Question

我有这段代码，用于验证用户输入密码（密码已由密码定义）。现在，如果密码正确，那么他将进入下一个在数据库中添加内容的过程。除了这个错误，进程已经没问题。提前致谢。希望你帮我这个:(

package info.androidhive.slidingmenu;

import info.androidhive.slidingmenu.MainActivity;
import info.androidhive.slidingmenu.ObjectStudent;
import info.androidhive.slidingmenu.DatabaseFragment;
import info.androidhive.slidingmenu.R;
import info.androidhive.slidingmenu.TableControllerStudent;
import android.R.string;
import android.app.Fragment;
import android.os.Bundle;
import android.text.Editable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class DatabaseFragment extends Fragment 
{
    public DatabaseFragment(){}

    Context thiscontext;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        thiscontext = container.getContext();
        RelativeLayout mRelativeLayout = (RelativeLayout) inflater.inflate(R.layout.fragment_database,
            container, false);
        Button buttonCreateLocation = (Button) mRelativeLayout.findViewById(R.id.buttonCreateStudent);
        buttonCreateLocation.setOnClickListener(new OnClickListener()
        {
            public void onClick(View views) 
            {
                final Context context = views.getContext();
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                View formElementsView = inflater.inflate(R.layout.login_input_form, null, false);

                final EditText usernamea = (EditText) formElementsView.findViewById(R.id.username);
                final EditText passworda = (EditText) formElementsView.findViewById(R.id.password);

                new AlertDialog.Builder(context)
                    .setView(formElementsView)
                    .setTitle("Login")
                    .setPositiveButton("Submit",
                        new DialogInterface.OnClickListener() 
                        {
                            public void onClick(DialogInterface dialog, int id) 
                                {
                                    Editable password = null;
                                    if (passworda.getText()== password)
                                    {
                                        @Override
                                        public void onClick(View view) //THE ERROR IS LOCATED HERE
                                        {
                                            final Context context = view.getContext();

                                            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                                            View formElementsView = inflater.inflate(R.layout.student_input_form, null, false);

                                            final EditText editTextStudentFirstname = (EditText) formElementsView.findViewById(R.id.editTextStudentFirstname);
                                            final EditText editTextStudentEmail = (EditText) formElementsView.findViewById(R.id.editTextStudentEmail);
                                            final EditText editTextStudentCategory = (EditText) formElementsView.findViewById(R.id.editTextStudentCategory);

                                            new AlertDialog.Builder(context)
                                                .setView(formElementsView)
                                                .setTitle("Create Translation")
                                                .setPositiveButton("Add",
                                                    new DialogInterface.OnClickListener() 
                                                    {
                                                        public void onClick(DialogInterface dialog, int id) 
                                                        {
                                                            String studentFirstname = editTextStudentFirstname.getText().toString();
                                                            String studentEmail = editTextStudentEmail.getText().toString();
                                                            String studentCategory = editTextStudentCategory.getText().toString();

                                                            ObjectStudent objectStudent = new ObjectStudent();
                                                            objectStudent.firstname = studentFirstname;
                                                            objectStudent.email = studentEmail;
                                                            objectStudent.category = studentCategory;

                                                            boolean createSuccessful = new TableControllerStudent(context).create(objectStudent);
                                                            if(createSuccessful)
                                                            {
                                                                Toast.makeText(context, "Student information was saved.", Toast.LENGTH_SHORT).show();
                                                            }
                                                            else
                                                            {
                                                                Toast.makeText(context, "Unable to save student information.", Toast.LENGTH_SHORT).show();
                                                            }

                                                            ((MainActivity) context).countRecords();
                                                            ((MainActivity) context).readRecords();

                                                            dialog.cancel();
                                                        }
                                                    }).show();
                                        }
                                    }
                                    else
                                    {
                                        dialog.cancel();
                                    }
                                }    
                        });
                return mRelativeLayout;
            }
        });
    }
}

这是数据库

 public class DatabaseHandler extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 1;
protected static final String DATABASE_NAME = "StudentDatabase";

public DatabaseHandler(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {

    String sql = "CREATE TABLE students " +
            "( id INTEGER PRIMARY KEY AUTOINCREMENT, " +
            "firstname TEXT, " +
            "username TEXT, " +
            "password TEXT, " +
            "email TEXT, " 
            + "category TEXT ) ";

    db.execSQL(sql);

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    String sql = "DROP TABLE IF EXISTS students";
    db.execSQL(sql);

    onCreate(db);
}

 }

Answer 1

multiple markers at this line

这个异常是由SQLite异常抛出的，你应该发布你的数据库填充代码，以及Logcat输出;）

顺便欢迎！

编辑：您应该总是使用如下字符串类型来处理if-clauses：.equals("")而不是：==

这条线上有多个标记。 - 令牌上的语法错误

1 个答案: