之前在電商項目中用到廣告輪播的效果，在app端實現廣告圖片的上傳，然后輪播圖片，使用handler發送消息然后在handlemessage中在發消息的循環發送可以實現廣告輪播效果，但是當添加圖片以后，廣告輪播的速度變的不規律起來，異常的快，使用 scheduleWithFixedDelay發送消息也是如此，因此在朋友的推薦下使用第三方框架RollViewPager，摒棄安卓原生的viewpager，完美的實現了圖片的勻速規律輪播效果。https://github.com/Jude95/RollViewPager


布局文件</pre><pre style="font-family: Consolas; font-size: 14.3pt; background-color: rgb(255, 255, 255);"><pre name="code" class="html"><com.jude.rollviewpager.RollPagerViewandroid:id="@+id/roll_view_pager"android:layout_width="match_parent"android:layout_height="180dp"app:rollviewpager_play_delay="3000"/>MainActivity public class MainActivity extends AppCompatActivity {private RollPagerView mRollViewPager;private TestLoopAdapter mLoopAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mRollViewPager= (RollPagerView) findViewById(R.id.roll_view_pager);mRollViewPager.setPlayDelay(1000);mRollViewPager.setAdapter(mLoopAdapter = new TestLoopAdapter(mRollViewPager));mRollViewPager.setHintView(new IconHintView(this,R.drawable.point_focus,R.drawable.point_normal));}private class TestLoopAdapter extends LoopPagerAdapter{private int[] imgs = {R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,};private int count = imgs.length;public TestLoopAdapter(RollPagerView viewPager) {super(viewPager);}@Overridepublic View getView(ViewGroup container, int position) {ImageView view = new ImageView(container.getContext());view.setImageResource(imgs[position]);view.setScaleType(ImageView.ScaleType.CENTER_CROP);view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));return view;}@Overridepublic int getRealCount() {return count;}}private class TestNomalAdapter extends StaticPagerAdapter{private int[] imgs = {R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,};private int count = imgs.length;public void add(){Log.i("RollViewPager","Add");count++;if (count>imgs.length)count = imgs.length;notifyDataSetChanged();}public void minus(){Log.i("RollViewPager","Minus");count--;if (count<1)count=1;notifyDataSetChanged();}@Overridepublic View getView(ViewGroup container, int position) {ImageView view = new ImageView(container.getContext());view.setImageResource(imgs[position]);view.setScaleType(ImageView.ScaleType.CENTER_CROP);view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));return view;}@Overridepublic int getCount() {return count;}} }
補充：在使用過程中出現了向左滑動會出現空白頁面的現象，以及IllegalStateException的問題，經過嘗試找到了以下解決方法： LoopPagerAdapter中 @Overridepublic void destroyItem(ViewGroup container, int position, Object object) {//container.removeView((View) object);//注掉以后就不會出現空白頁面}@Overridepublic Object instantiateItem(ViewGroup container, int position) {int realPosition = position%getRealCount();View itemView = findViewByPosition(container,realPosition);<span style="color:#ff0000;"> ViewGroup p = (ViewGroup) itemView.getParent();<span style="white-space:pre"> </span>//防止出現IllegalStateException異常if (p != null) {p.removeView(itemView);}<span style="white-space:pre"> </span></span>container.addView(itemView);return itemView;}

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