折线图

public class MyView extends View {
    Paint paint,paint1,paint2,paint3;
    public MyView(Context context) {
        super(context);
    }

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        //X轴
         paint=new Paint();
        paint.setColor(Color.WHITE);
        paint.setStrokeWidth(5f);
        paint.setStyle(Paint.Style.FILL);
        //Y轴
        paint1=new Paint();
        paint1.setColor(Color.GREEN);
        paint1.setStrokeWidth(5f);
        paint1.setStyle(Paint.Style.FILL);
        //线段
        paint2=new Paint();
        paint2.setColor(Color.WHITE);
        paint2.setStrokeWidth(5f);
        paint2.setStyle(Paint.Style.FILL);
        //文字
        paint3=new Paint();
        paint3.setColor(Color.WHITE);
        paint3.setStrokeWidth(5f);
        paint3.setStyle(Paint.Style.FILL);
    }

    public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //X
canvas.drawLine(40,700,500,700,paint);
//Y
        canvas.drawLine(40,100,40,700,paint1);

        //折线
        canvas.drawLine(40,700,60,600,paint2);
        canvas.drawLine(60,600,100,650,paint2);
        canvas.drawLine(100,650,250,350,paint2);
        canvas.drawLine(250,350,280,500,paint2);
        canvas.drawLine(280,500,380,300,paint2);
        canvas.drawLine(380,300,420,350,paint2);

        //文字
        canvas.drawText("优",20,650,paint3);
        canvas.drawText("100",20,600,paint3);
        canvas.drawText("200",20,550,paint3);
        canvas.drawText("300",20,500,paint3);
        canvas.drawText("400",20,450,paint3);
        canvas.drawText("500",20,400,paint3);
        canvas.drawText("中",20,350,paint3);
        canvas.drawText("600",20,300,paint3);
        canvas.drawText("700",20,250,paint3);
        canvas.drawText("800",20,200,paint3);


        canvas.drawText("500",80,720,paint3);
        canvas.drawText("1000",180,720,paint3);
        canvas.drawText("1500",280,720,paint3);
        canvas.drawText("2000",380,720,paint3);
        canvas.drawText("2500",480,720,paint3);
    }
}
布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
  android:background="@color/black"
    >
    <com.bawei.qinchaomeng20190427.view.MyTitle
        android:layout_width="match_parent"
        android:layout_height="30dp" />
 
</LinearLayout>

标签：canvas,20,paint2,paint3,drawText,Paint,折线图
来源： https://blog.csdn.net/weixin_43584998/article/details/89813644