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我想我已經從關於如何做到這一點的想法用盡。我正在建立和TODO應用程序與註冊和登錄功能。一旦用戶登錄，可以在SQLite（現在）中創建新的待辦事項任務，稍後我想刪除並重命名待辦事項。難以存儲共享首選項值爲SQLIte在Android中，並存儲空值
這是我用SQliteHelper創建的DB類。
public class DatabaseHelper extends SQLiteOpenHelper {
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "UserManager.db";
// User table name
private static final String TABLE_USER = "user";
// User Table Columns names
private static final String COLUMN_USER_ID = "user_id";
private static final String COLUMN_USER_NAME = "user_name";
private static final String COLUMN_USER_EMAIL = "user_email";
private static final String COLUMN_USER_PASSWORD = "user_password";
//Table mToDo task name
private final static String mTODO = "Todos";
//Todos table columns names
private final static String TASK_ID = "task_Id"; //autoincrement
private final static String user_Id = "userId";
private final static String TITLE = "title";
private final static String CONTENT = "content";
// create table sql query
private String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER + "("
+ COLUMN_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
COLUMN_USER_NAME + " TEXT,"
+ COLUMN_USER_EMAIL + " TEXT," + COLUMN_USER_PASSWORD + " TEXT" +
")";
private String CREATE_mTODO_TABLE = "CREATE TABLE " + mTODO + "("
+ TASK_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + user_Id + " TEXT NOT NULL,"
+ TITLE + " TEXT," + CONTENT + " TEXT" + ")";
// drop table sql query
private String DROP_USER_TABLE = "DROP TABLE IF EXISTS " + TABLE_USER;
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// this.ctx = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_USER_TABLE);
db.execSQL(CREATE_mTODO_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//Drop User Table if exist
db.execSQL(DROP_USER_TABLE);
// Create tables again
onCreate(db);
}
添加新的任務以第二臺
public void add(ToDo todoTask) {
SQLiteDatabase db = this.getWritableDatabase();
// SharedPreferences sp = PreferenceManager
// .getDefaultSharedPreferences(ctx);
// String d = sp.toString();
ContentValues values = new ContentValues();
values.put(TITLE, todoTask.getTitle());
values.put(CONTENT, todoTask.getContent());
// values.put(user_Id,todoTask.getUserID(d));
// Inserting Row
db.insert(mTODO, null, values);
db.close();
}
ToDo.java
public class ToDo {
private int id;
private String userID;
private String title;
private String content;
public ToDo(String content, int id, String title, String userID) {
this.content = content;
this.id = id;
this.title = title;
this.userID = userID;
}
public ToDo(String content, String title, String userID) {
this.content = content;
this.title = title;
this.userID = userID;
}
public ToDo() {
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getId(String name) {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getUserID(String userID) {
return userID;
}
public void setUserID(String userID) {
this.userID = userID;
}
}
添加活動類具有輸入和添加方法
public class addTask extends AppCompatActivity {
private EditText titleUser;
private EditText contentDesc;
private DatabaseHelper db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_task);
Button btnAdd = (Button) findViewById(R.id.addToDo);
titleUser = (EditText) findViewById(R.id.titleID);
contentDesc = (EditText) findViewById(R.id.contentDescId);
db = new DatabaseHelper(this);
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AddItem();
}
});
}
private void AddItem() {
ToDo todo = new ToDo();
todo.setTitle(titleUser.getText().toString().trim());
todo.setContent(contentDesc.getText().toString().trim());
db.add(todo);
finish();
}
時記錄的，我把該用戶ID共享偏好 在我的第二個表中的當前用戶我有這樣的事情
task_Id user_id title content
1 null Eat go to Mc
user_id是空在這裏，我不知道爲什麼
我想是這樣的
task_Id user_id title content
1 2 Eat go to Mc
user_id-應該是哪個用戶ID作出待辦事項
的IntelliJ阿米亞·，因爲沒有工作，我測試的是讓我評論 – Lwq