Java tutorial
/* * PowerSwitch by Max Rosin & Markus Ressel * Copyright (C) 2015 Markus Ressel * * 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 eu.power_switch.gui.fragment; import android.Manifest; import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.support.v4.content.ContextCompat; import android.support.v4.content.LocalBroadcastManager; import android.support.v7.app.AlertDialog; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.StaggeredGridLayoutManager; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import eu.power_switch.R; import eu.power_switch.backup.Backup; import eu.power_switch.backup.BackupHandler; import eu.power_switch.gui.IconicsHelper; import eu.power_switch.gui.StatusMessageHandler; import eu.power_switch.gui.activity.MainActivity; import eu.power_switch.gui.adapter.BackupRecyclerViewAdapter; import eu.power_switch.gui.dialog.CreateBackupDialog; import eu.power_switch.gui.dialog.EditBackupDialog; import eu.power_switch.gui.dialog.PathChooserDialog; import eu.power_switch.settings.DeveloperPreferencesHandler; import eu.power_switch.settings.SmartphonePreferencesHandler; import eu.power_switch.shared.ThemeHelper; import eu.power_switch.shared.constants.LocalBroadcastConstants; import eu.power_switch.shared.constants.PermissionConstants; import eu.power_switch.shared.constants.TutorialConstants; import eu.power_switch.shared.exception.backup.BackupNotFoundException; import eu.power_switch.shared.log.Log; import eu.power_switch.shared.permission.PermissionHelper; import eu.power_switch.shared.settings.WearablePreferencesHandler; import uk.co.deanwild.materialshowcaseview.MaterialShowcaseView; /** * Fragment holding a list of all Backups */ public class BackupFragment extends RecyclerViewFragment { private static final Comparator<Backup> backupsComparator = new Comparator<Backup>() { @Override public int compare(Backup lhs, Backup rhs) { return lhs.compareDate(rhs); } }; private ArrayList<Backup> backups = new ArrayList<>(); private RecyclerView recyclerViewBackups; private BackupRecyclerViewAdapter backupArrayAdapter; private BroadcastReceiver broadcastReceiver; private FloatingActionButton fab; private TextView textViewBackupPath; /** * Used to notify Backup Fragment (this) that Backups have changed * * @param context any suitable context */ public static void sendBackupsChangedBroadcast(Context context) { Log.d("AddReceiverDialog", "sendReceiverChangedBroadcast"); Intent intent = new Intent(LocalBroadcastConstants.INTENT_BACKUP_CHANGED); LocalBroadcastManager.getInstance(context).sendBroadcast(intent); } @Override public void onCreateViewEvent(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { rootView = inflater.inflate(R.layout.fragment_backup, container, false); setHasOptionsMenu(true); final RecyclerViewFragment recyclerViewFragment = this; textViewBackupPath = (TextView) rootView.findViewById(R.id.textView_backupPath); textViewBackupPath.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!PermissionHelper.isWriteExternalStoragePermissionAvailable(getContext())) { new AlertDialog.Builder(getContext()).setTitle(R.string.missing_permission) .setMessage(R.string.missing_external_storage_permission) .setNeutralButton(R.string.close, null).show(); return; } PathChooserDialog pathChooserDialog = PathChooserDialog.newInstance(); pathChooserDialog.setTargetFragment(recyclerViewFragment, 0); pathChooserDialog.show(getActivity().getSupportFragmentManager(), null); } }); recyclerViewBackups = (RecyclerView) rootView.findViewById(R.id.recyclerView); backupArrayAdapter = new BackupRecyclerViewAdapter(this, getActivity(), backups); backupArrayAdapter.setOnItemClickListener(new BackupRecyclerViewAdapter.OnItemClickListener() { @Override public void onItemClick(View itemView, int position) { final Backup backup = backups.get(position); AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setPositiveButton(getActivity().getString(R.string.restore), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { try { BackupHandler backupHandler = new BackupHandler(getActivity()); backupHandler.restoreBackup(backup.getName()); DeveloperPreferencesHandler.forceRefresh(); SmartphonePreferencesHandler.forceRefresh(getContext()); WearablePreferencesHandler.forceRefresh(getContext()); // restart app to apply getActivity().finish(); Intent intent = new Intent(getContext(), MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } catch (BackupNotFoundException e) { Log.e(e); StatusMessageHandler.showInfoMessage(recyclerViewFragment.getRecyclerView(), R.string.backup_not_found, Snackbar.LENGTH_LONG); } catch (Exception e) { StatusMessageHandler.showErrorMessage(recyclerViewFragment.getRecyclerView(), e); } } }).setNeutralButton(getActivity().getString(android.R.string.cancel), null) .setTitle(getActivity().getString(R.string.are_you_sure)) .setMessage(R.string.restore_backup_message); AlertDialog dialog = builder.create(); dialog.show(); } }); backupArrayAdapter.setOnItemLongClickListener(new BackupRecyclerViewAdapter.OnItemLongClickListener() { @Override public void onItemLongClick(View itemView, int position) { final Backup backup = backups.get(position); EditBackupDialog editBackupDialog = EditBackupDialog.newInstance(backup.getName()); editBackupDialog.setTargetFragment(recyclerViewFragment, 0); editBackupDialog.show(getActivity().getSupportFragmentManager(), null); } }); recyclerViewBackups.setAdapter(backupArrayAdapter); StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(getSpanCount(), StaggeredGridLayoutManager.VERTICAL); recyclerViewBackups.setLayoutManager(layoutManager); fab = (FloatingActionButton) rootView.findViewById(R.id.add_fab); fab.setImageDrawable(IconicsHelper.getAddIcon(getActivity(), ContextCompat.getColor(getActivity(), android.R.color.white))); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!PermissionHelper.isWriteExternalStoragePermissionAvailable(getContext())) { new AlertDialog.Builder(getContext()).setTitle(R.string.missing_permission) .setMessage(R.string.missing_external_storage_permission) .setNeutralButton(R.string.close, null).show(); return; } CreateBackupDialog createBackupDialog = new CreateBackupDialog(); createBackupDialog.setTargetFragment(recyclerViewFragment, 0); createBackupDialog.show(getFragmentManager(), null); } }); // BroadcastReceiver to get notifications from background service if data has changed broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Log.d("BackupFragment", "received intent: " + intent.getAction()); switch (intent.getAction()) { case LocalBroadcastConstants.INTENT_PERMISSION_CHANGED: int permissionRequestCode = intent.getIntExtra(PermissionConstants.KEY_REQUEST_CODE, 0); int[] results = intent.getIntArrayExtra(PermissionConstants.KEY_RESULTS); if (permissionRequestCode == PermissionConstants.REQUEST_CODE_STORAGE_PERMISSION) { if (results[0] == PackageManager.PERMISSION_GRANTED) { // Permission Granted updateListContent(); StatusMessageHandler.showInfoMessage(getRecyclerView(), R.string.permission_granted, Snackbar.LENGTH_SHORT); } else { // Permission Denied StatusMessageHandler.showPermissionMissingMessage(getActivity(), getRecyclerView(), Manifest.permission.WRITE_EXTERNAL_STORAGE); } } break; case LocalBroadcastConstants.INTENT_BACKUP_CHANGED: updateUI(); } } }; } @Override protected void onInitialized() { updateUI(); } private void showTutorial() { new MaterialShowcaseView.Builder(getActivity()).setTarget(fab).setUseAutoRadius(false).setRadius(64 * 3) .setDismissOnTouch(true).setDismissText(getString(R.string.tutorial__got_it)) .setContentText(getString(R.string.tutorial__backup_explanation)) .singleUse(TutorialConstants.BACKUP_KEY).setDelay(500).show(); } private void updateUI() { textViewBackupPath.setText(SmartphonePreferencesHandler.getBackupPath()); if (!PermissionHelper.isWriteExternalStoragePermissionAvailable(getContext())) { showEmpty(); StatusMessageHandler.showPermissionMissingMessage(getActivity(), getRecyclerView(), Manifest.permission.WRITE_EXTERNAL_STORAGE); } else { updateListContent(); } } @Override public boolean onOptionsItemSelected(MenuItem menuItem) { if (super.onOptionsItemSelected(menuItem)) { return true; } switch (menuItem.getItemId()) { case R.id.create_backup: if (!PermissionHelper.isWriteExternalStoragePermissionAvailable(getContext())) { new AlertDialog.Builder(getContext()).setTitle(R.string.missing_permission) .setMessage(R.string.missing_external_storage_permission) .setNeutralButton(R.string.close, null).show(); break; } CreateBackupDialog createBackupDialog = new CreateBackupDialog(); createBackupDialog.setTargetFragment(this, 0); createBackupDialog.show(getFragmentManager(), null); default: break; } return super.onOptionsItemSelected(menuItem); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.backup_fragment_menu, menu); final int color = ThemeHelper.getThemeAttrColor(getActivity(), android.R.attr.textColorPrimary); menu.findItem(R.id.create_backup).setIcon(IconicsHelper.getAddIcon(getActivity(), color)); if (!SmartphonePreferencesHandler.getUseOptionsMenuInsteadOfFAB()) { menu.findItem(R.id.create_backup).setVisible(false).setEnabled(false); } } @Override public void onResume() { super.onResume(); if (SmartphonePreferencesHandler.getUseOptionsMenuInsteadOfFAB()) { fab.setVisibility(View.GONE); } else { fab.setVisibility(View.VISIBLE); } showTutorial(); } @Override public void onStart() { super.onStart(); IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(LocalBroadcastConstants.INTENT_BACKUP_CHANGED); intentFilter.addAction(LocalBroadcastConstants.INTENT_PERMISSION_CHANGED); LocalBroadcastManager.getInstance(getActivity()).registerReceiver(broadcastReceiver, intentFilter); } @Override public void onStop() { LocalBroadcastManager.getInstance(getActivity()).unregisterReceiver(broadcastReceiver); super.onStop(); } @Override public RecyclerView getRecyclerView() { return recyclerViewBackups; } @Override public RecyclerView.Adapter getRecyclerViewAdapter() { return backupArrayAdapter; } @Override protected int getSpanCount() { return getResources().getInteger(R.integer.backup_grid_span_count); } @Override public List refreshListData() throws Exception { backups.clear(); BackupHandler backupHandler = new BackupHandler(getActivity()); for (Backup backup : backupHandler.getBackups()) { backups.add(backup); } Collections.sort(backups, backupsComparator); return backups; } }