自定义View之继承TextView绘制背景

自定义View之继承TextView绘制背景

本文是详解Android群英传学习记录自定义View篇的使用原有控件扩展的简单Demo

效果:

实现流程

1.初始化:对画笔进行设置

mPaintIn = new Paint();
mPaintIn.setAntiAlias(true);
mPaintIn.setDither(true);
mPaintIn.setStyle(Paint.Style.FILL); mPaintIn.setColor(getResources().getColor(R.color.colorPrimary));

mPaintOut = new Paint();
mPaintOut.setAntiAlias(true);
mPaintOut.setDither(true);
mPaintOut.setStyle(Paint.Style.FILL); mPaintOut.setColor(getResources().getColor(R.color.colorAccent));

2.绘制外框,内框,文字

获取组件宽高

int width = getMeasureWidth();
int height = getMeasureHeight();

绘制

@Override
    protected void onDraw(Canvas canvas) {
        //绘制背景,在绘制文字之前绘制
        canvas.drawRect(new Rect(0, 0, getMeasuredWidth(), getMeasuredHeight()), mPaintIn);
        canvas.drawRect(new Rect(10, 10, getMeasuredWidth()-10, getMeasuredHeight()-10), mPaintOut);

        super.onDraw(canvas);
    }

完毕