Java tutorial
/* * Copyright 2016 Adrian Videnie * * This file is part of Expenses. * * Expenses 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. * * Expenses 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 Expenses. If not, see <http://www.gnu.org/licenses/>. */ package ro.expectations.expenses.ui.backup; import android.Manifest; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.content.ContextCompat; import android.support.v7.view.ActionMode; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.text.Html; 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.ViewGroup; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; import org.greenrobot.eventbus.EventBus; import org.greenrobot.eventbus.Subscribe; import org.greenrobot.eventbus.ThreadMode; import java.io.File; import ro.expectations.expenses.R; import ro.expectations.expenses.helper.BackupHelper; import ro.expectations.expenses.helper.DrawableHelper; import ro.expectations.expenses.restore.AbstractRestoreIntentService; import ro.expectations.expenses.restore.FinancistoImportIntentService; import ro.expectations.expenses.ui.common.OnAppBarHeightChangeListener; import ro.expectations.expenses.widget.dialog.AlertDialogFragment; import ro.expectations.expenses.widget.dialog.ConfirmationDialogFragment; import ro.expectations.expenses.widget.dialog.ProgressDialogFragment; import ro.expectations.expenses.widget.recyclerview.DividerItemDecoration; import ro.expectations.expenses.widget.recyclerview.ItemClickHelper; public class FinancistoImportFragment extends Fragment implements ConfirmationDialogFragment.Listener { private static final String TAG = FinancistoImportFragment.class.getSimpleName(); private static final int REQUEST_PERMISSION_READ_EXTERNAL_STORAGE = 0; private static final int CONFIRMATION_DIALOG_REQUEST_CODE = 0; private static final String KEY_SELECTED_FILE = "selected_file"; private FinancistoImportAdapter mAdapter; private TextView mEmptyView; private LinearLayout mRequestPermissionRationale; private TextView mPermissionRationale; private Button mAllowAccess; private boolean mDismissProgressBar = false; private boolean mLaunchAlertDialog = false; private File mSelectedFile; private OnAppBarHeightChangeListener mOnAppBarHeightChangeListener; private ActionMode mActionMode; private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() { @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { MenuInflater inflater = mode.getMenuInflater(); inflater.inflate(R.menu.context_menu_import_financisto, menu); MenuItem actionFinancistoImport = menu.findItem(R.id.action_financisto_import); actionFinancistoImport.setIcon( DrawableHelper.tint(getContext(), actionFinancistoImport.getIcon(), R.color.colorWhite)); return true; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { mode.setTitle(getResources().getQuantityString(R.plurals.selected_backup_files, 1, 1)); mOnAppBarHeightChangeListener.onAppBarHeightChange(false); return true; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { int id = item.getItemId(); switch (id) { case R.id.action_financisto_import: mSelectedFile = mAdapter.getItem(mAdapter.getSelectedItemPosition()); FragmentActivity activity = getActivity(); if (activity != null) { ConfirmationDialogFragment confirmationDialogFragment = ConfirmationDialogFragment.newInstance( activity.getString(R.string.financisto_import_confirmation_title), activity.getString(R.string.financisto_import_confirmation_message), activity.getString(R.string.button_import), activity.getString(R.string.button_cancel), false); confirmationDialogFragment.setTargetFragment(FinancistoImportFragment.this, CONFIRMATION_DIALOG_REQUEST_CODE); confirmationDialogFragment.show(activity.getSupportFragmentManager(), "ConfirmationDialogFragment"); } return true; default: return false; } } @Override public void onDestroyActionMode(ActionMode mode) { mActionMode = null; if (mAdapter.isChoiceMode()) { mAdapter.clearSelection(); } mOnAppBarHeightChangeListener.onAppBarHeightChange(true); } }; static FinancistoImportFragment newInstance() { return new FinancistoImportFragment(); } public FinancistoImportFragment() { // Required empty public constructor } @Override public void onAttach(Context context) { super.onAttach(context); try { mOnAppBarHeightChangeListener = (OnAppBarHeightChangeListener) context; } catch (ClassCastException e) { throw new ClassCastException(context.toString() + " must implement OnAppBarHeightChangeListener"); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_backup, container, false); mRequestPermissionRationale = (LinearLayout) rootView.findViewById(R.id.request_permission_rationale); mPermissionRationale = (TextView) rootView.findViewById(R.id.permission_rationale); mAllowAccess = (Button) rootView.findViewById(R.id.allow_access); mEmptyView = (TextView) rootView.findViewById(R.id.list_backup_empty); RecyclerView mRecyclerView = (RecyclerView) rootView.findViewById(R.id.list_backup); mRecyclerView.setHasFixedSize(true); mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); mRecyclerView .addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST)); mAdapter = new FinancistoImportAdapter(getActivity(), new File[0]); mRecyclerView.setAdapter(mAdapter); ItemClickHelper itemClickHelper = new ItemClickHelper(mRecyclerView); itemClickHelper.setOnItemClickListener(new ItemClickHelper.OnItemClickListener() { @Override public void onItemClick(RecyclerView parent, View view, int position) { boolean isItemSelected = mAdapter.isItemSelected(position); if (isItemSelected) { mAdapter.setItemSelected(position, false); if (mActionMode != null) { mActionMode.finish(); } } else if (mAdapter.isChoiceMode()) { mAdapter.setItemSelected(position, true); if (mActionMode == null) { mActionMode = ((FinancistoImportActivity) getActivity()) .startSupportActionMode(mActionModeCallback); } else { mActionMode.invalidate(); } } } }); itemClickHelper.setOnItemLongClickListener(new ItemClickHelper.OnItemLongClickListener() { @Override public boolean onItemLongClick(RecyclerView parent, View view, int position) { boolean isItemSelected = mAdapter.isItemSelected(position); if (isItemSelected) { mAdapter.setItemSelected(position, false); if (mActionMode != null) { mActionMode.finish(); } } else { mAdapter.setItemSelected(position, true); if (mActionMode == null) { mActionMode = ((FinancistoImportActivity) getActivity()) .startSupportActionMode(mActionModeCallback); } else { mActionMode.invalidate(); } } return true; } }); if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) { setupRecyclerView(); } else if (shouldShowRequestPermissionRationale(Manifest.permission.READ_EXTERNAL_STORAGE)) { showRequestPermissionRationale(); mAllowAccess.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { requestPermissions(new String[] { Manifest.permission.READ_EXTERNAL_STORAGE }, REQUEST_PERMISSION_READ_EXTERNAL_STORAGE); } }); mAllowAccess.setVisibility(View.VISIBLE); } else { requestPermissions(new String[] { Manifest.permission.READ_EXTERNAL_STORAGE }, REQUEST_PERMISSION_READ_EXTERNAL_STORAGE); } return rootView; } @Override public void onActivityCreated(Bundle savedInstanceState) { if (savedInstanceState != null) { mAdapter.onRestoreInstanceState(savedInstanceState); mSelectedFile = (File) savedInstanceState.getSerializable(KEY_SELECTED_FILE); if (mAdapter.isChoiceMode() && mActionMode == null) { mActionMode = ((FinancistoImportActivity) getActivity()) .startSupportActionMode(mActionModeCallback); } } super.onActivityCreated(savedInstanceState); } @Override public void onStart() { super.onStart(); EventBus.getDefault().register(this); } @Override public void onResume() { super.onResume(); if (mDismissProgressBar) { hideProgressDialog(); mDismissProgressBar = false; } if (mLaunchAlertDialog) { showAlertDialog(); mLaunchAlertDialog = false; } } @Override public void onSaveInstanceState(Bundle outState) { mAdapter.onSaveInstanceState(outState); outState.putSerializable(KEY_SELECTED_FILE, mSelectedFile); } @Override public void onStop() { EventBus.getDefault().unregister(this); super.onStop(); } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (requestCode == REQUEST_PERMISSION_READ_EXTERNAL_STORAGE) { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { setupRecyclerView(); } else { showRequestPermissionRationale(); mAllowAccess.setVisibility(View.GONE); } } } @Override public void onConfirmed(int targetRequestCode) { if (targetRequestCode == CONFIRMATION_DIALOG_REQUEST_CODE) { Intent financistoImportIntent = new Intent(getActivity(), FinancistoImportIntentService.class); financistoImportIntent.putExtra(AbstractRestoreIntentService.ARG_FILE_URI, Uri.fromFile(mSelectedFile).getPath()); getActivity().startService(financistoImportIntent); showProgressDialog(); } } @Override public void onDenied(int targetRequestCode) { // nothing to do } @Subscribe(sticky = true, threadMode = ThreadMode.MAIN) public void onSuccess(FinancistoImportIntentService.SuccessEvent successEvent) { hideProgressDialog(); showAlertDialog(); if (mActionMode != null) { mActionMode.finish(); } EventBus.getDefault().removeStickyEvent(successEvent); } @Subscribe(sticky = true, threadMode = ThreadMode.MAIN) public void onFailure(FinancistoImportIntentService.ErrorEvent errorEvent) { Log.e(TAG, "An error occurred while importing Financisto backup: " + errorEvent.getException().getMessage(), errorEvent.getException()); EventBus.getDefault().removeStickyEvent(errorEvent); } private void showRequestPermissionRationale() { String app = getString(R.string.app_name); String permissionRationale = String.format(getString(R.string.read_storage_rationale_financisto_import), app, app); mPermissionRationale.setText(Html.fromHtml(permissionRationale)); mRequestPermissionRationale.setVisibility(View.VISIBLE); } private void setupRecyclerView() { File[] files = BackupHelper.listBackups(BackupHelper.getFinancistoBackupFolder()); mAdapter.setFiles(files); mRequestPermissionRationale.setVisibility(View.GONE); mEmptyView.setText(getString(R.string.no_financisto_backup_found)); mEmptyView.setVisibility(files.length > 0 ? View.GONE : View.VISIBLE); } private void showAlertDialog() { FragmentActivity activity = getActivity(); if (activity != null && isResumed()) { AlertDialogFragment.newInstance(getString(R.string.success), getString(R.string.financisto_import_successful), true) .show(activity.getSupportFragmentManager(), "AlertDialogFragment"); } else { mLaunchAlertDialog = true; } } private void showProgressDialog() { FragmentActivity activity = getActivity(); if (activity != null) { ProgressDialogFragment.newInstance(getString(R.string.financisto_import_progress), false) .show(activity.getSupportFragmentManager(), "ProgressDialogFragment"); } } private void hideProgressDialog() { FragmentActivity activity = getActivity(); if (activity != null) { ProgressDialogFragment progressDialogFragment = (ProgressDialogFragment) activity .getSupportFragmentManager().findFragmentByTag("ProgressDialogFragment"); if (isResumed() && progressDialogFragment != null && progressDialogFragment.getDialog().isShowing()) { progressDialogFragment.dismiss(); } else { mDismissProgressBar = true; } } } }