最初我能够注册一个将其添加到数据库的用户，之后我能够使用登录表单验证注册用户，该表单检查了数据库中的用户电子邮件和密码，这项工作正确但是发生了一些事情和应用程序每次我点击“登录”按钮时都会崩溃。我知道有很多与此相关的问题，但我尝试过这些解决方案并没有成功。 谢谢您的帮助！
我的数据库处理代码：
public class DBHandler extends SQLiteOpenHelper {
public static final String DB__NAME = "ClubDB";
public static final int DB_VERSION=2;
public static final String TABLE_USER="User";
public static final String TABLE_CLUB="Club";
public static final String COL_ID="ID";
public static final String COL_ID2="ID";
public static final String COL_EMAIL="Email";
public static final String COL_PASSWORD="Password";
public static final String COL_CLUBNAME="ClubName";
public static final String COL_CLUBADDRESS="ClubAddress";
public static final String COL_X="X";
public static final String COL_Y="Y";
public static final String COL_TYPE="Type";
public static final String COL_NAME="Name";
public static final String COL_SURNAME="Surname";
public static final String COL_ADDRESS="Address";
public static final String COL_SPORT="SportType";
public static final String COL_MOBILE="Mobile";
public static final String COL_POSITION="Position";
public DBHandler (Context context){
super(context, DB__NAME, null, DB_VERSION);
}
public void onCreate(SQLiteDatabase db){
String sqlstatement = "CREATE TABLE " + TABLE_USER + "( " +
COL_ID + " integer primary key autoincrement, " +
COL_EMAIL + " text, " +
COL_PASSWORD + " text, " +
COL_NAME + " text, " +
COL_SURNAME + " text, " +
COL_ADDRESS + " text, " +
COL_SPORT + " text, " +
COL_MOBILE + " text, " +
COL_POSITION + " text ) ";
String clubstatement = "CREATE TABLE " + TABLE_CLUB + "( " +
COL_ID2 + " integer primary key autoincrement, " +
COL_CLUBNAME + " text, " +
COL_ADDRESS + " text, " +
COL_X + " double, " +
COL_Y + " double, " +
COL_TYPE + " text ) ";
db.execSQL(sqlstatement);
}
public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion)
{
db.execSQL("drop table if exists " + TABLE_USER);
db.execSQL("drop table if exists " + TABLE_CLUB);
onCreate(db);
}
public boolean addUser(String email, String password, String name, String surname,
String address, String sport, String mobile, String position)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_EMAIL, email);
contentValues.put(COL_PASSWORD, password);
contentValues.put(COL_NAME, name);
contentValues.put(COL_SURNAME, surname);
contentValues.put(COL_ADDRESS, address);
contentValues.put(COL_SPORT, sport);
contentValues.put(COL_MOBILE, mobile);
contentValues.put(COL_POSITION, position);
long result = db.insert(TABLE_USER,null ,contentValues);
if(result == -1)
return false;
else
return true;
}
public boolean addClub(String Clubname, String Clubaddress, double x, double y, String type)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_CLUBNAME, Clubname);
contentValues.put(COL_CLUBADDRESS, Clubaddress);
contentValues.put(COL_X, x);
contentValues.put(COL_Y, y);
contentValues.put(COL_TYPE, type);
long result = db.insert(TABLE_CLUB,null ,contentValues);
if(result == -1)
return false;
else
return true;
}
public void insert_User(String sqlInsert)
{
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL( sqlInsert );
db.close();
}
public void insert_Club(String sqlInsert)
{
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL( sqlInsert );
db.close();
}
public void update_User(String sqlUpdate){
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL( sqlUpdate );
db.close();
}
public void update_Club(String sqlUpdate){
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL( sqlUpdate );
db.close();
}
public ArrayList<User> selectAll_User( ){
String sqlQuery = "select * from " + TABLE_USER;
SQLiteDatabase db = this.getReadableDatabase( );
Cursor cursor = db.rawQuery( sqlQuery, null);
ArrayList<User> users = new ArrayList<User>( );
while ( cursor.moveToNext( ) ) {
User currentUser = new User(cursor.getInt( 0 ) ,
cursor.getString( 1 ) , cursor.getString( 2 ) , cursor.getString( 3 ) ,
cursor.getString( 4 ) , cursor.getString( 5 ) ,
cursor.getString( 6 ) , cursor.getString( 7 ) , cursor.getString( 8 ) , cursor.getString( 9 ) ,
cursor.getString( 10 ));
users.add ( currentUser );
}
cursor.close();
db.close( );
return users;
}
public Cursor getAllData() {
SQLiteDatabase db = this.getWritableDatabase();
Cursor res = db.rawQuery("select * from "+TABLE_USER, null);
return res;
}
public Cursor getAllClubData() {
SQLiteDatabase db = this.getWritableDatabase();
Cursor res = db.rawQuery("select * from "+TABLE_CLUB, null);
return res;
}
}
错误代码：
12-11 12:26:32.248 2773-2773/com.example.c14378041.clubca2 E/SQLiteLog: (1)
no such table: User
12-11 12:26:32.248 2773-2773/com.example.c14378041.clubca2 D/AndroidRuntime:
Shutting down VM
12-11 12:26:32.250 2773-2773/com.example.c14378041.clubca2 E/AndroidRuntime:
FATAL EXCEPTION: main
Process: com.example.c14378041.clubca2, PID: 2773
java.lang.IllegalStateException: Could not execute method for
android:onClick
at
android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick
(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: android.database.sqlite.SQLiteException: no such table: User
(code 1): , while compiling: select * from User
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native
Method)
at
android.database.sqlite.SQLiteConnection.acquirePreparedStatement
(SQLiteConnecti
on.java:889)
at
android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at
android.database.sqlite.SQLiteDirectCursorDriver.query
(SQLiteDirectCursorDriver
.java:44)
at
android.database.sqlite.SQLiteDatabase.rawQueryWithFactory
