Apps Help a newb with creating a variable

[igorski88]

So here what im trying to do. Im trying to set a variable that i can bring up later in another Activity but in the same packege.

public class MainActivity extends Activity {
	
	private int Item_Selected = 0;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        GridView gridview = (GridView) findViewById(R.id.gridview);
        gridview.setAdapter(new ImageAdapter(this));

        /** Called when the a pic is selected. */
        gridview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            	Item_Selected = position;
                Toast.makeText(MainActivity.this, "" + Item_Selected, Toast.LENGTH_SHORT).show();
                
        	
        	
        Intent myIntent = new Intent(MainActivity.this, TabsActivity.class);
    	MainActivity.this.startActivity(myIntent);
                		
            }
        });
    }               	
        	}

SO I created the Variable and even tested in in the toast to make sure it works. Now I need to call on that variables information in the following code

private int Item_Selected;
	public class SyllabusTabActivity extends ListActivity {
	   

		/** Called when the activity is first created. */
		@Override
		public void onCreate(Bundle savedInstanceState) {
		  super.onCreate(savedInstanceState);
		  if (Item_Selected == 0) {
			  String[] Belt_Array = getResources().getStringArray(R.array.TanBelt_Array);
			  setListAdapter(new ArrayAdapter<String>(this, R.layout.list_items, Belt_Array));
			}else {
				String[] Belt_Array = getResources().getStringArray(R.array.GrayBelt_Array);
				  setListAdapter(new ArrayAdapter<String>(this, R.layout.list_items, Belt_Array));
			}}

This is not working for me. How do i call upon that information?

 

[scrapperstoo]

1st problem is:

private int Item_Selected = 0;

which needs to be

public int Item_Selected = 0;

if you want to be able to access it from another class.


Then, in SyllabusTabActivity, get rid of

int Item_Selected;

and then replace

if (Item_Selected == 0) {

with

if (MainActivity.Item_Selected == 0) {

HTH

 

[alostpacket]

it needs to be static also
1)

public static int itemSelected = 0;

or he could leave it private and use a getter

2)

private static int itemSelected = 0;

public static int getItemSelected()
{
    return itemSelected;
}

then to access it from other classes:

//solution 1
int myLocalVariable = MainActivity.itemSelected; 

//solution 2
int myLocalVariable = MainActivity.getItemSelected();

//do some work
if (myLocalVariable == 1)
{
    Log.d("MyAppTag", "hi");
}

But the "best practice" way to send data would be in the intent

Intent myIntent = new Intent(MainActivity.this, TabsActivity.class);
myIntent.putExtra("current_item_selected", itemSelected);
MainActivity.this.startActivity(myIntent);

then inside onCreate() in SyllabusTabActivity

//get the intent passed to the activity when it was created
Intent myReceivedIntent = getIntent();

// get the int value out of the intent.  
// -1 is the value we use if the int isnt found inside the intent
int itemSelected = myReceivedIntet.getIntExtra ( "current_item_selected", -1);

if (itemSelected  == 0) 
{
    //do some stuff
}