Android自定义View旋转圆形图片

概述一个自定义View，记录一下思路和代码以备以后使用。思路：1.首先要画一个圆形图片和一个圆形背景图(通过自定义View);

一个自定义view，记录一下思路和代码以备以后使用。

思路：

1.首先要画一个圆形图片和一个圆形背景图(通过自定义view);
2.自定义view基本步骤初始化属性,测量宽高和中心点,然后绘制图片;
3.通过handler实现图片的角度旋转.然后然后就慢慢撸.

效果图：

 

1、废话不多直接上代码

public class MusicPlayerVIEw extends VIEw { private static final long ROTATE_DELAY = 5;//旋转动作时间 private int mRotatedegrees;//旋转的角度 private Handler mRotate; private int mWIDth; private int mHeight; private float mCenterX; private float mCenterY; private RectF rectF; private Bitmap mBitmapCover; private float mCoverScale; private BitmapShader mShader; private Paint paint; private boolean isRotating; private final Runnable mRunnableRotate = new Runnable() {  @OverrIDe  public voID run() {   if (isRotating) {    updateCoverRotate();    mRotate.postDelayed(mRunnableRotate,ROTATE_DELAY);   }  } }; /**  * 更新封面角度,重新绘制图片  */ private voID updateCoverRotate() {  mRotatedegrees += 1;  mRotatedegrees = mRotatedegrees % 360;  postInvalIDate(); } /**  * 判读是否在旋转  * @return  */ public boolean isRotating() {  return isRotating; } /**  * 开始旋转图片  */ public voID start(){  isRotating=true;  mRotate.removeCallbacksAndMessages(null);  mRotate.postDelayed(mRunnableRotate,ROTATE_DELAY);  postInvalIDate(); } /**  * 停止图片旋转  */ public voID stop(){  isRotating = false;  postInvalIDate(); } /**  * 通过本地图片设置封面图  */ public voID setCoverDrawable(int coverDrawable) {  Drawable drawable = getContext().getResources().getDrawable(coverDrawable);  mBitmapCover = drawabletoBitmap(drawable);  createShader();  postInvalIDate(); } /**  * 网络图片加载使用Picasso图片加载工具  *  * @param imageUrl  */ public voID setCoverURL(String imageUrl) {  Picasso.with(getContext()).load(imageUrl).into(target); } public MusicPlayerVIEw(Context context) {  super(context);  init(context,null); } public MusicPlayerVIEw(Context context,AttributeSet attrs) {  super(context,attrs);  init(context,attrs); } public MusicPlayerVIEw(Context context,AttributeSet attrs,int defStyleAttr) {  super(context,attrs,defStyleAttr);  init(context,attrs); } /**  * 初始化VIEw资源  *  * @param context  * @param attrs  */ private voID init(Context context,AttributeSet attrs) {  setwillNotDraw(false);  TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.play_vIEw);  Drawable mDrawableCover = a.getDrawable(R.styleable.play_vIEw_cover);  if (mDrawableCover != null) {   mBitmapCover = drawabletoBitmap(mDrawableCover);  }  a.recycle();  mRotatedegrees = 0;  //通过handler更新图片角度  mRotate = new Handler();  rectF = new RectF(); } /**  * 测量宽高,设置中心点中心点位置,创建阴影  *  * @param wIDthMeasureSpec  * @param heightmeasureSpec  */ @OverrIDe protected voID onMeasure(int wIDthMeasureSpec,int heightmeasureSpec) {  mWIDth = MeasureSpec.getSize(wIDthMeasureSpec);  mHeight = MeasureSpec.getSize(heightmeasureSpec);  int minSIDe = Math.min(mWIDth,mHeight); //取宽高最小值设置图片宽高  mWIDth = minSIDe;  mHeight = minSIDe;  setMeasuredDimension(mWIDth,mHeight);  //重新设置宽高  //中心点位置  mCenterX = mWIDth / 2f;  mCenterY = mHeight / 2f;  //设置图片显示位置  rectF.set(20.0f,20.0f,mWIDth - 20.0f,mHeight - 20.0f);  createShader();  super.onMeasure(wIDthMeasureSpec,heightmeasureSpec); } @OverrIDe protected voID onDraw(Canvas canvas) {  super.onDraw(canvas);  if (mShader == null) {   return;  }  //画封面图片 判读图片的中心距离xy,算出边角大小,然后画圆  float radius = mCenterX <= mCenterY ? mCenterX - 75.0f : mCenterY - 75.0f;  canvas.rotate(mRotatedegrees,mCenterX,mCenterY);  canvas.drawCircle(mCenterX,mCenterY,radius,paint); } @OverrIDe public boolean ontouchEvent(MotionEvent event) {  switch (event.getAction()) {   case MotionEvent.ACTION_DOWN:    break;  }  return super.ontouchEvent(event); } private Target target = new Target() {  @OverrIDe  public voID onBitmapLoaded(Bitmap bitmap,Picasso.LoadedFrom from) {   mBitmapCover = bitmap;   createShader();   postInvalIDate();  }  @OverrIDe  public voID onBitmapFailed(Drawable errorDrawable) {  }  @OverrIDe  public voID onPrepareLoad(Drawable placeHolderDrawable) {  } }; private int mCovercolor = color.YELLOW; private voID createShader() {  if (mWIDth == 0) {   return;  }  if (mBitmapCover == null) { //如果封面为为创建默认颜色   mBitmapCover = Bitmap.createBitmap(mWIDth,mHeight,Bitmap.Config.ARGB_8888);   mBitmapCover.erasecolor(mCovercolor);  }  mCoverScale = ((float) mWIDth) / (float) mBitmapCover.getWIDth();  //创建缩放后的bitmap  mBitmapCover = Bitmap.createScaledBitmap(mBitmapCover,(int) (mBitmapCover.getWIDth() * mCoverScale),(int) (mBitmapCover.getHeight() * mCoverScale),true);  mShader = new BitmapShader(mBitmapCover,Shader.TileMode.CLAMP,Shader.TileMode.CLAMP);  paint = new Paint();  paint.setAntiAlias(true);  paint.setShader(mShader); } /**  * 将drawable转换为位图 为BitmapShader准备  *  * @param drawable  * @return  */ private Bitmap drawabletoBitmap(Drawable drawable) {  if (drawable instanceof BitmapDrawable) {   return ((BitmapDrawable) drawable).getBitmap();  }  int wIDth = drawable.getIntrinsicWIDth();  wIDth = wIDth > 0 ? wIDth : 1;  int height = drawable.getIntrinsicHeight();  height = height > 0 ? height : 1;  Bitmap bitmap = Bitmap.createBitmap(wIDth,height,Bitmap.Config.ARGB_8888);  Canvas canvas = new Canvas(bitmap);  drawable.setBounds(0,canvas.getWIDth(),canvas.getHeight());  drawable.draw(canvas);  return bitmap; }}

2.差点忘记一个attrs属性

<?xml version="1.0" enCoding="utf-8"?><resources> <declare-styleable name="play_vIEw">  <attr name="cover" format="integer"/> </declare-styleable></resources>

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