public SampleGridViewAdapter(Context context,ArrayList<String> urls) {
this.context = context;
this .urls=urls;
Log.i("DDDDDDDDDD",String.valueOf(urls));
simpleArray = urls.toArray(new String[urls.size()]);
Log.i("GGGGGGGGGGG",String.valueOf(simpleArray));
}
When I print DDDDDDD in the log, the output is an arraylist of URL's, but when I see GGGGGGG, it changes to 05-09 [Ljava.lang.String;@b125cf00
You can do this for converting ArrayList to String[].
public SampleGridViewAdapter(Context context,ArrayList<String> urls) {
this.context = context;
this .urls=urls;
Log.i("DDDDDDDDDD",String.valueOf(urls));
String[] simpleArray = new String[urls.size()];
simpleArray = urls.toArray(simpleArray);
Log.i("GGGGGGGGGGG",String.valueOf(simpleArray));
}
OR you can also do this way -
public SampleGridViewAdapter(Context context,ArrayList<String> urls) {
this.context = context;
this .urls=urls;
Log.i("DDDDDDDDDD",String.valueOf(urls));
Object[] simpleArray = urls.toArray();
for(int i = 0; i < simpleArray.length ; i++){
Log.d("string is",(String)simpleArray[i]);
}
Log.i("GGGGGGGGGGG",String.valueOf(simpleArray));
}
ArrayList<String> list = new ArrayList() ;
String[] array = list.toArray(new String[list.size()]);
From java docs at
http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html#toArray(T[])
toArray
public <T> T[] toArray(T[] a)
Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array. If the list fits in the specified array, it is returned therein. Otherwise, a new array is allocated with the runtime type of the specified array and the size of this list.
If the list fits in the specified array with room to spare (i.e., the array has more elements than the list), the element in the array immediately following the end of the collection is set to null. (This is useful in determining the length of the list only if the caller knows that the list does not contain any null elements.)
Specified by:
toArray in interface Collection<E>
Specified by:
toArray in interface List<E>
Overrides:
toArray in class AbstractCollection<E>
Parameters:
a - the array into which the elements of the list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
Returns:
an array containing the elements of the list
Throws:
ArrayStoreException - if the runtime type of the specified array is not a supertype of the runtime type of every element in this list
NullPointerException - if the specified array is null
You can try this:
List<String> list = new ArrayList<String>();
list.add("Item 1");
list.add("Item 2");
String joined = TextUtils.join(", ", list);
Log.d("tanim", joined);
I found this code from this post . it may help you click
