(Edited)
-
While hitting the API in browser, it is downloading the image. The URL is
http://example.com/api/v1/filedownloader.json?file=GvygDaYb64wUon0lxp2H1458543376
. -
I have changed the server name and added
example.com
to that URL. So
it won’t download an image file while running in browser. But you can
see the image file
here. -
Then I checked the file with Encode
tool and
Decode
tool. -
After decoding, I am getting
.bin file
. Then I changed into.png
. Only then can I get the exact image.
format -
I don’t know how to do all these functionalities to get the image and
display it in imageView. -
Anyhow I tried the code below with this:
Logcat:
03-24 04:29:43.816: E/OnResponse(15392): ÿØÿà��JFIF������������ÿí��Photoshop 3.0��8BIM����������g��9dXpsI_ORS9jWIcxWfWe(��bFBMD01000abe030000070e0000c51a0000161c0000251d0000bc2000007f350000fc370000323a00003f3c0000f4620000ÿâICC_PROFILE������lcms����mntrRGB XYZ Ü��������)��9acspAPPL����������������������������������������������������öÖ����������Ó-lcms����������������������������������������������������������������������������������������������
03-24 04:29:43.816: E/OnResponse(15392): desc������ü������^cprt����������wtpt����h������bkpt����|������rXYZ����������gXYZ����¤������bXYZ����¸������rTRC����Ì������@gTRC����Ì������@bTRC����Ì������@desc��������������c2��������������������������������������������������������������������������������������������������������������������������������������������������������������������text��������FB����XYZ ������������öÖ����������Ó-XYZ ����������������3����¤XYZ ������������o¢����8õ����XYZ ������������b����·����ÚXYZ ������������$ ��������¶Ïcurv��������������������ËÉckö?Q4!ñ)2;FQw]íkpz±|¬i¿}ÓÃé0ÿÿÿÛ��C��
03-24 04:29:43.816: E/OnResponse(15392):
"##! %*5-%'2( .?/279<<<$-BFA:F5;<9ÿÛ��C
03-24 04:29:43.816: E/OnResponse(15392): 9& &99999999999999999999999999999999999999999999999999ÿÂ��¸¸��"��ÿÄ����������������������������ÿÄ��������������������������ÿÄ��������������������������ÿÚ����������íÐÙG,!.Ph5ð8ò÷¸¥®ÐàÔ§DUdº
de��kP'.¤ÅS BG ìóölâvw@+.ÆÖ®©$¸
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03-24 04:29:43.816: E/OnResponse(15392): K¥Yp ³ºXC¹O/)u RÉuEÊ$£³UÂP©hL^ÅÌ ·üûÌ%§ EU-1i6Ss©,ÞÌõ®{·W¹k`¤I!kwt%ÙeP¦*Ôªóï-¿
03-24 04:29:43.816: E/OnResponse(15392): l"4áá#^-KSIBá¯S¨jYeîÌùucÓq}Lvå^ jÍ [Bz¾·í'nUï#tE ÂQ(äf)Uw(5ݨG/cUÙÀSAIÓ(´ÌÑY.,±iíÒ«Bଽ^pvf;TAX,KÄEµ XbìÜHqßìx¯Wf ¬«R¤.ªªì#IOYçx=ÿ��7+J%g(ªÉM*ÖhÙ¶ìíZMøعs^²Èó¡fº(%F¬îÓF¥§*ÇÈÉ+«Çu{Hë¥]G4Q%A]Eñî>±3¦Y:,tÖØ&:×F3Óf]¡9ÖõQ9Zã��ÕZ3¼9zIÖy¶ÓT ÓPֺϫ@eÎv ìô}¿%ên[Tz)h6v¹n,h°°?ÅfìÓOÇZ1ЮÑCdÖJí³íÁ±ÌN·VcÔpÐèkEÃ`W°+5hg
`Eçg4µãß4VzÆÏ[ã½-x7¨A`ºÊD5Wå®ky{º¬ZùöeÔÏG¶Br VD&´³·
&µçY׬fLDLEP²¬X°2®æ¹{Æ|°o{¾¦®w* Kªj2ÖåÉâ��nkv¼yöÐC3·±MÎWÆ%ÈmÞ e��æÌè*ÍsgJSWPØ+bn]@0×<¸7cßnçé³Ü߸pª(©AÕÂÖV*ϯNlë^¬:ùõÝjfz½©vuwV4nvFåf°ÒT±0&§c,³ Yv#tUH%ØÚÇ6¹-úr[n}ÃêÈÊ`J¡£! t¬ªÍ£<7VMXë³Fmú¹«vwED¥pÐlÌ6k!m+[lI@2Ò¬êÂhFè© jl%Gfß Ìäï¿>o!jJ²Ìn¡,®XJg"<ÊH!»±ô±ÔÞ¶c¦¥ÙÝÚÙ `HwW¨Â]¡Â;R´eZ¦Í.¡T`-MSs3ståS|˧ØY¢VÛ1ÌA^¶"¹Id"¹¹=,»ùÄô0o¾=©7¥ù¦u¶ò:WÚa..ÊAÙ F®tXhÐåJB#)Â1bj±jhÙÍÍÒæôåV,×-^ãÃûPúuë9rj#D^®4WFªêÞ_sÇÓÈáú(?¥r2³¡'äa¥y]yÖfúRàîèGf´¦vuóñCYë³Gj¹$t&
03-24 04:29:43.816: E/OnResponse(15392): ftK4]Oc¾yØ;u^ØÎûÀ!×ÎÖZ±yVµv ÐÙËò¿/.ÃÇìr±Ó6ìÚõdÌél0MU±:æ3¤¼æµ¸é[qêÍ}´õàÈÚÍg³å^{0½*ÃÓÎò£¨Äàb«Óæëë/£¬Îo|½æîV{ðUµr®1É.¥Ü.
