Question

I’m writing an android apps in Java of Eclipse. I’m not very familiar with the java syntax. I encounter this error.

 The constructor Intent(new AdapterView.OnItemClickListener(){},
 Class<NoteEditor> ) is undefined

Below is the code

ListView lv = getListView();

 lv.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {
            Intent intent = new Intent(this, NoteEditor.class);
            startActivity(intent);
    }
});

NoteEditor is extends Activity of Android. The above code is correct because I write it in another place it’s no error.

public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {
    case R.id.new_game:
        Intent intent = new Intent(this, NoteEditor.class);
        startActivity(intent);
        //newGame();
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}

Answer 1

The context used in your code is wrong, as you’re using the anonymous inner class’s this. What you should be using is the Activity’s context, like so:

 Intent intent = new Intent(Category.this, NoteEditor.class);

The first parameter indicates the calling class’s context. So you can use the Activity’s this or getBaseContext()

public Intent (Context packageContext, Class<?> cls)