Android使用View绘制折线图，饼状图，柱状图等

来源：互联网发布：sqlserver 日期格式化编辑：程序博客网时间：2024/05/21 17:16

Android中利用View进行绘制折线图，饼状图，柱状图：

绘制这些图形时，主要用到的知识点为：

1.画笔的设置

2.画布的设置

3.让该类继承View，并复写onDraw方法即可

由于源码较多，不进行代码粘贴了

下面进行截图看看：

1.折线图：

2.饼状图

3.柱状图

下面介绍几个方法关于绘制图形的：

可以参考这个api

http://www.android-doc.com/reference/android/graphics/Canvas.html

这里面方法很多：

//画一个点
        Paint paint=new Paint();
        paint.setColor(Color.BLUE);
        paint.setStrokeWidth(100);//设置点的宽度
        Canvas canvas=new Canvas(bitmap);
        canvas.drawPoint(100, 100, paint);
        chooseView.setImageBitmap(bitmap);
       //画一条直线
        Paint paint=new Paint();
        paint.setColor(Color.BLUE);
        paint.setStrokeWidth(10);//设置点的宽度
        float startX=10;
        float startY=20;
        float stopX=100;
        float stopY=200;
        Canvas canvas=new Canvas(bitmap);
        canvas.drawLine(startX, startY, stopX, stopY, paint);
        chooseView.setImageBitmap(bitmap);

      //画一个矩形
        Paint paint=new Paint();
        paint.setColor(Color.GRAY);
        paint.setStrokeWidth(10);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        Canvas canvas=new Canvas(bitmap);
        int left=10;
        int top=10;
        int right=100;
        int bottom=100;
        Rect rect=new Rect(left, top, right, bottom);
        canvas.drawRect(rect, paint);
//        canvas.drawRect(left, top, right, bottom, paint);
       chooseView.setImageBitmap(bitmap);
      //椭圆
        Paint paint=new Paint();
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.STROKE);
        int left=10;
        int top=20;
        int right=60;
        int bottom=100;
        RectF oval=new RectF(left, top, right, bottom);
        Canvas canvas=new Canvas(bitmap);
        canvas.drawOval(oval, paint);
        chooseView.setImageBitmap(bitmap);


       //圆
        Paint paint=new Paint();
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        Canvas canvas=new Canvas(bitmap);
        int cx=100;
        int cy=100;
        int radius=20;
        canvas.drawCircle(cx, cy, radius, paint);
        chooseView.setImageBitmap(bitmap);

       //路径
        Paint paint=new Paint();
        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.STROKE);

        //路
        Path path=new Path();
        path.moveTo(20, 20);
        path.lineTo(100, 200);
        path.lineTo(204, 164);
        path.lineTo(250, 175);
        path.lineTo(20, 20);
        Canvas canvas=new Canvas(bitmap);
        canvas.drawPath(path, paint);
        chooseView.setImageBitmap(bitmap);


       //绘制字体
        Paint paint=new Paint();
        paint.setColor(Color.YELLOW);
        paint.setTextSize(40);
        paint.setTypeface(Typeface.DEFAULT_BOLD);//设置字体
        //引用外部字体
        //Typeface typeface=Typeface.createFromAsset(getAssets(), "newFont.ttf");
        //paint.setTypeface(typeface);

        Canvas canvas=new Canvas(bitmap);
        canvas.drawText("fuck you!", 50, 100, paint);
        chooseView.setImageBitmap(bitmap);

        //把字画在线上
        Paint paint=new Paint();
        paint.setColor(Color.CYAN);
        paint.setTextSize(20);
        paint.setTypeface(Typeface.DEFAULT);

        Path path=new Path();
        path.moveTo(20, 20);
        path.lineTo(100, 150);
        path.lineTo(200, 220);

        Canvas canvas=new Canvas(bitmap);
        canvas.drawTextOnPath("Fuck you this text is on path!", path, 0, 0, paint);
       chooseView.setImageBitmap(bitmap);

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源码下载