(SQLiteDatabase.java:1318)
at
android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1257)
at com.example.c14378041.clubca2.DBHandler.getAllData(DBHandler.java:188)
at com.example.c14378041.clubca2.MainActivity.Ulogin(MainActivity.java:45)
at java.lang.reflect.Method.invoke(Native Method)
at
android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick
(Ap
pCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22429)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
我调用数据库代码的Java方法：
public class MainActivity extends AppCompatActivity {
Button registerButton;
DBHandler dbhandler;
EditText email;
EditText password;
public static final String EXTRA_MESSAGE = "com.example.c14378041.clubca2";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button registerButton= (Button)findViewById(R.id.registerbutton);
email = (EditText) findViewById(R.id.emaillogin);
password = (EditText) findViewById(R.id.passwordlogin);
dbhandler = new DBHandler(this);
}
public void adminLogin(View view)
{
Intent intent = new Intent(this, Admin_Activity.class);
startActivity(intent);
}
public void Ulogin(View view)
{
Cursor cursor = dbhandler.getAllData();
Boolean found = false;
while (cursor.moveToNext()){
if ( (cursor.getString(1).equals(email.getText().toString()) ) && (cursor.getString(2).equals(password.getText().toString())) )
{
Intent intent = new Intent(this, Welcome_Activity.class);
String message = email.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
found = true;
Toast.makeText(MainActivity.this,"User Logged in!",Toast.LENGTH_SHORT).show();
}
}
if ((cursor.isAfterLast()) && !found)
{
Toast.makeText(MainActivity.this,"Username or Password incorrect",Toast.LENGTH_SHORT).show();
cursor.close();
}
}
我的activity_main xml文件：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.c14378041.clubca2.MainActivity">
<EditText
android:id="@+id/passwordlogin"
android:layout_width="256dp"
android:layout_height="37dp"
android:ems="10"
android:hint="password"
android:inputType="textPassword"
android:textSize="15dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="222dp"
android:layout_marginRight="64dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.0" />
<TextView
android:id="@+id/Login"
android:layout_width="224dp"
android:layout_height="31dp"
android:text="Already a User? Login:"
android:textSize="20dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="120dp"
android:layout_marginLeft="30dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.409"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.031" />
<TextView
android:id="@+id/newUserView"
android:layout_width="224dp"
android:layout_height="31dp"
android:text="New User? Register:"
android:textSize="20dp"
android:layout_marginLeft="16dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="262dp"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.588"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.371" />
<TextView
android:layout_width="337dp"
android:layout_height="50dp"
android:text="Find YOUR club"
android:textSize="40dp"
android:textStyle="italic"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginBottom="361dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintVertical_bias="0.0"
app:layout_constraintHorizontal_bias="1.0"
android:id="@+id/textView3" />
<Button
android:id="@+id/loginbutton"
android:layout_width="100dp"
android:layout_height="36dp"
android:text="Login"
android:layout_marginTop="25dp"
app:layout_constraintTop_toBottomOf="@+id/Login"
android:layout_marginLeft="142dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.28"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.0"
android:onClick="Ulogin"/>
<EditText
android:id="@+id/emaillogin"
android:layout_width="256dp"
android:layout_height="37dp"
android:ems="10"
android:inputType="textPersonName"
android:hint="Email@gmail.com"
android:textSize="15dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="169dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.006"
android:layout_marginLeft="30dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.377" />
<Button
android:id="@+id/registerbutton"
android:layout_width="143dp"
android:layout_height="36dp"
android:text="Register"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="364dp"
android:layout_marginLeft="121dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.184"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.0"
android:onClick="registerUser"/>
<ImageView
android:id="@+id/imageView"
android:layout_width="70dp"
android:layout_height="59dp"
app:srcCompat="@mipmap/clubicon"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="45dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.045" />
<ImageButton
android:id="@+id/imageButton4"
android:layout_width="39dp"
android:layout_height="36dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:srcCompat="@mipmap/ic_launcher_round"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintVertical_bias="1.0"
android:onClick="adminLogin"/>
</android.support.constraint.ConstraintLayout>
答案 0 :(得分：0)
在onCreate（）DHelper中添加db.execSQL(sqlstatement);，如下所示
public void onCreate(SQLiteDatabase db){
String sqlstatement = "CREATE TABLE " + TABLE_USER + "( " +
COL_ID + " integer primary key autoincrement, " +
COL_EMAIL + " text, " +
COL_PASSWORD + " text, " +
COL_NAME + " text, " +
COL_SURNAME + " text, " +
COL_ADDRESS + " text, " +
COL_SPORT + " text, " +
COL_MOBILE + " text, " +
COL_POSITION + " text ) ";
db.execSQL(sqlstatement);
}
还更新DB version