Android自定义view画圆,圆上面有箭头,可控制速度,可控制颜色变化
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2022-07-04 11:42:58
Android自定义view画圆,圆上面有箭头,可控制速度,可控制颜色变化。
下面贴出具体类的使用方法:
package com.example.mycustomcircl...
Android自定义view画圆,圆上面有箭头,可控制速度,可控制颜色变化。
下面贴出具体类的使用方法:
package com.example.mycustomcirclearrowviewdemo.view; import android.content.Context; import android.content.res.TypedArray; 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.widget.Toast; import com.example.mycustomcirclearrowviewdemo.R; /** * Created by hasee on 2017/9/4. */ public class MyCustomCircleArrowView extends View { //从xml中获取的颜色 private int circleBoundColor; private float circleBoundWidth; //当前画笔画圆的颜色 private int CurrenCircleBoundColor; private Paint paint; public MyCustomCircleArrowView(Context context) { super(context); initVeiw(context); } public MyCustomCircleArrowView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); initVeiw(context); TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyCustomCircleArrowView); for (int i = 0; i < typedArray.getIndexCount(); i++) { //就是我们自定义的属性的资源id int attr = typedArray.getIndex(i); switch (attr) { case R.styleable.MyCustomCircleArrowView_circlr_bound_color: circleBoundColor = typedArray.getColor(attr, Color.RED); CurrenCircleBoundColor = circleBoundColor; break; case R.styleable.MyCustomCircleArrowView_circlr_bound_width: circleBoundWidth = typedArray.getDimension(attr, 3); break; } } } private void initVeiw(Context context) { paint = new Paint(); } public void setColor(int color) { if (CurrenCircleBoundColor != color) { CurrenCircleBoundColor = color; } else { CurrenCircleBoundColor = circleBoundColor; } } //圆心 private float pivotX; private float pivotY; private float radius = 130; private float currentDegree = 0; @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); paint.setAntiAlias(true); paint.setColor(CurrenCircleBoundColor); paint.setStrokeWidth(circleBoundWidth); paint.setStyle(Paint.Style.STROKE); pivotX = getWidth() / 2; pivotY = getHeight() / 2; canvas.drawCircle(pivotX, pivotY, radius, paint); canvas.save(); //旋转画布 , 如果旋转的的度数大的话,视觉上看着是旋转快的 canvas.rotate(currentDegree, pivotX, pivotY); //提供了一些api可以用来画线(画路径) Path path = new Path(); //从哪开始画 从A开始画 path.moveTo(pivotX + radius, pivotY); //从A点画一个直线到D点 path.lineTo(pivotX + radius - 20, pivotY - 20); //从D点画一个直线到B点 path.lineTo(pivotX + radius, pivotY + 20); //从B点画一个直线到C点 path.lineTo(pivotX + radius + 20, pivotY - 20); //闭合 -- 从C点画一个直线到A点 path.close(); paint.setStyle(Paint.Style.FILL); paint.setColor(Color.BLACK); canvas.drawPath(path, paint); canvas.restore(); //旋转的度数一个一个度数增加, 如果乘以一个速度的话,按一个速度速度增加 currentDegree += 1 * currentSpeed; if (!isPause) { invalidate(); } } private int currentSpeed = 1; private boolean isPause = false; public int speed() { ++currentSpeed; if (currentSpeed >= 10) { currentSpeed = 10; Toast.makeText(getContext(), "我比闪电还快", Toast.LENGTH_SHORT).show(); } return currentSpeed; } public void slowDown() { --currentSpeed; if (currentSpeed <=1) { currentSpeed = 1; } } public void pauseOrStart() { //如果是开始状态的话去重新绘制 if (isPause) { isPause = !isPause; invalidate(); } else { isPause = !isPause; } } }
这个类在xml文件里面声明,就可以使用
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