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Remove static mapping arrays

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@pserwylo Not sure if you like this change. I think it's slightly more
elegant, but don't have a strong opinion.
This commit is contained in:
mvp76 2017-03-01 13:21:30 +01:00 committed by Peter Serwylo
parent 89fa83c8c7
commit 48b21626e4
2 changed files with 20 additions and 23 deletions
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2
app/src/main/java/org/fdroid/fdroid/views/main/MainActivity.java
View File

@ -46,7 +46,7 @@ public class MainActivity extends AppCompatActivity implements BottomNavigationV
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
pager.scrollToPosition(MainViewAdapter.ID_TO_POSITION.get(item.getItemId()));
pager.scrollToPosition(((MainViewAdapter) pager.getAdapter()).adapterPositionFromItemId(item.getItemId()));
return true;
}

41
app/src/main/java/org/fdroid/fdroid/views/main/MainViewAdapter.java
View File

@ -25,31 +25,18 @@ import org.fdroid.fdroid.R;
*/
class MainViewAdapter extends RecyclerView.Adapter<MainViewController> {
// Helpers for switching between the API of the RecyclerViewPager and the BottomNavigationView.
// One identifies items by position, the other by menu item ID, yet they need to be able
// to talk to and control each other. If the user swipes the view pager, the bottom nav needs
// to update, and vice-versa.
static final SparseIntArray ID_TO_POSITION = new SparseIntArray();
static final SparseIntArray POSITION_TO_ID = new SparseIntArray();
static {
ID_TO_POSITION.put(R.id.whats_new, 0);
ID_TO_POSITION.put(R.id.categories, 1);
ID_TO_POSITION.put(R.id.nearby, 2);
ID_TO_POSITION.put(R.id.my_apps, 3);
ID_TO_POSITION.put(R.id.settings, 4);
POSITION_TO_ID.put(0, R.id.whats_new);
POSITION_TO_ID.put(1, R.id.categories);
POSITION_TO_ID.put(2, R.id.nearby);
POSITION_TO_ID.put(3, R.id.my_apps);
POSITION_TO_ID.put(4, R.id.settings);
}
private final SparseIntArray positionToId = new SparseIntArray();
private final AppCompatActivity activity;
MainViewAdapter(AppCompatActivity activity) {
this.activity = activity;
setHasStableIds(true);
positionToId.put(0, R.id.whats_new);
positionToId.put(1, R.id.categories);
positionToId.put(2, R.id.nearby);
positionToId.put(3, R.id.my_apps);
positionToId.put(4, R.id.settings);
}
@Override
@ -61,7 +48,7 @@ class MainViewAdapter extends RecyclerView.Adapter<MainViewController> {
@Override
public void onBindViewHolder(MainViewController holder, int position) {
int menuId = POSITION_TO_ID.get(position);
long menuId = getItemId(position);
if (menuId == R.id.whats_new) {
holder.bindWhatsNewView();
} else if (menuId == R.id.categories) {
@ -79,6 +66,16 @@ class MainViewAdapter extends RecyclerView.Adapter<MainViewController> {
@Override
public int getItemCount() {
return 5;
return positionToId.size();
}
// The RecyclerViewPager and the BottomNavigationView both use menu item IDs to identify pages.
@Override
public long getItemId(int position) {
return positionToId.get(position);
}
public int adapterPositionFromItemId(int itemId) {
return positionToId.indexOfValue(itemId);
}
}