是的我知道这个问题已经被问了很多但似乎我检查的所有问题并没有解决我的问题。所以我会直截了当地说。
这是数据库类
SQLHandler.java
public class SQLHandler {
public static final String KEY_ROOMMOVEHOLDER = "roommoveholder";
public static final String KEY_ROOM = "room";
public static final String KEY_ROOMWEIGHT = "roomweight";
public static final String KEY_MOVENAME = "movename";
public static final String KEY_ID1 = "_id";
public static final String KEY_ID2 = "_id";
public static final String KEY_MOVEDATE = "movedate";
public static final String KEY_TOTALMOVEWEIGHT = "totalmoveweight";
public static final String KEY_TOTALITEM = "totalitem";
private static final String DATABASE_NAME = "mymovingfriend";
private static final int DATABASE_VERSION = 1;
public static final String KEY_TODOMOVE = "todomove";
private static final String DATABASE_TABLE1 = "movingname";
private static final String DATABASE_TABLE2 = "movingrooms";
public static final String CREATE_TABLE_1 = "CREATE TABLE " + DATABASE_TABLE1 + " (" +
KEY_ID1 + " INTEGER PRIMARY KEY AUTOINCREMENT," +
KEY_MOVEDATE + " TEXT NOT NULL, " +
KEY_TOTALMOVEWEIGHT + " TEXT NOT NULL, " +
KEY_TOTALITEM + " INTEGER NOT NULL, " +
KEY_MOVENAME + " TEXT NOT NULL);";
public static final String CREATE_TABLE_2 = "CREATE TABLE " + DATABASE_TABLE2 + " (" +
KEY_ID2 + " INTEGER PRIMARY KEY AUTOINCREMENT," +
KEY_ROOMMOVEHOLDER + " TEXT NOT NULL, " +
KEY_ROOMWEIGHT + " TEXT NOT NULL, " +
KEY_ROOM + " TEXT NOT NULL);";
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(CREATE_TABLE_1);
db.execSQL(CREATE_TABLE_2);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE1);
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE2);
onCreate(db);
}
}
public SQLHandler(Context c){
ourContext = c;
}
public SQLHandler open() throws SQLException{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
public void renameRoom(String movename, String roomname){
ContentValues cv = new ContentValues();
cv.put(KEY_ROOM, roomname);
ourDatabase.update(DATABASE_TABLE2, cv, KEY_ROOMMOVEHOLDER + "='" + movename + "'" + " AND " + KEY_ROOM + "='" + roomname + "'", null);
}
}
这是我的活动
StartMoving.java
public class StartMoving extends Activity {
Button returnBack, addmove, set, setCancel;
SQLHandler startmoving;
EditText newMove;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.start_moving);
initializer();
itemInitializer();
Intent i = getIntent();
currentMove = i.getStringExtra("moveName");
buttonLoad();
currentMoveName.setText(currentMove);
currentRoom = "None";
roomName.setText(currentRoom);
buttonSet();
itemButton();
checktodo();
roomSpinner();
SharedPreferences tut_pref = PreferenceManager.getDefaultSharedPreferences(StartMoving.this);
btut = tut_pref.getString("gettut", "null");
if (btut.equals("yes")) {
AlertDialog help1 = new AlertDialog.Builder(StartMoving.this).show();
help1.setContentView(R.layout.add_room_tut);
next = true;
managehelp = true;
tut_pref = PreferenceManager.getDefaultSharedPreferences(StartMoving.this);
SharedPreferences.Editor tut = tut_pref.edit();
tut.putString("gettut", "no");
tut.commit();
}else {
}
}
private void buttonLoad() {
try {
ArrayList<String> sb = startmoving.loadRooms(currentMove);
String[] rb = (String[]) sb.toArray(new String[sb.size()]);
for (int i = 0; i < rb.length; i++) {
final Button nb = new Button(StartMoving.this);
nb.setText(rb[i]);
row.addView(nb);
nb.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
currentRoom = nb.getText().toString();
roomName.setText(currentRoom);
String displayname = startmoving.getItemName(currentMove, currentRoom);
String displayvalue = startmoving.getItemValue(currentMove, currentRoom);
String displayweight = startmoving.getItemWeightLBS(currentMove, currentRoom);
String displaytotalweight = startmoving.getTotalWeightLBS(currentMove);
String displayroomweight = startmoving.getRoomWeightLBS(currentMove, currentRoom);
int displaytotalitem = startmoving.getTotalItem(currentMove);
roomContent.setText(displayname);
itemValue.setText(displayvalue);
itemWeight.setText(displayweight);
totalweight.setText(displaytotalweight);
roomweight.setText(displayroomweight);
totalitem.setText("" + displaytotalitem);
}
});
}
addRooms.addView(row);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void initializer() {
startmoving = new SQLHandler(StartMoving.this);
startmoving.open();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_main, menu);
return true;
}
@SuppressLint("SdCardPath")
@SuppressWarnings({ "deprecation" })
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
boolean retval = true;
switch (item.getItemId()) {
case R.id.menu_rename:
final View view;
LayoutInflater inf = LayoutInflater.from(StartMoving.this);
view = inf.inflate(R.layout.rename, null);
final EditText newname = (EditText) view.findViewById(R.id.etNewRoomName);
new AlertDialog.Builder(StartMoving.this)
.setView(view)
.setTitle("Rename")
.setMessage("Enter new name for room " + currentRoom)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if (currentRoom.equals(newname.getText().toString())) {
Toast.makeText(StartMoving.this, "This name is already present. Please enter another name", Toast.LENGTH_LONG).show();
}else{
try {
String newroomname = newname.getText().toString();
startmoving.renameRoom(currentMove, newroomname);
// Intent intent = getIntent();
// finish();
// startActivity(intent);
} catch (Exception e) {
String error = e.toString();
Toast.makeText(StartMoving.this, error, Toast.LENGTH_SHORT).show();
}
}
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
})
.show();
break;
default:
break;
}
return retval;
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
startmoving.close();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onRestoreInstanceState(savedInstanceState);
roomName.setText("Hello world");
}
public void onBackPressed(){
super.onBackPressed();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
// do something on back.
if (check == 1) {
merge.setVisibility(View.GONE);
main.setVisibility(View.VISIBLE);
check = 0;
}else if (check == 2) {
main.setVisibility(View.VISIBLE);
roomButtons.setVisibility(View.GONE);
check = 0;
}else {
// this.finish();
Intent i = new Intent(StartMoving.this, ListMovingNames.class);
startActivity(i);
}
return true;
}
return super.onKeyDown(keyCode, event);
}
}
答案 0 :(得分：0)
更改您的关闭方法，如下所示：
public void close(){
ourDatabase.close();
}
答案 1 :(得分：0)
您的更改方法未关闭SQLiteDatabase引用。 Fist将其关闭，然后关闭DbHelper引用，如下所示：
public void close(){
ourDatabase.close();
ourHelper.close();
}
答案 2 :(得分：0)
请尝试:(在你的DbHelper的密切方法中）
public void close(){
ourDatabase.close();
ourHelper.close();
}
您需要关闭可写数据库，然后关闭帮助程序。
更新尝试：
String[] whereClause = {movename, roomname};
ourDatabase.update(DATABASE_TABLE2, cv, KEY_ROOMMOVEHOLDER + "=? AND " + KEY_ROOM + "=?", whereClause);
updaet语句使用预准备语句。