我很难获得sqlite的id。我有listview，然后我想得到一个sqlite表的id然后我可以在我想在完成测验后保存得分时使用它。
场景是这样的：用户创建用户名（或点击（如果曾创建用户名），在他/她点击其中一个用户名后再进行测验，完成后用户将获得分数然后分数被保存并可以查看以后。
数据库代码
public class DatabaseUsername extends SQLiteOpenHelper {
private static final String DATABASE_NAME="usernm.db";
private static final int SCHEMA_VERSION=1;
public DatabaseUsername(Context context) {
super(context, DATABASE_NAME, null, SCHEMA_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE almag (_id INTEGER PRIMARY KEY AUTOINCREMENT, nama TEXT, jekel TEXT);");
db.execSQL("CREATE TABLE score (_id INTEGER PRIMARY KEY AUTOINCREMENT, score INTEGER, userId INTEGER NOT NULL, FOREIGN KEY (userId) REFERENCES almag(_id) ON DELETE CASCADE);"); //create table score
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// no-op, since will not be called until 2nd schema
// version exists
}
public Cursor getAll() {
return(getReadableDatabase()
.rawQuery("SELECT _id, nama, jekel FROM almag ORDER BY nama",
null));
}
public Cursor getById(String id) {
String[] args={id};
return(getReadableDatabase()
.rawQuery("SELECT _id FROM almag WHERE _ID=?",
args));
}
public void insert(String nama, String jekel) {
ContentValues cv=new ContentValues();
cv.put("nama", nama);
cv.put("jekel", jekel);
getWritableDatabase().insert("almag", nama, cv);
}
public void insertScore (int score, int userId) {
ContentValues cv=new ContentValues();
cv.put("score", score);
cv.put("userId", userId);
getWritableDatabase().insert("score", null, cv);
}
public String getNama(Cursor c) {
return(c.getString(1));
}
public String getJekel(Cursor c) {
return(c.getString(2));
}
public static int getId (Cursor c) {
return(c.getInt(1));
}}
UsernameList.java
public class UsernameList extends ListActivity {
public final static String ID_EXTRA="com.rika.fyp.player";
Cursor model=null;
Cursor mode=null;
AlmagAdapter adapter=null;
EditText nama=null;
RadioGroup jekel=null;
DatabaseUsername helper=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.usernamelist);
helper=new DatabaseUsername(this);
nama=(EditText)findViewById(R.id.nama);
jekel=(RadioGroup)findViewById(R.id.jekel);
model=helper.getAll();
startManagingCursor(model);
adapter=new AlmagAdapter(model);
setListAdapter(adapter);
}
@Override
public void onDestroy() {
super.onDestroy();
helper.close();
}
public void onListItemClick(ListView parent, View view, int position, long id) {
Intent intent = new Intent(this, TheEndActivity.class);
Cursor cursor = (Cursor) adapter.getItem(position);
intent.putExtra("USER_ID", cursor.getInt(cursor.getColumnIndex("_id")));
startActivity(intent);
Intent i=new Intent(UsernameList.this, QuizAppActivity.class);
startActivity(i);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
new MenuInflater(this).inflate(R.menu.option, menu);
return(super.onCreateOptionsMenu(menu));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId()==R.id.add) {
startActivity(new Intent(UsernameList.this, UsernameRegister.class));
return(true);
}
return(super.onOptionsItemSelected(item));
}
private View.OnClickListener onSave=new View.OnClickListener() {
public void onClick(View v) {
String type=null;
switch (jekel.getCheckedRadioButtonId()) {
case R.id.pria:
type="Pria";
break;
case R.id.perempuan:
type="Perempuan";
break;
}
helper.insert(nama.getText().toString(), type);
model.requery();
}
};
class AlmagAdapter extends CursorAdapter {
AlmagAdapter(Cursor c) {
super(UsernameList.this, c);
}
@Override
public void bindView(View row, Context ctxt,Cursor c) {
AlmagHolder holder=(AlmagHolder)row.getTag();
holder.populateFrom(c, helper);
}
@Override
public View newView(Context ctxt, Cursor c, ViewGroup parent) {
LayoutInflater inflater=getLayoutInflater();
View row=inflater.inflate(R.layout.usernamerow, parent, false);
AlmagHolder holder=new AlmagHolder(row);
