Android自定义渐变式炫酷ListView下拉刷新动画

 private Bitmap initialBitmap; private float mCurrentProgress; private Bitmap scaledBitmap; public ibuRefreshFirstStepView(Context context, AttributeSet attrs,         int defStyle) {  super(context, attrs, defStyle);  init(context); } public ibuRefreshFirstStepView(Context context, AttributeSet attrs) {  super(context, attrs);  init(context); } public ibuRefreshFirstStepView(Context context) {  super(context);  init(context); } private void init(Context context) {  //这个就是那个火箭图片  initialBitmap = Bitmap.createBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.img_huojian1)); } /**  * 重写onMeasure方法主要是设置wrap_content时 View的大小  * @param widthMeasureSpec  * @param heightMeasureSpec  */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  //根据设置的宽度来计算高度 设置为符合第二阶段娃娃图片的宽高比例  setMeasuredDimension(measureWidth(widthMeasureSpec),measureWidth(widthMeasureSpec)*initialBitmap.getHeight()/initialBitmap.getWidth()); } /**  * 当wrap_content的时候，宽度即为第二阶段娃娃图片的宽度  * @param widMeasureSpec  * @return  */ private int measureWidth(int widMeasureSpec){  int result = 0;  int size = MeasureSpec.getSize(widMeasureSpec);  int mode = MeasureSpec.getMode(widMeasureSpec);  if (mode == MeasureSpec.EXACTLY){   result = size;  }else{   result = initialBitmap.getWidth();   if (mode == MeasureSpec.AT_MOST){    result = Math.min(result,size);   }  }  return result;  } /**  * 在onLayout里面获得测量后View的宽高  * @param changed  * @param left  * @param top  * @param right  * @param bottom  */ @Override protected void onLayout(boolean changed, int left, int top, int right,   int bottom) {  super.onLayout(changed, left, top, right, bottom);  // 给火箭图片进行等比例的缩放  scaledBitmap = Bitmap.createScaledBitmap(initialBitmap,89,110, false); } @Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  //这个方法是对画布进行缩放，从而达到椭圆形图片的缩放，第一个参数为宽度缩放比例，第二个参数为高度缩放比例，//  canvas.scale(mCurrentProgress, mCurrentProgress, measuredWidth/2, measuredHeight/2);  //将等比例缩放后的椭圆形画在画布上面  canvas.drawBitmap(scaledBitmap,90,dip2px(getContext(),80*mCurrentProgress),null); } /**  * 根据手机的分辨率从 dp 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); } /**  * 设置缩放比例，从0到1 0为最小 1为最大  * @param currentProgress  */ public void setCurrentProgress(float currentProgress){  mCurrentProgress = currentProgress; }}

 private Bitmap endBitmap,scaledBitmap; public ibuRefreshSecondStepView(Context context, AttributeSet attrs,         int defStyle) {  super(context, attrs, defStyle);  init(); } public ibuRefreshSecondStepView(Context context, AttributeSet attrs) {  super(context, attrs);  init(); } public ibuRefreshSecondStepView(Context context) {  super(context);  init(); } private void init() {  endBitmap = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.img_huojian2), 89, 110, false); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  setMeasuredDimension(measureWidth(widthMeasureSpec), measureWidth(widthMeasureSpec) * endBitmap.getHeight() / endBitmap.getWidth()); } @Override protected void onLayout(boolean changed, int left, int top, int right,       int bottom) {  super.onLayout(changed, left, top, right, bottom);  scaledBitmap = Bitmap.createScaledBitmap(endBitmap, 89, 110, false); } @Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  canvas.drawBitmap(endBitmap, 90, dip2px(getContext(), 80 * 1), null); } /**  * 根据手机的分辨率从 dp 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); } private int measureWidth(int widthMeasureSpec){  int result = 0;  int size = MeasureSpec.getSize(widthMeasureSpec);  int mode = MeasureSpec.getMode(widthMeasureSpec);  if (mode == MeasureSpec.EXACTLY) {   result = size;  }else {   result = endBitmap.getWidth();   if (mode == MeasureSpec.AT_MOST) {    result = Math.min(result, size);   }  }  return result; }}

