我正在尝试使用SQLite数据库来存储我的应用程序的用户凭据数据
每当我尝试调试我的应用程序时，我总是在Debug LOGCAT中收到这些警告，因为我的应用程序停止运行并关闭
以下是我收到的警告
10-30 10:59:49.421 5435-5444/? W/SQLiteConnectionPool: A SQLiteConnection
object fordatabase'/data/user/0/com.google.android.gms/databases/metrics.db'
was leaked!
10-30 10:59:49.474 5435-5444/? W/SQLiteConnectionPool: A SQLiteConnection
object for database
'/data/user/0/com.google.android.gms/databases/help_responses.db.18'
这是我的DBHelper类
public class DbHelper extends SQLiteOpenHelper {
public DbHelper(Context context) {
super(context, "UserCredentials.db", null, 1);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
sqLiteDatabase.execSQL("create table UserInfo (User_Name text,Email text,Password text,Mobile text);");
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
sqLiteDatabase.execSQL("drop table if exists UserInfo");
onCreate(sqLiteDatabase);
}
}
这是我的loginform类（此类用于与应用程序一起演唱）
public class LogInForm extends AppCompatActivity {
private String UserName,EmailID,Password,PhoneNum;
private Date Birth;
private EditText userName,emailID,password,phoneNum,birth;
private Date date;
int Flag ;
DbHelper Db = new DbHelper(getApplicationContext());
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.registration_form);
Toolbar t2 = (Toolbar) findViewById(R.id.toolbarR) ;
setSupportActionBar(t2);
getSupportActionBar().setDisplayShowTitleEnabled(false);
userName = (EditText) findViewById(R.id.editTextUE);
emailID = (EditText) findViewById(R.id.editTextEE);
password = (EditText) findViewById(R.id.editTextPE);
phoneNum = (EditText) findViewById(R.id.editTextPHE);
birth = (EditText) findViewById(R.id.editTextDE);
Button Register = (Button) findViewById(R.id.Register);
Register.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
initialize();
SQLiteDatabase db = Db.getWritableDatabase();
ContentValues values = new ContentValues();
try{
if(validate())
{
values.put("User_Name", UserName);
values.put("Email", EmailID);
values.put("Password",Password);
values.put("Mobile",PhoneNum);
long row = db.insert("UserInfo", null, values);
Intent next = new Intent(getApplicationContext(),Success.class);
startActivity(next);
}
}
finally {
values.clear();
db.close();
}
}
});
}
public void initialize()
{
Flag=1;
UserName = userName.getText().toString().trim();
EmailID = emailID.getText().toString().trim();
PhoneNum = phoneNum.getText().toString().trim();
Birth = convertToDate(birth.getText().toString().trim());
Password = password.getText().toString().trim();
}
public boolean validate()
{
if(UserName.isEmpty())
{
Flag=0;
userName.setError(" Username cannot be blank");
}
SQLiteDatabase rdb = Db.getReadableDatabase();
Cursor c = rdb.query("UserInfo", null, null, null, null, null, null);
while(c.moveToNext()) {
String value = c.getString(c.getColumnIndex("User_Name"));
if ((value).equals(UserName))
{
Flag=0;
userName.setError(" Username Exists");
}
}
rdb.close();
c.close();
if(EmailID.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(EmailID).matches())
{
emailID.setError("Invalid EmailID");
Flag=0;
}
if(Password.length() < 9 )
{
password.setError("Password must be more than 9 characters");
Flag=0;
}
if(PhoneNum.isEmpty() || phoneNum.length()!=10)
{
phoneNum.setError("please enter valid phone Number");
Flag=0;
}
if(Flag==0)
{
return false;
}
else
{
return true;
}
}
这是我的主java类（如果用户有通过此类登录的帐户）
public class First extends AppCompatActivity {
DbHelper Db = new DbHelper(this);
EditText UserName = (EditText) findViewById(R.id.editText4);
EditText Password = (EditText) findViewById(R.id.editText5);
int Flag = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first);
Toolbar t = (Toolbar) findViewById(R.id.toolbarL) ;
setSupportActionBar(t);
getSupportActionBar().setDisplayShowTitleEnabled(false);
Button RegButton = (Button) findViewById(R.id.RegisterButton);
Button logButton = (Button) findViewById(R.id.LogButton);
RegButton.setOnClickListener(new OnClickListener(){
public void onClick(View view) {
Intent i2 = new Intent(getApplicationContext(), LogInForm.class);
startActivity(i2);
}
});
logButton.setOnClickListener(new OnClickListener(){
public void onClick(View view) {
SQLiteDatabase sq = Db.getReadableDatabase();
Cursor c = sq.query("UserInfo", null, null, null, null, null, null);
while(c.moveToNext())
{
if(c.getString(0).equals(UserName.getText().toString())&& c.getString(2).equals(Password.getText().toString()))
{
Flag = 1;
sq.close();
c.close();
Intent i3 = new Intent(getApplicationContext(), HomeScreen.class);
startActivity(i3);
}
}
if(Flag==0)
{
Toast toast = Toast.makeText(getApplicationContext(),"INVALID UserName/Password",Toast.LENGTH_SHORT);
toast.show();
sq.close();
c.close();
}
}
});
}
} 我该如何解决这个问题？