Make application icon clickable on the Action Bar
Description
To make the application icon clickable, you need to call the setDisplayHomeAsUpEnabled() method:
@Override/*from ww w . j a v a 2s . c om*/
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
}
When the application icon is clicked, the onOptionsItemSelected() method is called.
To identify the application icon being called, you check the item ID against the android.R.id.home constant:
private boolean MenuChoice(MenuItem item)
{/*www . ja v a 2 s . c o m*/
switch (item.getItemId()) {
case android.R.id.home:
Toast.makeText (this,"You clicked on the Application icon",Toast.LENGTH_LONG).show();
return true;
case 0:
Toast.makeText (this, "You clicked on Item 1",Toast.LENGTH_LONG).show();
return true;
case 1:
//...
}
return false;
}
We can use application icon to return to the main activity.
To do this, we can create an Intent object and set it using the Intent.FLAG_ACTIVITY_CLEAR_TOP flag:
case /* w ww . ja va2s . c om*/
android.R.id.home :
Toast.makeText (this,"You clicked on the Application icon",Toast.LENGTH_LONG).show();
Intent i = new Intent(this, MyActionBarActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
return true;
The Intent.FLAG_ACTIVITY_CLEAR_TOP flag ensures that the series of activities in the back stack is
cleared.