 private Bitmap endBitmap,scaledBitmap; public ibuRefreshThirdStepView(Context context, AttributeSet attrs,         int defStyle) {  super(context, attrs, defStyle);  init(); } public ibuRefreshThirdStepView(Context context, AttributeSet attrs) {  super(context, attrs);  init(); } public ibuRefreshThirdStepView(Context context) {  super(context);  init(); } private void init() {  endBitmap = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.img_huojian3), 89, 170, false); } @Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  canvas.drawBitmap(endBitmap, 90, dip2px(getContext(), 40 * 1), null); } /**  * 根据手机的分辨率从 dp 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); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  setMeasuredDimension(measureWidth(widthMeasureSpec), measureWidth(widthMeasureSpec)*endBitmap.getHeight()/endBitmap.getWidth()); } private int measureWidth(int widthMeasureSpec){  int result = 0;  int size = MeasureSpec.getSize(widthMeasureSpec);  int mode = MeasureSpec.getMode(widthMeasureSpec);  if (mode == MeasureSpec.EXACTLY) {   result = size;  }else {   result = endBitmap.getWidth();   if (mode == MeasureSpec.AT_MOST) {    result = Math.min(result, size);   }  }  return result; }

 private static final int DONE = 0; private static final int PULL_TO_REFRESH = 1; private static final int RELEASE_TO_REFRESH = 2; private static final int REFRESHING = 3; private static final int RATIO = 3; private RelativeLayout headerView; private int headerViewHeight; private float startY; private float offsetY; private TextView tv_pull_to_refresh; private OnMeiTuanRefreshListener mOnRefreshListener; private int state; private int mFirstVisibleItem; private boolean isRecord; private boolean isEnd; private boolean isRefreable; private FrameLayout mAnimContainer;// private Animation animation; private SimpleDateFormat format; private ibuRefreshFirstStepView mFirstView; private ibuRefreshSecondStepView mSecondView; private AnimationDrawable secondAnim; private ibuRefreshThirdStepView mThirdView; private AnimationDrawable thirdAnim; public IbuListView(Context context) {  super(context);  init(context); } public IbuListView(Context context, AttributeSet attrs) {  super(context, attrs);  init(context); } public IbuListView(Context context, AttributeSet attrs, int defStyleAttr) {  super(context, attrs, defStyleAttr);  init(context); } public interface OnMeiTuanRefreshListener{  void onRefresh(); } /**  * 回调接口，想实现下拉刷新的listview实现此接口  * @param onRefreshListener  */ public void setOnMeiTuanRefreshListener(OnMeiTuanRefreshListener onRefreshListener){  mOnRefreshListener = onRefreshListener;  isRefreable = true; } /**  * 刷新完毕，从主线程发送过来，并且改变headerView的状态和文字动画信息  */ public void setOnRefreshComplete(){  //一定要将isEnd设置为true，以便于下次的下拉刷新  isEnd = true;  state = DONE;  changeHeaderByState(state); } private ImageView imageViewBack,imageView_B; private void init(Context context) {  setOverScrollMode(View.OVER_SCROLL_NEVER);  setOnScrollListener(this);  headerView = (RelativeLayout) LayoutInflater.from(context).inflate(R.layout.ibu_item, null, false);  imageViewBack= (ImageView) headerView.findViewById(R.id.icon_back);  