Android登錄驗證

我已經嘗試了一切，所以在這個階段與我的Android登錄沮喪，有人可以幫助請！我有一個登錄屏幕，要求用戶輸入電子郵件和密碼，當他們點擊登錄時，需要去檢查我的sqlite數據庫，如果正確，他們將成功登錄，如果不正確，他們將被要求再次嘗試！我已張貼下面Android登錄驗證

登錄活動我的代碼

package com.example.finalproject; 



import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

public class LoginActivity extends Activity{ 

    EditText EmailAdd; 
    EditText Password; 
    Button Login; 
    Button NewUser; 
    private SQLiteAdapter db; 


    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.login_activity); 
     //addListenerOnButton(); 

     //Button mNewUser = (Button)findViewById(R.id.btnLogMain); 
     //mNewUser.setOnClickListener(this); 

     EmailAdd = (EditText)findViewById(R.id.password); 
     Password = (EditText)findViewById(R.id.password); 

     Login = (Button)findViewById(R.id.btnLogMain); 
     Login.setOnClickListener(buttonLoginOnClickListener); 
     NewUser = (Button)findViewById(R.id.btnNewUser); 
     NewUser.setOnClickListener(buttonNewUserOnClickListener); 

    } 



    Button.OnClickListener buttonLoginOnClickListener 
     = new Button.OnClickListener(){ 

     @Override 
      public void onClick(View arg0) { 
      //SQLiteAdapter db = new SQLiteAdapter (LoginActivity.this); 
      SQLiteDatabase db = new SQLiteAdapter(LoginActivity.this).openToWrite(); 
      String email = EmailAdd.getText().toString(); 
      String password = Password.getText().toString(); 

      Cursor c = db.rawQuery("SELECT email FROM MY_USERS_TABLE WHERE email= ? AND password=?", new String[] {email, password}); 
      if(c.moveToFirst()) { 
       Toast.makeText(getApplicationContext(), "Success", Toast.LENGTH_SHORT).show(); 
       Intent main = new Intent(LoginActivity.this, MainMenuActivity.class); 
       startActivity(main); 
      } else { 
       Toast.makeText(getApplicationContext(), "Failed..\nTry Again", Toast.LENGTH_SHORT).show(); 
      } 
      Intent register = new Intent(LoginActivity.this, RegisterActivity.class); 
      startActivity(register); 
    } 
    }; 
    /*@Override 
    public void onClick(View arg0) { 
     Toast.makeText(getApplicationContext(), "Working to here!", Toast.LENGTH_SHORT).show(); 
     String data1 = EmailAdd.getText().toString(); 
     String data2 = Password.getText().toString(); 

     boolean invalid = false; 
     //uname == null || uname.length() == 0 
     if(data1.equals("")){ 
      invalid = true; 
      Toast.makeText(getApplicationContext(), "Email ID Missing", Toast.LENGTH_SHORT).show(); 
     }else if(data2.equals("")){ 
      invalid = true; 
      Toast.makeText(getApplicationContext(), "Email ID Missing", Toast.LENGTH_SHORT).show(); 
     } 

     if(invalid == false){ 
      //need to check here for valid email and password 

      Intent i_register = new Intent(LoginActivity.this, MainMenuActivity.class); 
      startActivity(i_register); 
      EmailAdd.setText(""); 
      Password.setText(""); 
      finish(); 
     } 
     /*switch(v.getId()){ 

     case R.id.btnLogMain: 
      mEmailAdd = (EditText)findViewById(R.id.email); 
      mPassword = (EditText)findViewById(R.id.password); 

      String uname = mEmailAdd.getText().toString(); 
      String pass = mPassword.getText().toString(); 

      if(uname.equals("") || uname == null){ 
       Toast.makeText(getApplicationContext(), "email Empty", Toast.LENGTH_SHORT).show(); 
      }else if(pass.equals("") || pass == null){ 
       Toast.makeText(getApplicationContext(), "Password Empty", Toast.LENGTH_SHORT).show(); 
      }else{ 
       boolean validLogin = validateLogin(uname, pass, LoginActivity.this); 
       if(validLogin){ 
        System.out.println("In Valid"); 
        Intent i = new Intent(LoginActivity.this, MainMenuActivity.class); 
        startActivity(i); 
        finish(); 
       } 
      } 
      break; 


