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What is a NullPointerException, and how do I fix it?_x000D_
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NullPointerException in Java when using an object as a field_x000D_
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public class CatalogActivity extends AppCompatActivity implements
LoaderManager.LoaderCallbacks {
private static final int PRODUCT_LOADER = 0;
ProductCursorAdapter mCursorAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_catalog);
ListView productsListView = (ListView) findViewById(R.id.list);
View emptyView = findViewById(R.id.empty_view);
productsListView.setEmptyView(emptyView);
ProductCursorAdapter mCursorAdapter = new ProductCursorAdapter(this, null);
productsListView.setAdapter(mCursorAdapter);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(CatalogActivity.this, AddProductActivity.class);
startActivity(intent);
}
});
productsListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView adapterView, View view, int position, long id) {
Intent intent = new Intent(CatalogActivity.this, DetailEditActivity.class);
Uri currentProductUri = ContentUris.withAppendedId(ProductContract.ProductEntry.CONTENT_URI, id);
intent.setData(currentProductUri);
startActivity(intent);
}
});
Log.e("working fine" , "product");
getSupportLoaderManager().initLoader(PRODUCT_LOADER, null, this);
}
And the onLoadFinished() method is :
public void onLoadFinished(Loader loader, Cursor data) {
mCursorAdapter.swapCursor(data);
}
I keep receiving the error as following :
java.lang.NullPointerException: Attempt to invoke virtual method 'android.database.Cursor com.example.android.gloryinventory.ProductCursorAdapter.swapCursor(android.database.Cursor)' on a null object reference
Is there's something wrong with my code?
Thanks in advance.
Posted on 16 Aug 2022, this text provides information on IoT Frameworks related to Internet of Things. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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Because you are creating ProductCursorAdapter mCursorAdapter within the context of the class but initializing another local variable instead of that one in your onCreate. Here is the problematic line:
ProductCursorAdapter mCursorAdapter = new ProductCursorAdapter(this, null);
which should be:
mCursorAdapter = new ProductCursorAdapter(this, null);
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Best Answer
2 years ago
_x000D_ Because you are creating ProductCursorAdapter mCursorAdapter within the context of the class but initializing another local variable instead of that one in your onCreate. Here is the problematic line: ProductCursorAdapter mCursorAdapter = new ProductCursorAdapter(this, null); which should be: mCursorAdapter = new ProductCursorAdapter(this, null);