Android 自定义Viewpager滑动速度

由于Viewpager的滑动速度是固定的，所以很蛋疼。看了老外的文章可以利用反射机制，修改Viewpager的滑动速度。下面是代码实现：

 

需要新建个类FixedSpeedScoller继承自scroller类

import android.content.Context;
import android.view.animation.Interpolator;
import android.widget.Scroller;

/**
 * FixedSpeedScroller for controlling sliding animation speed. It uses the java
 * reflection mechanism.
 * 
 * @version 1.00 2014.1.6
 * @author Huang.xin gkx100120
 * 
 */
public class FixedSpeedScroller extends Scroller {

    private int mDuration = 1500; // default time is 1500ms

    public FixedSpeedScroller(Context context) {
	super(context);
    }

    public FixedSpeedScroller(Context context, Interpolator interpolator) {
	super(context, interpolator);
    }

    @Override
    public void startScroll(int startX, int startY, int dx, int dy, int duration) {
	// Ignore received duration, use fixed one instead
	super.startScroll(startX, startY, dx, dy, mDuration);
    }

    @Override
    public void startScroll(int startX, int startY, int dx, int dy) {
	// Ignore received duration, use fixed one instead
	super.startScroll(startX, startY, dx, dy, mDuration);
    }

    /**
     * set animation time
     * 
     * @param time
     */
    public void setmDuration(int time) {
	mDuration = time;
    }

    /**
     * get current animation time
     * 
     * @return
     */
    public int getmDuration() {
	return mDuration;
    }
}

然后需要在初始化Viewpager的地方，加入以下代码：

 FixedSpeedScroller mScroller = null;
 private void controlViewPagerSpeed() {
	try {
	    Field mField;

	    mField = ViewPager.class.getDeclaredField("mScroller");
	    mField.setAccessible(true);

	    mScroller = new FixedSpeedScroller(
		    mMainHolder.main_viewpager.getContext(),
		    new AccelerateInterpolator());
	    mScroller.setmDuration(2000); // 2000ms
	    mField.set(mMainHolder.main_viewpager, mScroller);
	} catch (Exception e) {
	    e.printStackTrace();
	}
    }

setmDuration 可以设定想要的时间。