Bitmap returning null when initialised with byte array
0
I have Bitmap that I'm assigning a byte array value, using code:
public class LegacyCameraManager implements Camera.ErrorCallback, Camera.PreviewCallback, Camera.AutoFocusCallback, Camera.PictureCallback {
public static Bitmap mBitmap;
@Override
public void onPreviewFrame(byte bytes, Camera camera) {
Boolean isProcessing = UserSharedPref.initializeSharedPreferencesForprocessFrames(mContext).getBoolean(UserSharedPref.processFrames, true);
if (isProcessing) {
Log.d("TEST:","length of bytes:"+bytes.length);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
mBitmap = BitmapFactory.decodeByteArray(bytes,0,bytes.length,options);
Log.d("TEST:","The bitmap:"+mBitmap);
tfDetector.onPreviewFrame(bytes, camera);
}
}
The rest of the code works well and this method gets called continuously like it should, the thing is mBitmap is logging out as "null" always and this variable has to be set to an imageview like this,onclikc of a button like this:
if (LegacyCameraManager.mBitmap == null) {
Log.d("TEST:","Bitmaps is NULL!!");
img.setImageResource(R.drawable.office);
} else {
img.setImageBitmap(Bitmap.createScaledBitmap(LegacyCameraManager.mBitmap, img.getWidth(),
img.getHeight(), false));
}
The Logcat (a lot of number of times like it should):
length of bytes:460800
The bitmap:null
And therefore, the image is not getting set to the bitmap being null, the actual function is to set the image view to a picture taken at the instant which will happen of the bitmap is assigned like it is supposed to. Where am I going wrong?
java
android arrays android-bitmap asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
add a comment |
0
I have Bitmap that I'm assigning a byte array value, using code:
public class LegacyCameraManager implements Camera.ErrorCallback, Camera.PreviewCallback, Camera.AutoFocusCallback, Camera.PictureCallback {
public static Bitmap mBitmap;
@Override
public void onPreviewFrame(byte bytes, Camera camera) {
Boolean isProcessing = UserSharedPref.initializeSharedPreferencesForprocessFrames(mContext).getBoolean(UserSharedPref.processFrames, true);
if (isProcessing) {
Log.d("TEST:","length of bytes:"+bytes.length);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
mBitmap = BitmapFactory.decodeByteArray(bytes,0,bytes.length,options);
Log.d("TEST:","The bitmap:"+mBitmap);
tfDetector.onPreviewFrame(bytes, camera);
}
}
The rest of the code works well and this method gets called continuously like it should, the thing is mBitmap is logging out as "null" always and this variable has to be set to an imageview like this,onclikc of a button like this:
if (LegacyCameraManager.mBitmap == null) {
Log.d("TEST:","Bitmaps is NULL!!");
img.setImageResource(R.drawable.office);
} else {
img.setImageBitmap(Bitmap.createScaledBitmap(LegacyCameraManager.mBitmap, img.getWidth(),
img.getHeight(), false));
}
The Logcat (a lot of number of times like it should):
length of bytes:460800
The bitmap:null
And therefore, the image is not getting set to the bitmap being null, the actual function is to set the image view to a picture taken at the instant which will happen of the bitmap is assigned like it is supposed to. Where am I going wrong?
java
android arrays android-bitmap asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
I would recommend try to not provide any option into the decodeByteArray.
– Ivan
Nov 13 '18 at 11:30
yes, tried without the option as well....same.....null
– Sonic_
Nov 13 '18 at 11:32
ifonPreviewFrame(byte data, Camera camera)is from camera.previewCallback, then you have to convert thosebyte datato yuv then to bitmap check this link stackoverflow.com/questions/4768165/…
– d.gjinovci
Nov 13 '18 at 12:00
decodeByteArray()takes a compressed image (.jpg, .png, etc.). The frames passed toonPreviewFrame()are not compressed; they are simply in a different format (whatever format you specified when setting up the capture).
– greeble31
Nov 13 '18 at 20:16
Hey, thanks a lot @d.gjinovci your suggestion worked for me.
