src/com/android/cellbroadcastreceiver/CellBroadcastListActivity.java - platform/packages/apps/CellBroadcastReceiver - Git at Google

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.cellbroadcastreceiver;

 import android.annotation.Nullable;
 import android.app.ActionBar;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.FragmentManager;
 import android.app.ListFragment;
 import android.app.LoaderManager;
 import android.app.NotificationManager;
 import android.content.Context;
 import android.content.CursorLoader;
 import android.content.DialogInterface;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.content.Loader;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.Telephony;
 import android.telephony.SmsCbMessage;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.View.OnCreateContextMenuListener;
 import android.view.ViewGroup;
 import android.widget.CursorAdapter;
 import android.widget.ListView;
 import android.widget.TextView;

 import java.util.ArrayList;

 /**
  * This activity provides a list view of received cell broadcasts. Most of the work is handled
  * in the inner CursorLoaderListFragment class.
  */
 public class CellBroadcastListActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         ActionBar actionBar = getActionBar();
         if (actionBar != null) {
             // android.R.id.home will be triggered in onOptionsItemSelected()
             actionBar.setDisplayHomeAsUpEnabled(true);
         }

         setTitle(getString(R.string.cb_list_activity_title));

         // Dismiss the notification that brought us here (if any).
         ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE))
                 .cancel(CellBroadcastAlertService.NOTIFICATION_ID);

         FragmentManager fm = getFragmentManager();

         // Create the list fragment and add it as our sole content.
         if (fm.findFragmentById(android.R.id.content) == null) {
             CursorLoaderListFragment listFragment = new CursorLoaderListFragment();
             fm.beginTransaction().add(android.R.id.content, listFragment).commit();
         }
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             // Respond to the action bar's Up/Home button
             case android.R.id.home:
                 finish();
                 return true;
         }
         return super.onOptionsItemSelected(item);
     }

     /**
      * List fragment queries SQLite database on worker thread.
      */
     public static class CursorLoaderListFragment extends ListFragment
             implements LoaderManager.LoaderCallbacks<Cursor> {
         private static final String TAG = CellBroadcastListActivity.class.getSimpleName();
         private static final boolean DBG = true;

         // IDs of the main menu items.
         private static final int MENU_DELETE_ALL            = 3;
         private static final int MENU_SHOW_REGULAR_MESSAGES = 4;
         private static final int MENU_SHOW_ALL_MESSAGES     = 5;

         // Load the history from cell broadcast receiver database
         private static final int LOADER_NORMAL_HISTORY      = 1;
         // Load the history from cell broadcast service. This will include all non-shown messages.
         private static final int LOADER_HISTORY_FROM_CBS    = 2;

         private static final String KEY_LOADER_ID = "loader_id";

         // IDs of the context menu items (package local, accessed from inner DeleteThreadListener).
         static final int MENU_DELETE               = 0;
         static final int MENU_VIEW_DETAILS         = 1;

         // cell broadcast provider from cell broadcast service.
         public static final Uri CONTENT_URI = Uri.parse("content://cellbroadcasts");

         // Query columns for provider from cell broadcast service.
         public static final String[] QUERY_COLUMNS = {
                 Telephony.CellBroadcasts._ID,
                 Telephony.CellBroadcasts.SLOT_INDEX,
                 Telephony.CellBroadcasts.SUBSCRIPTION_ID,
                 Telephony.CellBroadcasts.GEOGRAPHICAL_SCOPE,
                 Telephony.CellBroadcasts.PLMN,
                 Telephony.CellBroadcasts.LAC,
                 Telephony.CellBroadcasts.CID,
                 Telephony.CellBroadcasts.SERIAL_NUMBER,
                 Telephony.CellBroadcasts.SERVICE_CATEGORY,
                 Telephony.CellBroadcasts.LANGUAGE_CODE,
                 Telephony.CellBroadcasts.DATA_CODING_SCHEME,
                 Telephony.CellBroadcasts.MESSAGE_BODY,
                 Telephony.CellBroadcasts.MESSAGE_FORMAT,
                 Telephony.CellBroadcasts.MESSAGE_PRIORITY,
                 Telephony.CellBroadcasts.ETWS_WARNING_TYPE,
                 Telephony.CellBroadcasts.CMAS_MESSAGE_CLASS,
                 Telephony.CellBroadcasts.CMAS_CATEGORY,
                 Telephony.CellBroadcasts.CMAS_RESPONSE_TYPE,
                 Telephony.CellBroadcasts.CMAS_SEVERITY,
                 Telephony.CellBroadcasts.CMAS_URGENCY,
                 Telephony.CellBroadcasts.CMAS_CERTAINTY,
                 Telephony.CellBroadcasts.RECEIVED_TIME,
                 Telephony.CellBroadcasts.LOCATION_CHECK_TIME,
                 Telephony.CellBroadcasts.MESSAGE_BROADCASTED,
                 Telephony.CellBroadcasts.MESSAGE_DISPLAYED,
                 Telephony.CellBroadcasts.GEOMETRIES,
                 Telephony.CellBroadcasts.MAXIMUM_WAIT_TIME
         };

