Android Socket Method of Transferring Pictures Between Server and Client by String

  • 2021-07-09 09:18:35
  • OfStack

Send pictures:

First, find the specific transmitted picture:


<span style="font-family: comic sans ms,sans-serif; font-size: 16px;">private Bitmap getimage(String srcPath) {
BitmapFactory.Options newOpts = new BitmapFactory.Options();
//  Start reading the picture. At this time, put options.inJustDecodeBounds  Set back true It's over 
newOpts.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);//  Return at this time bm Empty 
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
//  Now there are more mainstream mobile phones 800*480 Resolution, so we set the height and width to 
float hh = 100f;//  Set the height here to 800f
float ww = 100f;//  Here, the width is set to 480f
//  Scaling ratio. Because it is a fixed scale, it is only high or wide 1 Data can be calculated 
int be = 1;// be=1 Indicates non-scaling 
if (w > h && w > ww) {//  If the width is large, scale according to the fixed size of the width 
be = (int) (newOpts.outWidth / ww);
} else if (w < h && h > hh) {//  If the height is high, it will be scaled according to the fixed size of the width 
be = (int) (newOpts.outHeight / hh);
}
if (be <= 0)
be = 1;
newOpts.inSampleSize = be;//  Set the scale 
//  Re-read the picture, notice that the options.inJustDecodeBounds  Set back false It's over 
bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
return compressImage(bitmap);//  After compressing the proportion, mass compression is carried out 
}
</span> 

The following method is the method of compressing pictures


<span style="font-family: comic sans ms,sans-serif; font-size: px;">private Bitmap compressImage(Bitmap image) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, , baos);//  Quality compression method, which means not compressing, stores the compressed data to baos Medium 
int options = ;
while (baos.toByteArray().length / > ) { //  Loop to judge if the compressed picture is larger than kb, Greater than Continue Compression 
baos.reset();//  Reset baos Empty baos
image.compress(Bitmap.CompressFormat.JPEG, options, baos);//  Compress here options% The compressed data is stored in the baos Medium 
options -= ;//  Decrease every time 
}
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//  Put the compressed data baos Deposit to ByteArrayInputStream Medium 
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//  Put ByteArrayInputStream Data generation picture 
return bitmap;
}
</span> 

Convert bitmap to byte [] Array


<span style="font-family: comic sans ms,sans-serif; font-size: 16px;">public byte[] Bitmap2Bytes(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
</span> 

Formatting byte into Strings


<span style="font-family: comic sans ms,sans-serif; font-size: px;">/**
*  Formatting byte
* 
* @param b
* @return
*/
public static String bytehex(byte[] b) {
char[] Digit = { '', '', '', '', '', '', '', '', '', '', 'A',
'B', 'C', 'D', 'E', 'F' };
char[] out = new char[b.length * ];
for (int i = ; i < b.length; i++) {
byte c = b[i];
out[i * ] = Digit[(c >>> ) & XF];
out[i * + ] = Digit[c & XF];
}
return new String(out);
}
</span>

Receive pictures:

First convert the passed String into an byte [] array:


<span style="font-family: comic sans ms,sans-serif; font-size: px;">/**
*  Inversion formatting byte
* 
* @param s
* @return
*/
public static byte[] hexbyte(String s) {
byte[] src = s.toLowerCase().getBytes();
byte[] ret = new byte[src.length / ];
for (int i = ; i < src.length; i += ) {
byte hi = src[i];
byte low = src[i + ];
hi = (byte) ((hi >= 'a' && hi <= 'f') ? xa + (hi - 'a')
: hi - '');
low = (byte) ((low >= 'a' && low <= 'f') ? xa + (low - 'a')
: low - '');
ret[i / ] = (byte) (hi << | low);
}
return ret;
}
</span> 

Convert byte [] to bitmap:


<span style="font-family: comic sans ms,sans-serif; font-size: px;">public Bitmap BytesBimap(byte[] b) {
if (b.length != ) {
return BitmapFactory.decodeByteArray(b, , b.length);
} else {
return null;
}
}
</span> 

Use the setImageBitmap method in android to display the received pictures to the mobile phone.


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