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 Bundle();
     list_bundle.putStringArray("lists",selected_list); 
     Intent list_Intent = new Intent(v.getContext(), view_selected_items.class);
     startActivityForResult(list_Intent, 2);

But putStringArray("lists",selected_list) is showing a error like we can pass only 1-Dimensional Array (String[]).

Thanks

Matthew Flaschen · Accepted Answer · 2010-10-21 05:52:35Z

3

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");

edited Oct 21, 2010 at 5:52

answered Oct 21, 2010 at 5:11

Matthew Flaschen

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2 Comments

Miya Over a year ago

Please tell me if we use putSerializable(), then how to retrieve the String values using getSerializable()?

Miya Over a year ago

Hi Matthew, When I am using that code, my process is suddently stopped. I am new in Android. Please help me. I don't know how to solve this problem. In my second activity, I need to take the String array values and display it to a TextView named 'items'. My code is: Bundle item_bundle=this.getIntent().getExtras(); String [][] selected_list = (String[][]) item_bundle.getSerializable("lists"); TextView items=(TextView) findViewById(R.id.lbl_items); selected_item=selected_list[0][0]+selected_list[0][1]; items.setText(selected_item);

Symeroro · Accepted Answer · 2013-09-28 13:43:41Z

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];
    }
}

Mehdiway · Accepted Answer · 2012-12-26 21:40:04Z

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 !

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