Android 圆形旋转碟子 Android自定义View实现QQ音乐中圆形旋转碟子
Hensen_ 人气:1想了解Android自定义View实现QQ音乐中圆形旋转碟子的相关内容吗,Hensen_在本文为您仔细讲解Android 圆形旋转碟子的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:Android仿QQ音乐中圆形旋转,Android音乐圆形旋转,Android圆形旋转碟子,下面大家一起来学习吧。
QQ音乐中圆形旋转碟子
思路分析:
1、在onMeasure中测量整个View的宽和高后,设置宽高
2、获取我们res的图片资源后,在ondraw方法中进行绘制圆形图片
3、通过Handler发送Runnable来启动旋转线程(如果只想做圆形头像的话,这步可以去掉)
4、在布局中使用我们的View
效果图:
贴出我们的变量信息:
//view的宽和高 int mHeight = 0; int mWidth = 0; //圆形图片 Bitmap bitmap = null; //圆形图片的真实半径 int radius = 0; //旋转动画的矩形 Matrix matrix = new Matrix(); //旋转动画的角度 int degrees = 0;
步骤一:测量整个View的宽和高后,设置宽高
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //测量整个View的宽和高 mWidth = measuredWidth(widthMeasureSpec); mHeight= measuredHeight(heightMeasureSpec); setMeasuredDimension(mWidth, mHeight); } private int measuredWidth(int widthMeasureSpec) { int Mode = MeasureSpec.getMode(widthMeasureSpec); int Size = MeasureSpec.getSize(widthMeasureSpec); if (Mode == MeasureSpec.EXACTLY) { mWidth = Size; } else { //由图片决定宽度 int value = getPaddingLeft() + getPaddingRight() + bitmap.getWidth(); if (Mode == MeasureSpec.AT_MOST) { //由图片和Padding决定宽度,但是不能超过View的宽 mWidth = Math.min(value, Size); } } return mWidth; } private int measuredHeight(int heightMeasureSpec) { int Mode = MeasureSpec.getMode(heightMeasureSpec); int Size = MeasureSpec.getSize(heightMeasureSpec); if (Mode == MeasureSpec.EXACTLY) { mHeight = Size; } else { //由图片决定高度 int value = getPaddingTop() + getPaddingBottom() + bitmap.getHeight(); if (Mode == MeasureSpec.AT_MOST) { //由图片和Padding决定高度,但是不能超过View的高 mHeight = Math.min(value, Size); } } return mHeight; }
步骤二:获取我们res的图片资源后,在ondraw方法中进行绘制圆形图片
//获取res的图片资源 bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon); @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.concat(matrix); //真实的半径必须是View的宽高最小值 radius = Math.min(mWidth, mHeight); //如果图片本身宽高太大,进行相应的缩放 bitmap = Bitmap.createScaledBitmap(bitmap, radius, radius, false); //画圆形图片 canvas.drawBitmap(createCircleImage(bitmap, radius), 0, 0, null); matrix.reset(); } private Bitmap createCircleImage(Bitmap source, int radius) { Paint paint = new Paint(); paint.setAntiAlias(true); Bitmap target = Bitmap.createBitmap(radius, radius, Bitmap.Config.ARGB_8888); //产生一个同样大小的画布 Canvas canvas = new Canvas(target); //首先绘制圆形 canvas.drawCircle(radius / 2, radius / 2, radius / 2, paint); //使用SRC_IN模式显示后画图的交集处 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); //绘制图片,从(0,0)画 canvas.drawBitmap(source, 0, 0, paint); return target; }
步骤三:通过Handler发送Runnable来启动旋转线程
//开始旋转 mHandler.post(runnable); [java] view plain copy 在CODE上查看代码片派生到我的代码片 //-----------旋转动画----------- Handler mHandler = new Handler(); Runnable runnable = new Runnable() { @Override public void run() { matrix.postRotate(degrees++, radius / 2, radius / 2); //重绘 invalidate(); mHandler.postDelayed(runnable, 50); } };
步骤四:在布局中使用我们的View
<com.handsome.cycle.MyCycleView android:layout_width="wrap_content" android:layout_height="wrap_content" />
下面是整个类的源码
public class MyCycleView extends View { //view的宽和高 int mHeight = 0; int mWidth = 0; //圆形图片 Bitmap bitmap = null; //圆形图片的真实半径 int radius = 0; //旋转动画的矩形 Matrix matrix = new Matrix(); //旋转动画的角度 int degrees = 0; //-----------旋转动画----------- Handler mHandler = new Handler(); Runnable runnable = new Runnable() { @Override public void run() { matrix.postRotate(degrees++, radius / 2, radius / 2); //重绘 invalidate(); mHandler.postDelayed(runnable, 50); } }; public MyCycleView(Context context) { super(context); initView(); } public MyCycleView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } public MyCycleView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } public void initView() { //获取res的图片资源 bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon); //开始旋转 mHandler.post(runnable); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //测量整个View的宽和高 mWidth = measuredWidth(widthMeasureSpec); mHeight = measuredHeight(heightMeasureSpec); setMeasuredDimension(mWidth, mHeight); } private int measuredWidth(int widthMeasureSpec) { int Mode = MeasureSpec.getMode(widthMeasureSpec); int Size = MeasureSpec.getSize(widthMeasureSpec); if (Mode == MeasureSpec.EXACTLY) { mWidth = Size; } else { //由图片决定宽度 int value = getPaddingLeft() + getPaddingRight() + bitmap.getWidth(); if (Mode == MeasureSpec.AT_MOST) { //由图片和Padding决定宽度,但是不能超过View的宽 mWidth = Math.min(value, Size); } } return mWidth; } private int measuredHeight(int heightMeasureSpec) { int Mode = MeasureSpec.getMode(heightMeasureSpec); int Size = MeasureSpec.getSize(heightMeasureSpec); if (Mode == MeasureSpec.EXACTLY) { mHeight = Size; } else { //由图片决定高度 int value = getPaddingTop() + getPaddingBottom() + bitmap.getHeight(); if (Mode == MeasureSpec.AT_MOST) { //由图片和Padding决定高度,但是不能超过View的高 mHeight = Math.min(value, Size); } } return mHeight; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.concat(matrix); //真实的半径必须是View的宽高最小值 radius = Math.min(mWidth, mHeight); //如果图片本身宽高太大,进行相应的缩放 bitmap = Bitmap.createScaledBitmap(bitmap, radius, radius, false); //画圆形图片 canvas.drawBitmap(createCircleImage(bitmap, radius), 0, 0, null); matrix.reset(); } private Bitmap createCircleImage(Bitmap source, int radius) { Paint paint = new Paint(); paint.setAntiAlias(true); Bitmap target = Bitmap.createBitmap(radius, radius, Bitmap.Config.ARGB_8888); //产生一个同样大小的画布 Canvas canvas = new Canvas(target); //首先绘制圆形 canvas.drawCircle(radius / 2, radius / 2, radius / 2, paint); //使用SRC_IN模式显示后画图的交集处 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); //绘制图片,从(0,0)画 canvas.drawBitmap(source, 0, 0, paint); return target; } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
加载全部内容