viewpager控制切换速度



1第一步：首先创建一个类继承Scroller

package com.front.adshow;

import android.content.Context;

import android.view.animation.Interpolator;

import android.widget.Scroller;

public class FixedSpeedScroller extends Scroller {

    private int mDuration = 1000;

    

    public FixedSpeedScroller(Context context) {

        super(context);

        // TODO Auto-generated constructor stub

    }

    

    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);

    }

    

    public void setmDuration(int time) {

        mDuration = time;

    }

    

    public int getmDuration() {

        return mDuration;

    }

    

}

2.第二步：在使用ViewPager的Activity中

viewPager = (ViewPager) findViewById(R.id.vp);

adapter = new MyPagerAdapter();

viewPager.setAdapter(adapter);

try {

    Field mField = ViewPager.class.getDeclaredField("mScroller");

    mField.setAccessible(true);

    mScroller = new FixedSpeedScroller(viewPager.getContext(),new AccelerateInterpolator());

    mField.set(viewPager, mScroller);

} catch (Exception e) {

    e.printStackTrace();

}

3.第三步：在控制ViewPager切换图片时，加入以下代码即可

viewPager.setCurrentItem(currentItem);

mScroller.setmDuration(2* 1000);

注意：2*1000表示切换过程是2秒，可以随意设置