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Android自定義View實現(xiàn)多片葉子旋轉(zhuǎn)滑動（五）

 更新時間：2017年03月23日 09:50:22   作者：罔少年  
這篇文章主要為大家詳細(xì)介紹了Android自定義View實現(xiàn)多片葉子葉子旋轉(zhuǎn)滑動，具有一定的參考價值，感興趣的小伙伴們可以參考一下

上一篇《Android 自定義View(四) 葉子飄動+旋轉(zhuǎn)效果》實現(xiàn)了單片葉子的滑動及旋轉(zhuǎn)，下面實現(xiàn)多片葉子的滑動旋轉(zhuǎn)功能

實現(xiàn)思路比較簡單，就是添加一個葉子Leaf類，儲存每片葉子的信息，

然后隨機(jī)產(chǎn)生葉子的坐標(biāo)及旋轉(zhuǎn)角度，最后實時獲取每片葉子信息，添加到畫布中

1、Leaf.java 葉子類

 private class Leaf {
  // 葉子的坐標(biāo)
  float x, y;
  // 旋轉(zhuǎn)角度
  int rotateAngle;
  // 起始時間(ms)
  long startTime;
 }

2、初始化每片葉子的信息，然后保存到list中

 //使葉子初始時間有間隔
 int addTime;
 private Leaf getLeaf() {
  Random random = new Random();
  Leaf leaf = new Leaf();
  //隨機(jī)初始化葉子初始角度
  leaf.rotateAngle = random.nextInt(360);
  //隨機(jī)初始化葉子啟動時間
  addTime += random.nextInt((int) (cycleTime));
  leaf.startTime = System.currentTimeMillis() + cycleTime + addTime;
  return leaf;
 }
 private List<Leaf> getLeafs(int leafSize) {
  List<Leaf> list = new LinkedList<Leaf>();
  for (int i=0; i<leafSize; i++) {
   list.add(getLeaf());
  }
  return list;
 }

3、接下去就是改寫getLocation()及getRotate()方法，使其返回每片葉子的坐標(biāo)及旋轉(zhuǎn)角度

 //獲取每片葉子在XY軸上的滑動值
 private void getLocation(Leaf leaf) {
  float betweenTime = leaf.startTime - System.currentTimeMillis();
  //周期結(jié)束再加一個cycleTime
  if(betweenTime < 0) {
   leaf.startTime = System.currentTimeMillis() + cycleTime + new Random().nextInt((int) (cycleTime));
   betweenTime = cycleTime;
  }
  //通過時間差計算出葉子的坐標(biāo)
  float fraction = (float) betweenTime / cycleTime;
  float x = (int)(width * fraction);
  leaf.x = x;
  float w = (float) ((float) 2 * Math.PI / width);
  int y = (int) (18 * Math.sin(w * x)) + (height-mLeafHeight)/2;
  leaf.y = y;

 }

 //獲取每片葉子的旋轉(zhuǎn)角度
 private void getRotate(Leaf leaf) {
  float scale = ((leaf.startTime - System.currentTimeMillis())%cycleTime)/ (float)cycleTime;
  int rotate = (int)(scale * 360);
  leaf.rotateAngle = rotate;
 }

4、在onDraw()方法中，畫出每片葉子

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  //畫葉子
  int size = leafList.size();
  for (int i=0; i<size; i++) {
   Leaf leaf = leafList.get(i);
   //獲取葉子坐標(biāo)
   getLocation(leaf);
   //獲取葉子旋轉(zhuǎn)角度
   getRotate(leaf);
   canvas.save();
   Matrix matrix = new Matrix();
   //設(shè)置滑動
   matrix.postTranslate(leaf.x, leaf.y);
   //設(shè)置旋轉(zhuǎn)
   matrix.postRotate(leaf.rotateAngle, leaf.x + mLeafWidth / 2, leaf.y + mLeafHeight / 2);
   //添加葉子到畫布
   canvas.drawBitmap(mLeafBitmap, matrix, new Paint());
   canvas.restore();
  }
  //調(diào)用onDraw()重復(fù)滑動
  postInvalidate();
 }

