Android BannerView通用封装详解

<declare-styleable name="NewBannerView">    <attr name="selectPoint" format="reference" />    <attr name="normalPoint" format="reference" />    <attr name="pointWidth" format="dimension" />    <attr name="switchTime" format="integer" />    <attr name="location">      <enum name="CENTER" value="0" />      <enum name="RIGHT" value="1" />    </attr>  </declare-styleable>

<com.goldou.lovesee.view.NewBannerView    android:id="@+id/bannerView"    android:layout_width="match_parent"    app:selectPoint="@drawable/red_point"    app:normalPoint="@drawable/gray_point"    app:switchTime="4000"    app:location="RIGHT"    android:layout_height="200dp" />

int[] imageList = {R.drawable.me_top, R.drawable.me_top, R.drawable.me_top, R.drawable.me_top};    NewBannerView bannerView = view.findViewById(R.id.bannerView);    bannerView.setImageData(imageList);    bannerView.start();    bannerView.setOnPageClickListener(new NewBannerView.OnPageClickListener() {      @Override      public void onPageClick(int position) {        Toast.makeText(getActivity(), position + "", Toast.LENGTH_SHORT).show();      }    });

public class NewBannerView extends RelativeLayout implements View.OnClickListener {  private Context context;  private int selectPoint, normalPoint;  private float pointWidth = 7;  private int location;  private int CENTER = 0, RIGHT = 1;  private int lastPosition = 0;  private ViewPager viewPager;  private int switchTime = 5000;  private int[] images;  private OnPageClickListener onPageClickListener;  private Handler handler = new Handler(new Handler.Callback() {    @Override    public boolean handleMessage(Message msg) {      if (msg.what == 101) {        viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);        start();      }      return false;    }  });  public NewBannerView(Context context) {    this(context, null);  }  public NewBannerView(Context context, AttributeSet attrs) {    this(context, attrs, 0);  }  public NewBannerView(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    this.context = context;    initAttr(attrs);  }  private void initAttr(AttributeSet attrs) {    TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.NewBannerView);    selectPoint = array.getResourceId(R.styleable.NewBannerView_selectPoint, R.mipmap.ic_launcher_round);    normalPoint = array.getResourceId(R.styleable.NewBannerView_normalPoint, R.mipmap.ic_launcher_round);    pointWidth = array.getDimension(R.styleable.NewBannerView_pointWidth, pointWidth);    location = array.getInteger(R.styleable.NewBannerView_location, RIGHT);    switchTime = array.getInteger(R.styleable.NewBannerView_switchTime, switchTime);    array.recycle();  }  public void setImageData(final int[] images) {    this.images = images;    final LinearLayout ll_point = new LinearLayout(context);    LayoutParams layoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);    layoutParams.addRule(ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);    layoutParams.bottomMargin = 20;    if (location == CENTER) {      layoutParams.addRule(CENTER_HORIZONTAL, RelativeLayout.TRUE);    } else {      layoutParams.addRule(ALIGN_PARENT_RIGHT, RelativeLayout.TRUE);      layoutParams.rightMargin = 20;    }    LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(UIUtil.dip2px(pointWidth), UIUtil.dip2px(pointWidth));    LinearLayout.LayoutParams params2 = new LinearLayout.LayoutParams(UIUtil.dip2px(pointWidth), UIUtil.dip2px(pointWidth));    params1.leftMargin = 0;    params2.leftMargin = UIUtil.dip2px(pointWidth);    for (int i = 0; i < images.length; i++) {      ImageView point = new ImageView(context);      if (i == 0) {        point.setBackgroundResource(selectPoint);        point.setLayoutParams(params1);      } else {        point.setBackgroundResource(normalPoint);        point.setLayoutParams(params2);      }      ll_point.addView(point);    }    viewPager = new ViewPager(context);    viewPager.setAdapter(new BannerAdapter());    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {      @Override      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {      }      @Override      public void onPageSelected(int position) {        position = position % images.length;        if (lastPosition == position) {          return;        }        ll_point.getChildAt(position).setBackgroundResource(selectPoint);        ll_point.getChildAt(lastPosition).setBackgroundResource(normalPoint);        lastPosition = position;      }      @Override      public void onPageScrollStateChanged(int state) {      }    });    LayoutParams layoutParams1 = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);    addView(viewPager, layoutParams1);    addView(ll_point, layoutParams);  }  public void start() {    handler.sendEmptyMessageDelayed(101, switchTime);  }  public void stop() {    handler.removeCallbacksAndMessages(null);  }  private int getCurrentItem() {    return viewPager.getCurrentItem() % images.length;  }  @Override  public void onClick(View view) {    onPageClickListener.onPageClick(getCurrentItem());  }  public interface OnPageClickListener {    void onPageClick(int position);  }  public void setOnPageClickListener(OnPageClickListener onPageClickListener) {    this.onPageClickListener = onPageClickListener;  }  private class BannerAdapter extends PagerAdapter {    @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, int position) {      position = position % images.length;      ImageView imageView = new ImageView(context);      imageView.setImageResource(images[position]);      imageView.setScaleType(ImageView.ScaleType.FIT_XY);      imageView.setOnClickListener(NewBannerView.this);      container.addView(imageView);      return imageView;    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {      container.removeView((View) object);    }  }}