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项目小案例画一个进度条，中间还有进度的百分比

2017-11-01 19:21 381 查看

package com.bwei.im.view;

	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.Color;
	import android.graphics.Paint;
	import android.graphics.Rect;
	import android.graphics.RectF;
	import android.support.annotation.Nullable;
	import android.util.AttributeSet;
	import android.view.View;

	/**
	* Created by muhanxi on 17/11/1.
	*/

	public class CustomProgrssView extends View {

	//定义一个画笔
	private Paint paint ;

	private boolean runing = true ;

	private int progress = 0 ;

	public CustomProgrssView(Context context) {
	super(context);
	}

	public CustomProgrssView(Context context, @Nullable AttributeSet attrs) {
	super(context, attrs);

	//创建一个画笔
	paint = new Paint();
	// 抗锯齿
	paint.setAntiAlias(true);
	//设置画笔的颜色
	paint.setColor(Color.RED);
	//设置画笔填充是空心的
	paint.setStyle(Paint.Style.STROKE);


	new Thread(new Runnable() {
	@Override
	public void run() {

	while (runing){


	if(progress >= 360){
	runing = false;
	return;
	}
	System.out.println("progress = " + progress);
	progress += 10 ;

	//子线程刷新系统调用onDraw（）方法
	postInvalidate();

	try {
	Thread.sleep(100);
	} catch (InterruptedException e) {
	e.printStackTrace();
	}

	}

	}
	}).start();



	}


	float sweep ;

	public CustomProgrssView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
	super(context, attrs, defStyleAttr);
	}





	@Override
	protected void onDraw(Canvas canvas) {
	super.onDraw(canvas);


	// getWidth（）获取当前View 的宽度
	int x = getWidth() / 2 ;
	int y = getHeight() / 2 ;

	int radius = 200 ;


	//设置画笔的粗细
	paint.setStrokeWidth(30);
	//定义一个区域
	RectF rectF = new RectF(x-radius,y-radius,x+radius,y+radius);
	//画弧
	// useCentor true 从中心点开始画 false 中心点不现实
	canvas.drawArc(rectF,-90,progress,false,paint);


	int text = (int) ((float)progress / 360 * 100 );

	// measureText 测量字符串的宽度
	float textWidth = paint.measureText(text+"%");
	Rect rextText = new Rect();
	// rextText.height() 获取字符串的高度
	paint.getTextBounds(text+"%",0,(text+"%").length(),rextText);


	paint.setTextSize(30);
	paint.setStrokeWidth(1);
	//画文字
	canvas.drawText(text+"%",x-textWidth/2,y+rextText.height()/2,paint);


	}
	}

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