Question

我重写了函数getView（），但是当调试我发现它永远不会被调用时，真的很奇怪......

public class EntriesActivity extends ListActivity {
 private static final String TAG = "EntriesActivity";

 private EntriesAdapter mArrayAdapter;
 private List<Entry> mEntries = new ArrayList<Entry>();

 String mGoalId;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);

  setContentView(R.layout.entries_activity);

  Bundle extras = getIntent().getExtras();
  mGoalId = extras.getString("goal_id");

  mArrayAdapter = new EntriesAdapter(this);
  setListAdapter(mArrayAdapter);

  new EntriesRefreshTask().execute();

 } 

 class EntriesAdapter extends ArrayAdapter<Entry> {
  Activity context;

  EntriesAdapter(Activity context) {
   super(context, R.layout.entries_row, mEntries);

   this.context = context;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   Log.v("EntriesActivity", position + "");
   LayoutInflater inflater = context.getLayoutInflater();
   View row = inflater.inflate(R.layout.entries_row, null);
   TextView title = (TextView) row.findViewById(R.id.entry_title);
   TextView name = (TextView) row.findViewById(R.id.entry_name);
   TextView content = (TextView) row.findViewById(R.id.entry_content);

   Entry e = EntriesActivity.this.mEntries.get(position);
   title.setText(e.getTitle());
   name.setText(e.getName());
   content.setText(e.getContent());

   return (row);

  }
 }

 private class EntriesRefreshTask extends AsyncTask<Void, Void, Boolean> {
  private static final String TAG = "EntriesRefreshTask";
  private static final boolean DEBUG = Things43Settings.DEBUG;

  private Things43HttpApi mHApi = ((Things43App) getApplication())
    .getHttpApi();

  @Override
  protected void onPreExecute() {
   if (DEBUG)
    Log.d(TAG, "onPreExecute()");
   // showProgressDialog("load");
   Toast.makeText(EntriesActivity.this, "Loading entries...",
     Toast.LENGTH_LONG).show();
  }

  @Override
  protected Boolean doInBackground(Void... params) {
   if (DEBUG)
    Log.d(TAG, "doInBackground()");
   try {

    // GoalActivity.this.
    getEntries(mGoalId);
    return true;

   } catch (Exception e) {
    if (DEBUG)
     Log.d(TAG, "Caught Exception logging in.", e);
    // Preferences.logoutUser(foursquare, editor);
    return false;
   }
  }

  @Override
  protected void onPostExecute(Boolean success) {
   try {
    if (success) {
     Log.d(TAG, "success");
     mArrayAdapter.notifyDataSetChanged();

    } else {
     Toast.makeText(EntriesActivity.this,
       R.string.request_failed_toast, Toast.LENGTH_LONG)
       .show();
     mArrayAdapter.notifyDataSetChanged();
    }
   } catch (Exception e) {
    if (DEBUG)
     Log.d(TAG, "GoalActivity:onPostExecute():", e);
   }
   // dismissProgressDialog();
  }

  @Override
  protected void onCancelled() {
   // dismissProgressDialog();
  }

  public boolean getEntries(String goal_id) {

   ArrayList<Entry> entries = mHApi.GetGoalEntries(mGoalId);
   Log.v(TAG, entries.size() + "");
   if (entries.size() > 0) {

    mEntries = entries;
   }

   return true;
  }

 }

Answer 1

我认为你还必须在你的适配器上覆盖'getCount（）'方法（我通常也会覆盖getItem（）和getItemId（），因为它们可能不是必需的。）

如果不这样做，那么ListView认为您的数据源不包含任何元素，那么为什么还要在相关的适配器上调用getView。

android listview问题，覆盖getView（）但它永远不会被调用

1 个答案: