我正在创建一个 SQLiteDatabase,我能够将所有 EditText 值添加到数据库中,但是当尝试添加我使用 DatePicker 查找并输入到 TextView 的日期时,应用程序崩溃了。
是否有不同的方法将 TextView 值插入 SQLiteDatabase。
主要 Activity :
public class MainActivity extends AppCompatActivity implements DatePickerDialog.OnDateSetListener {
DatabaseHelper peopleDB;
TextView etDate;
Button btnAddData, btnViewData;
EditText etName, etEmail, etAddress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
peopleDB = new DatabaseHelper(this);
etName = (EditText) findViewById(R.id.editName);
etEmail = (EditText) findViewById(R.id.editEmail);
etAddress = (EditText) findViewById(R.id.editAddress);
etDate = (TextView) findViewById(R.id.textView4);
btnAddData = (Button) findViewById(R.id.btnAddData);
btnViewData = (Button) findViewById(R.id.btnViewData);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
DialogFragment datePicker = new DatePickerFragment();
datePicker.show(getSupportFragmentManager(), "date picker");
}
});
AddData();
ViewData();
}
public void AddData() {
btnAddData.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String name = etName.getText().toString();
String email = etEmail.getText().toString();
String tvShow = etAddress.getText().toString();
String date = etDate.getText().toString();
boolean insertData = peopleDB.addData(name, email, tvShow, date);
if (insertData == true) {
Toast.makeText(MainActivity.this, "Data Successfully Inserted!", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "Something went wrong :(.", Toast.LENGTH_LONG).show();
}
}
});
}
@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month);
c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
String currentDateString = DateFormat.getDateInstance(DateFormat.FULL).format(c.getTime());
TextView textView = (TextView) findViewById(R.id.textView4);
textView.setText(currentDateString);
}
public void ViewData() {
btnViewData.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Cursor data = peopleDB.showData();
if(data.getCount() == 0) {
display("Error", "No Data Found.");
return;
}
//display message
String datestring = etDate.getText().toString();
StringBuffer buffer = new StringBuffer();
while (data.moveToNext()){
buffer.append("ID: " + data.getString(0) + "\n");
buffer.append("Name: " + data.getString(1) + "\n");
buffer.append("Email: " + data.getString(2) + "\n");
buffer.append("Address: " + data.getString(3) + "\n");
buffer.append("Date: " + data.getString(4) + "\n");
}
display("All Stored Data:", buffer.toString());
}
});
}
数据库助手 Activity :
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "people.db";
public static final String TABLE_NAME = "people_table";
public static final String COL1 = "ID";
public static final String COL2 = "NAME";
public static final String COL3 = "EMAIL";
public static final String COL4 = "ADDRESS";
public static final String COL5 = "DATE";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
" NAME TEXT, EMAIL TEXT, ADDRESS TEXT)";
db.execSQL(createTable);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
public boolean addData(String name, String email, String address, String date){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL2, name);
contentValues.put(COL3, email);
contentValues.put(COL4, address);
contentValues.put(COL5, date);
long result = db.insert(TABLE_NAME, null, contentValues);
if (result == -1) {
return false;
}
else {
return true;
}
}
public Cursor showData(){
SQLiteDatabase db = this.getWritableDatabase();
Cursor data = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
return data;
}
}
最佳答案
我认为您没有在创建数据库语句中添加日期列,因此请在 DatabaseHelper 类中更改它
@Override
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
" NAME TEXT, EMAIL TEXT, ADDRESS TEXT)";
db.execSQL(createTable);
}
至
@Override
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
" NAME TEXT, EMAIL TEXT, ADDRESS TEXT , DATE DATETIME)";
db.execSQL(createTable);
}
要获得最佳代码重构变量名称,请单击shift+F6,然后重命名
public static final String COL1 = "ID";
public static final String COL2 = "NAME";
public static final String COL3 = "EMAIL";
public static final String COL4 = "ADDRESS";
public static final String COL5 = "DATE";
至
public static final String COL_ID = "ID";
public static final String COL_NAME = "NAME";
public static final String COL_EMAIL = "EMAIL";
public static final String COL_ADDRESS = "ADDRESS";
public static final String COL_DATE = "DATE";
并将创建语句更改为
@Override
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (" +
COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COL_NAME +" TEXT," +
COL_EMAIL +" TEXT,"+
COL_ADDRESS + " TEXT ,"+
COL_DATE + " DATETIME)";
db.execSQL(createTable);
}
关于java - 将日期(TextView)添加到 SQLite 数据库中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59204680/