– Sonic_
Nov 14 '18 at 6:48
add a comment |
0
0
0
I have Bitmap that I'm assigning a byte array value, using code:
public class LegacyCameraManager implements Camera.ErrorCallback, Camera.PreviewCallback, Camera.AutoFocusCallback, Camera.PictureCallback {
public static Bitmap mBitmap;
@Override
public void onPreviewFrame(byte bytes, Camera camera) {
Boolean isProcessing = UserSharedPref.initializeSharedPreferencesForprocessFrames(mContext).getBoolean(UserSharedPref.processFrames, true);
if (isProcessing) {
Log.d("TEST:","length of bytes:"+bytes.length);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
mBitmap = BitmapFactory.decodeByteArray(bytes,0,bytes.length,options);
Log.d("TEST:","The bitmap:"+mBitmap);
tfDetector.onPreviewFrame(bytes, camera);
}
}
The rest of the code works well and this method gets called continuously like it should, the thing is mBitmap is logging out as "null" always and this variable has to be set to an imageview like this,onclikc of a button like this:
if (LegacyCameraManager.mBitmap == null) {
Log.d("TEST:","Bitmaps is NULL!!");
img.setImageResource(R.drawable.office);
} else {
img.setImageBitmap(Bitmap.createScaledBitmap(LegacyCameraManager.mBitmap, img.getWidth(),
img.getHeight(), false));
}
The Logcat (a lot of number of times like it should):
length of bytes:460800
The bitmap:null
And therefore, the image is not getting set to the bitmap being null, the actual function is to set the image view to a picture taken at the instant which will happen of the bitmap is assigned like it is supposed to. Where am I going wrong?
java
android arrays android-bitmap asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
I have Bitmap that I'm assigning a byte array value, using code:
public class LegacyCameraManager implements Camera.ErrorCallback, Camera.PreviewCallback, Camera.AutoFocusCallback, Camera.PictureCallback {
public static Bitmap mBitmap;
@Override
public void onPreviewFrame(byte bytes, Camera camera) {
Boolean isProcessing = UserSharedPref.initializeSharedPreferencesForprocessFrames(mContext).getBoolean(UserSharedPref.processFrames, true);
if (isProcessing) {
Log.d("TEST:","length of bytes:"+bytes.length);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
mBitmap = BitmapFactory.decodeByteArray(bytes,0,bytes.length,options);
Log.d("TEST:","The bitmap:"+mBitmap);
tfDetector.onPreviewFrame(bytes, camera);
}
}
The rest of the code works well and this method gets called continuously like it should, the thing is mBitmap is logging out as "null" always and this variable has to be set to an imageview like this,onclikc of a button like this:
if (LegacyCameraManager.mBitmap == null) {
Log.d("TEST:","Bitmaps is NULL!!");
img.setImageResource(R.drawable.office);
} else {
img.setImageBitmap(Bitmap.createScaledBitmap(LegacyCameraManager.mBitmap, img.getWidth(),
img.getHeight(), false));
}
The Logcat (a lot of number of times like it should):
length of bytes:460800
The bitmap:null
And therefore, the image is not getting set to the bitmap being null, the actual function is to set the image view to a picture taken at the instant which will happen of the bitmap is assigned like it is supposed to. Where am I going wrong?
java
android arrays android-bitmap java
android arrays android-bitmap asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
edited Nov 13 '18 at 11:33
Sonic_
asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
asked Nov 13 '18 at 11:07
Sonic_Sonic_
3617
3617
I would recommend try to not provide any option into the decodeByteArray.
– Ivan
Nov 13 '18 at 11:30
yes, tried without the option as well....same.....null
– Sonic_
Nov 13 '18 at 11:32
ifonPreviewFrame(byte data, Camera camera)is from camera.previewCallback, then you have to convert thosebyte datato yuv then to bitmap check this link stackoverflow.com/questions/4768165/…
– d.gjinovci
Nov 13 '18 at 12:00
decodeByteArray()takes a compressed image (.jpg, .png, etc.). The frames passed toonPreviewFrame()are not compressed; they are simply in a different format (whatever format you specified when setting up the capture).
– greeble31
Nov 13 '18 at 20:16
Hey, thanks a lot @d.gjinovci your suggestion worked for me.
– Sonic_
Nov 14 '18 at 6:48
add a comment |
I would recommend try to not provide any option into the decodeByteArray.
– Ivan
Nov 13 '18 at 11:30
yes, tried without the option as well....same.....null
– Sonic_
Nov 13 '18 at 11:32
ifonPreviewFrame(byte data, Camera camera)is from camera.previewCallback, then you have to convert thosebyte datato yuv then to bitmap check this link stackoverflow.com/questions/4768165/…
– d.gjinovci
Nov 13 '18 at 12:00
decodeByteArray()takes a compressed image (.jpg, .png, etc.). The frames passed toonPreviewFrame()are not compressed; they are simply in a different format (whatever format you specified when setting up the capture).