imageView_B= (ImageView) headerView.findViewById(R.id.image_b);  mFirstView = (ibuRefreshFirstStepView) headerView.findViewById(R.id.first_view);  tv_pull_to_refresh = (TextView) headerView.findViewById(R.id.tv_pull_to_refresh);  mSecondView = (ibuRefreshSecondStepView) headerView.findViewById(R.id.second_view);  mThirdView = (ibuRefreshThirdStepView) headerView.findViewById(R.id.third_view);  measureView(headerView);  addHeaderView(headerView);  headerViewHeight = headerView.getMeasuredHeight();  headerView.setPadding(0, -headerViewHeight, 0, 0);  Log.i("zhangqi","headerViewHeight="+headerViewHeight);  state = DONE;  isEnd = true;  isRefreable = false; } @Override public void onScrollStateChanged(AbsListView absListView, int i) { } @Override public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {  mFirstVisibleItem = firstVisibleItem; } @Override public boolean onTouchEvent(MotionEvent ev) {  if (isEnd) {//如果现在时结束的状态，即刷新完毕了，可以再次刷新了，在onRefreshComplete中设置   if (isRefreable) {//如果现在是可刷新状态 在setOnMeiTuanListener中设置为true    switch (ev.getAction()){     //用户按下    case MotionEvent.ACTION_DOWN:     //如果当前是在listview顶部并且没有记录y坐标     if (mFirstVisibleItem == 0 && !isRecord) {      //将isRecord置为true，说明现在已记录y坐标      isRecord = true;      //将当前y坐标赋值给startY起始y坐标      startY = ev.getY();     }     imageView_B.setVisibility(VISIBLE);     break;    //用户滑动    case MotionEvent.ACTION_MOVE:     //再次得到y坐标，用来和startY相减来计算offsetY位移值     float tempY = ev.getY();     //再起判断一下是否为listview顶部并且没有记录y坐标     if (mFirstVisibleItem == 0 && !isRecord) {      isRecord = true;      startY = tempY;     }     //如果当前状态不是正在刷新的状态，并且已经记录了y坐标     if (state!=REFRESHING && isRecord ) {      //计算y的偏移量      offsetY = tempY - startY;      //计算当前滑动的高度      float currentHeight = (-headerViewHeight+offsetY/3);      //用当前滑动的高度和头部headerView的总高度进行比 计算出当前滑动的百分比 0到1      float currentProgress = 1+currentHeight/headerViewHeight;      //如果当前百分比大于1了，将其设置为1，目的是让第一个状态的椭圆不再继续变大      if (currentProgress>=1) {       currentProgress = 1;      }      //如果当前的状态是放开刷新，并且已经记录y坐标      if (state == RELEASE_TO_REFRESH && isRecord) {       setSelection(0);       //如果当前滑动的距离小于headerView的总高度       if (-headerViewHeight+offsetY/RATIO<0) {        //将状态置为下拉刷新状态        state = PULL_TO_REFRESH;        //根据状态改变headerView，主要是更新动画和文字等信息        changeHeaderByState(state);        //如果当前y的位移值小于0，即为headerView隐藏了       }else if (offsetY<=0) {        //将状态变为done        state = DONE;        //根据状态改变headerView，主要是更新动画和文字等信息        changeHeaderByState(state);       }      }      //如果当前状态为下拉刷新并且已经记录y坐标      if (state == PULL_TO_REFRESH && isRecord) {       setSelection(0);       //如果下拉距离大于等于headerView的总高度       if (-headerViewHeight+offsetY/RATIO>=0) {        //将状态变为放开刷新        state = RELEASE_TO_REFRESH;        //根据状态改变headerView，主要是更新动画和文字等信息        changeHeaderByState(state);        //如果当前y的位移值小于0，即为headerView隐藏了       }else if (offsetY<=0) {        //将状态变为done        state = DONE;        //根据状态改变headerView，主要是更新动画和文字等信息        changeHeaderByState(state);       }      }      //如果当前状态为done并且已经记录y坐标      if (state == DONE && isRecord) {       //如果位移值大于0       if (offsetY>=0) {        //将状态改为下拉刷新状态        state = PULL_TO_REFRESH;       }      }      //如果为下拉刷新状态      if (state == PULL_TO_REFRESH) {       //则改变headerView的padding来实现下拉的效果       headerView.setPadding(0,(int)(-headerViewHeight+offsetY/RATIO) ,0,0);       //给第一个状态的View设置当前进度值       mFirstView.setCurrentProgress(currentProgress);       //重画       