自动轮播广告组件实现-优快云博客

本文介绍了一个基于Android平台的自动轮播广告组件实现方法，包括如何使用ViewPager进行页面切换，如何通过Handler定时触发页面更新，以及如何为每个广告项添加点击事件监听器。此外，还介绍了如何设置指示器来显示当前轮播的位置。

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public class Autopager extends LinearLayout {

    private ViewPager vp;
    private LinearLayout ll;
    private View inflate;
    private List<ImageView> image = new ArrayList<>();
    private int item = 0;
    private ImageView imageView;
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            vp.setCurrentItem(item);
        }
    };

    public Autopager(Context context) {
        this(context, null);
    }

    public Autopager(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public Autopager(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        inflate = View.inflate(context, R.layout.carousebj, this);
        init();
    }

    private void init() {
        vp = inflate.findViewById(R.id.vp);
        ll = findViewById(R.id.ll);
        jiadian();
        handler.sendEmptyMessage(5000);

        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                for (int i = 0; i < image.size(); i++) {
                    ImageView imageView = image.get(position % image.size());
                    if(position%image.size()==i){
                        imageView.setImageResource(R.drawable.bb);
                    }else{
                        image.get(i).setImageResource(R.drawable.aa);
                    }
                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }

    public void tim() {
        Log.e("chen", "tim: -------------"+"我自动轮播" );
        Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                ++item;
                handler.sendEmptyMessage(0);
            }
        }, 0, 5000);

//        ++item;
//        handler.sendEmptyMessageDelayed(1, 5000);
    }



    public void jiadian() {

        Log.e("chen", "jiadian: -------------"+"我添加原点" );
        //得到LinearLayout布局
        if(image!=null){
            image.clear();//清空图片集合
        }
        ll.removeAllViews();//清空LinearLayout布局
        for (int i=0;i<4;i++)//添加
        {
            //创建一个图片布局
            imageView = new ImageView(getContext());
            if(i==0)
            {
                imageView.setImageResource(R.drawable.bb);
                Log.e("chen", "jiadian: -------------"+"我是第一张" );
            }else{
                imageView.setImageResource(R.drawable.aa);
                Log.e("chen", "jiadian: -------------"+"我是第234张" );
            }
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(20, 20);//圆点大小
            image.add(imageView);//圆点添加到图片集合中
            ll.addView(imageView,layoutParams);//圆点添加到LinearLayout中
            Log.e("chen", "jiadian: -------------"+"我已经添加了" );
        }


    }
    public void setadap(cpspq pp) {
        vp.setAdapter(pp);
    }


}

//适配器

public class cpspq extends PagerAdapter{

    private Context context;
    private ArrayList<tu> arr;
    private Myurl dizhi;

    public cpspq(Context context, ArrayList<tu> arr,Myurl dizhi) {
        this.context = context;
        this.arr = arr;
        this.dizhi=dizhi;
    }


    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Object instantiateItem(ViewGroup container, final int position) {
        ImageView imageView = new ImageView(context);
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
//        imageView.setImageResource(R.mipmap.ic_launcher);
//        Log.e("qweqwe","wqewqe"+arr.get(position).toString());
        ImageLoader.getInstance().displayImage(arr.get(position%arr.size()).getTu(),imageView);
        container.addView(imageView);
        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            dizhi.Jiekou(position%arr.size());
                Log.e("chen", "onClick: ========"+position%arr.size() );

            }
        });

        return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }
}

//Main请求网络

public class MainActivity extends AppCompatActivity implements Myurl {

    ArrayList<tu> tuarr = new ArrayList<>();
    private Autopager chenxu;
    private ViewPager vv;
    private List<ImageView> image = new ArrayList<>();
    private LinearLayout ll;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new MAsyncTask().execute("http://120.27.23.105/ad/getAd");

        vv = (ViewPager) findViewById(R.id.vp);
        ll = (LinearLayout) findViewById(R.id.ll);
        chenxu = (Autopager) findViewById(R.id.chenxu);
//        chenxu.setadap(new cpspq(MainActivity.this,tuarr));
        chenxu.tim();
//        chenxu.jiadian();

//        vv.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
//            @Override
//            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
//                for (int i = 0; i < tuarr.size(); i++) {
//                    ImageView imageView = ivList1.get(position % tuarr.size());
//                    if(position%ivList1.size()==i){
//                        imageView.setImageResource(R.drawable.bb);
//                    }else{
//                        ivList1.get(i).setImageResource(R.drawable.aa);
//                    }
//                }
//            }
//
//            @Override
//            public void onPageSelected(int position) {
//
//            }
//
//            @Override
//            public void onPageScrollStateChanged(int state) {
//
//            }
//        });

    }

    @Override
    public void Jiekou(int oo) {
        String lj = tuarr.get(oo).getLj();
        Log.e("chen", "Jiekou: " + "我要跳转了" + lj);
        if (oo == 3) {
            Toast.makeText(MainActivity.this, "我要跳转了", Toast.LENGTH_SHORT).show();
        } else {
            Intent intent = new Intent(MainActivity.this, Main2Activity.class);
            intent.putExtra("dz", lj);
            startActivity(intent);
        }

    }


    class MAsyncTask extends AsyncTask<String, Void, String> {
        //这个是请求网络之前的调用的方法,也是最先调用的方法,可以初始化一些ui等;这个方法是在主线程里运行的
//可以不写
        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }

        @Override
        protected String doInBackground(String... strings) {
            StringBuilder stringBuilder = new StringBuilder();
            String s = "";
            try {
//拼接字符串,拼接完成之后进行返回
                URL url = new URL(strings[0]);
                URLConnection urlConnection = url.openConnection();
                InputStream inputStream = urlConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

                while ((s = bufferedReader.readLine()) != null) {
                    stringBuilder.append(s);
                }
                String pjsj = stringBuilder.toString();
                Log.e("chen", "doInBackground: 拼接的内容" + pjsj);
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return stringBuilder.toString();
        }


        @Override
        protected void onPostExecute(String s) {
//连接适配器
            super.onPostExecute(s);
            Gson gson = new Gson();
            jiexibean jiexibean = gson.fromJson(s, jiexibean.class);
            List<com.example.zhoukaomoni.jiexibean.DataBean> data = jiexibean.getData();
            for (int i = 0; i < data.size(); i++) {
                String icon = data.get(i).getIcon();
                String url = data.get(i).getUrl();
                tuarr.add(new tu(icon, url));
            }
            chenxu.setadap(new cpspq(MainActivity.this, tuarr, MainActivity.this));
            Log.e("chen", "onPostExecute: " + tuarr);

        }
    }
}