Android使用View绘制折线图，饼状图，柱状图等

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