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);
}
}