Android自定义View之继承TextView绘制背景

本文实例为大家分享了TextView绘制背景的方法，供大家参考，具体内容如下

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);
 }