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POAndroid: Deleting a row from SQLite table and updating a ListView
 

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  1. POAndroid: Deleting a row from SQLite table and updating a ListView
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    <p>I am new to android development and have come across a problem with deleting a row in a SQLite table that I have not been able to find a solution to. When I try to delete a row nothing is happening. </p> <p>In my activity, called 'MainActivity,' I am using a context menu to call a method to delete an item from the list. This portion of code is as follows:</p> <pre><code>case R.id.delete_program: DBAdapter adap = new DBAdapter(this); adap.open(); long pass = (long) (position + 1); adap.removeFromCurrent(pass); adap.close(); Runnable run = new Runnable() { public void run(){ refreshCurrent(getApplicationContext()); } }; runOnUiThread(run); proAdapt.notifyDataSetChanged(); return true; </code></pre> <p>In 'DBAdapter' the method removeFromCurrent():</p> <pre><code>public boolean removeFromCurrent(long cp_id) { return this.dB.delete(PROGRAMS_TABLE, CP_ID + '=' + cp_id, null) &gt; 0; } </code></pre> <p>In 'MainActivity' the method refreshCurrent():</p> <pre><code>public static void refreshCurrent(Context context) { CURRENT.clear(); DBAdapter adap = new DBAdapter(context); adap.open(); ArrayList&lt;Program&gt; temp = adap.getCurrentPrograms(); for(Program item : temp) { Toast.makeText(context, "Item added: " + item.getName(), Toast.LENGTH_SHORT).show(); CURRENT.add(item); } adap.close(); } </code></pre> <p>I'm using the toast to check if the table has changed but the display has not. From 'DBAdapter' the method getCurrentPrograms():</p> <pre><code>public ArrayList&lt;Program&gt; getCurrentPrograms() { ArrayList&lt;Program&gt; list = new ArrayList&lt;Program&gt;(); Cursor cursor = this.dB.query(PROGRAMS_TABLE, new String[] { CP_ID, CP_NAME, ACTUAL_DAY, D_ID, CP_CYCLE, CP_DAY_ONE }, null, null, null, null, null); int rows = cursor.getCount(); if(cursor != null) cursor.moveToFirst(); for(int i = 1; i &lt;= rows; i++) { list.add(new Program(cursor.getString(cursor.getColumnIndex(CP_NAME)), cursor.getInt(cursor.getColumnIndex(ACTUAL_DAY)), cursor.getInt(cursor.getColumnIndex(CP_DAY_ONE)), cursor.getInt(cursor.getColumnIndex(CP_CYCLE)))); cursor.moveToNext(); } return list; } </code></pre> <p>The ArrayList 'CURRENT' is the list used to populate the ListView. My thinking was that I would be able to delete a row from the table and then repopulate this list as well as the ListView. I was also curious as to what happened to a SQLite table once a row is removed; do the other rows move up a position, or do they stay in the same place?</p> <p>I am still very new to this so any help about my problem or tips for the rest of my code would be much appreciated. Let me know what else I'm doing wrong with my programming.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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