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POAndroid SQLite delete user failed
 

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  1. POAndroid SQLite delete user failed
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    <p>I'm now currently working on android application with login function, I want to make it so people can delete their own account. I tried some code but it failed to delete. Here's code for my delete method... I declared this method on LoginDataBaseAdapater Class. </p> <pre><code> public boolean deleteUser(String Username) {String user=String.valueOf(Username); return db.delete(TABLE_LOGIN, KEY_USER +"=" + user, null) &gt; 0;} </code></pre> <p>Then I need to call it in activity, I don't know which part of my activity is wrong... Since the code is very long, I try to shortened it like this...</p> <pre><code>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); } } </code></pre> <p>And from code above, there's a method called getUserDetail, I declared this method in LoginDataBaseAdapter Class too, I kinda think that with this method, I can catch username from who's the active user now. Here's the code..</p> <pre><code> 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 &amp;&amp; !cursor.isClosed()) { cursor.close(); } return user; } </code></pre> <p>User class itself is just class with some method of getUser,getPassword,setUser and setPassword</p> <p>Please help.....</p>
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    1. USraisa_
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    1. COYou should post the class where is defined `deleteUser`. Do you have any error logs in logcat?
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      1. POAndroid SQLite delete user failed
      1. USYoann Hercouet
    2. CO@YoannHercouet Yes, I'm sorry... I already include comment of which part of my code that error from logcat here's the logcat `05-30 14:07:13.902: E/AndroidRuntime(724): FATAL EXCEPTION: main` `05-30 14:07:13.902: E/AndroidRuntime(724): java.lang.NullPointerException ` `05-30 14:07:13.902: E/AndroidRuntime(724): at shiro.yuki.menulayanan.detail(menulayanan.java:47)` ` 05-30 14:07:13.902: E/AndroidRuntime(724): at shiro.yuki.menulayanan$5.onClick(menulayanan.java:147)` and here's the class where I declared getUserDetail http://tny.cz/e47b904b
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      1. POAndroid SQLite delete user failed
      1. USraisa_
    3. COYou should debug your application, the problem is not your delete function but I guess this variable: `user.getUser()` that is null.
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      1. POAndroid SQLite delete user failed
      1. USYoann Hercouet
 

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