如何绘制路径到Android中的视图 [英] how to draw path into the view in android

问题描述

我需要绘制路径简洁的线条，应该写出来的红色长方形白色lines.but它不画了什么什么丢失英里的画布。 我的code：

 画布油画=新的Canvas（）;


       涂料粉刷=新的油漆（）;

       paint.setStyle（Paint.Style.FILL）;
       paint.setColor（Color.RED）;
       canvas.drawPaint（油漆）;
       路径path =新路径（）;
       //canvas.drawColor(Color.CYAN）;

       的for（int i = 5; I＆LT; 50;我++）{

           path.moveTo（4，I-1）;
           path.lineTo（4，I）;

       }
       path.close（）;

       paint.setStrokeWidth（3）;
       paint.setPathEffect（空）;
       paint.setColor（Color.WHITE）;
       paint.setStyle（Paint.Style.STROKE）;

       canvas.drawPath（路径，油漆）;

        的for（int i = 0;我3;;我++）{
            查看的iView = inflater.inflate（R.layout.linear_layout，NULL）;
            如果（我== 0）{
                iview.findViewById（R.id.imageView1）.setBackgroundResource（R.drawable.distspeed）;
            }
            如果（ⅰ== 1）{
                iview.findViewById（R.id.imageView1）.setBackgroundResource（R.drawable.hxmdist）;
            }
            如果（ⅰ== 2）{
                iview.findViewById（R.id.imageView1）.setBackgroundResource（R.drawable.hxmspeeed）;
            }

            iview.draw（画布）;

            realViewSwitcher.addView（iView中）;
        }
 

解决方案

我只张贴工作code：

修改活动：

 的for（int i = 0;我2;我++）{

        MyView的MVIEW =新的MyView的（这一点，我）;

        realViewSwitcher.addView（MVIEW）;
        }
 

MyView的：

 公共类MyView的扩展视图{

    公共MyView的（上下文的背景下，INT kolki）{
        超（上下文）;

        如果（kolki == 0）{
            this.setBackgroundResource（R.drawable.distspeed）;
        }
        如果（kolki == 1）{
            this.setBackgroundResource（R.drawable.hxmdist）;
        }
    }

    公共无效setBackgroundResource（INT渣油）{
        super.setBackgroundResource（渣油）;
    }

    公共无效的OnDraw（帆布C）{
        super.onDraw（C）;
        涂料粉刷=新的油漆（）;
        路径path =新路径（）;
        paint.setStyle（Paint.Style.FILL）;
        paint.setColor（Color.TRANSPARENT）;
        c.drawPaint（油漆）;
        的for（int i = 50; I＆LT; 100;我++）{
               path.moveTo（I，I-1）;
               path.lineTo（I，I）;
        }
        path.close（）;
        paint.setStrokeWidth（3）;
        paint.setPathEffect（空）;
        paint.setColor（Color.BLACK）;
        paint.setStyle（Paint.Style.STROKE）;
        c.drawPath（路径，油漆）;
    }

}
 

Hi i need to draw a path simple lines to the canvas it should write out red rectangle with white lines.but it do not draw out nothing what m i missing. my code:

Canvas canvas = new Canvas();


       Paint paint = new Paint();

       paint.setStyle(Paint.Style.FILL);
       paint.setColor(Color.RED);
       canvas.drawPaint(paint);
       Path path = new Path();
       //canvas.drawColor(Color.CYAN);

       for (int i = 5; i < 50; i++) {

           path.moveTo(4, i-1);
           path.lineTo(4, i);

       }
       path.close();

       paint.setStrokeWidth(3);
       paint.setPathEffect(null);
       paint.setColor(Color.WHITE);
       paint.setStyle(Paint.Style.STROKE);

       canvas.drawPath(path, paint);

        for (int i = 0; i < 3; i++) {
            View iview =    inflater.inflate(R.layout.linear_layout, null);
            if(i == 0){
                iview.findViewById(R.id.imageView1).setBackgroundResource(R.drawable.distspeed);
            }
            if(i == 1){
                iview.findViewById(R.id.imageView1).setBackgroundResource(R.drawable.hxmdist);
            }
            if(i == 2){
                iview.findViewById(R.id.imageView1).setBackgroundResource(R.drawable.hxmspeeed);
            }

            iview.draw(canvas);

            realViewSwitcher.addView(iview);
        }

解决方案

i only post the working code:

modified activity:

for (int i = 0; i < 2; i++) {

        MyView mView = new MyView(this,i);

        realViewSwitcher.addView(mView);
        }

myview:

public class MyView extends View {

    public MyView(Context context, int kolki) {
        super(context);

        if (kolki == 0){
            this.setBackgroundResource(R.drawable.distspeed);
        }
        if (kolki == 1){
            this.setBackgroundResource(R.drawable.hxmdist);
        }
    }

    public void setBackgroundResource (int resid){
        super.setBackgroundResource(resid);
    } 

    public void onDraw(Canvas c){
        super.onDraw(c);
        Paint paint = new Paint();
        Path path = new Path();
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(Color.TRANSPARENT);
        c.drawPaint(paint);
        for (int i = 50; i < 100; i++) {
               path.moveTo(i, i-1);
               path.lineTo(i, i);  
        }
        path.close();
        paint.setStrokeWidth(3);
        paint.setPathEffect(null);
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        c.drawPath(path, paint);
    }

}

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