Listing all extras of an Intent

Question

For debugging reasons I want to list all extras  and their values  of an Intent  Now  getting the keys isn t a problem  Set lt String gt  keys   intent getExtras   keySet      but getting the values of the keys is one for me  because some values are strings  some are boolean    How could I get the values in a loop  looping through the keys  and write the values to a logfile  Thanks for any hint

User · Answer

The Kotlin version of Pratik s utility method which dumps all extras of an Intent   fun dumpIntent intent  Intent         val bundle  Bundle   intent extras    return      val keys   bundle keySet       val it   keys iterator        Log d TAG   Dumping intent start        while  it hasNext              val key   it next           Log d TAG       key         bundle get key                   Log d TAG   Dumping intent finish

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private TextView tv    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        tv   new TextView this       tv setText  Extras   n r         setContentView tv        StringBuilder str   new StringBuilder        Bundle bundle   getIntent   getExtras        if  bundle    null            Set lt String gt  keys   bundle keySet            Iterator lt String gt  it   keys iterator            while  it hasNext                  String key   it next                str append key               str append                   str append bundle get key                str append   n r                      tv setText str toString

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You can do it in one line of code   Log d  intent URI   intent toUri 0      It outputs something like     Intent action android intent action MAIN category android intent category LAUNCHER launchFlags 0x10a00000 component com mydomain myapp  StartActivity sourceBounds 12 20870 20276 201167  l profile 0  end   At the end of this string  the part that I bolded  you can find the list of extras  only one extra in this example    This is according to the toUri documentation   The URI contains the Intent s data as the base URI  with an additional fragment describing the action  categories  type  flags  package  component  and extras

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Here s what I used to get information on an undocumented  3rd-party  intent   Bundle bundle   intent getExtras    if  bundle    null        for  String key   bundle keySet              Log e TAG  key            bundle get key     null   bundle get key     NULL               Make sure to check if bundle is null before the loop

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I noticed in the Android source that almost every operation forces the Bundle to unparcel its data  So if  like me  you need to do this frequently for debugging purposes  the below is very quick to type   Bundle extras   getIntent   getExtras    extras isEmpty       unparcel System out println extras

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I wanted a way to output the contents of an intent to the log  and to be able to read it easily  so here s what I came up with  I ve created a LogUtil class  and then took the dumpIntent   method  Pratik created  and modified it a bit  Here s what it all looks like   public class LogUtil        private static final String TAG    IntentDump        public static void dumpIntent Intent i           Bundle bundle   i getExtras            if  bundle    null                Set lt String gt  keys   bundle keySet                 StringBuilder stringBuilder   new StringBuilder                stringBuilder append  IntentDump  n r                stringBuilder append  ------------------------------------------------------------- n r                 for  String key   keys                    stringBuilder append key  append      append bundle get key   append   n r                               stringBuilder append  ------------------------------------------------------------- n r                Log i TAG  stringBuilder toString                         Hope this helps someone

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The get String key  method of Bundle returns an Object   Your best bet is to spin over the key set calling get String  on each key and using toString   on the Object to output them   This will work best for primitives  but you may run into issues with Objects that do not implement a toString

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Sorry if this is too verbose or too late  but this was the only way I could find to get the job done  The most complicating factor was the fact that java does not have pass by reference functions  so the get---Extra methods need a default to return and cannot modify a boolean value to tell whether or not the default value is being returned by chance  or because the results were not favorable  For this purpose  it would have been nicer to have the method raise an exception than to have it return a default   I found my information here  Android Intent Documentation          substitute your own intent here     Intent intent   new Intent        intent putExtra  first    hello        intent putExtra  second   1       intent putExtra  third   true       intent putExtra  fourth   1 01          convert the set to a string array   Set Documentation      String   anArray           Set lt String gt  extras1    Set lt String gt   intent getExtras   keySet        String   extras    String    extras1 toArray anArray          an arraylist to hold all of the strings        rather than putting strings in here  you could display them     ArrayList lt String gt  endResult   new ArrayList lt String gt         for  int i 0  i lt extras length  i                try using as a String         String aString   intent getStringExtra extras i               is a string  because the default return value for a non-string is null         if  aString    null                endResult add extras i            aString                        not a string         else                  try the next data type  int             int anInt   intent getIntExtra extras i   0                  is the default value signifying that either it is not an int or that it happens to be 0              if  anInt    0                       is an int value that happens to be 0  the same as the default value                 if  intent getIntExtra extras i   1     1                        endResult add extras i            Integer toString anInt                                         not an int value                    try double  also works for float                  else                       double aDouble   intent getDoubleExtra extras i   0 0                          is the same as the default value  but does not necessarily mean that it is not double                     if  aDouble    0 0                               just happens that it was 0 0 and is a double                         if  intent getDoubleExtra extras i   1 0     1 0                                endResult add extras i            Double toString aDouble                                                         keep looking                            else                                  lastly check for boolean                             boolean aBool   intent getBooleanExtra extras i   false                                  same as default  but not necessarily not a bool  still could be a bool                              if  aBool    false                                       it is a bool                                  if  intent getBooleanExtra extras i   true     true                                        endResult add extras i            Boolean toString aBool                                                                      else                                         well  the road ends here unless you want to add some more data types                                                                                                it is a bool                             else                                   endResult add extras i            Boolean toString aBool                                                                                                         is a double                     else                           endResult add extras i            Double toString aDouble                                                                         is an int value             else                   endResult add extras i            Integer toString anInt                                         to display at the end     for  int i 0  i lt endResult size    i              Toast makeText this  endResult get i   Toast LENGTH SHORT  show

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Bundle extras   getIntent   getExtras    Set lt String gt  ks   extras keySet    Iterator lt String gt  iterator   ks iterator    while  iterator hasNext          Log d  KEY   iterator next

User · Answer

If for debugging all you want is a string  sort of implied by the OP but not explicitly stated   simply use toString on the extras Bundle   intent getExtras   toString     It returns a string such as   Bundle  key1 value1  key2 value2  key3 value3     Documentation  Bundle toString    it s unfortunately the default Object toString   javadoc and as such quite useless here

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You could use for  String key   keys    Object o   get key   to return an Object  call getClass   getName   on it to get the type  and then do a set of if name equals  String   type things to work out which method you should actually be calling  in order to get the value

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This is how I define utility method to dump all extras of an Intent   import java util Iterator  import java util Set  import android os Bundle    public static void dumpIntent Intent i        Bundle bundle   i getExtras        if  bundle    null            Set lt String gt  keys   bundle keySet            Iterator lt String gt  it   keys iterator            Log e LOG TAG  Dumping Intent start            while  it hasNext                  String key   it next                Log e LOG TAG       key         bundle get key                          Log e LOG TAG  Dumping Intent end

[android] Listing all extras of an Intent

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