         // This is the Adapter being used to display the list's data.
         private CursorAdapter mAdapter;

         private int mCurrentLoaderId = 0;

         @Override
         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);

             // We have a menu item to show in action bar.
             setHasOptionsMenu(true);
         }

         @Override
         public View onCreateView(LayoutInflater inflater, ViewGroup container,
                 Bundle savedInstanceState) {
             return inflater.inflate(R.layout.cell_broadcast_list_screen, container, false);
         }

         @Override
         public void onActivityCreated(Bundle savedInstanceState) {
             super.onActivityCreated(savedInstanceState);

             // Set context menu for long-press.
             ListView listView = getListView();
             listView.setOnCreateContextMenuListener(mOnCreateContextMenuListener);

             // Create a cursor adapter to display the loaded data.
             mAdapter = new CellBroadcastCursorAdapter(getActivity());
             setListAdapter(mAdapter);

             mCurrentLoaderId = LOADER_NORMAL_HISTORY;
             if (savedInstanceState != null && savedInstanceState.containsKey(KEY_LOADER_ID)) {
                 mCurrentLoaderId = savedInstanceState.getInt(KEY_LOADER_ID);
             }

             if (DBG) Log.d(TAG, "onActivityCreated: id=" + mCurrentLoaderId);

             // Prepare the loader.  Either re-connect with an existing one,
             // or start a new one.
             getLoaderManager().initLoader(mCurrentLoaderId, null, this);
         }

         @Override
         public void onSaveInstanceState(Bundle outState) {
             // Save the current id for later restoring activity.
             if (DBG) Log.d(TAG, "onSaveInstanceState: id=" + mCurrentLoaderId);
             outState.putInt(KEY_LOADER_ID, mCurrentLoaderId);
         }

         @Override
         public void onResume() {
             super.onResume();
             if (DBG) Log.d(TAG, "onResume");
             if (mCurrentLoaderId != 0) {
                 getLoaderManager().restartLoader(mCurrentLoaderId, null, this);
             }
         }

         @Override
         public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
             menu.add(0, MENU_DELETE_ALL, 0, R.string.menu_delete_all).setIcon(
                     android.R.drawable.ic_menu_delete);
             menu.add(0, MENU_SHOW_ALL_MESSAGES, 0, R.string.show_all_messages);
             menu.add(0, MENU_SHOW_REGULAR_MESSAGES, 0, R.string.show_regular_messages);
         }

         @Override
         public void onPrepareOptionsMenu(Menu menu) {
             boolean isTestingMode = CellBroadcastReceiver.isTestingMode(
                     getContext());
             // Only allowing delete all messages when not in testing mode because when testing mode
             // is enabled, the database source is from cell broadcast service. Deleting them does
             // not affect the database in cell broadcast receiver. Hide the options to reduce
             // confusion.
             menu.findItem(MENU_DELETE_ALL).setVisible(!mAdapter.isEmpty() && !isTestingMode);
             menu.findItem(MENU_SHOW_ALL_MESSAGES).setVisible(isTestingMode
                     && mCurrentLoaderId == LOADER_NORMAL_HISTORY);
             menu.findItem(MENU_SHOW_REGULAR_MESSAGES).setVisible(isTestingMode
                     && mCurrentLoaderId == LOADER_HISTORY_FROM_CBS);
         }

         @Override
         public void onListItemClick(ListView l, View v, int position, long id) {
             CellBroadcastListItem cbli = (CellBroadcastListItem) v;
             showDialogAndMarkRead(cbli.getMessage());
         }

