android控件实现多张图片渐变切换

public class Gradient extends RelativeLayout {  private List<ImageView> imageViews;  private List<Animation> outAnim;//淡出动画  private List<Animation> inAnim;//淡入动画  private Context mContext;  private Handler handler = new Handler(Looper.getMainLooper());  private int couot;  private int currentIndex;//当前的页面  private LinearLayout linearLayout;  private onClickListner listner;  private long time=3000;//动画间隔时间  public Gradient(Context context) {    this(context, null);  }  public Gradient(Context context, AttributeSet attrs) {    super(context, attrs);    this.mContext = context;  }  /**   * 画点   */  public void cratePoint() {    if (null != imageViews && imageViews.size() > 0) {      int size = imageViews.size();      linearLayout = new LinearLayout(mContext);      linearLayout.setOrientation(LinearLayout.HORIZONTAL);      linearLayout.setGravity(Gravity.CENTER);      // 添加图片      for (int i = 0; i < size; i++) {        // 设置圆点        View viewPoint = new View(mContext);        viewPoint.setBackgroundResource(R.drawable.point_background);        int weight = dip2px(mContext, 5);        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(weight, weight);        lp.leftMargin = weight;        viewPoint.setLayoutParams(lp);        viewPoint.setEnabled(false);        linearLayout.addView(viewPoint);      }      View childAt = linearLayout.getChildAt(0);      if (null != childAt) {        childAt.setEnabled(true);      }      //添加到图片的下边      RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(-1,-2);      rlp.bottomMargin = dip2px(mContext, 5);      rlp.addRule(ALIGN_PARENT_BOTTOM);      this.addView(linearLayout, rlp);    }  }  /**   * 根据手机的分辨率从 dip 的单位 转成为 px(像素)   */  public static int dip2px(Context context, float dpValue) {    final float scale = context.getResources().getDisplayMetrics().density;    return (int) (dpValue * scale + 0.5f);  }  /**   * 设置图片   * @param imageViews   */  public void setImageViews(List<ImageView> imageViews) {    this.imageViews = imageViews;    for (int i = 0; i < imageViews.size(); i++) {      RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(-1,-1);      addView(imageViews.get(i),layoutParams);    }    setonClick();    cratePoint();    createAnim();    start();  }  /**   * 开启动画   */  private void start() {    final int size = imageViews.size();    handler.post(new Runnable() {      @Override      public void run() {        final int i = couot % size;        //解决点击事件的冲突        for (int j = 0; j < size; j++) {          if (j == i) {            imageViews.get(i).setClickable(true);          } else {            imageViews.get(i).setClickable(false);          }        }        if (couot < size) {          if (i == size - 1) {            ImageView imageView = imageViews.get(0);            imageView.startAnimation(outAnim.get(0));            ImageView imageView2 = imageViews.get(size - 1);            imageView2.startAnimation(inAnim.get(size - 1));          } else {            //当前的淡出,下一张淡入            ImageView imageView = imageViews.get(size - 1 - i);            imageView.startAnimation(outAnim.get(size - 1 - i));          }        } else {          if (i == size - 1) {            //当显示到最后一张的时候,要跳到第一张            ImageView imageView = imageViews.get(0);            imageView.startAnimation(outAnim.get(0));            ImageView imageView2 = imageViews.get(size - 1);            imageView2.startAnimation(inAnim.get(size - 1));          } else {            //当前的淡出,下一张淡入            ImageView imageView = imageViews.get(size - 1 - i);            imageView.startAnimation(outAnim.get(size - 1 - i));            ImageView imageView2 = imageViews.get(size - 2 - i);            imageView2.startAnimation(inAnim.get(size - 2 - i));          }        }        currentIndex = i;        linearLayout.getChildAt(currentIndex % size).setEnabled(false);        currentIndex++;        linearLayout.getChildAt(currentIndex % size).setEnabled(true);        couot++;        handler.postDelayed(this, time);      }    });  }  /**   * 创建动画   */  private void createAnim() {    outAnim = new ArrayList<>();    inAnim = new ArrayList<>();    for (int i = 0; i < imageViews.size(); i++) {      Animation zoomOutAwayAnim = createZoomOutAwayAnim();      zoomOutAwayAnim.setFillAfter(true);      outAnim.add(zoomOutAwayAnim);      Animation zoomOutNearAnim = createZoomOutNearAnim();      zoomOutNearAnim.setFillAfter(true);      inAnim.add(zoomOutNearAnim);    }  }  /**   * 设置点击事件   */  public void setonClick() {    for (int i = 0; i < imageViews.size(); i++) {      imageViews.get(i).setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {          if (listner != null) {            listner.setonClick((currentIndex) % imageViews.size());          }        }      });    }  }  public interface onClickListner{    void setonClick(int position);  }  /**   * 设置动画播放和handler延迟时间   * @param time   */  public void setTime(long time) {    this.time = time;  }  public void setListner(onClickListner listner) {    this.listner = listner;  }  /** 创建一个淡出缩小的动画 */  public Animation createZoomOutAwayAnim() {    AnimationSet ret;    Animation anim;    ret = new AnimationSet(false);    // 创建一个淡出的动画    anim = new AlphaAnimation(1f, 0f);    anim.setDuration(time);    anim.setInterpolator(new DecelerateInterpolator());    ret.addAnimation(anim);    // 创建一个缩小的动画    /*anim = new ScaleAnimation(1, 0, 1, 0, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);    anim.setDuration(MEDIUM);    anim.setInterpolator(new DecelerateInterpolator());    ret.addAnimation(anim);*/    return ret;  }  /** 创建一个淡入缩小的动画 */  public Animation createZoomOutNearAnim() {    AnimationSet ret;    Animation anim;    ret = new AnimationSet(false);    // 创建一个淡入的动画    anim = new AlphaAnimation(0f, 1f);    anim.setDuration(time);    anim.setInterpolator(new LinearInterpolator());    ret.addAnimation(anim);    // 创建一个缩小的动画    /*anim = new ScaleAnimation(3, 1, 3, 1, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);    anim.setDuration(MEDIUM);    anim.setInterpolator(new DecelerateInterpolator());    ret.addAnimation(anim);*/    return ret;  }}