } 
  
 public OnPageChangeListener listener = new OnPageChangeListener() { 
  @Override 
  public void onPageScrollStateChanged(int arg0) { 
   if (arg0 == 1) { 
    isScrolling = true; 
   } else { 
    isScrolling = false; 
   } 
   Debug.infoByTag("meityitianViewPager", 
     "meityitianViewPager onPageScrollStateChanged : arg0:" 
       + arg0); 
   if (arg0 == 2) { 
    Debug.infoByTag("meityitianViewPager", 
      "meityitianViewPager onPageScrollStateChanged direction left ? " 
        + left); 
    Debug.infoByTag("meityitianViewPager", 
      "meityitianViewPager onPageScrollStateChanged direction right ? " 
        + right); 
    //notify .... 
    if(changeViewCallback!=null){ 
     changeViewCallback.changeView(left, right); 
    } 
    right = left = false; 
   } 
  } 
  @Override 
  public void onPageScrolled(int arg0, float arg1, int arg2) { 
   if (isScrolling) { 
    if (lastValue > arg2) { 
     // 递减，向右侧滑动 
     right = true; 
     left = false; 
    } else if (lastValue < arg2) { 
     // 递减，向右侧滑动 
     right = false; 
     left = true; 
    } else if (lastValue == arg2) { 
     right = left = false; 
    } 
   } 
   Log.i("meityitianViewPager", 
     "meityitianViewPager onPageScrolled last :arg2 ," 
       + lastValue + ":" + arg2); 
   lastValue = arg2; 
  } 
  @Override 
  public void onPageSelected(int arg0) { 
   if(changeViewCallback!=null){ 
    changeViewCallback.getCurrentPageIndex(arg0); 
   } 
  } 
 }; 
  
 public boolean getMoveRight(){ 
  return right; 
 } 
  
 public boolean getMoveLeft(){ 
  return left; 
 } 
  
 public interface ChangeViewCallback{ 
   
  public void changeView(boolean left,boolean right); 
  public void getCurrentPageIndex(int index); 
 } 
  
 public void setChangeViewCallback(ChangeViewCallback callback){ 
  changeViewCallback = callback; 
 } 
}

希望本文所述对大家Android程序设计有所帮助。

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