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//质量压缩 | |
private Bitmap compressImage(Bitmap image) { | |
ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法,这里100表示不压缩,把压缩后的数据存放到baos中 | |
int options = 100; | |
while ( baos.toByteArray().length / 1024>100) { //循环判断如果压缩后图片是否大于100kb,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 -= 10;//每次都减少10 | |
} | |
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; | |
} | |
//图片按比例大小压缩方法(根据路径获取图片并压缩): | |
private Bitmap getimage(String srcPath) { | |
BitmapFactory.Options newOpts = new BitmapFactory.Options(); | |
//开始读入图片,此时把options.inJustDecodeBounds 设回true了 | |
newOpts.inJustDecodeBounds = true; | |
Bitmap bitmap = BitmapFactory.decodeFile(srcPath,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 = 800f;//这里设置高度为800f | |
float ww = 480f;//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); | |
return compressImage(bitmap);//压缩好比例大小后再进行质量压缩 | |
} | |
//图片按比例大小压缩方法(根据Bitmap图片压缩): | |
private Bitmap comp(Bitmap image) { | |
ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
image.compress(Bitmap.CompressFormat.JPEG, 100, baos); | |
if( baos.toByteArray().length / 1024>1024) {//判断如果图片大于1M,进行压缩避免在生成图片(BitmapFactory.decodeStream)时溢出 | |
baos.reset();//重置baos即清空baos | |
image.compress(Bitmap.CompressFormat.JPEG, 50, baos);//这里压缩50%,把压缩后的数据存放到baos中 | |
} | |
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray()); | |
BitmapFactory.Options newOpts = new BitmapFactory.Options(); | |
//开始读入图片,此时把options.inJustDecodeBounds 设回true了 | |
newOpts.inJustDecodeBounds = true; | |
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts); | |
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 = 800f;//这里设置高度为800f | |
float ww = 480f;//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 | |
isBm = new ByteArrayInputStream(baos.toByteArray()); | |
bitmap = BitmapFactory.decodeStream(isBm, null, newOpts); | |
return compressImage(bitmap);//压缩好比例大小后再进行质量压缩 | |
} |
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