Bitmap,byte[],Drawable，InputStream相互转化工具类

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1、将byte[]转换成InputStream

byte[] b;

ByteArrayInputStream bais = new ByteArrayInputStream(b);

2、将InputStream转换成byte[]

(1)

InputStream inStream;

ByteArrayOutputStream swapStream = new ByteArrayOutputStream();

byte[] buff = new byte[100];

int rc = 0;

try {

while ((rc = inStream.read(buff, 0, 100)) > 0) {

swapStream.write(buff, 0, rc);

}

} catch (IOException e) {

e.printStackTrace();

}

byte[] in2b = swapStream.toByteArray();

(2)

InputStream is;

String str = "";

byte[] readByte = new byte[1024];

int readCount = -1;

try {

while ((readCount = is.read(readByte, 0, 1024)) != -1) {

str += new String(readByte).trim();

} catch (Exception e) {

e.printStackTrace();

}

byte[] in2b = str.getBytes();

3、 Bitmap转换成byte[]

Bitmap bm;

ByteArrayOutputStream baos = new ByteArrayOutputStream();

bm.compress(Bitmap.CompressFormat.PNG, 100, baos);

byte[] b = baos.toByteArray();

4、 byte[]转换成Bitmap

byte[] b;

if (b.length != 0)

Bitmap bm = BitmapFactory.decodeByteArray(b, 0, b.length);

5、Drawable转换成Bitmap

Drawable drawable;

Bitmap bitmap = Bitmap

.createBitmap(

drawable.getIntrinsicWidth(),

drawable.getIntrinsicHeight(),

drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

: Bitmap.Config.RGB_565);

6、 Bitmap转换成Drawable

Bitmap bitmap;

BitmapDrawable bd = new BitmapDrawable(bitmap);

Drawable d = (Drawable) bd;

7、将Bitmap转换成InputStream

Bitmap bm;

ByteArrayOutputStream baos = new ByteArrayOutputStream();

InputStream is = new ByteArrayInputStream(baos.toByteArray());

8、将InputStream转换成Bitmap

InputStream is;

Bitmap bm = BitmapFactory.decodeStream(is);

9、 Drawable转换成InputStream

Drawable d;

//先把drawable转换成Bitmap

//再把Bitmap 转换成 InputStream

10、 InputStream转换成Drawable

InputStream is;

//先把InputStream 转换成 Bitmap

//再把Bitmap 转换成 Drawable

11、 Drawable转换成byte[]

Drawable d;

//先把Drawable 转换成 Bitmap

//再把Bitmap 转换成 byte[]

12、 byte[]转换成Drawable

byte[] b;

//先把byte[] 转换成 Bitmap

//再把Bitmap 转换成 Drawable

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