思路

不给textview设置背景属性（background），在textview的ondraw（）方法中画一个背景颜色。直接上代码

package com.example.admin.myapplication.widget;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

import android.util.AttributeSet;

import android.view.MotionEvent;

import com.example.admin.myapplication.R;

/**

* Created by admin on 2018/11/9.

*

* 封装内容：圆角  按下的颜色

*/

public class WrapTextViewextends android.support.v7.widget.AppCompatTextView {

private int pressedColor;

    private float radius;

    private RectFrect;

    private Paintpaint;

    public WrapTextView(Context context) {

super(context);

    }

public WrapTextView(Context context, AttributeSet attrs) {

super(context, attrs);

        initAttrs(context, attrs);

        initPaint();

    }

public WrapTextView(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

        initAttrs(context, attrs);

        initPaint();

    }

private void initAttrs(Context context, AttributeSet attrs) {

TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.WrapTextView);

        pressedColor = typedArray.getColor(R.styleable.WrapTextView_press_state, Color.RED);

        radius = typedArray.getDimension(R.styleable.WrapTextView_radius, 10);

        typedArray.recycle();

    }

private void initPaint() {

rect =new RectF();

        paint =new Paint();

        paint.setStrokeWidth(10);

        paint.setColor(Color.RED);

        paint.setAntiAlias(true);

    }

@Override

    protected void onDraw(Canvas canvas) {

canvas.drawRoundRect(rect, radius, radius, paint);

        super.onDraw(canvas);

    }

@Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int width = getMeasuredWidth();

        int height = getMeasuredHeight();

        rect.set(0, 0, width, height);

    }

@Override

    public boolean dispatchTouchEvent(MotionEvent event) {

int action = event.getAction();

        switch (action) {

case MotionEvent.ACTION_DOWN:

paint.setColor(pressedColor);

                postInvalidate();

break;

            case MotionEvent.ACTION_UP:

paint.setColor(Color.RED);

                postInvalidate();

break;

            default:

break;

        }

return super.dispatchTouchEvent(event);

    }

}