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
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<?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>
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写一个类继承view
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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);
}
}
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在主页面布局中引入自定义view类
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<?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>
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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服务器之家。
原文链接：https://blog.csdn.net/cyq_0927/article/details/78748111