android.widget.ArrayAdapter#getItem ( )源码实例Demo

public static void setIconSpinner(Spinner spinner, String iconValue) {
  @SuppressWarnings("unchecked")
  ArrayAdapter<StringBuilder> adapter = (ArrayAdapter<StringBuilder>) spinner.getAdapter();
  StringBuilder stringBuilder = adapter.getItem(0);
  stringBuilder.delete(0, stringBuilder.length());
  stringBuilder.append(iconValue);
  adapter.notifyDataSetChanged();
}
 

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    ArrayAdapter a = (ArrayAdapter)lvItemList.getAdapter();
    CheckListItem temp = (CheckListItem) a.getItem(position);
    temp.setChecked(!temp.isChecked());
    a.notifyDataSetChanged();
}
 

@Override
protected void onPreExecute() {
    super.onPreExecute();
    progressDialog.show();
    //noinspection unchecked
    ArrayAdapter<Host> hosts = (ArrayAdapter<Host>) ((Spinner) findViewById(R.id.spinnerMirror)).getAdapter();
    host = hosts.getItem(((Spinner) findViewById(R.id.spinnerMirror)).getSelectedItemPosition());
    spinnerSeasonItemPosition = ((Spinner) findViewById(R.id.spinnerSeason)).getSelectedItemPosition();
    spinnerEpisodeItemPosition = ((Spinner) findViewById(R.id.spinnerEpisode)).getSelectedItemPosition();
}
 

@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    @SuppressWarnings("unchecked")
    ArrayAdapter<File> adapter = (ArrayAdapter<File>) mListView.getAdapter();
    File f = adapter.getItem(i);
    if (f.isDirectory()) {
        displayFolder(f);
        invalidateOptions();
    }
}
 

@Override
public void onReceive(Context context, Intent intent) {
    SwitchCompat bluetoothSwitch = container.findViewById(R.id.switch_bluetooth);
    TextView textBluetoothVisible = container.findViewById(R.id.bluetooth_visible);
    TextView textDeviceIdBluetooth = container.findViewById(R.id.device_id_bluetooth);
    TextView peopleNearbyText = container.findViewById(R.id.text_people_nearby);
    ProgressBar peopleNearbyProgress = container.findViewById(R.id.searching_people_nearby);
    if (bluetoothSwitch == null || textBluetoothVisible == null || textDeviceIdBluetooth == null
            || peopleNearbyText == null || peopleNearbyProgress == null
            || !BluetoothManager.ACTION_STATUS.equals(intent.getAction())) {
        return;
    }
    int status = intent.getIntExtra(BluetoothManager.EXTRA_STATUS, -1);
    Log.i(TAG, "BluetoothManager.EXTRA_STATUS: " + status);
    switch (status) {
        case BluetoothManager.STATUS_STARTING:
            bluetoothSwitch.setEnabled(false);
            textBluetoothVisible.setText(R.string.swap_setting_up_bluetooth);
            textDeviceIdBluetooth.setVisibility(View.VISIBLE);
            peopleNearbyText.setText(R.string.swap_scanning_for_peers);
            peopleNearbyText.setVisibility(View.VISIBLE);
            peopleNearbyProgress.setVisibility(View.VISIBLE);
            break;
        case BluetoothManager.STATUS_STARTED:
            bluetoothSwitch.setEnabled(true);
            textBluetoothVisible.setText(R.string.swap_visible_bluetooth);
            textDeviceIdBluetooth.setVisibility(View.VISIBLE);
            peopleNearbyText.setText(R.string.swap_scanning_for_peers);
            peopleNearbyText.setVisibility(View.VISIBLE);
            peopleNearbyProgress.setVisibility(View.VISIBLE);
            break;
        case BluetoothManager.STATUS_STOPPING:
            bluetoothSwitch.setEnabled(false);
            textBluetoothVisible.setText(R.string.swap_stopping);
            textDeviceIdBluetooth.setVisibility(View.GONE);
            if (!BonjourManager.isAlive()) {
                peopleNearbyText.setText(R.string.swap_stopping);
                peopleNearbyText.setVisibility(View.VISIBLE);
                peopleNearbyProgress.setVisibility(View.VISIBLE);
            }
            break;
        case BluetoothManager.STATUS_STOPPED:
            bluetoothSwitch.setEnabled(true);
            textBluetoothVisible.setText(R.string.swap_not_visible_bluetooth);
            textDeviceIdBluetooth.setVisibility(View.GONE);
            if (!BonjourManager.isAlive()) {
                peopleNearbyText.setVisibility(View.GONE);
                peopleNearbyProgress.setVisibility(View.GONE);
            }

