因此,在此代码中,我试图根据通过我的showResults()
传递的查询来检索游标,然后创建adapter
和loadermanager
。我觉得问题是由于我的SimpleCursorAdapter
构造函数中的布局和id导致的,因为在创建布局和标识时错误开始了。我使用Log和if语句来查看它是否为null,并且没有任何内容显示在logcat上,因此必须使用光标来表示。NullPointerException当我运行此代码
public class SearchResultsActivity extends FragmentActivity implements LoaderManager.LoaderCallbacks<Cursor> {
private ListView list;
private DatabaseTable db;
private SimpleCursorAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_results);
db = new DatabaseTable(this);
handleIntent(getIntent());
}
public void onNewIntent(Intent intent) {
setIntent(intent);
handleIntent(intent);
}
private void handleIntent(Intent intent) {
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
showResults(query);
}
}
private void showResults(String query) {
db = new DatabaseTable(this);
Cursor cursor = db.getContactMatches(query, null);
list = (ListView)findViewById(android.R.id.list);
mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1,
null, new String[] {DatabaseTable.COL_NAME}, new int[] {android.R.id.text1}, 0);
getLoaderManager().initLoader(0, null, this);
list.setAdapter(mAdapter);
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent contactIntent = new Intent(getApplicationContext(), ContactActivity.class);
contactIntent.setData(getIntent().getData());
startActivity(contactIntent);
}
});
}
哪一行,你在得到错误? – mango
也发布您的logcat输出。 – Kanth
再次,我不完全确定是否是导致问题的id和布局,即使我这样做,我也不知道如何将布局设置为simple_list_item_1,类似于您对id中的id所做的操作xml文件 –