How to judge the left and right sliding direction in Android programming

Updated: October 27, 2015 15:22:45 Author: Piaoxue Lingfeng

This article mainly introduces the method of viewPage to judge the left and right sliding directions in Android programming, and involves the relevant techniques of viewPage for sliding judgment in Android. It is very simple and practical. Friends who need it can refer to it.

This article describes the method of ViewPage judging the left and right sliding directions in Android programming. Share it for your reference, as follows:

package ;
import ; 
import .; 
import ; 
import ; 
import ; 
/**
  * Rewrite, added a method to determine the sliding direction
  * @author zxy
  *
  */ 
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(); 
 } 
 /** 
  * init method . 
*/ 
 private void init() { 
  setOnPageChangeListener(listener); 
 } 
 /** 
  * listener ,to get move direction . 
*/ 
 public OnPageChangeListener listener = new OnPageChangeListener() { 
  @Override 
  public void onPageScrollStateChanged(int arg0) { 
   if (arg0 == 1) { 
    isScrolling = true; 
   } else { 
    isScrolling = false; 
   } 
   ("meityitianViewPager", 
     "meityitianViewPager onPageScrollStateChanged : arg0:" 
       + arg0); 
   if (arg0 == 2) { 
    ("meityitianViewPager", 
      "meityitianViewPager onPageScrollStateChanged direction left ? " 
        + left); 
    ("meityitianViewPager", 
      "meityitianViewPager onPageScrollStateChanged direction right ? " 
        + right); 
    //notify .... 
    if(changeViewCallback!=null){ 
     (left, right); 
    } 
    right = left = false; 
   } 
  } 
  @Override 
  public void onPageScrolled(int arg0, float arg1, int arg2) { 
   if (isScrolling) { 
    if (lastValue &gt; arg2) { 
     // Decrease, slide to the right     right = true; 
     left = false; 
    } else if (lastValue &lt; arg2) { 
     // Decrease, slide to the right     right = false; 
     left = true; 
    } else if (lastValue == arg2) { 
     right = left = false; 
    } 
   } 
   ("meityitianViewPager", 
     "meityitianViewPager onPageScrolled last :arg2 ," 
       + lastValue + ":" + arg2); 
   lastValue = arg2; 
  } 
  @Override 
  public void onPageSelected(int arg0) { 
   if(changeViewCallback!=null){ 
    (arg0); 
   } 
  } 
 }; 
 /**
   * Get whether to slide to the right
   * @return true Swipe right
 */ 
 public boolean getMoveRight(){ 
  return right; 
 } 
 /**
   * Get whether to slide to the left
   * @return true Slide for left
 */ 
 public boolean getMoveLeft(){ 
  return left; 
 } 
 /**
   * Sliding state changes callback
   * @author zxy
   *
 */ 
 public interface ChangeViewCallback{ 
  /**
    * Switch view?  Depends on left and right. 
    * @param left
    * @param right
 */ 
  public void changeView(boolean left,boolean right); 
  public void getCurrentPageIndex(int index); 
 } 
 /** 
  * set ... 
  * @param callback 
*/ 
 public void setChangeViewCallback(ChangeViewCallback callback){ 
  changeViewCallback = callback; 
 } 
}

I hope this article will be helpful to everyone's Android programming design.

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How to judge the left and right sliding direction in Android programming

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