            ListView peopleNearbyView = container.findViewById(R.id.list_people_nearby);
            if (peopleNearbyView == null) {
                break;
            }
            ArrayAdapter peopleNearbyAdapter = (ArrayAdapter) peopleNearbyView.getAdapter();
            for (int i = 0; i < peopleNearbyAdapter.getCount(); i++) {
                Peer peer = (Peer) peopleNearbyAdapter.getItem(i);
                if (peer.getClass().equals(BluetoothPeer.class)) {
                    Utils.debugLog(TAG, "Removing bluetooth peer: " + peer.getName());
                    peopleNearbyAdapter.remove(peer);
                }
            }
            break;
        case BluetoothManager.STATUS_ERROR:
            bluetoothSwitch.setEnabled(true);
            textBluetoothVisible.setText(intent.getStringExtra(Intent.EXTRA_TEXT));
            textDeviceIdBluetooth.setVisibility(View.VISIBLE);
            break;
        default:
            throw new IllegalArgumentException("Bad intent: " + intent);
    }
}
 

static
void setTitlesAndDrawerAndPage(Fragment fragment, int absolutePos)
{
    String[] navTitles = s_resources.getStringArray(R.array.navigation_titles);

    if(null != fragment)
    {
        switchToFragment(fragment, false);
    }

    ListView list = s_fragmentDrawer.m_listView;
    HeaderViewListAdapter headerAdapter = (HeaderViewListAdapter) list.getAdapter();
    int headers = headerAdapter.getHeadersCount();

    int listPosition = -10 == absolutePos ? s_viewPager.getCurrentItem() + headers : absolutePos;
    int viewPagerPos = -10 == absolutePos ? s_viewPager.getCurrentItem() : absolutePos - headers;

    // Check the drawer item.
    String title = PagerAdapterTags.s_tagList.get(0);
    String subTitle = null;
    int imageRes = R.drawable.ic_action_labels;

    if(s_fragmentFavourites.isVisible())
    {
        listPosition = 0;
        title = navTitles[0];
        imageRes = R.drawable.ic_action_important;
    }
    else if(s_fragmentManage.isVisible())
    {
        listPosition = 1;
        title = navTitles[1];
        imageRes = R.drawable.ic_action_storage;
    }
    else if(s_fragmentSettings.isVisible())
    {
        listPosition = 2;
        title = navTitles[2];
        imageRes = R.drawable.ic_action_settings;
    }
    else
    {
        ArrayAdapter<String[]> adapter = (ArrayAdapter<String[]>) headerAdapter.getWrappedAdapter();

        if(null != adapter && 0 < adapter.getCount())
        {
            String[] item = adapter.getItem(viewPagerPos);
            title = item[0];
            int count = null == item[1] || item[1].isEmpty() ? 0 : Integer.parseInt(item[1]);
            String countString = s_resources.getQuantityString(R.plurals.actionbar_subtitle_unread, count, count);
            subTitle = 0 == count ? null : countString;
        }
    }
    s_actionBar.setTitle(title);
    s_actionBar.setSubtitle(subTitle);
    s_actionBar.setIcon(imageRes);

    list.setItemChecked(listPosition, true);

    // If we must change the view pager page.
    if(0 <= viewPagerPos)
    {
        // Switch the view pager page if different.
        if(s_viewPager.getCurrentItem() != viewPagerPos)
        {
            s_viewPager.setCurrentItem(viewPagerPos);
        }
    }
}