Array content isn't updated after System.arraycopy()

Question

Maybe someone can tell me why this does not work and why the data in array is not updated after calling setListData??

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


      list1 = (ListView) findViewById(R.id.ListView01);
      list1.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, array));

      final EditText EditMessage = (EditText) findViewById(R.id.editTextWebSite);
      Button button = (Button) findViewById(R.id.button1);

        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                String website = EditMessage.getText().toString();

                //String returnString = loaddata(website);
                Toast.makeText(v.getContext(),
                        "Updating Information",
                        Toast.LENGTH_LONG).show();  
                setListData();

                BaseAdapter la = (BaseAdapter)list1.getAdapter();
                ((BaseAdapter) la).notifyDataSetChanged() ;

                Toast.makeText(v.getContext(),
                        "Updated",
                        Toast.LENGTH_LONG).show();  

            }
        });



private void setListData()
    {
        String array2[] = { "Iphone", "Tutorials", "Gallery", "Android",    "item 1", "item 2", "item3", "item 4" };
         System.arraycopy(array, 0, array2, 0, array.length);
    }

Martijn Courteaux · Accepted Answer · 2011-09-13 18:15:22Z

2

Because of you swapped the params for
System.arraycopy(Object src, int srcPos, Object dest, int destPos, int length).

As you can see, it is first the source and then the destination.

Currently you are copying the content of array into the local temporary array2.

answered Sep 13, 2011 at 18:15

Martijn Courteaux

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3 Comments

SJS Over a year ago

after the change it blows up?

SJS Over a year ago

ERROR/AndroidRuntime(713): java.lang.ArrayIndexOutOfBoundsException

Martijn Courteaux Over a year ago

Check carefully the arguments (the length and postions) you pass to the method. And check the length of the two arrays you are using.

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