android自定义veiw——波浪线

package com.qxf.archer.viewdemo1; import android.animation.ValueAnimator; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.support.annotation.Nullable; import android.util.AttributeSet; import android.view.View; import android.view.WindowManager; import android.view.animation.LinearInterpolator; /** * 类描述： * <p> * 作者：Administrator on 2017/7/10 0010 11:47 * 邮箱：377289596@qq.com */ public class MyWaveView extends View { private Paint mPaint; private Path mPath; // view宽度 private int width; // view高度 private int height; // 波浪高低偏移量 private int offset = 20; // X轴，view的偏移量 private int xoffset = 0; // view的Y轴高度 private int viewY = 0; // 波浪速度 private int waveSpeed = 50; private ValueAnimator animator; public MyWaveView(Context context) { super(context); init(context); } public MyWaveView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); init(context); } private void init(Context context) { mPaint = new Paint(); mPaint.setColor(Color.RED); mPaint.setStyle(Paint.Style.STROKE); mPaint.setAntiAlias(true); mPaint.setStrokeWidth(5); mPath = new Path(); WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); width = wm.getDefaultDisplay().getWidth(); animator = new ValueAnimator(); animator.setFloatValues(0, width); animator.setDuration(waveSpeed * 20); animator.setRepeatCount(-1); animator.setInterpolator(new LinearInterpolator()); animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { float change = (float) animation.getAnimatedValue(); xoffset = (int) change; invalidate(); } }); animator.start(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); setMeasuredDimension(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec)); } private int measureWidth(int measureSpec) { int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); //设置一个默认值，就是这个View的默认宽度为500，这个看我们自定义View的要求 int result = 500; if (specMode == MeasureSpec.AT_MOST) {//相当于我们设置为wrap_content result = specSize; } else if (specMode == MeasureSpec.EXACTLY) {//相当于我们设置为match_parent或者为一个具体的值 result = specSize; } width = result; return result; } private int measureHeight(int measureSpec) { int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); int result = 500; if (specMode == MeasureSpec.AT_MOST) { result = specSize; } else if (specMode == MeasureSpec.EXACTLY) { result = specSize; } height = specSize; return result; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mPath.reset(); viewY = height / 2; // 绘制屏幕内的波浪 mPath.moveTo(xoffset, viewY); mPath.quadTo(width / 4 + xoffset, viewY - offset, width / 2 + xoffset, viewY); mPath.moveTo(width / 2 + xoffset, viewY); mPath.quadTo(width / 4 * 3 + xoffset, viewY + offset, width + xoffset, viewY); // 绘制屏幕外的波浪 mPath.moveTo(xoffset - width, viewY); mPath.quadTo(width / 4 + xoffset - width, viewY - offset, width / 2 + xoffset - width, viewY); mPath.moveTo(width / 2 + xoffset - width, viewY); mPath.quadTo(width / 4 * 3 + xoffset - width, viewY + offset, width + xoffset - width, viewY); canvas.drawPath(mPath, mPaint); } /** * 设置 波浪的高度 */ public void setWaveHeight(int waveHeight){ offset = waveHeight; } /** * 获取 波浪的高度 */ public int getWaveHeight(){ return offset; } /** * 设置 波浪的速度 */ public void setWaveSpeed(int speed){ waveSpeed = 2000 - speed * 20; animator.setDuration(waveSpeed); } /** * 获取 波浪的速度 */ public int getWaveSpeed(){ return waveSpeed; } }