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sqlitedatabase类被导入未导入，如何导入它的主要活动MySQLiteopenhelper和数据库类不包括在主要活动
我在其中我使用的SQLite数据库的应用程序的工作。但是我在MySQLitedatabase和openhelper变量的变量声明中遇到了一个错误。
DatabaseHelper.java
package com.example.scs.scs;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper{
private static final int DATABASE_VERSION=1;
private static final String DATABASE_NAME="UserRegistration";
private String TABLE_REGDETAIL="UserRegistration";
private String KEY_ID="id";
private String KEY_FIRSTNAME="firstname";
private String KEY_LASTNAME="lastname";
private String KEY_EMAIL="email";
private String KEY_PASSWORD="password";
private String KEY_HINT="hint";
private String KEY_COUNTRY="country";
private String KEY_CONTACTNO="contactno";
public DatabaseHelper(Context context)
{
super(context,DATABASE_NAME,null,DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_REGDETAIL_TABLE="CREATE TABLE"+TABLE_REGDETAIL+"("
+KEY_ID+"INTEGER,"+KEY_FIRSTNAME+"TEXT,"+KEY_LASTNAME+"TEXT,"+KEY_EMAIL+"TEXT PRIMARY KEY,"+KEY_PASSWORD+"TEXT,"+KEY_HINT+"TEXT,"+KEY_COUNTRY+"TEXT,"
+KEY_CONTACTNO+"TEXT"+")";
db.execSQL(CREATE_REGDETAIL_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS"+TABLE_REGDETAIL);
onCreate(db);
}}
MainActivity.java
package com.example.scs.scs;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class Registration extends AppCompatActivity {
MySQliteOpenHelper mySqliteOpenHelper;
private MySQLiteDatabase database;
TextView fname, lname, remail, r_pass, contctnum, r_hint, r_country; //declaring variables for editview
Button btnreg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_registration);
DatabaseHelper db = new DatabaseHelper(this);
fname = (TextView) findViewById(R.id.edtfrstname);
lname = (TextView) findViewById(R.id.edtlastname);
remail = (TextView) findViewById(R.id.edtreg_email);
r_pass = (TextView) findViewById(R.id.edtreg_pass);
contctnum = (TextView) findViewById(R.id.edtcontactnum);
r_hint = (TextView) findViewById(R.id.edtpass_hint);
r_country = (TextView) findViewById(R.id.edtcountry);
btnreg = (Button) findViewById(R.id.btnregister);
Typeface myCustomFont = Typeface.createFromAsset(getAssets(), "fonts/Gabriola.ttf");
fname.setTypeface(myCustomFont);//font style of frst name edittext
lname.setTypeface(myCustomFont);//font style of last name edittext
remail.setTypeface(myCustomFont);//font style of reg email button
r_pass.setTypeface(myCustomFont);//font style of reg pass button
contctnum.setTypeface(myCustomFont);//font style of contact num
r_hint.setTypeface(myCustomFont);//font style of reg hint
r_country.setTypeface(myCustomFont);//font style of reg country
btnreg.setTypeface(myCustomFont);
btnreg = (Button) findViewById(R.id.btnregister);
btnreg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mySqliteOpenHelper = new MySQLiteOpenHelper(getApplicationContext());
}
});
}
}
MainActivity.java
package com.example.scs.scs;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class Registration extends AppCompatActivity {
MySQliteOpenHelper mySqliteOpenHelper;
private MySQLiteDatabase database;
TextView fname, lname, remail, r_pass, contctnum, r_hint, r_country; //declaring variables for editview
Button btnreg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_registration);
DatabaseHelper db = new DatabaseHelper(this);
fname = (TextView) findViewById(R.id.edtfrstname);
lname = (TextView) findViewById(R.id.edtlastname);
remail = (TextView) findViewById(R.id.edtreg_email);
r_pass = (TextView) findViewById(R.id.edtreg_pass);
contctnum = (TextView) findViewById(R.id.edtcontactnum);
r_hint = (TextView) findViewById(R.id.edtpass_hint);
r_country = (TextView) findViewById(R.id.edtcountry);
btnreg = (Button) findViewById(R.id.btnregister);
Typeface myCustomFont = Typeface.createFromAsset(getAssets(), "fonts/Gabriola.ttf");
fname.setTypeface(myCustomFont);//font style of frst name edittext
lname.setTypeface(myCustomFont);//font style of last name edittext
remail.setTypeface(myCustomFont);//font style of reg email button
r_pass.setTypeface(myCustomFont);//font style of reg pass button
contctnum.setTypeface(myCustomFont);//font style of contact num
r_hint.setTypeface(myCustomFont);//font style of reg hint
r_country.setTypeface(myCustomFont);//font style of reg country
btnreg.setTypeface(myCustomFont);
btnreg = (Button) findViewById(R.id.btnregister);
btnreg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mySqliteOpenHelper = new MySQLiteOpenHelper(getApplicationContext());
database = mySqliteOpenHelper.getReadable
}
});
}
}