(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
format. Only then can I get the exact image.
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):
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03-24 04:29:43.816: E/OnResponse(15392): 9& &99999999999999999999999999999999999999999999999999ÿÂ��¸¸��"��ÿÄ����������������������������ÿÄ��������������������������ÿÄ��������������������������ÿÚ����������íÐÙG,!.Ph5ð8ò÷¸¥®ÐàÔ§DUdº
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03-24 04:29:43.816: E/OnResponse(15392): K¥Yp ³ºXC¹O/)u RÉuEÊ$£³UÂP©hL^ÅÌ ·üûÌ%§ EU-1i6Ss©,ÞÌõ®{·W¹k`¤I!kwt%ÙeP¦*Ôªóï-¿
03-24 04:29:43.816: E/OnResponse(15392): l"4áá#^-KSIBá¯S¨jYeîÌùucÓq}Lvå^ jÍ [Bz¾·í'nUï#tE ÂQ(äf)Uw(5ݨG/cUÙÀSAIÓ(´ÌÑY.,±iíÒ«Bଽ^pvf;TAX,KÄEµ XbìÜHqßìx¯Wf ¬«R\¤.ªªì#IOYçx=ÿ��7+J%g(ªÉM*ÖhÙ¶ìíZMøعs^²Èó¡fº(%F¬î\ÓF¥§*ÇÈÉ+«Çu{Hë¥]G4Q%A]Eñî>±3¦Y:,tÖØ&:×F3Óf]¡9ÖõQ9Zã��ÕZ3¼9zIÖy¶ÓT ÓPֺϫ@eÎv ìô}¿%ên[Tz)h6v¹n,h°°?ÅfìÓOÇZ1ЮÑCdÖJí³íÁ±ÌN·VcÔpÐèkEÃ`W°+5hg
`Eçg4µãß4VzÆÏ[ã½-x7¨A`ºÊD5Wå®ky{º¬ZùöeÔÏG¶Br VD&´³·
&µçY׬fLDLEP²¬X°2®æ¹\{Æ|°o{¾¦®w* Kªj2ÖåÉâ��nkv¼yöÐC3·±MÎWÆ%ÈmÞ e��æÌè*ÍsgJSWPØ+bn]@0×<¸7cßnçé³Ü߸pª(©AÕÂÖV*ϯNlë^¬:ùõÝjfz½©vuwV4nvFåf°ÒT±0&§c,³ Yv#tUH\%Ø\ÚÇ6¹-úr[n}ÃêÈÊ`J¡£! t¬ªÍ£<7VMXë³Fmú¹«vwED¥pÐlÌ6k!m+[lI@2Ò¬êÂhFè© jl%\Gfß Ìäï¿>o!jJ²Ìn¡,®XJg"<ÊH!»±ô±ÔÞ¶c¦¥ÙÝÚÙ `HwW¨Â]¡Â;R´eZ¦Í.¡T`-MSs3ståS|˧ØY¢VÛ1ÌA^¶"¹Id"¹¹=,»ùÄô0o¾=©7¥ù¦u¶ò:WÚa..ÊAÙ F®tXhÐåJB#)Â1bj±jhÙÍÍÒæôåV,×-^ãÃûPúuë9rj#D^®4WFªêÞ_sÇÓÈáú(?¥r2³¡'äa¥y]yÖfúRàîèGf´¦vuóñCYë³Gj¹$t&
03-24 04:29:43.816: E/OnResponse(15392): ftK4]Oc¾yØ;u^ØÎûÀ!×ÎÖZ±yVµv ÐÙËò¿/.ÃÇìr±Ó6ìÚõdÌél0MU±:æ3¤¼æµ¸é[qêÍ}´õà\ÈÚÍg³å^{0½*ÃÓÎò£¨Äàb«Óæëë/£¬Îo|½æîV{ðUµr®1É.¥Ü.
¥!ù±ÐyÝNo>ØõfÔ\ãuvc=C¨².¥H:M$º$£\é:·
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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.
03-24 04:29:43.816: D/skia(15392): --- SkImageDecoder::Factory returned null
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.
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:
Invalid length for a Base-64 char array.
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):
data:image/png;base64,GvygDaYb64wUon0lxp2H1458543376==
I see a little square, which is likely not the image (see next section).
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.
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 a byte[] from the network library or an InputStream (Readers also have text encoding associated which is wrong for binary data).