         @Override
         public Loader<Cursor> onCreateLoader(int id, Bundle args) {
             mCurrentLoaderId = id;
             if (id == LOADER_NORMAL_HISTORY) {
                 Log.d(TAG, "onCreateLoader: normal history.");
                 return new CursorLoader(getActivity(), CellBroadcastContentProvider.CONTENT_URI,
                         CellBroadcastContentProvider.QUERY_COLUMNS, null, null,
                         Telephony.CellBroadcasts.DELIVERY_TIME + " DESC");
             } else if (id == LOADER_HISTORY_FROM_CBS) {
                 Log.d(TAG, "onCreateLoader: history from cell broadcast service");
                 return new CursorLoader(getActivity(), CONTENT_URI,
                         QUERY_COLUMNS, null, null,
                         Telephony.CellBroadcasts.RECEIVED_TIME + " DESC");
             }

             return null;
         }

         @Override
         public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
             if (DBG) Log.d(TAG, "onLoadFinished");
             // Swap the new cursor in.  (The framework will take care of closing the
             // old cursor once we return.)
             mAdapter.swapCursor(data);
             getActivity().invalidateOptionsMenu();
             updateNoAlertTextVisibility();
         }

         @Override
         public void onLoaderReset(Loader<Cursor> loader) {
             if (DBG) Log.d(TAG, "onLoaderReset");
             // This is called when the last Cursor provided to onLoadFinished()
             // above is about to be closed.  We need to make sure we are no
             // longer using it.
             mAdapter.swapCursor(null);
         }

         private void showDialogAndMarkRead(SmsCbMessage message) {
             // show emergency alerts with the warning icon, but don't play alert tone
             Intent i = new Intent(getActivity(), CellBroadcastAlertDialog.class);
             ArrayList<SmsCbMessage> messageList = new ArrayList<>();
             messageList.add(message);
             i.putParcelableArrayListExtra(CellBroadcastAlertService.SMS_CB_MESSAGE_EXTRA,
                     messageList);
             startActivity(i);
         }

         private void showBroadcastDetails(SmsCbMessage message, long locationCheckTime,
                                           boolean messageDisplayed, String geometry) {
             // show dialog with delivery date/time and alert details
             CharSequence details = CellBroadcastResources.getMessageDetails(getActivity(),
                     mCurrentLoaderId == LOADER_HISTORY_FROM_CBS, message, locationCheckTime,
                     messageDisplayed, geometry);
             int titleId = (mCurrentLoaderId == LOADER_NORMAL_HISTORY)
                     ? R.string.view_details_title : R.string.view_details_debugging_title;
             new AlertDialog.Builder(getActivity())
                     .setTitle(titleId)
                     .setMessage(details)
                     .setCancelable(true)
                     .show();
         }

         private final OnCreateContextMenuListener mOnCreateContextMenuListener =
                 (menu, v, menuInfo) -> {
                     menu.setHeaderTitle(R.string.message_options);
                     menu.add(0, MENU_VIEW_DETAILS, 0, R.string.menu_view_details);
                     if (mCurrentLoaderId == LOADER_NORMAL_HISTORY) {
                         menu.add(0, MENU_DELETE, 0, R.string.menu_delete);
                     }
                 };

         private void updateNoAlertTextVisibility() {
             TextView noAlertsTextView = getActivity().findViewById(R.id.empty);
             if (noAlertsTextView != null) {
                 noAlertsTextView.setVisibility(!hasAlertsInHistory()
                         ? View.VISIBLE : View.INVISIBLE);
             }
         }

         /**
          * @return {@code true} if the alert history database has any item
          */
         private boolean hasAlertsInHistory() {
             return mAdapter.getCursor().getCount() > 0;
         }

         /**
          * Get the location check time of the message.
          *
          * @param cursor The cursor of the database
          * @return The EPOCH time in milliseconds that the location check was performed on the
          * message. -1 if the information is not available.
          */
         private long getLocationCheckTime(Cursor cursor) {
             if (mCurrentLoaderId != LOADER_HISTORY_FROM_CBS) return -1;
             return cursor.getLong(cursor.getColumnIndex(
                     Telephony.CellBroadcasts.LOCATION_CHECK_TIME));
         }

