本文实例为大家分享了Android实现自动转圈效果展示的具体代码，供大家参考，具体内容如下

在values文件夹下创建attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="MyPb"> <attr name="circle_color" format="color" /> <attr name="circle_radius" format="dimension" /><!-- 尺寸 --> <attr name="circle_x" format="dimension" /> <attr name="circle_y" format="dimension" /> </declare-styleable></resources>

写一个类继承view

package widget;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;import com.bwie.zdycircle.R;import java.util.Timer;import java.util.TimerTask;/** * Created by Administrator on 2017/12/7. */public class MyPb extends View { private float radius, cx, cy; private Paint paint; private float sweepAngle;// 旋转角度 public MyPb(Context context) { super(context, null); } public MyPb(Context context, @Nullable AttributeSet attrs) { super(context, attrs); // 获取自定义的属性 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyPb); // 获取颜色 int color = a.getColor(R.styleable.MyPb_circle_color, Color.BLACK);// 获取不到给默认值 radius = a.getDimension(R.styleable.MyPb_circle_radius, 20); cx = a.getDimension(R.styleable.MyPb_circle_x, 100); cy = a.getDimension(R.styleable.MyPb_circle_y, 100); // 需要回收 a.recycle(); paint = new Paint(); paint.setAntiAlias(true);// 抗锯齿 paint.setColor(color); paint.setStyle(Paint.Style.STROKE);// 空心 Timer timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { if (sweepAngle > 360) { return; } sweepAngle += 1; postInvalidate(); } }, 1000, 20);// 每隔20毫秒执行一次 } @Override protected void onDraw(Canvas canvas) { paint.setColor(Color.BLUE); paint.setStrokeWidth(10); canvas.drawCircle(cx, cy, radius, paint);// 画圆 paint.setStrokeWidth(20);// 粗细 // 画运动的轨迹 paint.setColor(Color.RED); // 上下左右与圆重合，左边为圆心的横坐标减去半径，上边为纵坐标减去半径,以此类推 RectF rectF = new RectF(cx - radius, cy - radius, cx + radius, cy + radius); // 起始角度，旋转角度，第三个属性为是否填充，画笔 canvas.drawArc(rectF, -90, sweepAngle, false, paint); // 绘制文字 int progress = (int) (sweepAngle / 360f * 100); paint.setTextSize(50); paint.setStrokeWidth(0); paint.setColor(Color.BLACK); canvas.drawText(progress + "%", cx - 20, cy, paint); }}

在主页面布局中引入自定义view类

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.bwie.zdycircle.MainActivity"> <widget.MyPb android:layout_width="wrap_content" android:layout_height="wrap_content" app:circle_color="#0000ff" app:circle_radius="70dp" app:circle_x="200dp" app:circle_y="200dp" /></LinearLayout>

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。