– greeble31
Nov 13 '18 at 20:16
Hey, thanks a lot @d.gjinovci your suggestion worked for me.
– Sonic_
Nov 14 '18 at 6:48
I would recommend try to not provide any option into the decodeByteArray.
– Ivan
Nov 13 '18 at 11:30
I would recommend try to not provide any option into the decodeByteArray.
– Ivan
Nov 13 '18 at 11:30
yes, tried without the option as well....same.....null
– Sonic_
Nov 13 '18 at 11:32
yes, tried without the option as well....same.....null
– Sonic_
Nov 13 '18 at 11:32
if
onPreviewFrame(byte data, Camera camera) is from camera.previewCallback, then you have to convert those byte data to yuv then to bitmap check this link stackoverflow.com/questions/4768165/…– d.gjinovci
Nov 13 '18 at 12:00
if
onPreviewFrame(byte data, Camera camera) is from camera.previewCallback, then you have to convert those byte data to yuv then to bitmap check this link stackoverflow.com/questions/4768165/…– d.gjinovci
Nov 13 '18 at 12:00
decodeByteArray() takes a compressed image (.jpg, .png, etc.). The frames passed to onPreviewFrame() are not compressed; they are simply in a different format (whatever format you specified when setting up the capture).– greeble31
Nov 13 '18 at 20:16
decodeByteArray() takes a compressed image (.jpg, .png, etc.). The frames passed to onPreviewFrame() are not compressed; they are simply in a different format (whatever format you specified when setting up the capture).– greeble31
Nov 13 '18 at 20:16
Hey, thanks a lot @d.gjinovci your suggestion worked for me.
– Sonic_
Nov 14 '18 at 6:48
Hey, thanks a lot @d.gjinovci your suggestion worked for me.
– Sonic_
Nov 14 '18 at 6:48
add a comment |
1 Answer
1
active
oldest
votes
-1
Just try this:
Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata, 0, bitmapdata.length);
Returns the decoded Bitmap, or null if the image could not be decoded.
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
"mBitmap" has to be a global variable. As it is also being used by another activity. It cant be a local object.
– Sonic_
Nov 13 '18 at 11:44
Local or Public that's not your problem. I think you should learn basic of java like Access Modifier. Thanks
– Sultan Mahmud
Nov 13 '18 at 11:47
It's a static variable what's wrong with it?
– Sonic_
Nov 13 '18 at 11:54
This does not address the basic problem: That the input format is not compressed, and therefordecodeByteArray()is not appropriate to begin with.
– greeble31
Nov 13 '18 at 20:23
opps. I overlooked that thing. ok Then try this: ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray); Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
– Sultan Mahmud
Nov 13 '18 at 20:31
|
show 1 more comment
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1 Answer
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1 Answer
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-1
Just try this:
Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata, 0, bitmapdata.length);
Returns the decoded Bitmap, or null if the image could not be decoded.
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
"mBitmap" has to be a global variable. As it is also being used by another activity. It cant be a local object.
– Sonic_
Nov 13 '18 at 11:44
Local or Public that's not your problem. I think you should learn basic of java like Access Modifier. Thanks
– Sultan Mahmud
Nov 13 '18 at 11:47
It's a static variable what's wrong with it?
– Sonic_
Nov 13 '18 at 11:54
This does not address the basic problem: That the input format is not compressed, and therefordecodeByteArray()is not appropriate to begin with.
– greeble31
Nov 13 '18 at 20:23
opps. I overlooked that thing. ok Then try this: ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray); Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
– Sultan Mahmud
Nov 13 '18 at 20:31
|
show 1 more comment
-1
Just try this:
Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata, 0, bitmapdata.length);
Returns the decoded Bitmap, or null if the image could not be decoded.
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
"mBitmap" has to be a global variable. As it is also being used by another activity. It cant be a local object.
– Sonic_
Nov 13 '18 at 11:44
Local or Public that's not your problem. I think you should learn basic of java like Access Modifier. Thanks
– Sultan Mahmud
Nov 13 '18 at 11:47
It's a static variable what's wrong with it?
