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POAccess a database from a DialogFragment and toast a message
 

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  1. POAccess a database from a DialogFragment and toast a message
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    <p>I have a DialogFragment which displays a simple yes/no question. When the user presses "yes", I perform a database request (which basicaly deletes an entry). I then toast a message to report a success or failure to the user.</p> <p>I try to avoid calling the database from the UI thread, so I created a thread which will delete the entry, and from that thread I call a handler in the DialogFragment to display the toast message.</p> <p>My problem is that when the user presses the button, the thread is started and the dialog is closed. As the thread is started, the data is deleted from the database. But when I toast my message from the handler, the DialogFragment is already detached from the parent Activity so I don't have a context anymore to call Toast.makeText().</p> <p>My question is how can I toast the message ?</p> <p>I know I could create a Service to handle the database operation, but wouldn't it be too much hassle ? Is there a simpler way ?</p> <p>Thanks !</p> <p>EDIT : here is my code, to help you understand my problem :</p> <pre><code>public class EraseHistoryDialogFragment extends DialogFragment { private HistoryDatabaseHandler mHistoryDbHandler; private final static int MSG_NOTIFY_EMPTYDB = 1; private final static int MSG_NOTIFY_DELENTRY = 2; private final static int MSG_NOTIFY_NODELETION = 3; private Context mContext; private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_NOTIFY_DELENTRY: Toast.makeText(mContext, getS tring(R.string.historytab_erased_entry), Toast.LENGTH_SHORT).show(); break; case MSG_NOTIFY_EMPTYDB: Toast.makeText(mContext, getS tring(R.string.historytab_history_cleared), Toast.LENGTH_SHORT).show(); break; case MSG_NOTIFY_NODELETION: Toast.makeText(mContext, getS tring(R.string.historytab_erase_failed), Toast.LENGTH_SHORT).show(); break; } }; }; private Runnable mEraseHistoryRunnable = new Runnable() { @Override public void run() { if (mHistoryDbHandler.clearAllTables()) { mHandler.sendEmptyMessage(MSG_NOTIFY_EMPTYDB); } else { mHandler.sendEmptyMessage(MSG_NOTIFY_NODELETION); } } }; private class EraseEntryRunnable implements Runnable { private String mEntryId; public EraseEntryRunnable(String entryID) { mEntryId = entryID; } @Override public void run() { if (mHistoryDbHandler.deleteEntry(mEntryId)) { mHandler.sendEmptyMessage(MSG_NOTIFY_DELENTRY); } else { mHandler.sendEmptyMessage(MSG_NOTIFY_NODELETION); } } }; public static EraseHistoryDialogFragment newInstance(String message, String entryID, boolean eraseAll) { EraseHistoryDialogFragment frag = new EraseHistoryDialogFragment(); Bundle args = new Bundle(); args.putString("message", message); args.putString("entryid", entryID); args.putBoolean("eraseall", eraseAll); frag.setArguments(args); return frag; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { mHistoryDbHandler = HistoryDatabaseHandler.getInstance(getActivity()); mContext = getActivity().getApplicationContext(); String message = getArguments().getString("message"); final String entryID = getArguments().getString("entryid"); final boolean eraseAll = getArguments().getBoolean("eraseall"); return new AlertDialog.Builder(getActivity()) .setMessage(message) .setPositiveButton(R.string.groupstab_yes, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { if (eraseAll) { Thread emptyDbT = new Thread( mEraseHistoryRunnable); emptyDbT.start(); } else { Thread deleteEntryT = new Thread( new EraseEntryRunnable(entryID)); deleteEntryT.start(); } } }) .setNegativeButton(R.string.groupstab_no, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { getDialog().dismiss(); } }).create(); } </code></pre> <p>}</p>
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    1. USErGo_404
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    1. COHave you try any answer?
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      1. USSanket Kachhela
    2. COI have tried both (getActivity() and getActivity.getApplicationContext()) and none have worked so far. EDIT : but I agree that getApplicationContext() should be what I was looking for
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    3. COActually the getApplicationContext() is the answer I needed. The only thing was that I forgot to use this context for the "getString" methods inside my handler.
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      1. USErGo_404
 

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