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我现在正在开发具有登录功能的 android 应用程序，我想让它让人们可以删除自己的帐户。我尝试了一些代码，但无法删除。这是我的删除方法的代码......我在 LoginDataBaseAdapter 类上声明了这个方法。

    public boolean deleteUser(String Username)
    {String user=String.valueOf(Username);
    return db.delete(TABLE_LOGIN, KEY_USER +"=" + user, null) > 0;}

然后我需要在activity中调用，不知道我的activity哪一部分出错了...由于代码很长，所以我尝试这样缩短...

package shiro.yuki; 
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;

public class menulayanan extends ListActivity {
 LoginDataBaseAdapter loginDataBaseAdapter;
 LoginDataBaseAdapter db;
 User user;

    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list);

    loginDataBaseAdapter=new LoginDataBaseAdapter(this);
        loginDataBaseAdapter=loginDataBaseAdapter.open();

    final LoginDataBaseAdapter db = new LoginDataBaseAdapter(this);
    Intent intent = getIntent();
    String uname = (String) intent.getSerializableExtra("username");
    final User user = db.getUserDetail(uname);


    String[] menulayanan = new String[] {"A","B"};
    setListAdapter(new array(this, menulayanan));

}

    public void detail() {
        db.deleteUser2(user.getUser()); // from logcat seems that this code is wrong

        Toast.makeText(menulayanan.this, "Hapus Sukses !", Toast.LENGTH_LONG).show();
        }


@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    Object o = this.getListAdapter().getItem(position);
    String pilihan = o.toString();
    tampilkanPilihan(pilihan);
}
public void tampilkanPilihan(String pilihan) {
    try {
        //Intent digunakan untuk sebagai pengenal suatu activity
        Intent i = null;
        if (pilihan.equals("A")) {
            i = new Intent(this, A.class);
                } else if (pilihan.equals("B")) {
            i = new Intent(this, B.class);
        } else {
            Toast.makeText(this,"Anda Memilih: " + pilihan + " , Actionnya belum dibuat", Toast.LENGTH_LONG).show();
        }
        startActivity(i);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.layout.opt_menu, menu);
    return true;
}

public boolean onOptionsItemSelected(MenuItem item) {
     switch (item.getItemId()) {
        case R.id.delete:
            AlertDialog.Builder builder3 = new AlertDialog.Builder(this);
            builder3.setMessage("Ingin menghapus account ?")
            .setCancelable(false).setPositiveButton("Ya",new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    detail(); // from logcat seems that this code is wrong too
                    keluar();
                }   
            })
            .setNegativeButton("Tidak",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            }).show();
            return true;

        default:
            return super.onOptionsItemSelected(item);
    }

}


public void keluar() {
    Intent awal = new Intent (this, Doa.class);
    startActivity(awal);
    finish();
}

public void belajar(){
    Intent Pembelajaran = new Intent (this, Pembelajaran.class);
    startActivity(A);   

}
}

从上面的代码中，有一个名为getUserDetail的方法，我也在LoginDataBaseAdapter类中声明了这个方法，我有点想用这个方法，我现在可以从谁是活动用户中获取用户名。这是代码..

    public User getUserDetail(String Username)
    {
    User user = null;
    Cursor cursor = db.query("login", new String[]{"Username", "Password"}, 
    "Username='" +Username+ "'", null, null, null, null);
    if(cursor.moveToFirst())
    {
    user = new User();
    user.setUser(cursor.getString(0));
    user.setPass(cursor.getString(1));
    }
    if(cursor != null && !cursor.isClosed())
    {
    cursor.close();
    }
    return user;
    }

用户类本身只是具有 getUser、getPassword、setUser 和 setPassword 方法的类

请帮忙.....

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