代码实现drawable文件夹下的shape，selector

代码实现shape，selector避免多次创建多个xml文件

代码实现

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package com.mjm.threadproject.statebutton;

import android.content.Context;

import android.content.res.ColorStateList;

import android.content.res.TypedArray;

import android.graphics.Color;

import android.graphics.Rect;

import android.graphics.RectF;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.GradientDrawable;

import android.graphics.drawable.StateListDrawable;

import android.util.AttributeSet;

import android.view.Gravity;

import com.mjm.threadproject.R;

public final class RoundButton extends android.support.v7.widget.AppCompatButton {

private int[][] states;

private StateListDrawable mStateBackground;

private GradientDrawable mNormalBackground;

private GradientDrawable mPressedBackground;

private GradientDrawable mUnableBackground;

private int mNormalTextColor;

private int mPressedTextColor;

private int mUnableTextColor;

private ColorStateList mTextColorStateList;

private int strokeDashWidth;

private int strokeDashGap;

private int cornerRadius;

private int btn_normalStrokeColor;

private int btn_pressedSrokeColor;

private int btn_unableStrokeColor;

private int mNormalStrokeWidth;

private int mPressedStokeWidth;

private int mUnableStrokeWidth;

private int btn_normalSolidColor;

private int btn_pressedSolidColor;

private int btn_unableSolidColor;

public RoundButton(Context context) {
this(context, null);
}

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

public RoundButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context, attrs);
}

private void init(Context context, AttributeSet attrs) {
states = new int[4][];
Drawable drawable = getBackground();
if(drawable != null && drawable instanceof StateListDrawable){
mStateBackground = (StateListDrawable) drawable;
}else{
mStateBackground = new StateListDrawable();
}

mNormalBackground = new GradientDrawable();
mPressedBackground = new GradientDrawable();
mUnableBackground = new GradientDrawable();
//pressed, focused, normal, unable四种状态
states[0] = new int[] { android.R.attr.state_enabled, android.R.attr.state_pressed };
states[1] = new int[] { android.R.attr.state_enabled, android.R.attr.state_focused };
states[3] = new int[] { -android.R.attr.state_enabled};
states[2] = new int[] { android.R.attr.state_enabled };

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundButton);
//textcolor
mTextColorStateList = getTextColors();
int mDefaultNormalTextColor = mTextColorStateList.getColorForState(states[2], getCurrentTextColor());
int mDefaultPressedTextColor = mTextColorStateList.getColorForState(states[0], getCurrentTextColor());
int mDefaultUnableTextColor = mTextColorStateList.getColorForState(states[3], getCurrentTextColor());
mNormalTextColor = a.getColor(R.styleable.RoundButton_btn_normalTextcolor,mDefaultNormalTextColor);
mPressedTextColor = a.getColor(R.styleable.RoundButton_btn_pressedTextcolor,mDefaultPressedTextColor);
mUnableTextColor = a.getColor(R.styleable.RoundButton_btn_unableTextcolor,mDefaultUnableTextColor);
cornerRadius = a.getLayoutDimension(R.styleable.RoundButton_btnCornerRadius, 0);

//背景
btn_normalSolidColor = a.getColor(R.styleable.RoundButton_btn_normalSolidColor,0);
btn_pressedSolidColor = a.getColor(R.styleable.RoundButton_btn_pressedSolidcolor,btn_normalSolidColor);
btn_unableSolidColor = a.getColor(R.styleable.RoundButton_btn_unableSolidcolor,btn_normalSolidColor);

//stroke
btn_normalStrokeColor = a.getColor(R.styleable.RoundButton_btn_normalStrokeColor, 0x0);
btn_pressedSrokeColor = a.getColor(R.styleable.RoundButton_btn_pressedStokeColor,0);
btn_unableStrokeColor = a.getColor(R.styleable.RoundButton_btn_unableStrokeColor,0);
mNormalStrokeWidth = a.getDimensionPixelSize(R.styleable.RoundButton_btn_normalStrokeWidth, 0);
mPressedStokeWidth = a.getDimensionPixelSize(R.styleable.RoundButton_btn_pressedStrokeWidth,0);
mUnableStrokeWidth = a.getDimensionPixelSize(R.styleable.RoundButton_btn_unableStrokeWidth,0);

strokeDashWidth = a.getDimensionPixelSize(R.styleable.RoundButton_btnStrokeDashWidth, 0);
strokeDashGap = a.getDimensionPixelSize(R.styleable.RoundButton_btnStrokeDashGap, 0);

a.recycle();

setSingleLine(true);
setGravity(Gravity.CENTER);

setup();
}

private void setup() {
//set text color
int[] colors = new int[] {mPressedTextColor, mPressedTextColor, mNormalTextColor, mUnableTextColor};
mTextColorStateList = new ColorStateList(states, colors);
setTextColor(mTextColorStateList);

