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package com.electronic_market;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.Bitmap;

import android.graphics.Bitmap.Config;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.PorterDuff;

import android.graphics.PorterDuffXfermode;

import android.graphics.Rect;

import android.graphics.drawable.BitmapDrawable;

import android.os.Looper;

import android.util.AttributeSet;

import android.util.TypedValue;

import android.view.View;

public class ChangeColorIconWithText extends View

{

//点击图标后的颜色

private int mColor;

private Bitmap mIconBitmap;

//图标下部文本

private String mText ;

//文本大小

private int mTextSize ;

private Canvas mCanvas;

private Bitmap mBitmap;

private Paint mPaint;

//透明度0～1

private float mAlpha;

//图标位置

private Rect mIconRect;

//文本位置

private Rect mTextBound;

private Paint mTextPaint;

public ChangeColorIconWithText(Context context)

{

this(context, null);

}

public ChangeColorIconWithText(Context context, AttributeSet attrs)

{

this(context, attrs, 0);

}

/**

* 获取自定义属性的值

* @param context

* @param attrs

* @param defStyleAttr

*/

public ChangeColorIconWithText(Context context, AttributeSet attrs,

int defStyleAttr)

{

super(context, attrs, defStyleAttr);

TypedArray a = context.obtainStyledAttributes(attrs,

R.styleable.ChangeColorIconWithText);

int n = a.getIndexCount();

for (int i = 0; i < n; i++)

{

int attr = a.getIndex(i);

switch (attr)

{

case R.styleable.ChangeColorIconWithText_icon:

BitmapDrawable drawable = (BitmapDrawable) a.getDrawable(attr);

mIconBitmap = drawable.getBitmap();

break;

case R.styleable.ChangeColorIconWithText_color:

mColor = a.getColor(attr, 0xFFFF6633);

break;

case R.styleable.ChangeColorIconWithText_text:

mText = a.getString(attr);

break;

case R.styleable.ChangeColorIconWithText_text_size:

mTextSize = (int) a.getDimension(attr, TypedValue

.applyDimension(TypedValue.COMPLEX_UNIT_SP, 15,

getResources().getDisplayMetrics()));

break;

}

}

a.recycle();

mTextBound = new Rect();

mTextPaint = new Paint();

mTextPaint.setTextSize(mTextSize);

mTextPaint.setColor(0xff333333);

mTextPaint.getTextBounds(mText, 0, mText.length(), mTextBound);

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)

{

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

int iconWidth = Math.min(getMeasuredWidth() - getPaddingLeft()

- getPaddingRight(), getMeasuredHeight() - getPaddingTop()

- getPaddingBottom() - mTextBound.height());

int left = getMeasuredWidth() / 2 - iconWidth / 2;

int top = getMeasuredHeight() / 2 - (mTextBound.height() + iconWidth)

/ 2;

mIconRect = new Rect(left, top, left + iconWidth, top + iconWidth);

}

@Override

protected void onDraw(Canvas canvas)

{

canvas.drawBitmap(mIconBitmap, null, mIconRect, null);

int alpha = (int) Math.ceil(255 * mAlpha);

// 内存去准备mBitmap , setAlpha , 纯色 ，xfermode ， 图标

setupTargetBitmap(alpha);

// 绘制原文本 绘制变色的文本

drawSourceText(canvas, alpha);

//绘制变色的文本

drawTargetText(canvas, alpha);

canvas.drawBitmap(mBitmap, 0, 0, null);

}

/**

* 绘制变色的文本

* @param canvas

* @param alpha

*/

private void drawTargetText(Canvas canvas, int alpha)

{

mTextPaint.setColor(mColor);

mTextPaint.setAlpha(alpha);

int x = getMeasuredWidth() / 2 - mTextBound.width() / 2;

int y = mIconRect.bottom + mTextBound.height();

canvas.drawText(mText, x, y, mTextPaint);

}

/**

* 绘制原文本

* @param canvas

* @param alpha

*/

private void drawSourceText(Canvas canvas, int alpha)

{

mTextPaint.setColor(0xff333333);

mTextPaint.setAlpha(255 - alpha);

int x = getMeasuredWidth() / 2 - mTextBound.width() / 2;

int y = mIconRect.bottom + mTextBound.height();

canvas.drawText(mText, x, y, mTextPaint);

}

/**

* 在内存中绘制可变色的Icon

*/

private void setupTargetBitmap(int alpha)

{

mBitmap = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(),

Config.ARGB_8888);

mCanvas = new Canvas(mBitmap);

mPaint = new Paint();

mPaint.setColor(mColor);

mPaint.setAntiAlias(true);

mPaint.setDither(true);

mPaint.setAlpha(alpha);

mCanvas.drawRect(mIconRect, mPaint);

mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));

mPaint.setAlpha(255);

mCanvas.drawBitmap(mIconBitmap, null, mIconRect, mPaint);

}

public void setIconAlpha(float alpha)

{

this.mAlpha = alpha;

invalidateView();

}

/**

* 重绘

*/

private void invalidateView()

{

if (Looper.getMainLooper() == Looper.myLooper())

{

invalidate();

} else

{

postInvalidate();

}

}

}