¥!ù±ÐyÝNo>ØõfÔãuvc=C¨².¥H:M$º$£é:·
dt(ÓZÆP×ró¬³P-P¥µR¯ü]9wØÕóínnÿ��+£æùç
pçRv¢E¢òêNw1j>]¸ë65.çլ첢² 1ì0aÝÉVrÀ¦] j¬eµpïÍeä×]9vW&;§ÑùßAßÆéɽc®|n Ù!æYbÔ£¢èLVwñïËÍÕâGUÙuã©°hC-eEg~u
03-24 04:29:43.816: E/OnResponse(15392): MnK9Û0ìW¥Îzr¥º.êVÅBrjǬKOx%³*·µÍßÛÍììòúÉrCÍBcAXrÅ1Þ;Óçã¦Xusé jLS[uXïFuJf¡«²Ãôb|t3µ¶¢£(XÂÐùwË£ÒÌÖ¢#:qê^o·T��ä%gÈ`*WQlJ N×EÌéx®4»õáÓÃÓ±n6f6
03-24 04:29:43.816: D/skia(15392): --- SkImageDecoder::Factory returned null
03-24 04:29:43.816: E/myBitmap(15392): null
03-24 04:29:43.816: D/AndroidRuntime(15392): Shutting down VM
03-24 04:29:43.817: E/AndroidRuntime(15392): FATAL EXCEPTION: main
03-24 04:29:43.817: E/AndroidRuntime(15392): Process: com.steve.test, PID: 15392
03-24 04:29:43.817: E/AndroidRuntime(15392): java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
03-24 04:29:43.817: E/AndroidRuntime(15392): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:596)
03-24 04:29:43.817: E/AndroidRuntime(15392): at com.steve.test.SecondActivity$1.onResponse(SecondActivity.java:121)
03-24 04:29:43.817: E/AndroidRuntime(15392): at com.steve.test.SecondActivity$1.onResponse(SecondActivity.java:1)
03-24 04:29:43.817: E/AndroidRuntime(15392): at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
03-24 04:29:43.817: E/AndroidRuntime(15392): at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:1)
03-24 04:29:43.817: E/AndroidRuntime(15392): at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
03-24 04:29:43.817: E/AndroidRuntime(15392): at android.os.Handler.handleCallback(Handler.java:739)
03-24 04:29:43.817: E/AndroidRuntime(15392): at android.os.Handler.dispatchMessage(Handler.java:95)
03-24 04:29:43.817: E/AndroidRuntime(15392): at android.os.Looper.loop(Looper.java:135)
03-24 04:29:43.817: E/AndroidRuntime(15392): at android.app.ActivityThread.main(ActivityThread.java:5221)
03-24 04:29:43.817: E/AndroidRuntime(15392): at java.lang.reflect.Method.invoke(Native Method)
03-24 04:29:43.817: E/AndroidRuntime(15392): at java.lang.reflect.Method.invoke(Method.java:372)
03-24 04:29:43.817: E/AndroidRuntime(15392): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
03-24 04:29:43.817: E/AndroidRuntime(15392): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
SecondActivity.java:
public class SecondActivity extends AppCompatActivity {
String base64String;
Bitmap bitmap;
ImageView img ;
String userValidationURL, base64;
byte[] data;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_activity);
img = (ImageView)findViewById(R.id.imageView);
base64String = "GvygDaYb64wUon0lxp2H1458543376";
userValidationURL = "http://example.com/api/v1/filedownloader.json?file=GvygDaYb64wUon0lxp2H1458543376";
hitSearchApi();
}
private void hitSearchApi(){
Log.e("userValidationUrl", userValidationURL);
StringRequest request = new StringRequest(Request.Method.GET, userValidationURL, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if(response != null && !response.startsWith("<HTML>")){
Log.e("OnResponse", response);
byte[] decodedString = Base64.decode("GvygDaYb64wUon0lxp2H1458543376", Base64.DEFAULT);
Bitmap myBitmap = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
Log.e("mybitmap", ""+myBitmap);
img.setImageBitmap(Bitmap.createScaledBitmap(myBitmap, img.getWidth(), img.getHeight(), false));
dialog.dismiss();
}else{
Log.e("onResponseElse", "onResponseElse");
dialog.dismiss();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if(error != null){
Log.e("error", error.toString());
dialog.dismiss();
}
}
}){
@Override
protected Map<String,String> getParams(){
Map<String,String> params = new HashMap<String, String>();
params.put("file", base64String);
Log.e("paramsImg", ""+params);
return params;
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String,String> params = new HashMap<String, String>();
params.put("Content-Type","application/x-www-form-urlencoded");
return params;
}
};
RequestQueue queue = Volley.newRequestQueue(SecondActivity.this);
queue.add(request);
queue.getCache().remove(userValidationURL);
}
}
What is wrong with this code? Why I am getting null
in bitmap. Anyone can help me with this.