row.setTag(holder);
return(row);
}
}
static class AlmagHolder {
private TextView nama=null;
private TextView alamat=null;
private ImageView icon=null;
private View row=null;
AlmagHolder(View row) {
this.row=row;
nama=(TextView)row.findViewById(R.id.title);
icon=(ImageView)row.findViewById(R.id.icon);
}
void populateFrom(Cursor c, DatabaseUsername helper) {
nama.setText(helper.getNama(c));
if (helper.getJekel(c).equals("Pria")) {
icon.setImageResource(R.drawable.pria);
}
else if (helper.getJekel(c).equals("Perempuan")) {
icon.setImageResource(R.drawable.perempuan);
}
}
}}
TheEndActivity.java
public class TheEndActivity extends Activity implements OnClickListener {
protected int userId;
DatabaseUsername helper=null;
Object almagId=null;
int id;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.theendactivitylayout);
final SetGame currentGame = ((TheApplication)getApplication()).getCurrentGame();
String result = "Your Score is " + currentGame.getRight() + "/" + currentGame.getNumRounds() + ".. ";
final String comment = Mark.getResultComment(currentGame.getRight(), currentGame.getNumRounds(), getDifficultySettings());
userId = getIntent().getIntExtra("USER_ID", 0);
SQLiteDatabase db = (new DatabaseUsername(this)).getWritableDatabase();
final Cursor cursor = db.rawQuery("SELECT alm._id, alm.nama FROM almag alm WHERE emp._id = ?",
new String[]{""+userId});
TextView results = (TextView)findViewById(R.id.endgameResult);
results.setText(result + comment);
int image = Mark.getResultImage(currentGame.getRight(), currentGame.getNumRounds(), getDifficultySettings());
ImageView resultImage = (ImageView)findViewById(R.id.resultPage);
resultImage.setImageResource(image);
//handle button actions
Button finishBtn = (Button) findViewById(R.id.finishBtn);
Button answerBtn = (Button) findViewById(R.id.answerBtn);
finishBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
helper.insertScore(currentGame.getRight(), userId);
Intent i = new Intent(TheEndActivity.this, MainMenu.class);
startActivity(i);
}
});
answerBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(TheEndActivity.this, AnsActivity.class);
startActivityForResult(i, AppRule.PLAYBUTTON);
}
});
}
private int getDifficultySettings() {
SharedPreferences settings = getSharedPreferences(AppRule.SETTINGS, 0);
int diff = settings.getInt(AppRule.DIFFICULTY, 2);
return diff;
}
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_BACK :
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}}
我上面已经尝试过这些代码，但仍然可以获得id。我希望有一个人可以帮助我。
以下这些代码插入得分（在TheEndActivity.java中）
finishBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
helper.insertMark(currentGame.getRight(), userId );
Intent i = new Intent(TheEndActivity.this, MainMenu.class);
startActivity(i);
}
});
在Database.java中插入标记
public void insertMark(int score, int userId) {
ContentValues cv=new ContentValues();
cv.put("score", score);
cv.put("userId", userId);
getWritableDatabase().insert("score", null, cv);
}
答案 0 :(得分：0)
您是否尝试过使用long id代替int position？
public void onListItemClick(ListView parent, View view, int position, long id) {
Intent intent = new Intent(this, TheEndActivity.class);
Cursor cursor = (Cursor) adapter.getItem((int)id);
intent.putExtra("USER_ID", cursor.getInt(cursor.getColumnIndex("_id")));
startActivity(intent);
Intent i=new Intent(UsernameList.this, QuizAppActivity.class);
startActivity(i);
}
实际上，进一步看一下，甚至在这里点击数据库的意义何在？我认为当您将listview绑定到适配器时，默认情况下_id字段映射到listview的id字段。因此，使用id应该为您提供所需的ID，而不是命中数据库。
所以也许试试这个：
public void onListItemClick(ListView parent, View view, int position, long id) {
Intent intent = new Intent(this, TheEndActivity.class);
intent.putExtra("USER_ID", (int)id);
startActivity(intent);
Intent i=new Intent(UsernameList.this, QuizAppActivity.class);
startActivity(i);
}
我正在工作但没有Android环境设置，但我认为这应该有用。