我正在尝试使用特定成员的FATAL EXCEPTION: main
Process: no.nordicsemi.android.nrftoolbox, PID: 13196
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:4785)
at android.view.View$PerformClick.run(View.java:19888)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5276)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:911)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:706)
Caused by: java.lang.reflect.InvocationTargetException
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick
Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
at android.database.AbstractCursor.checkPosition(AbstractCursor.java:432)
at android.database.AbstractWindowedCursor.checkPosition
at android.database.AbstractWindowedCursor.getInt
at no.nordicsemi.android.nrftoolbox.LoginActivity.login
使用数据库登录。
但该应用程序崩溃与日志错误。
在其他各种类似的错误后，我加入了“c1.movetoFirst（）;”和“c2.movetoFirst（）;”。但它还是不起作用。
logcat错误是：
public class LoginActivity extends AppCompatActivity {
TextView email;
TextView pass;
private no.nordicsemi.android.nrftoolbox.myDbAdapter mydb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
email = (TextView) findViewById(R.id.editText_mail);
pass = (TextView) findViewById(R.id.editText_pass);
mydb = new no.nordicsemi.android.nrftoolbox.myDbAdapter(this);
}
public void register(View v) {
Intent goToSecond = new Intent();
goToSecond.setClass(this, Register_Page.class);
startActivity(goToSecond);
}
public void login(View v) {
Cursor c1 = mydb.getEmail(email);
c1.moveToFirst();
Cursor c2 = mydb.getpass(pass);
c2.moveToFirst();
int id1=c1.getInt(0);
int id2=c2.getInt(0);
if (id1>0 & id2>0) {
Intent goToSecond = new Intent();
goToSecond.setClass(this, Profile.class);
startActivity(goToSecond);
} else
message(getApplicationContext(), "not valid user");
}
}
LoginActivity是：
public class myDbAdapter extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 4;
public static final String DATABASE_NAME = "MyDBName.db";
public static final String CONTACTS_TABLE_NAME = "contacts";
public static final String CONTACTS_COLUMN_ID = "id";
public static final String CONTACTS_COLUMN_NAME = "name";
public static final String CONTACTS_COLUMN_EMAIL = "email";
public static final String CONTACTS_COLUMN_PASS = "password";
public static final String CONTACTS_COLUMN_DOB = "dateofbirth";
public static final String CONTACTS_COLUMN_GENDER = "gender";
public static final String CONTACTS_COLUMN_PHONE="phone";
public static final String CONTACTS_COLUMN_CITY="city";
public static final String CONTACTS_COLUMN_WALLET="wallet";
private HashMap hp;
public myDbAdapter(Context context) {
super(context, DATABASE_NAME , null, 4);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(
"CREATE TABLE " + CONTACTS_TABLE_NAME + "(" + CONTACTS_COLUMN_ID + " INTEGER PRIMARY KEY," + CONTACTS_COLUMN_NAME + " TEXT," + CONTACTS_COLUMN_EMAIL + " TEXT," + CONTACTS_COLUMN_PASS +" TEXT," + CONTACTS_COLUMN_DOB + " TEXT," + CONTACTS_COLUMN_GENDER + " TEXT," + CONTACTS_COLUMN_PHONE + " INTEGER," + CONTACTS_COLUMN_CITY + " TEXT,"+CONTACTS_COLUMN_WALLET + " INTEGER DEFAULT 0);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
public boolean insertContact (String name, String email, String pass, String dob, String gender, String phone, String city) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
contentValues.put("email", email);
contentValues.put("password", pass);
contentValues.put("dateofbirth", dob);
contentValues.put("gender", gender);
contentValues.put("phone", phone);
contentValues.put("city", city);
db.insert("contacts", null, contentValues);
return true;
}
//Cursor csr = no.nordicsemi.android.nrftoolbox.CommonSQLiteUtilities.getAllRowsFromTable(db,"contacts",true,null)
//no.nordicsemi.android.nrftoolbox.CommonSQLiteUtilities.LogCursorData(csr);
public int updateWallet(String amount,Integer id)
{
SQLiteDatabase db=this.getWritableDatabase();
ContentValues contentValues=new ContentValues();
contentValues.put("wallet",amount);
return(db.update("contacts",contentValues,"id = ? ",new String[] { Integer.toString(id)}));
}
public Cursor getData(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from contacts where id="+id+"", null );
return res;
}
public Cursor getEmail(TextView email)
{
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor= db.rawQuery( "select id from contacts where email='"+email.getText().toString()+"'",null);
return cursor;
}
public Cursor getpass(TextView pass)
{
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor= db.rawQuery( "select id from contacts where password='"+pass.getText().toString()+"'",null);
return cursor;
}
}
myDbHelper是：
cin >> i错误在哪里？怎么能被重新认识呢？
答案 0 :(得分：1)
在
中调用cursor之前，最好先检查movetoFirst是否有下一个 Cursor c1 = mydb.getEmail(email);
if(c1.getcount() > 0)
c1.moveToFirst();
dict= {('P06', 'P09'): 36340, ('P01', 'P05', 'P06', 'P09'): 10085, ('P01', 'P06'): 36337, ('P01', 'P09'): 49897, ('P02', 'P09'): 11573}
df = pd.DataFrame.from_dict(dict, orient='index')
df.rename_axis('Product Id').reset_index()\
.assign(length = df.index.str.len()).rename(columns={0:'Count'})
并确保，电子邮件ID已在数据库中并检查区分大小写。