Proper way to handle action bar up button?
In your onCreate(Bundle savedInstanceState)
, do
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
Then in your onOptionsItemSelected(MenuItem item)
, do
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// go to previous screen when app icon in action bar is clicked
Intent intent = new Intent(this, PreviousActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
Have you also tried this (taken from Android website here) :
in the manifest, for each activity X that needs to go to the main activity, add this to the code:
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
and this to its manifest xml tag:
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.activities.MainActivity" />
if you need to still have the same state on the main activity, use this code instead :
Intent intent = NavUtils.getParentActivityIntent(this);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);
NavUtils.navigateUpTo(this, intent);
if the API is 16 or above, you can add an attribute of parentActivityName with the path to the main activity instead of the metadata .
Found out the root of my problem was a change in the manifest I made a while ago: I added this line:
android:launchMode="singleInstance"
so my main activity wouldn't be relaunched. Changing it to:
android:launchMode="singleTask"
solved my problems, and I was able to remove all the onOptionsItemSelected
stuff. I knew there was something wrong, that Android should have been able to handle this better, and I was right. Check the manifest :P
You can Handle Action Bar button by using Code or XML.
Check this code
if you want it programmatically Add this line in onCreate() method
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
And Override this method onSupportNavigateUp()
@Override
public boolean onSupportNavigateUp(){
finish();
return true;
}
OR Non-programmatically you can add meta to manifest file as
<activity android:name="Current Activity"
android:parentActivityName="Activity you want to open">
</activity>
Note: Make sure Actionbar is not null.