利用surfaceview和path绘图圆环，带指针

最新推荐文章于 2019-04-27 11:57:36 发布

原创最新推荐文章于 2019-04-27 11:57:36 发布 · 886 阅读

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CC 4.0 BY-SA版权

文章标签：

#android #线程 #图形 #path #canvas

本文详细介绍了如何使用自定义ProgressView类实现动态进度显示。通过继承SurfaceView并重写其回调方法，配合自定义线程MyThread实现了进度条的动态更新及绘制。文章展示了具体的实现代码，包括绘制圆形进度条、弧形进度指示等。

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sufurfaceview类

package com.progress;

import android.content.Context;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class ProgressView extends SurfaceView implements SurfaceHolder.Callback{

	private MyThread thread;

	public ProgressView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
	}

	public ProgressView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
	}

	public ProgressView(Context context) {
		super(context);
		SurfaceHolder holder = getHolder();
		holder.addCallback(this);
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		thread = new MyThread(holder);
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		thread.setRect(0, 0, width, height);
		thread.start();
		
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		thread.isRunning = false;
	}

}

绘制图形线程类

package com.progress;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.SystemClock;
import android.view.SurfaceHolder;

public class MyThread extends Thread {
	private SurfaceHolder holder;
	public boolean isRunning;
	private Paint paint;
	private Rect rect;
	public MyThread(SurfaceHolder holder){
		this.holder = holder;
		isRunning = true;
		paint = new Paint();
		rect = null;
	}
	public void setRect(int left,int top,int right,int bottom){
		rect = new Rect(left, top, right, bottom);
	}
	@Override
	public void run() {
		int count = 0;
		while(isRunning){
			Canvas canvas = holder.lockCanvas();
			if(rect==null){
				
			}else{
				paint.setColor(Color.WHITE);
				canvas.drawRect(rect, paint);
			}
		
			paint.setColor(Color.GREEN);
			
			paint.setStyle(Style.STROKE);
			paint.setStrokeWidth(15);
			paint.setAntiAlias(true);
			int radio = rect.width()/2-60;
			canvas.drawCircle(rect.width()/2, rect.height()/2, radio, paint);
			
			RectF rectf = new RectF(rect.width()/2-radio, rect.height()/2-radio, rect.width()/2+radio, rect.height()/2+radio);
			//TODO 更改颜色有些问题
			if(count-360>0){
				paint.setColor(Color.LTGRAY);
			}else if(count-360==0){
				paint.setColor(Color.CYAN);
			}else{
				paint.setColor(Color.MAGENTA);
			}
			canvas.drawArc(rectf, 0, count, false, paint);
			
			
			paint.setColor(Color.RED);
			paint.setStyle(Style.FILL);
			canvas.drawCircle(rect.width()/2, rect.height()/2, 40, paint);
			
			
			Path path = new Path();
			int helfWidth = rect.width()/2;
			int helfHeight = rect.height()/2;
			int startX = (int) (helfWidth+radio*Math.cos(Math.toRadians(count)));
			int startY = (int) (helfHeight+radio*Math.sin(Math.toRadians(count)));
			int innerStartXLeft  = (int) (helfWidth+40*Math.cos(Math.toRadians(count+90)));
			int innerStartYLeft = (int) (helfHeight+40*Math.sin(Math.toRadians(count+90)));
			int innerStartXRight  = (int) (helfWidth+40*Math.cos(Math.toRadians(count-90)));
			int innerStartYRight = (int) (helfHeight+40*Math.sin(Math.toRadians(count-90)));
//			path.moveTo(helfWidth, helfHeight-helfWidth+40);
			path.moveTo(startX, startY);
//			path.lineTo(rect.width()/2-20, rect.height()/2);
//			path.lineTo(rect.width()/2+20, rect.height()/2);
			path.lineTo(innerStartXLeft, innerStartYLeft);
			path.lineTo(innerStartXRight, innerStartYRight);
			path.close();
			paint.setColor(Color.RED);
			paint.setStrokeWidth(6);
			canvas.drawPath(path, paint);
			
			paint.setTextSize(24);
			paint.setColor(Color.BLACK);
			
			drawArText(rectf, canvas, paint);
			holder.unlockCanvasAndPost(canvas);
			SystemClock.sleep(100);
			count++;
		}
	}
	private void drawArText(RectF rect,Canvas canvas,Paint paint){
		//在圆周绘制文字 TODO 做成钟表形式的样子 
		Path path;
		for(int i = 0;i<4;i++){
			path = new Path();
			path.addArc(rect, -90+i*90,90);
			canvas.drawTextOnPath(i*3+"", path, 0, -10, paint);
		}

		canvas.save();
	}
}

这样就可以了

这是下载地址

http://download.youkuaiyun.com/detail/jackice01/7669319