【Android】Bitmap、InputStream、Drawable、byte[]、Base64之间的相互转换

// 将Bitmap转换成InputStream(压缩率quality、100表示不压缩、10表示压缩90%)
public InputStream Bitmap2InputStream(Bitmap bm, int quality) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, quality, baos);
InputStream is = new ByteArrayInputStream(baos.toByteArray());
return is;
}

// 将Bitmap转换成InputStream
public InputStream Bitmap2InputStream(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
InputStream is = new ByteArrayInputStream(baos.toByteArray());
return is;
}

// 将InputStream转换成Bitmap
public Bitmap InputStream2Bitmap(InputStream is) {
return BitmapFactory.decodeStream(is);
}

// Drawable转换成InputStream
public InputStream Drawable2InputStream(Drawable d) {
Bitmap bitmap = this.drawable2Bitmap(d);
return this.Bitmap2InputStream(bitmap);
}

// InputStream转换成Drawable
public Drawable InputStream2Drawable(InputStream is) {
Bitmap bitmap = this.InputStream2Bitmap(is);
return this.bitmap2Drawable(bitmap);
}

// Drawable转换成byte[]
public byte[] Drawable2Bytes(Drawable d) {
Bitmap bitmap = this.drawable2Bitmap(d);
return this.Bitmap2Bytes(bitmap);
}

// byte[]转换成Drawable
public Drawable Bytes2Drawable(byte[] b) {
Bitmap bitmap = this.Bytes2Bitmap(b);
return this.bitmap2Drawable(bitmap);
}

// Bitmap转换成byte[]
public byte[] Bitmap2Bytes(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}

// byte[]转换成Bitmap
public Bitmap Bytes2Bitmap(byte[] b) {
if (b.length !=   0) {
return BitmapFactory.decodeByteArray(b,   0, b.length);
}
return null;
}

// 将byte[]转换成InputStream
public InputStream Byte2InputStream(byte[] b) {
ByteArrayInputStream bais = new ByteArrayInputStream(b);
return bais;
}

// 将InputStream转换成byte[]
public byte[] InputStream2Bytes(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();
}
return str.getBytes();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

// Drawable转换成Bitmap
public Bitmap drawable2Bitmap(Drawable drawable) {
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(), drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(  0,   0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}

// Bitmap转换成Drawable
public Drawable bitmap2Drawable(Bitmap bitmap) {
BitmapDrawable bd = new BitmapDrawable(bitmap);
Drawable d = (Drawable) bd;
return d;
}

//将Bitmap转换成Base64
public  String getImgStr(Bitmap bit){
ByteArrayOutputStream bos=new ByteArrayOutputStream();
bit.compress(CompressFormat.JPEG,  100, bos);//参数100表示不压缩
byte[] bytes=bos.toByteArray();
return Base64.encodeToString(bytes, Base64.DEFAULT);
}

//将Base64转换成bitmap
public  Bitmap getimg(String str){
byte[] bytes;
bytes=Base64.decode(str,   0);
return BitmapFactory.decodeByteArray(bytes,   0, bytes.length);
}