完整代碼：

public class LeafView extends View {
 private String TAG = "--------LeafView";
 private Resources mResources;
 //背景圖、葉子
 private Bitmap mLeafBitmap, bgBitmap;
 //整個控件的寬度和高度
 private int width, height;
 private Paint bgPaint;
 private RectF bgRect;
 private Rect bgDestRect;
 //存放葉子lsit
 private List<Leaf> leafList;
 //葉子的寬和高
 private int mLeafWidth, mLeafHeight;
 //葉子滑動一周的時間5秒
 private final static long cycleTime = 5000;
 //葉子數(shù)量
 private final static int leafNumber = 5;
 public LeafView(Context context, AttributeSet attrs) {
  super(context, attrs);
  mResources = getResources();
  mLeafBitmap = ((BitmapDrawable) mResources.getDrawable(R.drawable.leaf, null)).getBitmap();
  mLeafWidth = mLeafBitmap.getWidth();
  mLeafHeight = mLeafBitmap.getHeight()

  bgBitmap = ((BitmapDrawable) mResources.getDrawable(R.drawable.leaf_kuang, null)).getBitmap();
  bgPaint = new Paint();
  bgPaint.setColor(mResources.getColor(R.color.bg_color));
  //獲取所有葉子的信息，放入list
  leafList = getLeafs(leafNumber);
 }

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  width = w;
  height = h;
  bgDestRect = new Rect(0, 0 , width, height);
 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  bgRect = new RectF(0, 0 , width, height);
  //畫背景顏色到畫布
  canvas.drawRect(bgRect, bgPaint);
  //畫背景圖片到畫布
  canvas.drawBitmap(bgBitmap, null, bgDestRect, null);

  //畫葉子
  int size = leafList.size();
  for (int i=0; i<size; i++) {
   Leaf leaf = leafList.get(i);
   //獲取葉子坐標(biāo)
   getLocation(leaf);
   //獲取葉子旋轉(zhuǎn)角度
   getRotate(leaf);
   canvas.save();
   Matrix matrix = new Matrix();
   //設(shè)置滑動
   matrix.postTranslate(leaf.x, leaf.y);
   //設(shè)置旋轉(zhuǎn)
   matrix.postRotate(leaf.rotateAngle, leaf.x + mLeafWidth / 2, leaf.y + mLeafHeight / 2);
   //添加葉子到畫布
   canvas.drawBitmap(mLeafBitmap, matrix, new Paint());
   canvas.restore();
  }
  //調(diào)用onDraw()重復(fù)滑動
  postInvalidate();
 }

 //獲取每片葉子在XY軸上的滑動值
 private void getLocation(Leaf leaf) {
  float betweenTime = leaf.startTime - System.currentTimeMillis();
  //周期結(jié)束再加一個cycleTime
  if(betweenTime < 0) {
   leaf.startTime = System.currentTimeMillis() + cycleTime + new Random().nextInt((int) (cycleTime));
   betweenTime = cycleTime;
  }
  //通過時間差計算出葉子的坐標(biāo)
  float fraction = (float) betweenTime / cycleTime;
  float x = (int)(width * fraction);
  leaf.x = x;
  float w = (float) ((float) 2 * Math.PI / width);
  int y = (int) (18 * Math.sin(w * x)) + (height-mLeafHeight)/2;
  leaf.y = y;
 }

 //獲取每片葉子的旋轉(zhuǎn)角度
 private void getRotate(Leaf leaf) {
  float scale = ((leaf.startTime - System.currentTimeMillis())%cycleTime)/ (float)cycleTime;
  int rotate = (int)(scale * 360);
  leaf.rotateAngle = rotate;
 }

 private class Leaf {
  // 葉子的坐標(biāo)
  float x, y;
  // 旋轉(zhuǎn)角度
  int rotateAngle;
  // 起始時間(ms)
  long startTime;
 }

 private List<Leaf> getLeafs(int leafSize) {
  List<Leaf> list = new LinkedList<Leaf>();
  for (int i=0; i<leafSize; i++) {
   list.add(getLeaf());
  }
  return list;
 }

 //使葉子初始時間有間隔
 int addTime;
 private Leaf getLeaf() {
  Random random = new Random();
  Leaf leaf = new Leaf();
  leaf.rotateAngle = random.nextInt(360);
  addTime += random.nextInt((int) (cycleTime));
  leaf.startTime = System.currentTimeMillis() + cycleTime + addTime;
  return leaf;
 }
}

這里還有很多瑕疵，比如葉子的滑動范圍覆蓋了邊框等等

需要圖片等信息的可以從下面的Github地址下載，不過原文比較復(fù)雜

參考 https://github.com/Ajian-studio/GALeafLoading

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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