用ViewPager实现广告栏

publicclass AdPagerMainActivity extendsActionBarActivity {

     

    privateImageView mDefaultImage = null;

     

    privateViewPager mImagePager = null;

     

    privateImageView[] mImageViews = null;

     

    privateAtomicInteger what = newAtomicInteger(0);

     

    privateboolean isContinue = true;

     

    privateList<view> advPics;

     

    privateContext mContext;

     

    privateImageView mImageView;

     

    @Override

    protectedvoid onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.layout_ad_pager);

        init();

        initView();

        initViewPager();

    }

     

    /**

     * 初始化数据

     */

    privatevoid init() {

        mContext = this;

        advPics = newArrayList<view>();

    }

     

    /**

     * 初始化控件

     */

    privatevoid initView() {

        // TODO Auto-generated method stub

        mDefaultImage = (ImageView) findViewById(R.id.home_default_image);

        mImagePager = (ViewPager) findViewById(R.id.adv_pager);

    }

     

    /**

     * void

     */

    privatevoid initViewPager() {

        // TODO Auto-generated method stub

        mDefaultImage.setVisibility(View.GONE);

        mImagePager.setVisibility(View.VISIBLE);

         

        ImageView img1 = newImageView(mContext);

        img1.setBackgroundResource(R.drawable.img1);

        advPics.add(img1);

         

        ImageView img2 = newImageView(mContext);

        img2.setBackgroundResource(R.drawable.img2);

        advPics.add(img2);

         

        ImageView img3 = newImageView(mContext);

        img3.setBackgroundResource(R.drawable.img3);

        advPics.add(img3);

         

        ImageView img4 = newImageView(mContext);

        img4.setBackgroundResource(R.drawable.img4);

        advPics.add(img4);

         

        // group是R.layou.mainview中的负责包裹小圆点的LinearLayout.

        ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);

        mImageViews = newImageView[advPics.size()];

        LinearLayout.LayoutParams layoutParams = newLinearLayout.LayoutParams(13,13);

        layoutParams.setMargins(5,0,5,1);

         

        for(inti = 0; i < advPics.size(); i++) {

            mImageView = newImageView(this);

            mImageView.setLayoutParams(layoutParams);

            mImageViews[i] = mImageView;

            if(i == 0) {

                // 默认选中第一张图片

                mImageViews[i].setBackgroundResource(R.drawable.item_focus);

            }

            else{

                mImageViews[i].setBackgroundResource(R.drawable.item_unfocus);

            }

            group.addView(mImageViews[i]);

        }

         

        mImagePager.setAdapter(newAdvAdapter(advPics));

        mImagePager.setOnPageChangeListener(newGuidePageChangeListener());

        // 按下时不继续定时滑动,弹起时继续定时滑动

        mImagePager.setOnTouchListener(newView.OnTouchListener() {

             

            @Override

            publicboolean onTouch(View v, MotionEvent event) {

                switch(event.getAction()) {

                    caseMotionEvent.ACTION_DOWN:

                    caseMotionEvent.ACTION_MOVE:

                        isContinue = false;

                        break;

                    caseMotionEvent.ACTION_UP:

                        isContinue = true;

                        break;

                    default:

                        isContinue = true;

                        break;

                }

                returnfalse;

            }

        });

        // 定时滑动线程

        newThread(newRunnable() {

             

            @Override

            publicvoid run() {

                while(true) {

                    if(isContinue) {

                        viewHandler.sendEmptyMessage(what.get());

                        whatOption();

                    }

                }

            }

             

        }).start();

    }

     

    /**

     * 操作圆点轮换变背景

     */

    privatevoid whatOption() {

        what.incrementAndGet();

        if(what.get() > mImageViews.length - 1) {

            what.getAndAdd(-mImageViews.length);

        }

        try{

            if(what.get() == 1) {

                Thread.sleep(3000);

            }

            else{

                Thread.sleep(2000);

            }

        }

        catch(InterruptedException e) {

        }

    }

     

    /**

     * 处理定时切换广告栏图片的句柄

     */

    @SuppressLint(HandlerLeak)

    privatefinal Handler viewHandler = newHandler() {

         

        @Override

        publicvoid handleMessage(Message msg) {

            mImagePager.setCurrentItem(msg.what);

            super.handleMessage(msg);

        }

    };

     

    /** 指引页面改监听器 */

    privatefinal class GuidePageChangeListener implementsOnPageChangeListener {

         

        @Override

        publicvoid onPageScrollStateChanged(intarg0) {

             

        }

         

        @Override

        publicvoid onPageScrolled(intarg0, floatarg1, intarg2) {

             

        }

         

        @Override

        publicvoid onPageSelected(intarg0) {

            arg0 = arg0 % advPics.size();

            for(inti = 0; i < mImageViews.length; i++) {

                mImageViews[arg0].setBackgroundResource(R.drawable.item_focus);

                if(arg0 != i) {

                    mImageViews[i].setBackgroundResource(R.drawable.item_unfocus);

                }

            }

            what.set(arg0);

        }

    }

     

    /**

     * @Description: 广告栏PaperView 图片适配器

     */

    privatefinal class AdvAdapter extendsPagerAdapter {

        privateList<view> views = null;

         

        publicAdvAdapter(List<view> views) {

            this.views = views;

        }

         

        @Override

        publicvoid destroyItem(View arg0, intarg1, Object arg2) {

            ((ViewPager) arg0).removeView(views.get(arg1));

        }

         

        @Override

        publicvoid finishUpdate(View arg0) {

             

        }

         

        @Override

        publicint getCount() {

            returnviews.size();

        }

         

        @Override

        publicObject instantiateItem(View arg0, intarg1) {

            ((ViewPager) arg0).addView(views.get(arg1), 0);

            returnviews.get(arg1);

        }

         

        @Override

        publicboolean isViewFromObject(View arg0, Object arg1) {

            returnarg0 == arg1;

        }

         

        @Override

        publicvoid restoreState(Parcelable arg0, ClassLoader arg1) {

             

        }

         

        @Override

        publicParcelable saveState() {

            returnnull;

        }

         

        @Override

        publicvoid startUpdate(View arg0) {

             

        }

    }

}