菜鸟懒人一枚

目的：复制这一个java文件就可以在java代码中一句代码设置Button的圆角弧度、选择器，不用再写XML文件

初学者只考虑简单，不考虑其他什么性能不性能的问题哈。
希望得到各位大神的指点，帮助修改、更新其他功能。

package com.yxz.firstcode.view;

import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.StateListDrawable;
import android.util.AttributeSet;
import android.widget.Button;

import com.yxz.firstcode.util.Log;

public class ButtonDiy extends Button {

    int mDefaultColorResId;//默认状态的颜色-资源id
    int mPressedColorResId;//按下状态的颜色-资源id
    private float mRadius;//圆角角度
    private String mDefaultColorStr;//默认状态的颜色-String
    private String mPressedColorStr;//按下状态的颜色-String

    public ButtonDiy(Context context) {
        super(context, null);
    }

    public ButtonDiy(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    /**
     * 初始化
     */
    private void init() {
        mDefaultColorStr = "#FFCCCCCC";
        mPressedColorStr = "#FF333333";
        mRadius = 10F;

        addColorSelector(mDefaultColorStr, mPressedColorStr, mRadius);
    }

    /**
     * 设置选择器和圆角角度
     *
     * @param defaultColor 默认的颜色
     * @param pressedColor 按下的颜色
     * @param radius       圆角角度
     */
    public void addColorSelector(String defaultColor, String pressedColor, float radius) {
        /*判断参数是否可用*/
        mDefaultColorStr = defaultColor == null ? mDefaultColorStr : defaultColor;
        mPressedColorStr = pressedColor == null ? mPressedColorStr : pressedColor;
        mRadius = radius < 0 ? mRadius : radius;

        /*设置圆角和填充色*/
        GradientDrawable drawableDefault = new GradientDrawable();
        drawableDefault.setColor(Color.parseColor(mDefaultColorStr));
        drawableDefault.setCornerRadius(mRadius);
        GradientDrawable drawablePressed = new GradientDrawable();
        drawablePressed.setColor(Color.parseColor(mPressedColorStr));
        drawablePressed.setCornerRadius(mRadius);

        StateListDrawable drawable = new StateListDrawable();//设置选择器
        //按下状态
        drawable.addState(new int[]{android.R.attr.state_pressed}, drawablePressed);
        //普通状态
        drawable.addState(new int[]{-android.R.attr.state_focused, -android.R.attr.state_selected,
                -android.R.attr.state_pressed}, drawableDefault);

        this.setBackground(drawable);
    }

    /**
     * 设置选择器和圆角角度
     *
     * @param defaultColorResId 默认颜色的资源id
     * @param pressedColorResId 按下颜色的资源id
     * @param radius            圆角的角度
     */
    public void addColorSelector(int defaultColorResId, int pressedColorResId, float radius) {

        /*设置圆角和填充色*/
        GradientDrawable drawableDefault = new GradientDrawable();
        GradientDrawable drawablePressed = new GradientDrawable();
        mRadius = radius;
        mDefaultColorResId = defaultColorResId;
        mPressedColorResId = pressedColorResId;
        try {
            drawableDefault.setColor(getResources().getColor(mDefaultColorResId));
            drawablePressed.setColor(getResources().getColor(mPressedColorResId));
        } catch (Exception e) {
            Log.e(ButtonDiy.class, "传递的参数未能找到资源文件。", e);
        }
        drawableDefault.setCornerRadius(mRadius);
        drawablePressed.setCornerRadius(mRadius);

        StateListDrawable drawable = new StateListDrawable();//设置选择器
        //按下状态
        drawable.addState(new int[]{android.R.attr.state_pressed}, drawablePressed);
        //普通状态
        drawable.addState(new int[]{-android.R.attr.state_focused, -android.R.attr.state_selected,
                -android.R.attr.state_pressed}, drawableDefault);

        this.setBackground(drawable);
    }

}