1
我已经创建了一个应用程序，其中listview从数据库中填充。现在我想在烤面包中看到值的细节点击。我怎样才能得到点击行的数据？获取列表视图中选定行的数据
下面是我的.java网页..
public class ListviewActivity extends ListActivity{
ListView mListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.listlayout);
mListView=(ListView)findViewById(R.id.list);
DbAdapter dbHelper = new DbAdapter(this);
dbHelper.open();
// Get a Cursor for the list items
Cursor listCursor = dbHelper.fetchListItems();
startManagingCursor(listCursor);
// set the custom list adapter
setListAdapter(new MyListAdapter(this, listCursor));
mListView = getListView();
mListView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position,long id){
String val=(String)(mListView.getItemAtPosition(position));
Toast.makeText(ListviewActivity.this,position, Toast.LENGTH_SHORT).show();
}
});
}
当我点击某一行上的应用程序被强行以下错误关闭：
E/AndroidRuntime(13011): FATAL EXCEPTION: main
E/AndroidRuntime(13011): java.lang.ClassCastException: android.database.sqlite.SQLiteCursor
E/AndroidRuntime(13011): at com.android.pickuplistview.ListviewActivity$1.onItemClick(ListviewActivity.java:38)
E/AndroidRuntime(13011): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
E/AndroidRuntime(13011): at android.widget.ListView.performItemClick(ListView.java:3382)
E/AndroidRuntime(13011): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
E/AndroidRuntime(13011): at android.os.Handler.handleCallback(Handler.java:587)
E/AndroidRuntime(13011): at android.os.Handler.dispatchMessage(Handler.java:92)
E/AndroidRuntime(13011): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(13011): at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(13011): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(13011): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(13011): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(13011): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime(13011): at dalvik.system.NativeStart.main(Native Method)
我的DB适配器页面在这里给出：
public class DbAdapter {
private static final String DB_NAME = "ListData";
private static final String TABLE_ITEMS = "itemslist";
public static final String COL_ID = "_id";
public static final String COL_ITEMS = "items";
public static final String COL_NAME = "name";
public static final String COL_ADDRESS = "address";
public static final String COL_STATUS="status";
private static final int DB_VERSION = 1;
private final Context mCtx;
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String CREATE_DB_TABLE_DATES =
"CREATE TABLE "+TABLE_ITEMS+" ("+
COL_ID +" INTEGER PRIMARY KEY AUTOINCREMENT, "+
COL_ITEMS + " TEXT NOT NULL, " +
COL_NAME + " TEXT, " +
COL_ADDRESS + " TEXT, " +
COL_STATUS + " TEXT " +
");";
private static final String CREATE_TEST_DATA1 =
"INSERT INTO "+TABLE_ITEMS+
" ("+
COL_ITEMS+","+
COL_NAME+","+
COL_ADDRESS+","+
COL_STATUS+
") VALUES (" +
"'Gems',"+
"'KAJU',"+
"'Behala',"+
"'DELIVERED'"+
");";
private static final String CREATE_TEST_DATA2 =
"INSERT INTO "+TABLE_ITEMS+
" ("+
COL_ITEMS+","+
COL_NAME+","+
COL_ADDRESS+","+
COL_STATUS+
") VALUES (" +
"'Eclairs',"+
"'BIJU',"+
"'Joka',"+
"'PENDING'"+
");";
private static final String CREATE_TEST_DATA3 =
"INSERT INTO "+TABLE_ITEMS+
" ("+
COL_ITEMS+","+
COL_NAME+","+
COL_ADDRESS+","+
COL_STATUS+
") VALUES (" +
"'Donut',"+
"'RAJU',"+
"'Kasba',"+
"'DELIVERED'"+
");";
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_DB_TABLE_DATES);
db.execSQL(CREATE_TEST_DATA1);
db.execSQL(CREATE_TEST_DATA2);
db.execSQL(CREATE_TEST_DATA3);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// if the new version is higher than the old version,
// delete existing tables:
if (newVersion > oldVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_ITEMS);
onCreate(db);
} else {
// otherwise, create the database
onCreate(db);
}
}
}
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public DbAdapter(Context ctx) {
this.mCtx = ctx;
}
public DbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
public Cursor fetchListItems() {
Cursor cursor =
mDb.query(TABLE_ITEMS, new String[]
{COL_ID, COL_ITEMS, COL_NAME, COL_ADDRESS, COL_STATUS},
null, null, null, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
}
return cursor;
}
}
如何做到这一点??请给我exmaple或它会更好，如果你编辑我的code.I'm非常ameteur在android.Looking向前为您的帮助。请。 – 2013-05-13 13:46:24
看看上面的 – Guardanis 2013-05-13 13:51:35
我已附上我的数据库页面...请检查它 – 2013-05-13 13:59:42