         /**
          * Check if the message has been displayed to the user or not
          *
          * @param cursor The cursor of the database
          * @return {@code true} if the message was displayed to the user, otherwise {@code false}.
          */
         private boolean wasMessageDisplayed(Cursor cursor) {
             if (mCurrentLoaderId != LOADER_HISTORY_FROM_CBS) return true;
             return cursor.getInt(cursor.getColumnIndex(
                     Telephony.CellBroadcasts.MESSAGE_DISPLAYED)) != 0;
         }

         /**
          * Get the geometry string from the message if available.
          *
          * @param cursor The cursor of the database
          * @return The geometry string
          */
         private @Nullable String getGeometryString(Cursor cursor) {
             if (mCurrentLoaderId != LOADER_HISTORY_FROM_CBS) return null;
             if (cursor.getColumnIndex(Telephony.CellBroadcasts.GEOMETRIES) >= 0) {
                 return cursor.getString(cursor.getColumnIndex(Telephony.CellBroadcasts.GEOMETRIES));
             }
             return null;
         }

         @Override
         public boolean onContextItemSelected(MenuItem item) {
             Cursor cursor = mAdapter.getCursor();
             if (cursor != null && cursor.getPosition() >= 0) {
                 switch (item.getItemId()) {
                     case MENU_DELETE:
                         confirmDeleteThread(cursor.getLong(cursor.getColumnIndexOrThrow(
                                 Telephony.CellBroadcasts._ID)));
                         break;

                     case MENU_VIEW_DETAILS:
                         showBroadcastDetails(CellBroadcastCursorAdapter.createFromCursor(
                                 getContext(), cursor), getLocationCheckTime(cursor),
                                 wasMessageDisplayed(cursor), getGeometryString(cursor));
                         break;

                     default:
                         break;
                 }
             }
             return super.onContextItemSelected(item);
         }

         @Override
         public boolean onOptionsItemSelected(MenuItem item) {
             switch(item.getItemId()) {
                 case MENU_DELETE_ALL:
                     confirmDeleteThread(-1);
                     break;

                 case MENU_SHOW_ALL_MESSAGES:
                     getLoaderManager().restartLoader(LOADER_HISTORY_FROM_CBS, null, this);
                     break;

                 case MENU_SHOW_REGULAR_MESSAGES:
                     getLoaderManager().restartLoader(LOADER_NORMAL_HISTORY, null, this);
                     break;

                 default:
                     return true;
             }
             return false;
         }

         /**
          * Start the process of putting up a dialog to confirm deleting a broadcast.
          * @param rowId the row ID of the broadcast to delete, or -1 to delete all broadcasts
          */
         public void confirmDeleteThread(long rowId) {
             DeleteThreadListener listener = new DeleteThreadListener(rowId);
             confirmDeleteThreadDialog(listener, (rowId == -1), getActivity());
         }

         /**
          * Build and show the proper delete broadcast dialog. The UI is slightly different
          * depending on whether there are locked messages in the thread(s) and whether we're
          * deleting a single broadcast or all broadcasts.
          * @param listener gets called when the delete button is pressed
          * @param deleteAll whether to show a single thread or all threads UI
          * @param context used to load the various UI elements
          */
         public static void confirmDeleteThreadDialog(DeleteThreadListener listener,
                 boolean deleteAll, Context context) {
             AlertDialog.Builder builder = new AlertDialog.Builder(context);
             builder.setIconAttribute(android.R.attr.alertDialogIcon)
                     .setCancelable(true)
                     .setPositiveButton(R.string.button_delete, listener)
                     .setNegativeButton(R.string.button_cancel, null)
                     .setMessage(deleteAll ? R.string.confirm_delete_all_broadcasts
                             : R.string.confirm_delete_broadcast)
                     .show();
         }

         public class DeleteThreadListener implements OnClickListener {
             private final long mRowId;

             public DeleteThreadListener(long rowId) {
                 mRowId = rowId;
             }

