标题可能有些混乱，但这就是我要面对的问题
我有一堂课：
public abstract class BaseFragmentActivity<T> extends FragmentActivity {
static final int PROGRESS_DIALOG = 0;
Dialog progessDialog;
public abstract void displayData(T output);
@Override
protected Dialog onCreateDialog(int id) {
if (id == PROGRESS_DIALOG) {
ProgressDialog progressDialog = ProgressDialog.show(this, "",
"Loading. Please wait...", true);
progessDialog = progressDialog;
}
return progessDialog;
}
class PerformOPTask extends AsyncTask<Void, String, T> {
// connector=new JSONConnector();
Connector connector;
String curUrl;
Class<T> clazz;
PerformOPTask(String url, Class<T> curClazz) {
//connector = new UnitTestConnector();
connector = new JSONConnector();
curUrl = url;
clazz = curClazz;
}
@Override
protected T doInBackground(Void... params) {
return connector.getData(URLUtils.getFormattedUrl(curUrl),clazz);
}
@Override
protected void onPostExecute(T output) {
displayData(output);
}
}
}
然后我有一个子类为：
public abstract class BaseListFragmentActivity<T> extends BaseFragmentActivity<T> implements OnItemClickListener, OnClickListener{
protected ListView mList;
/** Called when the activity is first created. */
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.table_list);
CommonUtil.getActionBarWithBackButton(this,getLayoutInflater());
mList=(ListView)findViewById(R.id.table_list_listView);
mList.setOnItemClickListener(this);
}
public void onBackABButtonPressed(View view) {
finish();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
@Override
public abstract void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3);
}
现在，我将扩展此类，如下所示：
public class ListAccountsActivity<T> extends BaseListFragmentActivity<AccountData> {
protected Acct[] mItems;
private String[] mIcons;
protected boolean displayHandledBySubClass=false;
/** Called when the activity is first created. */
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
new PerformOPTask(getString(R.string.get_account),AccountData.class).execute();
showDialog(PROGRESS_DIALOG);
//.getData(URLUtils.getFormattedUrl(getString(R.string.get_account)),actData);
}
@Override
public void onItemClick(AdapterView<?> lv, View view, int position, long id) {
// super.onListItemClick(l, v, position, id);
// Get the item that was clicked
Acct account = (Acct) mList.getAdapter().getItem(position);
Intent intent=new Intent(this,AccountDetailViewActivity.class);
intent.putExtra("selectedAccount",account);
startActivity(intent);
}
@Override
public void displayData(AccountData output){
if(displayHandledBySubClass){
//handle display in subclass
handleDisplayData(output);
}
else {
Acct[] accountArray = new Acct[output.getAccount().size()];
mItems = output.getAccount().toArray(accountArray);
IWMArrayAdapter<Acct> adapter = new IWMArrayAdapter<Acct>(this, mItems);
adapter.setIcons(mIcons);
adapter.setArrowNeeded();
//mList is superClassVariable
mList.setAdapter(adapter);
dismissDialog(PROGRESS_DIALOG);
adapter.notifyDataSetChanged();
}
}
public void handleDisplayData(T output){
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//Toast.makeText(this, "Tapped search", Toast.LENGTH_SHORT).show();
super.onCreateOptionsMenu(menu);
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.list_servers_menu, menu);
// Calling super after populating the menu is necessary here to ensure
// that the
// action bar helpers have a chance to handle this event.
return true;
}
}
我的问题是我可以通过某种方式使handleDisplayData通用，以便可以将任何类型传递给它。我想要做的是尽可能重用BaseListFragmentActivity中的逻辑，并处理该类/子类中ListAccountsActivity或其子类的唯一任务。
我希望我的问题很清楚，谢谢您的帮助
最佳答案
如果我理解正确，则希望能够从子类的基础使用特定于类型的方法，为此，您需要使所有内容通用：
public abstract class GenericBase<T> { ... }
public abstract class ExtendedGeneric<T> extends GenericBase<T> { ... }
public class ExtendedGenericSub<T> extends ExtendedGeneric<T> { ... }
关键是，如果
ExtendedGeneric扩展GenericBase<DataOutput>，则只能从GenericBase<DataOutput>访问ExtendedGeneric的方法。