工作中用到的图片处理工具类,简单写下来,以便备用!
代码语言:javascript复制public class BitmapUtils {
/**
* 图像背景圆角处理
* bitmap要处理的图片 roundPx 图片弯角的圆度一般是5到10之间
*/
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
// 创建与原图大小一样的bitmap文件,Config.ARGB_8888根据情况可以改用其它的
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
// 实例画布,绘制的bitmap将保存至output中
Canvas canvas = new Canvas(output);
final int color = 0xff424242;//写自己需要的颜色值
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
bitmap.recycle();
bitmap = null;
return output;
}
/**
* bitmap缩放
* width要缩放的宽度 height要缩放的高度
*/
public static Bitmap getBitmapDeflation(Bitmap bitmap, int width, int height, boolean recycle) {
if (null == bitmap) {
return null;
}
float scaleWidth = 0f;
float scaleHeight = 0f;
// 获取bitmap宽高
int bitmapWidth = bitmap.getWidth();
int bitmapHeight = bitmap.getHeight();
// 计算缩放比,图片的宽高小于指定的宽高则不缩放
if (width < bitmapWidth) {
scaleWidth = ((float) width) / bitmapWidth;
} else {
scaleWidth = 1.00f;
}
if (height < bitmapHeight) {
scaleHeight = ((float) height) / bitmapHeight;
} else {
scaleHeight = 1.00f;
}
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, true);
if (recycle && !bitmap.isRecycled()) {
bitmap.recycle();
}
bitmap = null;
return newBitmap;
}
/**
*
* 方法概述:进入图片的大小与质量压缩,用于区分大小图片
*/
public static Bitmap getCompressedImage(String srcPath) {
BitmapFactory.Options newOpts = new BitmapFactory.Options();
// 开始读入图片,此时把options.inJustDecodeBounds 设回true了
newOpts.inPreferredConfig = Bitmap.Config.RGB_565;
newOpts.inPurgeable = true;
newOpts.inJustDecodeBounds = true;
FileInputStream is = null;
try {
is = new FileInputStream(srcPath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
Bitmap bitmap = BitmapFactory.decodeStream(is, null, newOpts);// 此时返回bm为空
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
// 现在主流手机比较多是800*480分辨率,所以高和宽我们设置为
float hh = 130f;// 这里设置高度为800f
float ww = 130f;// 这里设置宽度为480f
// 缩放比。由于是固定比例缩放,只用高或者宽其中一个数据进行计算即可
int be = 1;// be=1表示不缩放
if (w > h && w > ww) {// 如果宽度大的话根据宽度固定大小缩放
be = (int) (newOpts.outWidth / ww);
} else if (w < h && h > hh) {// 如果高度高的话根据宽度固定大小缩放
be = (int) (newOpts.outHeight / hh);
}
if (be <= 0) {
be = 1;
}
newOpts.inSampleSize = be;// 设置缩放比例
// 重新读入图片,注意此时已经把options.inJustDecodeBounds 设回false了
bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
if (bitmap != null) { return compressImageSize(bitmap, 8);// 压缩好比例大小后再进行质量压缩
}
return null;
}
/**
*
* 方法概述:图片质量压缩
*/
protected static Bitmap compressImageSize(Bitmap image, int size) {
if (image == null)
return image;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法,这里10表示不压缩,把压缩后的数据存放到baos中
int options = 100;
while (baos.toByteArray().length / 1000 > size && options / 3 > 0) { // 循环判断如果压缩后图片是否大于10kb,大于继续压缩
baos.reset();// 重置baos即清空baos
image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%,把压缩后的数据存放到baos中
options -= options / 3;// 每次都减少30%
}
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片
return bitmap;
}
/**
*
* 方法概述:保存图片
*/
public static String saveBitmapWithName(String path, String bitName, Bitmap mBitmap) {
File f = new File(path bitName ".png");
String url = path bitName ".png";
try {
f.createNewFile();
} catch (IOException e) {
System.out.println("文件创建出错");
}
FileOutputStream fOut = null;
try {
fOut = new FileOutputStream(f);
} catch (FileNotFoundException e) {
System.out.println(" 创建文件流失败");
e.printStackTrace();
}
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
try {
fOut.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {
fOut.close();
} catch (IOException e) {
e.printStackTrace();
}
return url;
}
/**
*
* 方法概述:根据传入参数保存图片
*/
public static boolean saveImageTo(Bitmap photo, String spath) {
try {
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(spath, false));
photo.compress(Bitmap.CompressFormat.PNG, 100, bos);
bos.flush();
bos.close();
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
}
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