登录页面后,我想在列表视图中显示A代表Apple,B代表Boy..ect.但是在我的应用程序中,我完全登录成功,仅登录表已完全创建成功,但未创建mainmenu.
i try this code
if(username.length()>0&&password.length()>0)
{
sqliteAdapter db=new sqliteAdapter(Main.this);
db.openToWrite();
if(db.Login(username,password))
{
System.out.println("goutham");
Intent intent=new Intent(getApplicationContext(),ExampleActivity.class);
startActivity(intent);
}
sqliteAdapter.java
public class sqliteAdapter {
public static final String MYDATABASE_NAME = "test";
public static final String KEY_USERNAME = "username";
public static final String KEY_PASSWORD = "password";
public static final String MYDATABASE_TABLE = "mainmenu";
private static final String DATABASE_TABLE = "login";
public static final int MYDATABASE_VERSION = 1;
public static final String KEY_ID = "_id";
public static final String KEY_CONTENT = "Content";
// create table MY_DATABASE (ID integer primary key, Content text not null);
private static final String SCRIPT_CREATE_DATABASE = "create table "
+ MYDATABASE_TABLE + " (" + KEY_ID
+ " integer primary key autoincrement, " + KEY_CONTENT
+ " text not null);";
private static final String DATABASE_CREATE = "create table login (_id integer primary key autoincrement, "
+ "username text not null, " + "password text not null);";
private sqliteHelper sqliteHelper;
private sqliteDatabase sqliteDatabase;
private Context context;
public sqliteAdapter(Context c) {
context = c;
}
public sqliteAdapter openToRead() throws android.database.sqlException {
sqliteHelper = new sqliteHelper(context, MYDATABASE_NAME, null,
MYDATABASE_VERSION);
sqliteDatabase = sqliteHelper.getReadableDatabase();
return this;
}
public sqliteAdapter openToWrite() throws android.database.sqlException {
sqliteHelper = new sqliteHelper(context, MYDATABASE_NAME, null,
MYDATABASE_VERSION);
sqliteDatabase = sqliteHelper.getWritableDatabase();
return this;
}
public void close() {
sqliteHelper.close();
}
public long insert(String content) {
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_CONTENT, content);
return sqliteDatabase.insert(MYDATABASE_TABLE, null, contentValues);
}
public int deleteall() {
return sqliteDatabase.delete(MYDATABASE_TABLE, null, null);
}
public Cursor queueAll() {
String[] columns = new String[] { KEY_ID, KEY_CONTENT };
Cursor cursor = sqliteDatabase.query(MYDATABASE_TABLE, columns, null,
null, null, null, null);
return cursor;
}
private static class sqliteHelper extends sqliteOpenHelper {
public sqliteHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
}
@Override
public void onCreate(sqliteDatabase db) {
// Todo Auto-generated method stub
db.execsql(SCRIPT_CREATE_DATABASE);
db.execsql(DATABASE_CREATE);
}
@Override
public void onUpgrade(sqliteDatabase db, int oldVersion, int newVersion) {
// Todo Auto-generated method stub
}
}
public long AddUser(String username, String password) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_USERNAME, username);
initialValues.put(KEY_PASSWORD, password);
return sqliteDatabase.insert(DATABASE_TABLE, null, initialValues);
}
public boolean Login(String username, String password) {
// Todo Auto-generated method stub
Cursor mCursor = sqliteDatabase.rawQuery("SELECT * FROM "
+ DATABASE_TABLE + " WHERE username=? AND password=?",
new String[] { username, password });
if (mCursor != null) {
if (mCursor.getCount() > 0) {
return true;
}
}
return false;
}
}
ExampleActivity.java
public class ExampleActivity extends Activity {
private sqliteAdapter MysqLiteAdapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView listContent = (ListView) findViewById(R.id.contentlist);
/*
* Create/Open a sqlite database and fill with dummy content and close
* it
*/
MysqLiteAdapter = new sqliteAdapter(this);
MysqLiteAdapter.openToWrite();
// MysqLiteAdapter.deleteall();
MysqLiteAdapter.insert("A for Apply");
MysqLiteAdapter.insert("B for Boy");
MysqLiteAdapter.insert("C for Cat");
MysqLiteAdapter.insert("D for Dog");
MysqLiteAdapter.insert("E for Egg");
MysqLiteAdapter.insert("F for Fish");
MysqLiteAdapter.close();
/*
* Open the same sqlite database and read all it's content.
*/
MysqLiteAdapter = new sqliteAdapter(this);
MysqLiteAdapter.openToRead();
Cursor cursor = MysqLiteAdapter.queueAll();
startManagingCursor(cursor);
String[] from = new String[] { sqliteAdapter.KEY_CONTENT };
int[] to = new int[] { R.id.text };
SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this,
R.layout.row, cursor, from, to);
listContent.setAdapter(cursorAdapter);
MysqLiteAdapter.close();
}
}
在运行程序登录表仅在数据库中创建但mainmenu表未在数据库中创建之后.运行程序后,它显示错误,例如sqlite返回代码= 1 MY_TABLE中没有这样的表
解决方法:
/ *这是数据库类* /
public String getData1() throws sqlException{
// Todo Auto-generated method stub
String[] columns1 = new String[] { KEY_DATE };
Cursor c1 = ourDatabase.query(DATABASE_MARKSTABLE, columns1, null, null, null,
null, KEY_ENDINGTIME+" DESC", " 30");
String result1 = "";
int isName = c1.getColumnIndex(KEY_DATE);
for (c1.movetoFirst(); !c1.isAfterLast(); c1.movetoNext()) {
result1 = result1 + c1.getString(isName)
+ " " + "\n";
}
c1.close();
return result1;
}
http://www.technotalkative.com/android-%E2%80%93-listview-%E2%80%93-2-custom-listview/
