可设置圆角背景边框的按钮, 通过调节色彩明度自动计算按下(pressed)状态颜色

可设置圆角背景边框的的按钮, 通过调节色彩明度自动计算按下(pressed)状态颜色



使用：
xml

<?xml version="1.0" encoding="UTF-8"?><LinearLayout android:paddingTop="20dp" android:orientation="vertical" android:layout_height="match_parent" android:layout_width="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:android="http://schemas.android.com/apk/res/android"><LinearLayout android:orientation="horizontal" android:layout_height="wrap_content" android:layout_width="match_parent"><com.github.czy1121.view.RoundButton app:btnSolidColor="#3F51B5" app:btnPressedRatio="0.8" app:btnCornerRadius="10dp" android:text="Text" style="@style/RoundButton"/><com.github.czy1121.view.RoundButton app:btnSolidColor="#9C27B0" app:btnPressedRatio="0.8" app:btnCornerRadius="stadium" android:text="Text" style="@style/RoundButton"/><com.github.czy1121.view.RoundButton app:btnSolidColor="#03A9F4" app:btnPressedRatio="0.8" app:btnCornerRadius="stadium" android:text="Text" style="@style/RoundButton"/><com.github.czy1121.view.RoundButton app:btnSolidColor="#4CAF50" app:btnPressedRatio="0.9" app:btnCornerRadius="10dp" android:text="Text" style="@style/RoundButton" android:enabled="false"/><com.github.czy1121.view.RoundButton android:layout_height="50dp" android:layout_width="50dp" app:btnSolidColor="@color/bg" app:btnPressedRatio="0.9" app:btnCornerRadius="stadium" android:text="Text" style="@style/RoundButton" android:layout_weight="0"/></LinearLayout><LinearLayout android:orientation="horizontal" android:layout_height="wrap_content" android:layout_width="match_parent" android:background="#CDDC39"><com.github.czy1121.view.RoundButton app:btnPressedRatio="1.5" app:btnCornerRadius="10dp" android:text="Text" style="@style/RoundButton.Two" app:btnStrokeColor="#3F51B5" android:textColor="#3F51B5"/><com.github.czy1121.view.RoundButton app:btnPressedRatio="0.5" app:btnCornerRadius="stadium" android:text="Text" style="@style/RoundButton.Two" app:btnStrokeColor="#9C27B0" android:textColor="#9C27B0" app:btnStrokeDashWidth="6dp" app:btnStrokeDashGap="3dp"/><com.github.czy1121.view.RoundButton app:btnPressedRatio="0.9" app:btnCornerRadius="stadium" android:text="Text" style="@style/RoundButton.Two" app:btnStrokeColor="#03A9F4" android:textColor="#03A9F4"/><com.github.czy1121.view.RoundButton app:btnPressedRatio="0.9" app:btnCornerRadius="10dp" android:text="Text" style="@style/RoundButton.Two" app:btnStrokeColor="#4CAF50" android:textColor="#4CAF50"/></LinearLayout></LinearLayout>

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.GradientDrawable;import android.util.AttributeSet;import android.view.Gravity;import android.widget.TextView;import com.github.czy1121.roundbutton.R;public final class RoundButton extends TextView {    public RoundButton(Context context) {        this(context, null);    }    public RoundButton(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public RoundButton(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.RoundButton);        float pressedRatio = a.getFloat(R.styleable.RoundButton_btnPressedRatio, 0.80f);        int cornerRadius = a.getLayoutDimension(R.styleable.RoundButton_btnCornerRadius, 0);        ColorStateList solidColor = a.getColorStateList(R.styleable.RoundButton_btnSolidColor);        int strokeColor = a.getColor(R.styleable.RoundButton_btnStrokeColor, 0x0);        int strokeWidth = a.getDimensionPixelSize(R.styleable.RoundButton_btnStrokeWidth, 0);        int strokeDashWidth = a.getDimensionPixelSize(R.styleable.RoundButton_btnStrokeDashWidth, 0);        int strokeDashGap = a.getDimensionPixelSize(R.styleable.RoundButton_btnStrokeDashGap, 0);        a.recycle();        setSingleLine(true);        setGravity(Gravity.CENTER);        RoundDrawable rd = new RoundDrawable(cornerRadius == -1);        rd.setCornerRadius(cornerRadius == -1 ? 0 : cornerRadius);        rd.setStroke(strokeWidth, strokeColor, strokeDashWidth, strokeDashGap);        if (solidColor == null) {            solidColor = ColorStateList.valueOf(0);        }        if (solidColor.isStateful()) {            rd.setSolidColors(solidColor);        } else if (pressedRatio > 0.0001f) {            rd.setSolidColors(csl(solidColor.getDefaultColor(), pressedRatio));        } else {            rd.setColor(solidColor.getDefaultColor());        }        setBackground(rd);    }    // 灰度    int greyer(int color) {        int blue = (color & 0x000000FF) >> 0;        int green = (color & 0x0000FF00) >> 8;        int red = (color & 0x00FF0000) >> 16;        int grey = Math.round(red * 0.299f + green * 0.587f + blue * 0.114f);        return Color.argb(0xff, grey, grey, grey);    }    // 明度    int darker(int color, float ratio) {        color = (color >> 24) == 0 ? 0x22808080 : color;        float[] hsv = new float[3];        Color.colorToHSV(color, hsv);        hsv[2] *= ratio;        return Color.HSVToColor(color >> 24, hsv);    }    ColorStateList csl(int normal, float ratio) {        //        int disabled = greyer(normal);        int pressed = darker(normal, ratio);        int[][] states = new int[][]{{android.R.attr.state_pressed}, {}};        int[] colors = new int[]{pressed, normal};        return new ColorStateList(states, colors);    }    private static class RoundDrawable extends GradientDrawable {        private boolean mIsStadium = false;        private ColorStateList mSolidColors;        private int mFillColor;        public RoundDrawable(boolean isStadium) {            mIsStadium = isStadium;        }        public void setSolidColors(ColorStateList colors) {            mSolidColors = colors;            setColor(colors.getDefaultColor());        }        @Override        protected void onBoundsChange(Rect bounds) {            super.onBoundsChange(bounds);            if (mIsStadium) {                RectF rect = new RectF(getBounds());                setCornerRadius((rect.height() > rect.width() ? rect.width() : rect.height()) / 2);            }        }        @Override        public void setColor(int argb) {            mFillColor = argb;            super.setColor(argb);        }        @Override        protected boolean onStateChange(int[] stateSet) {            if (mSolidColors != null) {                final int newColor = mSolidColors.getColorForState(stateSet, 0);                if (mFillColor != newColor) {                    setColor(newColor);                    return true;                }            }            return false;        }        @Override        public boolean isStateful() {            return super.isStateful() || (mSolidColors != null && mSolidColors.isStateful());        }    }}

<declare-styleable name="RoundButton"><!-- 背景色 --><attr name="btnSolidColor" format="color"/><!-- 边框色 --><attr name="btnStrokeColor" format="color"/><!-- 边框厚度 --><attr name="btnStrokeWidth" 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>

https://github.com/czy1121/roundbutton