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ChangeColorIconWithText.java
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195 lines (172 loc) · 4.95 KB
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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();
}
}
}