Android自定义View实现风车效果
作者:这个杀手不太累
这篇文章主要为大家详细介绍了Android自定义View实现风车效果,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
本文实例为大家分享了Android自定义View实现风车效果的具体代码,供大家参考,具体内容如下
效果图:
画杆
public class WindmillRodView extends View { private int mWidth; private int mHeight; private Paint mPaint; public WindmillRodView(Context context) { this(context, null); } public WindmillRodView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public WindmillRodView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { mPaint = new Paint(); mPaint.setColor(Color.WHITE); mPaint.setStyle(Paint.Style.FILL); mPaint.setAntiAlias(true); mPaint.setDither(true); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); } private int _rod_width = dp2px(2); @Override protected void onDraw(Canvas canvas) { int xCenter = mWidth / 2; int yCenter = mHeight / 3; int radius = mHeight / 3 * 2; drawRod(canvas, xCenter, yCenter, radius); } private void drawRod(Canvas canvas, int xCenter, int yCenter, int radius) { Path path = new Path(); path.moveTo(xCenter - _rod_width, yCenter); path.lineTo(xCenter - 2 * _rod_width, radius - dp2px(5)); path.lineTo((xCenter + 2 * _rod_width), radius - dp2px(5)); path.lineTo(xCenter + _rod_width, yCenter); path.close(); canvas.drawPath(path, mPaint); RectF rectF = new RectF(xCenter - 2 * _rod_width, radius - dp2px(8), xCenter + 2 * _rod_width, radius - dp2px(3)); canvas.drawOval(rectF, mPaint); } private int dp2px(int dp) { return (int) (Resources.getSystem().getDisplayMetrics().density * dp + 0.5); } }
先画风车的杆,再在底部画一个椭圆
画风车
public class WindmillView extends View { private int mWidth; private int mHeight; private Paint mPaint; private ObjectAnimator mRotationAnim; public WindmillView(Context context) { this(context, null); } public WindmillView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public WindmillView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { mPaint = new Paint(); mPaint.setColor(Color.WHITE); mPaint.setStyle(Paint.Style.FILL); mPaint.setAntiAlias(true); mPaint.setDither(true); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); } @Override protected void onDraw(Canvas canvas) { int xCenter = mWidth / 2; int yCenter = mHeight / 3; int radius = mHeight / 3 * 2; canvas.drawCircle(xCenter, yCenter - dp2px(7), dp2px(4), mPaint); setPivotX(xCenter); setPivotY(yCenter - dp2px(7)); canvas.save(); for (int i = 0; i < 3; i++) { Path path = new Path(); path.moveTo(xCenter, 0); path.lineTo(xCenter, yCenter - dp2px(11)); path.lineTo(xCenter + dp2px(8), yCenter - dp2px(26)); path.close(); // mPaint.setStrokeJoin(Paint.Join.ROUND); CornerPathEffect cornerPathEffect = new CornerPathEffect(30); mPaint.setPathEffect(cornerPathEffect); canvas.drawPath(path, mPaint); canvas.rotate(360 / 3, xCenter, yCenter - dp2px(7)); } canvas.restore(); startAnim(); } private int dp2px(int dp) { return (int) (Resources.getSystem().getDisplayMetrics().density * dp + 0.5); } public void startAnim() { if (mRotationAnim != null && mRotationAnim.isRunning()) return; mRotationAnim = ObjectAnimator.ofFloat(this, "Rotation", 360f) .setDuration(3000); mRotationAnim.setRepeatCount(-1); mRotationAnim.setInterpolator(new LinearInterpolator()); mRotationAnim.start(); } public void stopAnim() { if (mRotationAnim != null && mRotationAnim.isRunning()) { mRotationAnim.cancel(); mRotationAnim = null; } } }
这里使用画面的旋转方法,绘制扇页
旋转
使用属性动画来旋转
.... public void startAnim() { if (mRotationAnim != null && mRotationAnim.isRunning()) return; mRotationAnim = ObjectAnimator.ofFloat(this, "Rotation", 360f) .setDuration(3000); mRotationAnim.setRepeatCount(-1); mRotationAnim.setInterpolator(new LinearInterpolator()); mRotationAnim.start(); } public void stopAnim() { if (mRotationAnim != null && mRotationAnim.isRunning()) { mRotationAnim.cancel(); mRotationAnim = null; } } ....
在布局文件中使用
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#000000"> <com.example.windmill.WindmillRodView android:layout_width="200dp" android:layout_height="200dp" android:layout_centerInParent="true" /> <com.example.windmill.WindmillView android:layout_width="200dp" android:layout_height="200dp" android:layout_centerInParent="true" /> </RelativeLayout>
这里只是介绍了如何绘制类似的效果,很多计算都是写死的,如果要实际使用的话,最好写成自定义属性通过xml属性声明传进去。
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脚本之家。