Java tutorial
/* * Copyright (C) 2013-2014 Dominik Schrmann <dominik@dominikschuermann.de> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.thialfihar.android.apg.ui.dialog; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.os.Message; import android.os.Messenger; import android.os.RemoteException; import android.support.v4.app.DialogFragment; import android.support.v4.app.FragmentActivity; import android.view.LayoutInflater; import android.view.View; import android.widget.CheckBox; import android.widget.LinearLayout; import android.widget.TextView; import org.thialfihar.android.apg.Constants; import org.thialfihar.android.apg.Id; import org.thialfihar.android.apg.R; import org.thialfihar.android.apg.provider.KeychainContract; import org.thialfihar.android.apg.provider.KeychainDatabase; import org.thialfihar.android.apg.provider.ProviderHelper; import org.thialfihar.android.apg.util.Log; import java.util.ArrayList; public class DeleteKeyDialogFragment extends DialogFragment { private static final String ARG_MESSENGER = "messenger"; private static final String ARG_DELETE_KEY_RING_ROW_IDS = "delete_key_ring_row_ids"; public static final int MESSAGE_OKAY = 1; public static final int MESSAGE_ERROR = 0; private boolean mIsSingleSelection = false; private TextView mMainMessage; private CheckBox mCheckDeleteSecret; private LinearLayout mDeleteSecretKeyView; private View mInflateView; private Messenger mMessenger; /** * Creates new instance of this delete file dialog fragment */ public static DeleteKeyDialogFragment newInstance(Messenger messenger, long[] keyRingRowIds) { DeleteKeyDialogFragment frag = new DeleteKeyDialogFragment(); Bundle args = new Bundle(); args.putParcelable(ARG_MESSENGER, messenger); args.putLongArray(ARG_DELETE_KEY_RING_ROW_IDS, keyRingRowIds); //We don't need the key type frag.setArguments(args); return frag; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { final FragmentActivity activity = getActivity(); mMessenger = getArguments().getParcelable(ARG_MESSENGER); final long[] keyRingRowIds = getArguments().getLongArray(ARG_DELETE_KEY_RING_ROW_IDS); AlertDialog.Builder builder = new AlertDialog.Builder(activity); //Setup custom View to display in AlertDialog LayoutInflater inflater = activity.getLayoutInflater(); mInflateView = inflater.inflate(R.layout.view_key_delete_fragment, null); builder.setView(mInflateView); mDeleteSecretKeyView = (LinearLayout) mInflateView.findViewById(R.id.deleteSecretKeyView); mMainMessage = (TextView) mInflateView.findViewById(R.id.mainMessage); mCheckDeleteSecret = (CheckBox) mInflateView.findViewById(R.id.checkDeleteSecret); builder.setTitle(R.string.warning); //If only a single key has been selected if (keyRingRowIds.length == 1) { Uri dataUri; ArrayList<Long> publicKeyRings; //Any one will do mIsSingleSelection = true; long selectedRow = keyRingRowIds[0]; long keyType; publicKeyRings = ProviderHelper.getPublicKeyRingsRowIds(activity); if (publicKeyRings.contains(selectedRow)) { //TODO Should be a better method to do this other than getting all the KeyRings dataUri = KeychainContract.KeyRings.buildPublicKeyRingsUri(String.valueOf(selectedRow)); keyType = Id.type.public_key; } else { dataUri = KeychainContract.KeyRings.buildSecretKeyRingsUri(String.valueOf(selectedRow)); keyType = Id.type.secret_key; } String userId = ProviderHelper.getUserId(activity, dataUri); // Hide the Checkbox and TextView since this is a single selection, user will be // notified through message mDeleteSecretKeyView.setVisibility(View.GONE); // Set message depending on which key it is. mMainMessage.setText(getString(keyType == Id.type.secret_key ? R.string.secret_key_deletion_confirmation : R.string.public_key_deletetion_confirmation, userId)); } else { mDeleteSecretKeyView.setVisibility(View.VISIBLE); mMainMessage.setText(R.string.key_deletion_confirmation_multi); } builder.setIcon(R.drawable.ic_dialog_alert_holo_light); builder.setPositiveButton(R.string.btn_delete, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Uri queryUri = KeychainContract.KeyRings.buildUnifiedKeyRingsUri(); String[] projection = new String[] { KeychainContract.KeyRings.MASTER_KEY_ID, // 0 KeychainContract.KeyRings.TYPE // 1 }; // make selection with all entries where _ID is one of the given row ids String selection = KeychainDatabase.Tables.KEY_RINGS + "." + KeychainContract.KeyRings._ID + " IN("; String selectionIDs = ""; for (int i = 0; i < keyRingRowIds.length; i++) { selectionIDs += "'" + String.valueOf(keyRingRowIds[i]) + "'"; if (i + 1 < keyRingRowIds.length) { selectionIDs += ","; } } selection += selectionIDs + ")"; Cursor cursor = activity.getContentResolver().query(queryUri, projection, selection, null, null); long masterKeyId; long keyType; boolean isSuccessfullyDeleted; try { isSuccessfullyDeleted = false; while (cursor != null && cursor.moveToNext()) { masterKeyId = cursor.getLong(0); keyType = cursor.getLong(1); Log.d(Constants.TAG, "masterKeyId: " + masterKeyId + ", keyType:" + (keyType == KeychainContract.KeyTypes.PUBLIC ? "Public" : "Private")); if (keyType == KeychainContract.KeyTypes.SECRET) { if (mCheckDeleteSecret.isChecked() || mIsSingleSelection) { ProviderHelper.deleteUnifiedKeyRing(activity, String.valueOf(masterKeyId), true); } } else { ProviderHelper.deleteUnifiedKeyRing(activity, String.valueOf(masterKeyId), false); } } //Check if the selected rows have actually been deleted cursor = activity.getContentResolver().query(queryUri, projection, selection, null, null); if (cursor == null || cursor.getCount() == 0 || !mCheckDeleteSecret.isChecked()) { isSuccessfullyDeleted = true; } } finally { if (cursor != null) { cursor.close(); } } dismiss(); if (isSuccessfullyDeleted) { sendMessageToHandler(MESSAGE_OKAY, null); } else { sendMessageToHandler(MESSAGE_ERROR, null); } } }); builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { dismiss(); } }); return builder.create(); } /** * Send message back to handler which is initialized in a activity * * @param what Message integer you want to send */ private void sendMessageToHandler(Integer what, Bundle data) { Message msg = Message.obtain(); msg.what = what; if (data != null) { msg.setData(data); } try { mMessenger.send(msg); } catch (RemoteException e) { Log.w(Constants.TAG, "Exception sending message, Is handler present?", e); } catch (NullPointerException e) { Log.w(Constants.TAG, "Messenger is null!", e); } } }