ViewPager的无限轮播，和shape的小圆点使用，及webview显示进度条

   viewpager中的图片是url的话，

for (int i=0;i<banner.size();i++){    String img = banner.get(i).getImg();    String url = banner.get(i).getUrl();    list_url.add(url);    ImageView image=new ImageView(MainActivity.this);//    Picasso.with(MainActivity.this).load(img).into(image);//    list_image.add(image);//这三个方法，就直接添加到集合； ImageView image1=new ImageView(MainActivity.this);    image1.setImageResource(R.drawable.sector_dra);     list_image1.add(image1);     line.addView(image1);       image1.setPadding(10,0,10,0);}

viewpager的无限轮播使用，首先你要先弄适配器：重写四个方法：

 class myadpter extends PagerAdapter{        @Override        public int getCount() {            return Integer.MAX_VALUE;//返回最大值，说明集合中图片的最大值！        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view==object;        }        @Override        public Object instantiateItem(ViewGroup container, final int position) {   //如果只有两张图片的话，就必须抛个异常，因为图片太少
 
ImageView  imageView = list_image.get(position%list_image.size());        try {            container.addView(imageView);            return imageView;        }catch (Exception e){        }            imageView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                   Intent intent=new Intent(MainActivity.this,Next.class);                    intent.putExtra("position",position%list_image.size());                    intent.putStringArrayListExtra("list", (ArrayList<String>) list_url);                    startActivity(intent);                }            });        return imageView;    }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {
  //如果只有两张图片，就不需要在这里写方法；
 //            ImageView imageView = list_image.get(position%list_image.size());//            container.removeView(imageView);        }    }

无限轮播需要在主线程发送：

h1.sendEmptyMessageDelayed(0,1000);

然后再

android.os.Handler h1=new android.os.Handler(){//记住导os包    @Override    public void handleMessage(Message msg) {        if(msg.what==0)        {            int currentItem = viewpager.getCurrentItem();            currentItem++;            viewpager.setCurrentItem(currentItem);            h1.sendEmptyMessageDelayed(0,1000);        }        super.handleMessage(msg);    }};对于shape的使用在res下drawable 里建一个shape：
<shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval"    ><size    android:height="10dp"    android:width="10dp"    ></size>    <solid        android:color="#fff"        ></solid></shape>
然后再建一个selector
<selector xmlns:android="http://schemas.android.com/apk/res/android"    ><item    android:state_selected="true"    android:drawable="@drawable/shape_true"    ></item>    <item        android:state_selected="false"        android:drawable="@drawable/shape_false"        ></item></selector>

webview里显示进度条：
webview.setWebChromeClient(new WebChromeClient() {    @Override    public void onProgressChanged(WebView view, int newProgress) {        if (newProgress == 100) {            // 加载完毕            closeDialog(newProgress);        } else {            openDialog(newProgress);        }        super.onProgressChanged(view, newProgress);    }    private void openDialog(int newProgress) {        if (dialog == null) {            dialog = new ProgressDialog(Next.this);            dialog.setTitle("正在加载");            dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);            dialog.setProgress(newProgress);            dialog.show();        } else {            dialog.setProgress(newProgress);        }    }    private void closeDialog(int newProgress) {        if (dialog != null && dialog.isShowing()) {            dialog.dismiss();            dialog = null;        }    }});