putStringArray() using String 2-Dimensional array (String[][] )

Question

I want to pass a 2-D String Array to another activity. My S2-D String Array (String[][]) is \'selected_list\'.

code is :

     Bundle list_bundle=new         


        

Answer 1

This finally works well for me : Thanks to Matthew and Mehdiway

To start a new activity (sending String[][] and String):

String[][] arrayToSend=new String[3][30];
String stringToSend="Hello";
Intent i = new Intent(this, NewActivity.class);

i.putExtra("key_string",stringToSend);

Bundle mBundle = new Bundle();
mBundle.putSerializable("key_array_array",  arrayToSend);
i.putExtras(mBundle);

startActivity(i);

To access in NewActivity.onCreate:

String sReceived=getIntent().getExtras().getString("key_string");

String[][] arrayReceived=null;
Object[] objectArray = (Object[]) getIntent().getExtras().getSerializable("key_array_array");
if(objectArray!=null){
    arrayReceived = new String[objectArray.length][];
    for(int i=0;i<objectArray.length;i++){
        arrayReceived[i]=(String[]) objectArray[i];
    }
}

Answer 2

You can use putSerializable. Arrays are serializable, provided their elements are.

To store:

list_bundle.putSerializable("lists", selected_list);

To access:

String[][] selected_list = (String[][]) bundle.getSerializable("lists");

Answer 3

As Matthew said, you can put the string array in the bundle like this

Bundle list_bundle=new Bundle();
list_bundle.putStringArray("lists",selected_list);

This works very well, but when you try to get the array via (String[][]) bundle.getSerializable("lists"); it gives a

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to java.util.String

So what you have to do is this :

    Object[] objectArray = (Object[]) getIntent().getExtras().getSerializable("lists");
    int horizontalLength = 0;
    if (objectArray.length > 0)
        horizontalLength = ((Object[]) objectArray[0]).length; // See explanation to understand the cast
    String[][] my_list = new String[objectArray.length][horizontalLength];
    int i = 0;
    for(Object row : objectArray)
    {
        my_list[i][0] = ((String[])row)[0];
        my_list[i++][1] = ((String[])row)[1];
    }

Explanation :

When you get the array as I Serializable object it doesn't behave the same way a simple String array does, instead it considers every row as a separate array, so what you have to do is to read the Serializable object as a one dimensional array, and then cast every row of it to a String[] array. Et voila !