             @Override
             public void onClick(DialogInterface dialog, int whichButton) {
                 // delete from database on a background thread
                 new CellBroadcastContentProvider.AsyncCellBroadcastTask(
                         getActivity().getContentResolver()).execute(
                                 (CellBroadcastContentProvider.CellBroadcastOperation) provider -> {
                                     if (mRowId != -1) {
                                         return provider.deleteBroadcast(mRowId);
                                     } else {
                                         return provider.deleteAllBroadcasts();
                                     }
                                 });

                 dialog.dismiss();
             }
         }
     }
 }
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.cellbroadcastreceiver;

	import android.annotation.Nullable;
	import android.app.ActionBar;
	import android.app.Activity;
	import android.app.AlertDialog;
	import android.app.FragmentManager;
	import android.app.ListFragment;
	import android.app.LoaderManager;
	import android.app.NotificationManager;
	import android.content.Context;
	import android.content.CursorLoader;
	import android.content.DialogInterface;
	import android.content.DialogInterface.OnClickListener;
	import android.content.Intent;
	import android.content.Loader;
	import android.database.Cursor;
	import android.net.Uri;
	import android.os.Bundle;
	import android.provider.Telephony;
	import android.telephony.SmsCbMessage;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.Menu;
	import android.view.MenuInflater;
	import android.view.MenuItem;
	import android.view.View;
	import android.view.View.OnCreateContextMenuListener;
	import android.view.ViewGroup;
	import android.widget.CursorAdapter;
	import android.widget.ListView;
	import android.widget.TextView;

	import java.util.ArrayList;

	/**
	* This activity provides a list view of received cell broadcasts. Most of the work is handled
	* in the inner CursorLoaderListFragment class.
	*/
	public class CellBroadcastListActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	ActionBar actionBar = getActionBar();
	if (actionBar != null) {
	// android.R.id.home will be triggered in onOptionsItemSelected()
	actionBar.setDisplayHomeAsUpEnabled(true);
	}

	setTitle(getString(R.string.cb_list_activity_title));

	// Dismiss the notification that brought us here (if any).
	((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE))
	.cancel(CellBroadcastAlertService.NOTIFICATION_ID);

	FragmentManager fm = getFragmentManager();

	// Create the list fragment and add it as our sole content.
	if (fm.findFragmentById(android.R.id.content) == null) {
	CursorLoaderListFragment listFragment = new CursorLoaderListFragment();
	fm.beginTransaction().add(android.R.id.content, listFragment).commit();
	}
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	switch (item.getItemId()) {
	// Respond to the action bar's Up/Home button
	case android.R.id.home:
	finish();
	return true;
	}
	return super.onOptionsItemSelected(item);
	}

	/**
	* List fragment queries SQLite database on worker thread.
	*/
	public static class CursorLoaderListFragment extends ListFragment
	implements LoaderManager.LoaderCallbacks<Cursor> {
	private static final String TAG = CellBroadcastListActivity.class.getSimpleName();
	private static final boolean DBG = true;

	// IDs of the main menu items.
	private static final int MENU_DELETE_ALL = 3;
	private static final int MENU_SHOW_REGULAR_MESSAGES = 4;
	private static final int MENU_SHOW_ALL_MESSAGES = 5;

	// Load the history from cell broadcast receiver database
	private static final int LOADER_NORMAL_HISTORY = 1;
	// Load the history from cell broadcast service. This will include all non-shown messages.
	private static final int LOADER_HISTORY_FROM_CBS = 2;

	private static final String KEY_LOADER_ID = "loader_id";

	// IDs of the context menu items (package local, accessed from inner DeleteThreadListener).
	static final int MENU_DELETE = 0;
	static final int MENU_VIEW_DETAILS = 1;

	// cell broadcast provider from cell broadcast service.
	public static final Uri CONTENT_URI = Uri.parse("content://cellbroadcasts");

