LoaderManager
メソッドを使用してgetLoaderManager().initLoader()
メソッドを呼び出すと、誤った第3引数型のエラーが発生します。私はthis
を第3引数として渡します。誰も私にこのエラーが出ている理由を教えてもらえますか?私はonCreate()
メソッドの最後にLoaderManager
を呼び出しました。ここでは以下の私のコードは次のとおりです。ローダーマネージャエラー
public class CatalogActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> {
private static final int PET_LOADER = 0;
PetCursorAdapter mCursorAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_catalog);
// Setup FAB to open EditorActivity
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(CatalogActivity.this, EditorActivity.class);
startActivity(intent);
}
});
// Find the ListView which will be populated with the pet data
ListView petListView = (ListView) findViewById(R.id.list);
// Find and set empty view on the ListView, so that it only shows when the list has 0 items.
View emptyView = findViewById(R.id.empty_view);
petListView.setEmptyView(emptyView);
mCursorAdapter = new PetCursorAdapter(this, null);
petListView.setAdapter(mCursorAdapter);
petListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Intent intent = new Intent(CatalogActivity.this, EditorActivity.class);
Uri currentPetUri = ContentUris.withAppendedId(PetEntry.CONTENT_URI, id);
intent.setData(currentPetUri);
startActivity(intent);
}
});
getLoaderManager().initLoader(PET_LOADER, null, this);
}
private void insertPet() {
ContentValues values = new ContentValues();
values.put(PetEntry.COLUMN_NAME, "Toto");
values.put(PetEntry.COLUMN_BREED, "Terrier");
values.put(PetEntry.COLUMN_GENDER, PetEntry.GENDER_MALE);
values.put(PetEntry.COLUMN_WEIGHT, 7);
Uri newUri = getContentResolver().insert(PetEntry.CONTENT_URI, values);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu options from the res/menu/menu_catalog.xml file.
// This adds menu items to the app bar.
getMenuInflater().inflate(R.menu.menu_catalog, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// User clicked on a menu option in the app bar overflow menu
switch (item.getItemId()) {
// Respond to a click on the "Insert dummy data" menu option
case R.id.action_insert_dummy_data:
insertPet();
return true;
// Respond to a click on the "Delete all entries" menu option
case R.id.action_delete_all_entries:
// Do nothing for now
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
String[] projection = {PetEntry._ID,
PetEntry.COLUMN_NAME,
PetEntry.COLUMN_BREED};
return new CursorLoader(this,
PetEntry.CONTENT_URI,
projection,
null,
null,
null);
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
mCursorAdapter.swapCursor(data);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
mCursorAdapter.swapCursor(null);
}
}
どのLoaderManager.LoaderCallbacksが実装していますか? 'android.app'、または' android.support.v4.app'からのものですか? – clownba0t
うん、 'android.support.v4.app.LoaderManager' – mani