利用MVC编写广告条轮播效果

<!--轮播图-->   <RelativeLayout     android:layout_width="match_parent"     android:layout_height="328px">      <android.support.v4.view.ViewPager       android:layout_width="match_parent"       android:layout_height="match_parent"       android:id="@+id/fragment_work_pic_viewpager"/>      <!-- 指针容器 -->      <RelativeLayout       android:background="@android:color/transparent"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:padding="5dp"       android:layout_alignBottom="@id/fragment_work_pic_viewpager">      <!--<TextView       android:textSize="12sp"       android:layout_gravity="left"       android:layout_marginLeft="5dp"       android:id="@+id/tv_desc"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:textColor="@android:color/white"       android:text="图片的描述"/>-->      <LinearLayout       android:layout_centerHorizontal="true"       android:layout_centerVertical="true"       android:id="@+id/ll_dots"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:orientation="horizontal">        </LinearLayout>     </RelativeLayout> 

package com.hanzheng.znxl.fragment;  import android.support.v4.view.ViewPager; import android.view.MotionEvent; import android.view.View; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RelativeLayout;  import com.hanzheng.znxl.R; import com.hanzheng.znxl.adapter.OnPagerChangeListenerImp; import com.hanzheng.znxl.adapter.WorkFragmentBannerAdapter; import com.hanzheng.znxl.base.BaseFragment; import com.hanzheng.znxl.base.MyApplication; import com.hanzheng.znxl.utils.ToastUtil;  import butterknife.Bind; import butterknife.ButterKnife; import butterknife.OnClick;  /**  * Created by zmybi on 29/12/2016.  */ public class WorkFragment extends BaseFragment {    @Bind(R.id.fragment_work_pic_viewpager)   ViewPager mFragmentWorkPicViewpager;   @Bind(R.id.ll_dots)   LinearLayout mLLDots; //  @Bind(R.id.tv_desc) //  TextView mTvDesc;   @Bind(R.id.ll_kaoqing)   LinearLayout mLlKaoqing;   @Bind(R.id.ll_execute)   LinearLayout mLlExecute;   @Bind(R.id.ll_daohang)   LinearLayout mLlDaohang;   @Bind(R.id.ll_sudden)   LinearLayout mLlSudden;   @Bind(R.id.ll_policething)   LinearLayout mLlPolicething;   @Bind(R.id.ll_collect)   LinearLayout mLlCollect;   @Bind(R.id.ll_search)   LinearLayout mLlSearch;   @Bind(R.id.ll_noticevoice)   LinearLayout mLlNoticevoice;   @Bind(R.id.iv_book)   ImageView mIvBook;   @Bind(R.id.rl_shouce)   RelativeLayout mRlShouce;   @Bind(R.id.ibtn_yuan)   ImageView mIbtnYuan;   @Bind(R.id.ibtn_helpbook)   ImageView mIbtnHelpbook;     private int[] imageResIds = {R.drawable.banner1,R.drawable.banner2};   private String[] descs = {"武汉保安集团","智能巡逻系统"};   private AutoScrollTask mAutoScrollTask;     @Override   public void initData() {     mFragmentWorkPicViewpager.addOnPageChangeListener(new OnPagerChangeListenerImp() {       @Override       public void onPageSelected(int position) {         changeDotAndDesc(position);       }     });     mFragmentWorkPicViewpager.setAdapter(new WorkFragmentBannerAdapter(imageResIds));     initDot();     changeDotAndDesc(0);  //默认选择第一页     mFragmentWorkPicViewpager.setCurrentItem(mFragmentWorkPicViewpager.getAdapter().getCount() / 2);      if(mAutoScrollTask == null) {       mAutoScrollTask = new AutoScrollTask();       mAutoScrollTask.start();     }     //按下去停止轮播     mFragmentWorkPicViewpager.setOnTouchListener(new View.OnTouchListener() {       @Override       public boolean onTouch(View view, MotionEvent motionEvent) {         switch (motionEvent.getAction()) {           case MotionEvent.ACTION_DOWN:           case MotionEvent.ACTION_MOVE:             mAutoScrollTask.stop();             break;           case MotionEvent.ACTION_UP:             mAutoScrollTask.start();             break;         }         return false;       }     });   }    private void changeDotAndDesc(int position) {     position = position % imageResIds.length; //    mTvDesc.setText(descs[position]);     for(int i = 0; i < mLLDots.getChildCount();i++) {       ImageView iv_dot = (ImageView) mLLDots.getChildAt(i);       iv_dot.setSelected(false);       if(position == i) {         iv_dot.setSelected(true);       }     }   }    private void initDot() {     for(int i = 0; i < imageResIds.length;i++) {       int _5dp = dp2px(5);       LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(_5dp,_5dp);       params.leftMargin = _5dp;       ImageView dot = new ImageView(mActivity);       dot.setLayoutParams(params);       dot.setBackgroundResource(R.drawable.selector_dot);       mLLDots.addView(dot);      }   }    public int dp2px(int dp) {     float density = getResources().getDisplayMetrics().density;     return (int) (dp * density + .5f);   }    @Override   public View initView() {     // TODO: inflate a fragment view     View rootView = View.inflate(mActivity,R.layout.fragment_work,null);     ButterKnife.bind(this, rootView);     return rootView;   }    @Override   public void onDestroyView() {     super.onDestroyView();     ButterKnife.unbind(this);   }    @OnClick({R.id.rl_shouce,R.id.ibtn_yuan, R.id.ibtn_helpbook,R.id.ll_kaoqing, R.id.ll_execute, R.id.ll_daohang, R.id.ll_sudden, R.id.ll_policething, R.id.ll_collect, R.id.ll_search, R.id.ll_noticevoice})   public void onClick(View view) {     switch (view.getId()) {       case R.id.ll_kaoqing:         ToastUtil.showToast(mActivity,"考勤");         break;       case R.id.ll_execute:         ToastUtil.showToast(mActivity,"勤务");         break;       case R.id.ll_daohang:         ToastUtil.showToast(mActivity,"网店");         break;       case R.id.ll_sudden:         ToastUtil.showToast(mActivity,"突发");         break;       case R.id.ll_policething:         ToastUtil.showToast(mActivity,"警情");         break;       case R.id.ll_collect:         ToastUtil.showToast(mActivity,"认证");         break;       case R.id.ll_search:         ToastUtil.showToast(mActivity,"信息查询");         break;       case R.id.ll_noticevoice:         ToastUtil.showToast(mActivity,"发布公告");         break;       case R.id.rl_shouce:         ToastUtil.showToast(mActivity,"手册");         break;       case R.id.ibtn_yuan:         ToastUtil.showToast(mActivity,"预案流程");         break;       case R.id.ibtn_helpbook:         ToastUtil.showToast(mActivity,"帮助手册");         break;      }   }    private class AutoScrollTask implements Runnable{     public void start() {       stop();       MyApplication.getMainThreadHandler().postDelayed(this,2000);     }      public void stop() {       MyApplication.getMainThreadHandler().removeCallbacks(this);     }      @Override     public void run() {       int currentItem = mFragmentWorkPicViewpager.getCurrentItem();       currentItem++;       mFragmentWorkPicViewpager.setCurrentItem(currentItem);       start();     }   } } 

package com.hanzheng.znxl.adapter;  import android.support.v4.view.PagerAdapter; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView;  /**  * Created by zmybi on 31/12/2016.  */  public class WorkFragmentBannerAdapter extends PagerAdapter {   private int[] imageResIds;   public WorkFragmentBannerAdapter(int[] imageResIds) {   this.imageResIds = imageResIds;  }   @Override  public int getCount() {   return imageResIds.length * 1000000;  }   @Override  public boolean isViewFromObject(View view, Object object) {   return view == object;  }   @Override  public Object instantiateItem(ViewGroup container, int position) {   ImageView iv = new ImageView(container.getContext());   position = position % imageResIds.length;   iv.setBackgroundResource(imageResIds[position]);   iv.setScaleType(ImageView.ScaleType.FIT_XY);   container.addView(iv);   return iv;  }   @Override  public void destroyItem(ViewGroup container, int position, Object object) {   container.removeView((ImageView)object);  } }