     }*/ 
    // } 
    //}; 

*RegisterActivity class* 
import android.app.Activity; 
import android.content.Intent; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.view.View; 
//import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ListView; 
import android.widget.SimpleCursorAdapter; 
import android.widget.TextView; 
import android.widget.Toast; 

public class RegisterActivity extends Activity { 

EditText inputName, inputEmail, inputPassword; 
Button buttonRegister, buttonDeleteAll; 
TextView login; 
private SQLiteAdapter mySQLiteAdapter; 
ListView listContent; 

SimpleCursorAdapter cursorAdapter; 
Cursor cursor; 


    /** Called when the activity is first created. */ 

@Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.register_activity); 


     inputName = (EditText)findViewById(R.id.name); 
     inputEmail = (EditText)findViewById(R.id.email); 
     inputPassword = (EditText)findViewById(R.id.password); 
     buttonRegister = (Button)findViewById(R.id.register); 
     //buttonDeleteAll = (Button)findViewById(R.id.showAll); 

     listContent = (ListView)findViewById(R.id.contentlist); 

     mySQLiteAdapter = new SQLiteAdapter(this); 
     mySQLiteAdapter.openToWrite(); 

     cursor = mySQLiteAdapter.queueAll(); 
     // String[] from = new String[]{SQLiteAdapter.KEY_ID, SQLiteAdapter.KEY_NAME, SQLiteAdapter.KEY_EMAIL,SQLiteAdapter.KEY_PASSWORD}; 
     /*int[] to = new int[]{R.id.id, R.id.text1, R.id.text2,R.id.text3}; 
     cursorAdapter = 
     new SimpleCursorAdapter(this, R.layout.row, cursor, from, to); 
     listContent.setAdapter(cursorAdapter);*/ 

     buttonRegister.setOnClickListener(buttonAddOnClickListener); 
     //buttonShowAll.setOnClickListener(buttonShowAllOnClickListener); 
     //addListenerOnRegButton(); 

     TextView loginScreen = (TextView) findViewById(R.id.login); 

     // Listening to login 
     loginScreen.setOnClickListener(TextLoginOnClickListener); 
} 

TextView.OnClickListener TextLoginOnClickListener 
= new TextView.OnClickListener(){ 



@Override 
public void onClick(View arg0) { 
    Intent i = new Intent(getApplicationContext(), LoginActivity.class); 
    startActivity(i); 

} 
}; 

    Button.OnClickListener buttonAddOnClickListener 
    = new Button.OnClickListener(){ 



    @Override 
    public void onClick(View arg0) { 



    String data1 = inputName.getText().toString(); 
    String data2 = inputEmail.getText().toString(); 
    String data3 = inputPassword.getText().toString(); 

    boolean invalid = false; 

    if(data1.equals("")){ 
     invalid = true; 
     Toast.makeText(getApplicationContext(), "Name Missing", Toast.LENGTH_SHORT).show(); 
    }else if(data2.equals("")){ 
     invalid = true; 
     Toast.makeText(getApplicationContext(), "Email ID Missing", Toast.LENGTH_SHORT).show(); 
    }else if(data3.equals("")){ 
     invalid = true; 
     Toast.makeText(getApplicationContext(), "Password Missing", Toast.LENGTH_SHORT).show(); 
    } 

    if(invalid == false){ 
     mySQLiteAdapter.insert(data1, data2, data3); 
     updateList(); 
      Toast.makeText(RegisterActivity.this, "You are now registered", 
        Toast.LENGTH_SHORT).show(); 

     Intent i_register = new Intent(RegisterActivity.this, LoginActivity.class); 
     startActivity(i_register); 

     inputName.setText(""); 
     inputEmail.setText(""); 
     inputPassword.setText(""); 
     finish(); 
    } 




    } 

    }; 




    /*Button.OnClickListener buttonShowAllOnClickListener1 
    = new Button.OnClickListener(){ 

    @Override 
    public void onClick(View arg0) { 
     Intent i = new Intent(RegisterActivity.this, MainMenuActivity.class); 
     startActivity(i); 
     finish(); 
    } 

