SimpleCursorAdapter 和 ListView 问题
我在列表视图中显示数据库中的记录时遇到问题。这是我的代码
public class FirstTab extends ListActivity {
private DatabaseHelper dbhelper;
@Override
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.first);
dbhelper = new DatabaseHelper(getApplicationContext());
Cursor cursor = dbhelper.getAllNotes();
startManagingCursor(cursor);
String[] columns = new String[] {DatabaseHelper.colTitle , DatabaseHelper.colDate};
int[] to = new int[] { android.R.id.text1, android.R.id.text2};
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, cursor, columns, to);
setListAdapter(mAdapter);
}
}
，
...
public Cursor getAllNotes()
{
SQLiteDatabase db=this.getReadableDatabase();
return db.query(noteTable, new String [] {colTitle, colDesc, colDate}, null, null, null, null, null);
}
...
如果您需要更多，这里是 repo https://github.com/grzegorz-l/ myHomeworks
当我启动我的应用程序时，它从一开始就崩溃（RuntimeException）。如果我在 onCreate 方法中注释最后 2 行，它会运行，但 ofc 不会显示任何内容。
预先感
谢格雷格
I have a problem displaying an records from my db in listview. This is my code
public class FirstTab extends ListActivity {
private DatabaseHelper dbhelper;
@Override
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.first);
dbhelper = new DatabaseHelper(getApplicationContext());
Cursor cursor = dbhelper.getAllNotes();
startManagingCursor(cursor);
String[] columns = new String[] {DatabaseHelper.colTitle , DatabaseHelper.colDate};
int[] to = new int[] { android.R.id.text1, android.R.id.text2};
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, cursor, columns, to);
setListAdapter(mAdapter);
}
}
and
...
public Cursor getAllNotes()
{
SQLiteDatabase db=this.getReadableDatabase();
return db.query(noteTable, new String [] {colTitle, colDesc, colDate}, null, null, null, null, null);
}
...
if you need more , here is repo https://github.com/grzegorz-l/myHomeworks
When i start my app it crash at the beggining (RuntimeException). If I comment 2 last lines in onCreate method it run but ofc doesn't show anything.
Thanks in advance
Greg
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创建 SimpleCursorAdapter 时不要传递
getApplicationContext()。请使用this代替，即 ListActivity 的上下文。Don't pass
getApplicationContext()when creating SimpleCursorAdapter. Usethisinstead, i.e., the context of your ListActivity.您的 FirstTab.java 文件正在扩展 ListActivity。这意味着它的布局文件必须包含一个 ListView，其 android:id 设置为：
另外，您的 FirstTab.java 的布局指向 note_entry.xml。它应该指向其中具有上述描述的 ListView 的布局，或者不由 ListActivity 扩展。
Your FirstTab.java file is extending a ListActivity. This means that it's layout file has to contain a ListView with android:id set to:
Also, your FirstTab.java has it's layout pointing to note_entry.xml. It should either point to a layout which has a ListView of above description in it or not be extended by a ListActivity.