根据文本生成位图

public final class BitmapUtil {

private static Map hangyesIconCacheMap = new HashMap();

/**
* 根据文本生成行业标识位图
* */
public static Bitmap drawTextToBitmapForHangyeIcon(Context context,String text) {

Bitmap hangyesIconBitmap = hangyesIconCacheMap.get(text);
if (hangyesIconBitmap!=null) {
return hangyesIconBitmap;
}
if (context==null) {
throw new NullPointerException("context is null");
}
Resources res = context.getResources();
NinePatchDrawable npDrawable = (NinePatchDrawable) res.getDrawable(R.drawable.bangyibang_hangyebg);
float scale = res.getDisplayMetrics().density;
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(res.getColor(R.color.bangyibang_textcolor_lightyellow));
paint.setTextSize((int) (15 * scale));
paint.setDither(true); // 获取跟清晰的图像采样
paint.setFilterBitmap(true);// 过滤一些
Rect bounds = new Rect();
paint.getTextBounds(text, 0, text.length(), bounds);
int c = (int) (5*scale);
int bwidth = (int)(bounds.width()+c*2);
int bheight = (int)(bounds.height()+c*2);
npDrawable.setBounds(0, 0, bwidth, bheight);
Bitmap bitmap = Bitmap.createBitmap(bwidth, bheight, android.graphics.Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
npDrawable.draw(canvas);

paint.setTextAlign(Paint.Align.CENTER);
canvas.drawText(text, bitmap.getWidth()/2-0.5f, bitmap.getHeight()/2+bounds.height()/2-bounds.bottom, paint);
//showMessage(bounds.top+","+bounds.height()+","+bounds.bottom);

hangyesIconCacheMap.put(text, bitmap);

return bitmap;

}

public static void clearHangyesIconCache(){
hangyesIconCacheMap.clear();
}
}

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