	// Query columns for provider from cell broadcast service.
	public static final String[] QUERY_COLUMNS = {
	Telephony.CellBroadcasts._ID,
	Telephony.CellBroadcasts.SLOT_INDEX,
	Telephony.CellBroadcasts.SUBSCRIPTION_ID,
	Telephony.CellBroadcasts.GEOGRAPHICAL_SCOPE,
	Telephony.CellBroadcasts.PLMN,
	Telephony.CellBroadcasts.LAC,
	Telephony.CellBroadcasts.CID,
	Telephony.CellBroadcasts.SERIAL_NUMBER,
	Telephony.CellBroadcasts.SERVICE_CATEGORY,
	Telephony.CellBroadcasts.LANGUAGE_CODE,
	Telephony.CellBroadcasts.DATA_CODING_SCHEME,
	Telephony.CellBroadcasts.MESSAGE_BODY,
	Telephony.CellBroadcasts.MESSAGE_FORMAT,
	Telephony.CellBroadcasts.MESSAGE_PRIORITY,
	Telephony.CellBroadcasts.ETWS_WARNING_TYPE,
	Telephony.CellBroadcasts.CMAS_MESSAGE_CLASS,
	Telephony.CellBroadcasts.CMAS_CATEGORY,
	Telephony.CellBroadcasts.CMAS_RESPONSE_TYPE,
	Telephony.CellBroadcasts.CMAS_SEVERITY,
	Telephony.CellBroadcasts.CMAS_URGENCY,
	Telephony.CellBroadcasts.CMAS_CERTAINTY,
	Telephony.CellBroadcasts.RECEIVED_TIME,
	Telephony.CellBroadcasts.LOCATION_CHECK_TIME,
	Telephony.CellBroadcasts.MESSAGE_BROADCASTED,
	Telephony.CellBroadcasts.MESSAGE_DISPLAYED,
	Telephony.CellBroadcasts.GEOMETRIES,
	Telephony.CellBroadcasts.MAXIMUM_WAIT_TIME
	};

	// This is the Adapter being used to display the list's data.
	private CursorAdapter mAdapter;

	private int mCurrentLoaderId = 0;

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	// We have a menu item to show in action bar.
	setHasOptionsMenu(true);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	Bundle savedInstanceState) {
	return inflater.inflate(R.layout.cell_broadcast_list_screen, container, false);
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);

	// Set context menu for long-press.
	ListView listView = getListView();
	listView.setOnCreateContextMenuListener(mOnCreateContextMenuListener);

	// Create a cursor adapter to display the loaded data.
	mAdapter = new CellBroadcastCursorAdapter(getActivity());
	setListAdapter(mAdapter);

	mCurrentLoaderId = LOADER_NORMAL_HISTORY;
	if (savedInstanceState != null && savedInstanceState.containsKey(KEY_LOADER_ID)) {
	mCurrentLoaderId = savedInstanceState.getInt(KEY_LOADER_ID);
	}

	if (DBG) Log.d(TAG, "onActivityCreated: id=" + mCurrentLoaderId);

	// Prepare the loader. Either re-connect with an existing one,
	// or start a new one.
	getLoaderManager().initLoader(mCurrentLoaderId, null, this);
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
	// Save the current id for later restoring activity.
	if (DBG) Log.d(TAG, "onSaveInstanceState: id=" + mCurrentLoaderId);
	outState.putInt(KEY_LOADER_ID, mCurrentLoaderId);
	}

	@Override
	public void onResume() {
	super.onResume();
	if (DBG) Log.d(TAG, "onResume");
	if (mCurrentLoaderId != 0) {
	getLoaderManager().restartLoader(mCurrentLoaderId, null, this);
	}
	}

	@Override
	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
	menu.add(0, MENU_DELETE_ALL, 0, R.string.menu_delete_all).setIcon(
	android.R.drawable.ic_menu_delete);
	menu.add(0, MENU_SHOW_ALL_MESSAGES, 0, R.string.show_all_messages);
	menu.add(0, MENU_SHOW_REGULAR_MESSAGES, 0, R.string.show_regular_messages);
	}

	@Override
	public void onPrepareOptionsMenu(Menu menu) {
	boolean isTestingMode = CellBroadcastReceiver.isTestingMode(
	getContext());
	// Only allowing delete all messages when not in testing mode because when testing mode
	// is enabled, the database source is from cell broadcast service. Deleting them does
	// not affect the database in cell broadcast receiver. Hide the options to reduce
	// confusion.
	menu.findItem(MENU_DELETE_ALL).setVisible(!mAdapter.isEmpty() && !isTestingMode);
	menu.findItem(MENU_SHOW_ALL_MESSAGES).setVisible(isTestingMode
	&& mCurrentLoaderId == LOADER_NORMAL_HISTORY);
	menu.findItem(MENU_SHOW_REGULAR_MESSAGES).setVisible(isTestingMode
	&& mCurrentLoaderId == LOADER_HISTORY_FROM_CBS);
	}

