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

<resources>
    <declare-styleable name="StateButton">

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

        
        <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"/>

        
        <attr name="normalBackgroundColor" format="color|reference"/>
        <attr name="pressedBackgroundColor" format="color|reference"/>
        <attr name="unableBackgroundColor" format="color|reference"/>

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

        
        <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"/>

        
        <attr name="AnimationDuration" format="integer|reference"/>
    declare-styleable>
    <declare-styleable name="RoundButton">
        
        <attr name="btn_normalSolidColor" format="color"/>
        
        <attr name="btn_pressedSolidcolor" format="color"/>
        
        <attr name="btn_unableSolidcolor" format="color"/>
        
        <attr name="btn_normalTextcolor" format="color"/>
        
        <attr name="btn_pressedTextcolor" format="color"/>
        
        <attr name="btn_unableTextcolor" format="color"/>

        
        <attr name="btn_normalStrokeColor" format="color"/>
        
        <attr name="btn_pressedStokeColor" format="color"/>
        <attr name="btn_unableStrokeColor" format="color"/>
        
        <attr name="btn_normalStrokeWidth" format="dimension"/>
        
        <attr name="btn_pressedStrokeWidth" format="dimension"/>
        
        <attr name="btn_unableStrokeWidth" format="dimension"/>
        
        <attr name="btnStrokeDashWidth" format="dimension"/>
        
        <attr name="btnStrokeDashGap" format="dimension"/>
        
        <attr name="btnCornerRadius" format="dimension">
            <enum name="stadium" value="-1"/>
        attr>
        
        <attr name="btnPressedRatio" format="float"/>
    declare-styleable>
resources>