//set radius
if (cornerRadius == -1){
RectF rect = new RectF(mNormalBackground.getBounds());
mNormalBackground.setCornerRadius((rect.height() > rect.width() ? rect.width() : rect.height()) / 2);
mPressedBackground.setCornerRadius((rect.height() > rect.width() ? rect.width() : rect.height()) / 2);
mUnableBackground.setCornerRadius((rect.height() > rect.width() ? rect.width() : rect.height()) / 2);
} else {
mNormalBackground.setCornerRadius(cornerRadius);
mPressedBackground.setCornerRadius(cornerRadius);
mUnableBackground.setCornerRadius(cornerRadius);
}
//set stroke
setStroke(mNormalBackground, btn_normalStrokeColor, mNormalStrokeWidth);
setStroke(mPressedBackground, btn_pressedSrokeColor, mPressedStokeWidth);
setStroke(mUnableBackground, btn_unableStrokeColor, mUnableStrokeWidth);

//set background
mNormalBackground.setColor(btn_normalSolidColor);
mPressedBackground.setColor(btn_pressedSolidColor);
mUnableBackground.setColor(btn_unableSolidColor);
mStateBackground.addState(states[0], mPressedBackground);
mStateBackground.addState(states[1], mPressedBackground);
mStateBackground.addState(states[3], mUnableBackground);
mStateBackground.addState(states[2], mNormalBackground);
setBackgroundDrawable(mStateBackground);
}

private void setStroke(GradientDrawable mBackground, int mStrokeColor, int mStrokeWidth) {
mBackground.setStroke(mStrokeWidth, mStrokeColor, strokeDashWidth, strokeDashGap);
}

}

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自定义属性

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="StateButton">

<!--text color-->
<attr name="normalTextColor" format="color|reference"/>
<attr name="pressedTextColor" format="color|reference"/>
<attr name="unableTextColor" format="color|reference"/>

<!--stroke width and color, dash width, dash gap-->
<attr name="strokeDashWidth" format="dimension|reference"/>
<attr name="strokeDashGap" format="dimension|reference"/>
<attr name="normalStrokeWidth" format="dimension|reference"/>
<attr name="pressedStrokeWidth" format="dimension|reference"/>
<attr name="unableStrokeWidth" format="dimension|reference"/>
<attr name="normalStrokeColor" format="color|reference"/>
<attr name="pressedStrokeColor" format="color|reference"/>
<attr name="unableStrokeColor" format="color|reference"/>

<!--background color-->
<attr name="normalBackgroundColor" format="color|reference"/>
<attr name="pressedBackgroundColor" format="color|reference"<
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/span>/>
<attr name="unableBackgroundColor" format="color|reference"/>

<!--background radius-->
<attr name="radius" format="dimension|reference"/>
<attr name="round" format="boolean|reference"/>

<!--animation duration-->
<attr name="animationDuration" format="integer|reference"/>

</declare-styleable>

<declare-styleable name="StateImageView">
<attr name="normalBackground" format="color|reference"/>
<attr name="pressedBackground" format="color|reference"/>
<attr name="unableBackground" format="color|reference"/>

<!--animation duration-->
<attr name="AnimationDuration" format="integer|reference"/>
</declare-styleable>
<declare-styleable name="RoundButton">
<!-- 背景色 -->
<attr name="btn_normalSolidColor" format="color"/>
<!--按下的背景色-->
<attr name="btn_pressedSolidcolor" format="color"/>
<!--unable背景色-->
<attr name="btn_unableSolidcolor" format="color"/>
<!--文字颜色-->
<attr name="btn_normalTextcolor" format="color"/>
<!--文字按下的颜色-->
<attr name="btn_pressedTextcolor" format="color"/>
<!--unable文字颜色-->
<attr name="btn_unableTextcolor" format="color"/>

<!-- 边框色 -->
<attr name="btn_normalStrokeColor" format="color"/>
<!--按下的边框颜色-->
<attr name="btn_pressedStokeColor" format="color"/>
<attr name="btn_unableStrokeColor" format="color"/>
<!-- 边框厚度 -->
<attr name="btn_normalStrokeWidth" format="dimension"/>
<!--按下的边框线宽-->
<attr name="btn_pressedStrokeWidth" format="dimension"/>
<!--unable-->
<attr name="btn_unableStrokeWidth" format="dimension"/>
<!-- 边框虚线长度 -->
<attr name="btnStrokeDashWidth" format="dimension"/>
<!-- 边框虚线间隙 -->
<attr name="btnStrokeDashGap" format="dimension"/>
<!-- 圆角半径，stadium 表示半径为 min(height,width) / 2-->
<attr name="btnCornerRadius" format="dimension">
<enum name="stadium" value="-1"/>
</attr>
<!-- 自动计算按下(pressed)状态颜色的系数, 值为0时不自动计算 -->
<attr name="btnPressedRatio" format="float"/>
</declare-styleable>
</resources>