我正在创建一个Android应用程序，其中包含使用sqlite数据库的注册表单和忘记密码字段后，单击忘记密码字段安全检查以显示密码与重置按钮。当我单击重置密码字段时，显示绑定索引1处的值为空请帮我修复此问题。这是我点击忘记归档后的活动代码：
forgot_reset = (ButtonFlat)forgot_dialog.findViewById(R.id.dialog_button_Reset_forgot);
forgot_reset.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
String stored_sec_hint = loginDataBaseAdapter.getSinlgeEntry(dialog_seq_answer);
if(confirm_sec_hint_forgot.equals(""))
{
Toast.makeText(Login_Page.this, "Please enter your security hint to proceed", Toast.LENGTH_LONG).show();
}
else
{
if(stored_sec_hint==null)
{
Toast.makeText(Login_Page.this, "Please Enter correct security hint to proceed", Toast.LENGTH_LONG).show();
}
else
{
show_pwd.setText(stored_pass);
}
}
}
});
forgot_dialog.show();
}
});
这是我的数据库适配器类：
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
public class LoginDataBaseAdapter
{
static final String DATABASE_NAME = "login.db";
static final int DATABASE_VERSION = 1;
public static final int NAME_COLUMN = 1;
// TODO: Create public field for each column in your table.
// SQL Statement to create a new database.
static final String DATABASE_CREATE = "create table "+"LOGIN"+
"( " +"ID"+" integer primary key autoincrement,"+"USERNAME text UNIQUE,PASSWORD text,SECHINT text); ";
// Variable to hold the database instance
public SQLiteDatabase db;
// Context of the application using the database.
private final Context context;
// Database open/upgrade helper
private DataBaseHelper dbHelper;
public LoginDataBaseAdapter(Context _context)
{
context = _context;
dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public LoginDataBaseAdapter open() throws SQLException
{
db = dbHelper.getWritableDatabase();
return this;
}
public void close()
{
db.close();
}
public SQLiteDatabase getDatabaseInstance()
{
return db;
}
public void insertEntry(String dialog_user_name_string,String dialog_pasword_string,String dialog_seq_answer)
{
ContentValues newValues = new ContentValues();
newValues.put("USERNAME", dialog_user_name_string);
newValues.put("PASSWORD",dialog_pasword_string);
newValues.put("SECHINT", dialog_seq_answer);
// Insert the row into your table
db.insert("LOGIN", null, newValues);
///Toast.makeText(context, "Reminder Is Successfully Saved", Toast.LENGTH_LONG).show();
}
public int deleteEntry(String dialog_pasword_string)
{
//String id=String.valueOf(ID);
String where="USERNAME=?";
int numberOFEntriesDeleted= db.delete("LOGIN", where, new String[]{dialog_pasword_string}) ;
// Toast.makeText(context, "Number fo Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
return numberOFEntriesDeleted;
}
public String getSinlgeEntry(String userName)
{
Cursor cursor=db.query("LOGIN", null, " USERNAME=?", new String[]{userName}, null, null, null);
if(cursor.getCount()<1) // UserName Not Exist
{
cursor.close();
return "NOT EXIST";
}
cursor.moveToFirst();
String password= cursor.getString(cursor.getColumnIndex("PASSWORD"));
cursor.close();
return password;
}
public void updateEntry(String forgot_new_password_string)
{
// Define the updated row content.
ContentValues updatedValues = new ContentValues();
// Assign values for each row.
//updatedValues.put("USERNAME", dialog_user_name_string);
updatedValues.put("PASSWORD",forgot_new_password_string);
String where="PASSWORD = ?";
db.update("LOGIN",updatedValues, where, new String[]{forgot_new_password_string});
}
}
这是我的logcat：
02-17 18:24:02.590: E/AndroidRuntime(29035): FATAL EXCEPTION: main
02-17 18:24:02.590: E/AndroidRuntime(29035): Process: com.medequip.c1testpanel, PID: 29035
02-17 18:24:02.590: E/AndroidRuntime(29035): java.lang.IllegalArgumentException: the bind value at index 1 is null
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.database.sqlite.SQLiteProgram.bindString(SQLiteProgram.java:164)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.database.sqlite.SQLiteProgram.bindAllArgsAsStrings(SQLiteProgram.java:200)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1339)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1186)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1057)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1225)
02-17 18:24:02.590: E/AndroidRuntime(29035): at com.medequip.c1testpanel.LoginDataBaseAdapter.getSinlgeEntry(LoginDataBaseAdapter.java:65)
02-17 18:24:02.590: E/AndroidRuntime(29035): at com.medequip.c1testpanel.Login_Page$2$1.onClick(Login_Page.java:144)
02-17 18:24:02.590: E/AndroidRuntime(29035): at com.gc.materialdesign.views.ButtonFlat.onDraw(ButtonFlat.java:83)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.draw(View.java:14728)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13588)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13635)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3226)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13509)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13635)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3226)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13509)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13635)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3226)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13509)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13635)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3226)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13509)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13635)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3226)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13509)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.View.getDisplayList(View.java:13635)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.HardwareRenderer$GlRenderer.buildDisplayList(HardwareRenderer.java:1627)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1506)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewRootImpl.draw(ViewRootImpl.java:2722)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2587)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2210)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.Choreographer.doCallbacks(Choreographer.java:591)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.Choreographer.doFrame(Choreographer.java:560)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.os.Handler.handleCallback(Handler.java:808)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.os.Handler.dispatchMessage(Handler.java:103)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.os.Looper.loop(Looper.java:193)
02-17 18:24:02.590: E/AndroidRuntime(29035): at android.app.ActivityThread.main(ActivityThread.java:5292)
02-17 18:24:02.590: E/AndroidRuntime(29035): at java.lang.reflect.Method.invokeNative(Native Method)
02-17 18:24:02.590: E/AndroidRuntime(29035): at java.lang.reflect.Method.invoke(Method.java:515)
02-17 18:24:02.590: E/AndroidRuntime(29035): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
02-17 18:24:02.590: E/AndroidRuntime(29035): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
02-17 18:24:02.590: E/AndroidRuntime(29035): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：6)
简单地说，你在selectionArgs中传递的值是null。确保传递的值不为null。请在执行此查询之前检查用户名变量的值
if(userName!=null){
Cursor cursor=db.query("LOGIN", null, " USERNAME=?", new String[]{userName}, null, null, null);
}
在getSinlgeEntry（String userName）方法中。希望它有帮助。
答案 1 :(得分：0)
你在没有领先空间的情况下尝试过吗？
public String getSinlgeEntry(String userName)
{
Cursor cursor=db.query("LOGIN", null, "USERNAME=?", new String[]{userName}, null, null, null);
if(cursor.moveToFirst())
{
return cursor.getString(cursor.getColumnIndex("PASSWORD"));
}
cursor.close();
return "NOT EXIST";
}