android ViewPager在拖拽到左边和右边的时候，禁止显示黄色或者蓝色的渐变图片的解决方法

直接上代码：

<span style="font-size:18px;">package com.example.viewpagertest;import java.lang.reflect.Field;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.support.v4.widget.EdgeEffectCompat;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;public class MainActivity extends Activity implements OnPageChangeListener {private ViewPager viewpager;private List<ImageView> views;private EdgeEffectCompat leftEdge;private EdgeEffectCompat rightEdge;private int[] ids = {R.drawable.iframe_4,R.drawable.iframe_5,R.drawable.iframe_6,R.drawable.iframe_7,R.drawable.iframe_8};private MyAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {viewpager = (ViewPager) findViewById(R.id.viewpager);initViewPager();initData();}private void initData() {views = new ArrayList<ImageView>();for(int i=0;i<ids.length;i++){ImageView iv = new ImageView(this);iv.setImageResource(ids[i]);views.add(iv);}adapter = new MyAdapter();viewpager.setAdapter(adapter);viewpager.setOnPageChangeListener(this);}class MyAdapter extends PagerAdapter{@Overridepublic int getCount() {return views.size();}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0==arg1;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {((ViewPager)container).removeView(views.get(position));}@Overridepublic Object instantiateItem(ViewGroup container, int position) {((ViewPager)container).addView(views.get(position));return views.get(position);}}@Overridepublic void onPageScrollStateChanged(int arg0) {}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {if (leftEdge != null && rightEdge != null) {leftEdge.finish();rightEdge.finish();leftEdge.setSize(0, 0);rightEdge.setSize(0, 0);}}@Overridepublic void onPageSelected(int arg0) {}private void initViewPager() {try {Field leftEdgeField = viewpager.getClass().getDeclaredField("mLeftEdge");Field rightEdgeField = viewpager.getClass().getDeclaredField("mRightEdge");if (leftEdgeField != null && rightEdgeField != null) {leftEdgeField.setAccessible(true);rightEdgeField.setAccessible(true);leftEdge = (EdgeEffectCompat) leftEdgeField.get(viewpager);rightEdge = (EdgeEffectCompat) rightEdgeField.get(viewpager);}} catch (Exception e) {e.printStackTrace();}}}</span>