ListView From Sqlite in android

Question

As I searched whole net still in problem with ListView From Sqlite. After searching so much i am trying my project on android hive example Link here. So in this in Database

Answer 1

Below is a code using which i suppose you can meet your requirements. In the below code i would fetch contacts saved in my database and display it in a listView. If the user wants to delete a contact from the database, then he shall long press on the item, and using the dialog that appears, he can delete the contact. Below is the code:

    public class viewContacts extends ListActivity {

        private static final String TAG = "MYRECORDER";

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.showcontacts);

            //Creating a List View
            ArrayList listItems = new ArrayList();
            ArrayAdapter adapter = new ArrayAdapter(this, 
                    android.R.layout.simple_list_item_1, listItems);
            ListView mylist=(ListView) findViewById(android.R.id.list);
            mylist.setAdapter(adapter);


//Creating or opening an eisting database
            SQLiteDatabase db=openOrCreateDatabase("MYDB", Context.MODE_PRIVATE, null);

//Getting a cursor to fetch data from the database
              Cursor c=db.rawQuery("SELECT Number,Name FROM myTbl", null);
              Log.d(TAG, "Cursor reference obtained...");
              c.moveToFirst();
              Log.d(TAG, "Cursor Moved to First Number....");
              if(c!=null){
//If there are contents in the database, then c!=null, so using do-while loop access data // in database
                do{
                    String num=c.getString(c.getColumnIndex("Number"));
                    String name=c.getString(c.getColumnIndex("Name"));
                    String Name_num=name+" : "+num;
                    listItems.add(Name_num);
                    c.moveToNext();
                }while(!c.isAfterLast());

//update the list
                adapter.notifyDataSetChanged();

//closing the database after use
                db.close();

//Below is the code to delete items in data base
                mylist.setOnItemClickListener(new OnItemClickListener() {
                    String str=null;    
                    public void onItemClick(AdapterView arg0, View view,
                            int arg2, long arg3) {

                        // TODO Auto-generated method stub
                        String item = ((TextView)view).getText().toString();
                         str=item.substring(item.lastIndexOf('+'));
                         Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();
                        //Creating an Alert Dialog
                        AlertDialog .Builder builder=new AlertDialog.Builder(viewContacts.this);
                        builder.setMessage("Are you sure you want to delete the contact "+str+" ?");
                        builder.setCancelable(false);
                        builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog, int which) {
                                // TODO Auto-generated method stub
                                SQLiteDatabase db=openOrCreateDatabase("MYDB", MODE_PRIVATE, null);
                                Toast.makeText(getBaseContext(), "The contact: "+str+" was successfully deleted", Toast.LENGTH_LONG).show();
                                String table="myTbl";
                                String whereClause = "Number = ?";
                                String[] whereArgs = new String[] { str };
                                db.delete(table, whereClause, whereArgs);
                                db.close();
                            }
                        });
                      builder.setNegativeButton("No", new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog, int which) {
                            // TODO Auto-generated method stub
                            dialog.cancel();
                        }
                    } );
                      AlertDialog alert=builder.create();
                      alert.show();
                    }           
                });
        }
        }
    }