– Sonic_
Nov 13 '18 at 11:54
This does not address the basic problem: That the input format is not compressed, and therefordecodeByteArray()is not appropriate to begin with.
– greeble31
Nov 13 '18 at 20:23
opps. I overlooked that thing. ok Then try this: ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray); Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
– Sultan Mahmud
Nov 13 '18 at 20:31
|
show 1 more comment
-1
-1
-1
Just try this:
Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata, 0, bitmapdata.length);
Returns the decoded Bitmap, or null if the image could not be decoded.
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
Just try this:
Bitmap bitmap = BitmapFactory.decodeByteArray(bitmapdata, 0, bitmapdata.length);
Returns the decoded Bitmap, or null if the image could not be decoded.
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
answered Nov 13 '18 at 11:41
Sultan MahmudSultan Mahmud
23017
23017
"mBitmap" has to be a global variable. As it is also being used by another activity. It cant be a local object.
– Sonic_
Nov 13 '18 at 11:44
Local or Public that's not your problem. I think you should learn basic of java like Access Modifier. Thanks
– Sultan Mahmud
Nov 13 '18 at 11:47
It's a static variable what's wrong with it?
– Sonic_
Nov 13 '18 at 11:54
This does not address the basic problem: That the input format is not compressed, and therefordecodeByteArray()is not appropriate to begin with.
– greeble31
Nov 13 '18 at 20:23
opps. I overlooked that thing. ok Then try this: ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray); Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
– Sultan Mahmud
Nov 13 '18 at 20:31
|
show 1 more comment
"mBitmap" has to be a global variable. As it is also being used by another activity. It cant be a local object.
– Sonic_
Nov 13 '18 at 11:44
Local or Public that's not your problem. I think you should learn basic of java like Access Modifier. Thanks
– Sultan Mahmud
Nov 13 '18 at 11:47
It's a static variable what's wrong with it?
– Sonic_
Nov 13 '18 at 11:54
This does not address the basic problem: That the input format is not compressed, and therefordecodeByteArray()is not appropriate to begin with.
– greeble31
Nov 13 '18 at 20:23
opps. I overlooked that thing. ok Then try this: ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray); Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
– Sultan Mahmud
Nov 13 '18 at 20:31
"mBitmap" has to be a global variable. As it is also being used by another activity. It cant be a local object.
– Sonic_
Nov 13 '18 at 11:44
"mBitmap" has to be a global variable. As it is also being used by another activity. It cant be a local object.
– Sonic_
Nov 13 '18 at 11:44
Local or Public that's not your problem. I think you should learn basic of java like Access Modifier. Thanks
– Sultan Mahmud
Nov 13 '18 at 11:47
Local or Public that's not your problem. I think you should learn basic of java like Access Modifier. Thanks
– Sultan Mahmud
Nov 13 '18 at 11:47
It's a static variable what's wrong with it?
– Sonic_
Nov 13 '18 at 11:54
It's a static variable what's wrong with it?
– Sonic_
Nov 13 '18 at 11:54
This does not address the basic problem: That the input format is not compressed, and therefor
decodeByteArray() is not appropriate to begin with.– greeble31
Nov 13 '18 at 20:23
This does not address the basic problem: That the input format is not compressed, and therefor
decodeByteArray() is not appropriate to begin with.– greeble31
Nov 13 '18 at 20:23
opps. I overlooked that thing. ok Then try this: ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray); Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
– Sultan Mahmud
Nov 13 '18 at 20:31
opps. I overlooked that thing. ok Then try this: ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray); Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
– Sultan Mahmud
Nov 13 '18 at 20:31
|
show 1 more comment
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I would recommend try to not provide any option into the decodeByteArray.
– Ivan
Nov 13 '18 at 11:30
yes, tried without the option as well....same.....null
– Sonic_
Nov 13 '18 at 11:32
if
onPreviewFrame(byte data, Camera camera)is from camera.previewCallback, then you have to convert thosebyte datato yuv then to bitmap check this link stackoverflow.com/questions/4768165/…– d.gjinovci
Nov 13 '18 at 12:00
decodeByteArray()takes a compressed image (.jpg, .png, etc.). The frames passed toonPreviewFrame()are not compressed; they are simply in a different format (whatever format you specified when setting up the capture).– greeble31
Nov 13 '18 at 20:16
Hey, thanks a lot @d.gjinovci your suggestion worked for me.
– Sonic_
Nov 14 '18 at 6:48