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最近的项目，做图片的另存为功能，需要把图片存成jpg，png，bmp。对于jpg和png来说相对简单，android提供了bitmap.compress（）方法可以马上解决。但是对于BMP这种格式，没有很好的支持。我花了几天时间在网上找了很久，都没有找到有用的答案，同样也发了疑问，没有合适的解答。
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package
com.test.bitmap;
import
java.io.FileNotFoundException;
import
java.io.FileOutputStream;
import
java.io.IOException;
import
android.app.Activity;
import
android.graphics.Bitmap;
import
android.os.Bundle;
import
android.os.Environment;
import
android.view.View;
import
android.view.View.OnClickListener;
import
android.widget.Button;
import
android.widget.ImageView;
public
class
Mainactivity
extends
Activity {
ImageView img;
@Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.sd);
img = (ImageView) findViewById(R.id.img1);
btn.setOnClickListener(
new
OnClickListener() {
@Override
public
void
onClick(View v) {
// TODO Auto-generated method stub
View view = v.getRootView();
view.setDrawingCacheEnabled(
true
);
view.buildDrawingCache();
Bitmap bitmap = view.getDrawingCache();
if
(bitmap !=
null
) {
// ByteArrayOutputStream bos = new ByteArrayOutputStream();
// bitmap.compress(CompressFormat.PNG, 90, bos); 只能转成PNG、JPEG
// byte[] data = bos.toByteArray();
// img.setImageBitmap(BitmapFactory.decodeByteArray(data, 0,
// data.length));
int
w = bitmap.getWidth(), h = bitmap.getHeight();
int
[] pixels=
new
int
[w*h];
bitmap.getPixels(pixels,
0
, w,
0
,
0
, w, h);
// ByteBuffer dst = ByteBuffer.allocate(bitmap.getRowBytes()
// * h);
// bitmap.copyPixelsToBuffer(dst);
// IntBuffer dst=IntBuffer.allocate(w*h);
// bitmap.copyPixelsToBuffer(dst);
byte
[] rgb = addBMP_RGB_888(pixels,w,h);
byte
[] header = addBMPImageHeader(rgb.length);
byte
[] infos = addBMPImageInfosHeader(w, h);
byte
[] buffer =
new
byte
[
54
+ rgb.length];
System.arraycopy(header,
0
, buffer,
0
, header.length);
System.arraycopy(infos,
0
, buffer,
14
, infos.length);
System.arraycopy(rgb,
0
, buffer,
54
, rgb.length);
try
{
FileOutputStream fos =
new
FileOutputStream(Environment
.getExternalStorageDirectory().getPath()
+
"/hello.bmp"
);
fos.write(buffer);
}
catch
(FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch
(IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
}
//BMP文件头
private
byte
[] addBMPImageHeader(
int
size) {
byte
[] buffer =
new
byte
[
14
];
buffer[
0
] =
0x42
;
buffer[
1
] =
0x4D
;
buffer[
2
] = (
byte
) (size >>
0
);
buffer[
3
] = (
byte
) (size >>
8
);
buffer[
4
] = (
byte
) (size >>
16
);
buffer[
5
] = (
byte
) (size >>
24
);
buffer[
6
] =
0x00
;
buffer[
7
] =
0x00
;
buffer[
8
] =
0x00
;
buffer[
9
] =
0x00
;
buffer[
10
] =
0x36
;
buffer[
11
] =
0x00
;
buffer[
12
] =
0x00
;
buffer[
13
] =
0x00
;
return
buffer;
}
//BMP文件信息头
private
byte
[] addBMPImageInfosHeader(
int
w,
int
h) {
byte
[] buffer =
new
byte
[
40
];
buffer[
0
] =
0x28
;
buffer[
1
] =
0x00
;
buffer[
2
] =
0x00
;
buffer[
3
] =
0x00
;
buffer[
4
] = (
byte
) (w >>
0
);
buffer[
5
] = (
byte
) (w >>
8
);
buffer[
6
] = (
byte
) (w >>
16
);
buffer[
7
] = (
byte
) (w >>
24
);
buffer[
8
] = (
byte
) (h >>
0
);
buffer[
9
] = (
byte
) (h >>
8
);
buffer[
10
] = (
byte
) (h >>
16
);
buffer[
11
] = (
byte
) (h >>
24
);
buffer[
12
] =
0x01
;
buffer[
13
] =
0x00
;
buffer[
14
] =
0x18
;
buffer[
15
] =
0x00
;
buffer[
16
] =
0x00
;
buffer[
17
] =
0x00
;
buffer[
18
] =
0x00
;
buffer[
19
] =
0x00
;
buffer[
20
] =
0x00
;
buffer[
21
] =
0x00
;
buffer[
22
] =
0x00
;
buffer[
23
] =
0x00
;
buffer[
24
] = (
byte
)
0xE0
;
buffer[
25
] =
0x01
;
buffer[
26
] =
0x00
;
buffer[
27
] =
0x00
;
buffer[
28
] =
0x02
;
buffer[
29
] =
0x03
;
buffer[
30
] =
0x00
;
buffer[
31
] =
0x00
;
buffer[
32
] =
0x00
;
buffer[
33
] =
0x00
;
buffer[
34
] =
0x00
;
buffer[
35
] =
0x00
;
buffer[
36
] =
0x00
;
buffer[
37
] =
0x00
;
buffer[
38
] =
0x00
;
buffer[
39
] =
0x00
;
return
buffer;
}
private
byte
[] addBMP_RGB_888(
int
[] b,
int
w,
int
h) {
int
len = b.length;
System.out.println(b.length);
byte
[] buffer =
new
byte
[w*h *
3
];
int
offset=
0
;
for
(
int
i = len-
1
; i>=w; i-=w) {
//DIB文件格式最后一行为第一行，每行按从左到右顺序
int
end=i,start=i-w+
1
;
for
(
int
j=start;j |