    }; 

@Override 
protected void onDestroy() { 
    // TODO Auto-generated method stub 
    super.onDestroy(); 
    mySQLiteAdapter.close(); 
}*/ 



private void updateList(){ 
    //cursor.requery(); 
    } 

} 
    /* public boolean validateLogin(String uemail, String pass, Context context) { 

     mydb = new SQLiteAdapter(this); 
     SQLiteDatabase db = mydb.openToWrite(); 
     //SELECT 
     String[] columns = {"_id"}; 

     //WHERE clause 
     String selection = "email=? AND password=?"; 

     //WHERE clause arguments 
     String[] selectionArgs = {uemail,pass}; 

     Cursor cursor = null; 
     try{ 
     //SELECT _id FROM login WHERE email=uemail AND password=pass 
     cursor = db.query(SQLiteAdapter.MYDATABASE_TABLE, columns, selection, selectionArgs, null, null, null,null); 

     // startManagingCursor(cursor); 

     }catch(Exception e){ 
      e.printStackTrace(); 
     } 
     int numberOfRows = cursor.getCount(); 

     if(numberOfRows <= 0){ 

      Toast.makeText(getApplicationContext(), "Failed..\nTry Again", Toast.LENGTH_SHORT).show(); 
      return false; 
     } 


     return true; 
    }*/ 



    Button.OnClickListener buttonNewUserOnClickListener 
     = new Button.OnClickListener(){ 
     @Override 
      public void onClick(View arg0) { 

    } 
    }; 



    }

* SQLiteAdapter *

package com.example.finalproject; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.database.sqlite.SQLiteDatabase.CursorFactory; 

public class SQLiteAdapter { 

public static final String MYDATABASE_NAME = "MY_PROJECT_DATABASE"; 
public static final String MYDATABASE_TABLE = "MY_USERS_TABLE"; 
public static final int MYDATABASE_VERSION = 1; 
public static final String KEY_ID = "_id"; 
public static final String KEY_NAME = "name"; 
public static final String KEY_EMAIL = "email"; 
public static final String KEY_PASSWORD = "password"; 

//create table MY_DATABASE (ID integer primary key, Content text not null); 
private static final String SCRIPT_CREATE_DATABASE = 
    "create table " + MYDATABASE_TABLE + " (" 
    + KEY_ID + " integer primary key autoincrement, " 
    + KEY_NAME + " text not null, " 
    + KEY_EMAIL + " text not null, " 
    + KEY_PASSWORD + " text not null);"; 

private SQLiteHelper sqLiteHelper; 
private SQLiteDatabase sqLiteDatabase; 

private Context context; 

public SQLiteAdapter(Context c){ 
    context = c; 
} 

public SQLiteAdapter openToRead() throws android.database.SQLException { 
    sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION); 
    sqLiteDatabase = sqLiteHelper.getReadableDatabase(); 
    return this; 
} 

public SQLiteDatabase openToWrite() throws android.database.SQLException { 
     sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, 
       MYDATABASE_VERSION); 
     sqLiteDatabase = sqLiteHelper.getWritableDatabase(); 
     return sqLiteDatabase; 
    } 
/*public SQLiteAdapter openToWrite() throws android.database.SQLException { 
    sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION); 
    sqLiteDatabase = sqLiteHelper.getWritableDatabase(); 
    return this; 
}*/ 

public void close(){ 
    sqLiteHelper.close(); 
} 

public long insert(String name, String email, String password){ 

    ContentValues contentValues = new ContentValues(); 
    contentValues.put(KEY_NAME, name); 
    contentValues.put(KEY_EMAIL, email); 
    contentValues.put(KEY_PASSWORD, password); 
    return sqLiteDatabase.insert(MYDATABASE_TABLE, null, contentValues); 
} 

public int deleteAll(){ 
    return sqLiteDatabase.delete(MYDATABASE_TABLE, null, null); 
} 

public Cursor queueAll(){ 
    String[] columns = new String[]{KEY_ID, KEY_NAME, KEY_EMAIL,KEY_PASSWORD}; 
    Cursor cursor = sqLiteDatabase.query(MYDATABASE_TABLE, columns, 
    null, null, null, null, null); 

    return cursor; 
} 

public class SQLiteHelper extends SQLiteOpenHelper { 

    public SQLiteHelper(Context context, String name, 
    CursorFactory factory, int version) { 
    super(context, name, factory, version); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
    // TODO Auto-generated method stub 
    db.execSQL(SCRIPT_CREATE_DATABASE); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    // TODO Auto-generated method stub 
    } 
} 
}