	@Override
	public void onListItemClick(ListView l, View v, int position, long id) {
	CellBroadcastListItem cbli = (CellBroadcastListItem) v;
	showDialogAndMarkRead(cbli.getMessage());
	}

	@Override
	public Loader<Cursor> onCreateLoader(int id, Bundle args) {
	mCurrentLoaderId = id;
	if (id == LOADER_NORMAL_HISTORY) {
	Log.d(TAG, "onCreateLoader: normal history.");
	return new CursorLoader(getActivity(), CellBroadcastContentProvider.CONTENT_URI,
	CellBroadcastContentProvider.QUERY_COLUMNS, null, null,
	Telephony.CellBroadcasts.DELIVERY_TIME + " DESC");
	} else if (id == LOADER_HISTORY_FROM_CBS) {
	Log.d(TAG, "onCreateLoader: history from cell broadcast service");
	return new CursorLoader(getActivity(), CONTENT_URI,
	QUERY_COLUMNS, null, null,
	Telephony.CellBroadcasts.RECEIVED_TIME + " DESC");
	}

	return null;
	}

	@Override
	public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
	if (DBG) Log.d(TAG, "onLoadFinished");
	// Swap the new cursor in. (The framework will take care of closing the
	// old cursor once we return.)
	mAdapter.swapCursor(data);
	getActivity().invalidateOptionsMenu();
	updateNoAlertTextVisibility();
	}

	@Override
	public void onLoaderReset(Loader<Cursor> loader) {
	if (DBG) Log.d(TAG, "onLoaderReset");
	// This is called when the last Cursor provided to onLoadFinished()
	// above is about to be closed. We need to make sure we are no
	// longer using it.
	mAdapter.swapCursor(null);
	}

	private void showDialogAndMarkRead(SmsCbMessage message) {
	// show emergency alerts with the warning icon, but don't play alert tone
	Intent i = new Intent(getActivity(), CellBroadcastAlertDialog.class);
	ArrayList<SmsCbMessage> messageList = new ArrayList<>();
	messageList.add(message);
	i.putParcelableArrayListExtra(CellBroadcastAlertService.SMS_CB_MESSAGE_EXTRA,
	messageList);
	startActivity(i);
	}

	private void showBroadcastDetails(SmsCbMessage message, long locationCheckTime,
	boolean messageDisplayed, String geometry) {
	// show dialog with delivery date/time and alert details
	CharSequence details = CellBroadcastResources.getMessageDetails(getActivity(),
	mCurrentLoaderId == LOADER_HISTORY_FROM_CBS, message, locationCheckTime,
	messageDisplayed, geometry);
	int titleId = (mCurrentLoaderId == LOADER_NORMAL_HISTORY)
	? R.string.view_details_title : R.string.view_details_debugging_title;
	new AlertDialog.Builder(getActivity())
	.setTitle(titleId)
	.setMessage(details)
	.setCancelable(true)
	.show();
	}

	private final OnCreateContextMenuListener mOnCreateContextMenuListener =
	(menu, v, menuInfo) -> {
	menu.setHeaderTitle(R.string.message_options);
	menu.add(0, MENU_VIEW_DETAILS, 0, R.string.menu_view_details);
	if (mCurrentLoaderId == LOADER_NORMAL_HISTORY) {
	menu.add(0, MENU_DELETE, 0, R.string.menu_delete);
	}
	};

	private void updateNoAlertTextVisibility() {
	TextView noAlertsTextView = getActivity().findViewById(R.id.empty);
	if (noAlertsTextView != null) {
	noAlertsTextView.setVisibility(!hasAlertsInHistory()
	? View.VISIBLE : View.INVISIBLE);
	}
	}

	/**
	* @return {@code true} if the alert history database has any item
	*/
	private boolean hasAlertsInHistory() {
	return mAdapter.getCursor().getCount() > 0;
	}

	/**
	* Get the location check time of the message.
	*
	* @param cursor The cursor of the database
	* @return The EPOCH time in milliseconds that the location check was performed on the
	* message. -1 if the information is not available.
	*/
	private long getLocationCheckTime(Cursor cursor) {
	if (mCurrentLoaderId != LOADER_HISTORY_FROM_CBS) return -1;
	return cursor.getLong(cursor.getColumnIndex(
	Telephony.CellBroadcasts.LOCATION_CHECK_TIME));
	}

