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19 Cards in this Set
- Front
- Back
options menu |
options menu: name of the menu that can appear on the action bar. options typically refer to entire screen or entire app |
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What's the first step to creating a menu?
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they're a resource similar to layouts, so create a res/menu subdirectory and then create a new xml file with an item that has a title, id, showAsAttribute |
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showAsAttribute |
determines whether the menu item appears on the action bar itself or on the overflow menu. don't use always > better to use "ifRoom" and let OS decide |
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What kinds of items should you put on the action bar? |
only ones that users will use frequently --> avoid cluttering the screen |
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system icon |
icon that is found on the device rather than in the project's resources. Fine for prototype but better to have it in your own resources if meant for release --> control what the user sees (can copy the system icons directly into project's resources) |
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Two options menu callbacks you'll need in a fragment for implementing an Options menu |
public void onCreateOptionsMenu(Menu, MenuInflater) public boolean onOptionsSelected(MenuItem item) |
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Code to override onCreateOptionsMenu(...) |
@Overridepublic void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); inflater.inflate(R.menu.fragment_crime_list, menu); } |
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What do you do after overriding onCreateOptionsMenu(...)? |
Tell the FragmentManager that the fragment should receive a call to onCreateOptionsMenu(...) by adding: setHasOptionsMenu(true) in onCreate(...) for the fragment |
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How do you determine which menu item has been selected? |
Check its id item.getItemId() |
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temporal navigation |
what you get when you use the back button. takes you to where you were last |
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ancestral navigation |
aka hierarchical navigation: takes you up the app hierarchy |
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Android's recommendation for ancestral navigation |
implement the app icon to go "up" one level to the parent of the current activity |
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How do you visually let the user know the icon is enabled as a "home" button for ancestral navigation? |
caret pointing to the left @TargetApi(11) if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){ getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);} //this just enables the caret. it doesn't do the actual wiring |
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How do you respond to an enabled app icon? |
treat as if it were an existing options menu item: override onOptionsItemSelected(MenuItem) |
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What's the resource id for the android home icon? |
android.R.id.home |
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Best way to implement ancestral navigation |
use navUtils and add metadata to the manifest |
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How do you add parent activity metadata in the manifest? |
< meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".CrimeListActivity" /> (basically creating a name-value pair that the NavUtils class can recognize) |
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After you've added parent activity metadata to the manifest, how do you check whether there's a parent activity and, if so, go back to it? |
if (NavUtils.getParentActivityName(getActivity()) != null){ NavUtils.navigateUpFromSameTask(getActivity());} |
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Why is it better to use NavUtils than starting the parent activity yourself? |
short and easy centralizes relationship between activities in the manifest |