我已經嘗試了很多東西，但我擊球的時候登錄按鈕會出現一條消息「很遺憾停止工作「預先感謝您的任何幫助，將不勝感激

logcat的

The application may be doing too much work on its main thread. 
    02-04 00:49:58.305: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.305: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.415: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.415: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.874: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.884: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.894: I/Choreographer(7726): Skipped 73 frames! The application may be doing too much work on its main thread. 
    02-04 00:49:58.894: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.894: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.945: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.975: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:58.975: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:59.024: W/Trace(7726): Unexpected value from nativeGetEnabledTags: 0 
    02-04 00:49:59.104: D/AndroidRuntime(7726): Shutting down VM 
    02-04 00:49:59.104: W/dalvikvm(7726): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 
    02-04 00:49:59.154: E/AndroidRuntime(7726): FATAL EXCEPTION: main 
    02-04 00:49:59.154: E/AndroidRuntime(7726): java.lang.NullPointerException 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at com.example.finalproject.LoginActivity$2.onClick(LoginActivity.java:165) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at android.view.View.performClick(View.java:4202) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at android.view.View$PerformClick.run(View.java:17340) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at android.os.Handler.handleCallback(Handler.java:725) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at android.os.Handler.dispatchMessage(Handler.java:92) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at android.os.Looper.loop(Looper.java:137) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at android.app.ActivityThread.main(ActivityThread.java:5039) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at java.lang.reflect.Method.invokeNative(Native Method) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at java.lang.reflect.Method.invoke(Method.java:511) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
    02-04 00:49:59.154: E/AndroidRuntime(7726):  at dalvik.system.NativeStart.main(Native Method) 
    02-04 00:50:07.004: I/Process(7726): Sending signal. PID: 7726 SIG: 9

這個代碼仍然沒有工作，請幫助我的人！

來源

2013-02-14 user1877082

更改SQLiteDatabase db = null;到SQLiteAdapter db = new SQLiteAdapter（this）並檢查它是否工作 – 2013-02-14 17:54:37

感謝您的幫助，但這不起作用它有一個錯誤下面的代碼新的SQLiteAdapter（this）; – user1877082 2013-02-14 18:08:04

而不是「this」嘗試使用classname.this（classname是你的類的名稱） – 2013-02-14 18:10:24

您的db是NULL並且您在下一行中使用！

SQLiteDatabase db = null; 

    Cursor c = db.rawQuery("SELECT email FROM MY_USERS_TABLE WHERE email='?' AND password='?'", new String[] {email, password});

修復它通過調用SQLiteDatabase db = new SQLiteAdapter(LoginActivity.this).openToWrite();

來源

2013-02-14 17:55:29 iTech

感謝你的幫助，但我試過這個，並得到了下面的代碼下的錯誤：new SQLiteAdapter（LoginActivity.this）.openToRead（）; – user1877082 2013-02-14 18:09:37

根據我更新的答案更改代碼，以使用'openToWrite（）'代替 – iTech 2013-02-14 18:12:25

嘗試過，並且當我點擊登錄按鈕時仍然停止工作 – user1877082 2013-02-14 18:15:45

使用此查詢 SELECT的電子郵件MY_USERS_TABLE WHERE電子郵件=？ AND密碼=？

您正在使用'？'使用？只有

來源

2013-02-14 17:57:59

我不確定，但你可以試試這個。

Cursor c = db.rawQuery("SELECT email FROM MY_USERS_TABLE WHERE email= '?' AND password='?'", new String[] {email, password});

或

Cursor c = db.rawQuery("SELECT email FROM MY_USERS_TABLE WHERE email= '+email+' AND password='+password+'";

請原諒我，如果我錯了。

來源

2016-05-25 10:58:46

Android登錄驗證

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