mFirstView.postInvalidate();      }      //如果为放开刷新状态      if (state == RELEASE_TO_REFRESH) {       //改变headerView的padding值       headerView.setPadding(0,(int)(-headerViewHeight+offsetY/RATIO) ,0, 0);       //给第一个状态的View设置当前进度值       mFirstView.setCurrentProgress(currentProgress);       //重画       mFirstView.postInvalidate();      }     }     break;    //当用户手指抬起时    case MotionEvent.ACTION_UP:     //如果当前状态为下拉刷新状态     if (state == PULL_TO_REFRESH) {      //平滑的隐藏headerView      this.smoothScrollBy((int)(-headerViewHeight+offsetY/RATIO)+headerViewHeight, 500);      //根据状态改变headerView      changeHeaderByState(state);     }     //如果当前状态为放开刷新     if (state == RELEASE_TO_REFRESH) {      //平滑的滑到正好显示headerView      this.smoothScrollBy((int)(-headerViewHeight+offsetY/RATIO), 500);      //将当前状态设置为正在刷新      state = REFRESHING;      //回调接口的onRefresh方法      mOnRefreshListener.onRefresh();      //根据状态改变headerView      changeHeaderByState(state);     }     //这一套手势执行完，一定别忘了将记录y坐标的isRecord改为false，以便于下一次手势的执行     isRecord = false;     break;    }   }  }  return super.onTouchEvent(ev); } private Animation animation; /**  * 根据状态改变headerView的动画和文字显示  * @param state  */ private void changeHeaderByState(int state){  switch (state) {  case DONE://如果的隐藏的状态   //设置headerView的padding为隐藏   headerView.setPadding(0, -headerViewHeight, 0, 0);   //第一状态的view显示出来   mFirstView.setVisibility(View.VISIBLE);   imageView_B.setVisibility(VISIBLE);   tv_pull_to_refresh.setText("下拉刷新");   //第二状态的view隐藏起来   mSecondView.setVisibility(View.GONE);   //停止第二状态的动画   secondAnim.stop();   //第三状态的view隐藏起来   mThirdView.setVisibility(View.GONE);   //停止第三状态的动画   thirdAnim.stop();   break;  case RELEASE_TO_REFRESH://当前状态为放开刷新   //文字显示为放开刷新   tv_pull_to_refresh.setText("放开刷新");   //第一状态view隐藏起来   mFirstView.setVisibility(View.GONE);   //第二状态view显示出来   mSecondView.setVisibility(View.VISIBLE);   //播放第二状态的动画  secondAnim.start();   //第三状态view隐藏起来   mThirdView.setVisibility(View.GONE);   //停止第三状态的动画  thirdAnim.stop();   break;  case PULL_TO_REFRESH://当前状态为下拉刷新   imageView_B.setVisibility(VISIBLE);   //设置文字为下拉刷新   tv_pull_to_refresh.setText("下拉刷新");   //第一状态view显示出来   mFirstView.setVisibility(View.VISIBLE);   //第二状态view隐藏起来   mSecondView.setVisibility(View.GONE);   //第二状态动画停止   secondAnim.stop();   //第三状态view隐藏起来   mThirdView.setVisibility(View.GONE);   //第三状态动画停止   thirdAnim.stop();   break;  case REFRESHING://当前状态为正在刷新   //文字设置为正在刷新   tv_pull_to_refresh.setText("正在刷新");   //第一状态view隐藏起来   mFirstView.setVisibility(View.GONE);   //第三状态view显示出来   mThirdView.setVisibility(View.VISIBLE);   //第二状态view隐藏起来   mSecondView.setVisibility(View.GONE);   //停止第二状态动画   secondAnim.stop();   //启动第三状态view   thirdAnim.start();   imageView_B.setVisibility(GONE);    animation = new TranslateAnimation(0, 0, 0, 600);   animation.setDuration(3000);   imageViewBack.setAnimation(animation);   break;  default:   break;  } } private void measureView(View child) {  ViewGroup.LayoutParams p = child.getLayoutParams();  if (p == null) {   p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,     ViewGroup.LayoutParams.WRAP_CONTENT);  }  int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);  int lpHeight = p.height;  int childHeightSpec;  if (lpHeight > 0) {   childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,     MeasureSpec.EXACTLY);  } else {   childHeightSpec = MeasureSpec.makeMeasureSpec(0,     MeasureSpec.UNSPECIFIED);  }  child.measure(childWidthSpec, childHeightSpec); }}