	/**
	* Check if the message has been displayed to the user or not
	*
	* @param cursor The cursor of the database
	* @return {@code true} if the message was displayed to the user, otherwise {@code false}.
	*/
	private boolean wasMessageDisplayed(Cursor cursor) {
	if (mCurrentLoaderId != LOADER_HISTORY_FROM_CBS) return true;
	return cursor.getInt(cursor.getColumnIndex(
	Telephony.CellBroadcasts.MESSAGE_DISPLAYED)) != 0;
	}

	/**
	* Get the geometry string from the message if available.
	*
	* @param cursor The cursor of the database
	* @return The geometry string
	*/
	private @Nullable String getGeometryString(Cursor cursor) {
	if (mCurrentLoaderId != LOADER_HISTORY_FROM_CBS) return null;
	if (cursor.getColumnIndex(Telephony.CellBroadcasts.GEOMETRIES) >= 0) {
	return cursor.getString(cursor.getColumnIndex(Telephony.CellBroadcasts.GEOMETRIES));
	}
	return null;
	}

	@Override
	public boolean onContextItemSelected(MenuItem item) {
	Cursor cursor = mAdapter.getCursor();
	if (cursor != null && cursor.getPosition() >= 0) {
	switch (item.getItemId()) {
	case MENU_DELETE:
	confirmDeleteThread(cursor.getLong(cursor.getColumnIndexOrThrow(
	Telephony.CellBroadcasts._ID)));
	break;

	case MENU_VIEW_DETAILS:
	showBroadcastDetails(CellBroadcastCursorAdapter.createFromCursor(
	getContext(), cursor), getLocationCheckTime(cursor),
	wasMessageDisplayed(cursor), getGeometryString(cursor));
	break;

	default:
	break;
	}
	}
	return super.onContextItemSelected(item);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	switch(item.getItemId()) {
	case MENU_DELETE_ALL:
	confirmDeleteThread(-1);
	break;

	case MENU_SHOW_ALL_MESSAGES:
	getLoaderManager().restartLoader(LOADER_HISTORY_FROM_CBS, null, this);
	break;

	case MENU_SHOW_REGULAR_MESSAGES:
	getLoaderManager().restartLoader(LOADER_NORMAL_HISTORY, null, this);
	break;

	default:
	return true;
	}
	return false;
	}

	/**
	* Start the process of putting up a dialog to confirm deleting a broadcast.
	* @param rowId the row ID of the broadcast to delete, or -1 to delete all broadcasts
	*/
	public void confirmDeleteThread(long rowId) {
	DeleteThreadListener listener = new DeleteThreadListener(rowId);
	confirmDeleteThreadDialog(listener, (rowId == -1), getActivity());
	}

	/**
	* Build and show the proper delete broadcast dialog. The UI is slightly different
	* depending on whether there are locked messages in the thread(s) and whether we're
	* deleting a single broadcast or all broadcasts.
	* @param listener gets called when the delete button is pressed
	* @param deleteAll whether to show a single thread or all threads UI
	* @param context used to load the various UI elements
	*/
	public static void confirmDeleteThreadDialog(DeleteThreadListener listener,
	boolean deleteAll, Context context) {
	AlertDialog.Builder builder = new AlertDialog.Builder(context);
	builder.setIconAttribute(android.R.attr.alertDialogIcon)
	.setCancelable(true)
	.setPositiveButton(R.string.button_delete, listener)
	.setNegativeButton(R.string.button_cancel, null)
	.setMessage(deleteAll ? R.string.confirm_delete_all_broadcasts
	: R.string.confirm_delete_broadcast)
	.show();
	}

	public class DeleteThreadListener implements OnClickListener {
	private final long mRowId;

	public DeleteThreadListener(long rowId) {
	mRowId = rowId;
	}

	@Override
	public void onClick(DialogInterface dialog, int whichButton) {
	// delete from database on a background thread
	new CellBroadcastContentProvider.AsyncCellBroadcastTask(
	getActivity().getContentResolver()).execute(
	(CellBroadcastContentProvider.CellBroadcastOperation) provider -> {
	if (mRowId != -1) {
	return provider.deleteBroadcast(mRowId);
	} else {
	return provider.deleteAllBroadcasts();
	}
	});

	dialog.dismiss();
	}
	}
	}
	}