7
Answers
As you can see from the logs that
E/myBitmap: null
This means you are not able decode bitmap. Please refer this answer
Convert Base64 string to bitmap
Also make sure that you are taking appropriate approach depending upon whether or not you are receiving
in the base64 encoded string.
That is either slice the part
from the string then decode it using
Base64.DEFAULT
or
alternatively use
Base64.URL_SAFE
if you are slicing it out.Edit:
Change the following line in
loadImage
to
Also if it doesn’t work let me know what the value of encodedImage string is.
Also make sure that
is not being passed in the response.
If you are having problem verifying whether the string is image you can create a simple html page with following
replace content within ‘<‘ , ‘>’ with appropriate content and open html page in browser.
Alternatively you can head over to this link and paste the string there.
You are getting correct
base64
encoded String. Just convert that String intobitmap
using following code:Bitmap that you are passing to
bitMapToString
function isnull
so you are gettingnull
object error.You are not getting correct
bitmap
inloadImage();
so make changes like
In this way you will get
bitmap
Actually, a Base64 string has so many characters. Your Base64 string is not correct, upload the image to this website to get the Base64 string. Use that string in your code instead.
This signals that the input to
BitmapFactory.decode
was invalid in some way.Below I list a few possible scenarios that may trick you, not sure which one applies though, because you didn’t disclose the real Url, and the code you posted doesn’t even try to decode data coming from the network.
Base64 Padding
Your hardcoded input string is
GvygDaYb64wUon0lxp2H1458543376
which is not a valid Base64 encoded string. To see why enter it on the page: http://string-functions.com/base64decode.aspx, it’ll say:Change it to
GvygDaYb64wUon0lxp2H1458543376==
(notice the end) and it’ll show you weird glyphs, but that’s just because it’s binary data, so it successfully decoded.Weirdly the
Base64
class should throw an exception when padding is missing, which you didn’t get…You can also check the contents of an encoded string in the Chrome, enter this into the address-bar of a new tab (replace after comma, see valid example):
I see a little square, which is likely not the image (see next section).
Base64 Format
That sample you’re trying to decode is also in some weird format. It’s not a PNG/GIF/JPEG file which is supported by the Android system, it’s missing a header. Take a look at the list of supported formats: http://developer.android.com/guide/appendix/media-formats.html (scroll down to Images), these are the data types you’ll be able to load.
I tried loading the that short byte[] with multiple imaging software on my laptop and nothing recognized it as an image file and I agree with them, I can’t see any image-like in it in a hex editor either.
Base64 – Not!
If you’re trying to decode the variable
response
make sure it’s a Base64 encoded string. What is in the logs above is a JPEG file, but it’s probably broken. Notice that you’re using StringRequest, that will only work if you’re really getting a Base64 string which consists of[a-zA-Z0-9+/=]
characters.To read binary data you’ll need to fire a different type of request which is different based on your networking library, but the key point is that if you receive binary data in String format that means there was some text encoding applied to it, but binary data doesn’t have character encoding, it’s just plain 0x00-0xFF bytes without any interpretation.
BitmapFactory.decode
on binary data will only work if you’re receiving abyte[]
from the network library or anInputStream
(Reader
s also have text encoding associated which is wrong for binary data).This may help, albeit not directly. My situation was that I had an image handler script which secured images by hiding their location and only rendering their base64-encoded strings after strict validations. Then I thought this could work with an android web-view on local html files with hardcoded URLs to local storage location but Bitmap Factory kept on complaining of null values. I had to secure the location by same script but instead of delivering base-64 data, I forced the image download via this code (at php server side) after necessary authorizations: