Question

I’ve implemented a ‘home screen’ for my application, which consists of a gridview containing icons and text. This works fine, and I can add an OnItemClickListener so that tapping an icon will create a toast, for example. But I’m not sure how to call startActivityForResult() from here. I could pass in the application context and use this to create the intent etc, but this doesn’t feel like the right way of doing it.

My code looks like this:

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

    GridView gridview = (GridView) findViewById(R.id.icons_gridview);
    gridview.setAdapter(new HomeScreenAdapter(this));

    gridview.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            switch(position){
            case 0:
                //need to start new activity 1 from here
                break;
            case 1:
                //need to start new activity 2 from here
                break;
            }
        }
    });

Thanks for any help,

TLB

Answer 1

Method 1 (my prefered method)

Passing ActivityName.this as context is the way I do it. For example

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

    GridView gridview = (GridView) findViewById(R.id.icons_gridview);
    gridview.setAdapter(new HomeScreenAdapter(this));

    gridview.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
        switch(position){
        case 0:
            Intent intent = new Intent(MyActivity.this, NextActivity.class);
            startActivityForResult(intent, 0);
            break;
        case 1:
            //need to start new activity 2 from here
            break;
        }
    }
});

Method 2

You could pass getApplicationContext() as the context;

Method 3

Having a Context mContext field is a common method. Set it at the start of your onCreate then use mContext to start your activities.

private Context mContext;

then

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

    mContext = this;

    ...
 }

Then you can start a new activity using mContext as the context parameter

Intent intent = new Intent(mContext, NextActivity.class);
startActivityForResult(intent, 0);