Java tutorial
/** * Catroid: An on-device visual programming system for Android devices * Copyright (C) 2010-2013 The Catrobat Team * (<http://developer.catrobat.org/credits>) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * An additional term exception under section 7 of the GNU Affero * General Public License, version 3, is available at * http://developer.catrobat.org/license_additional_term * * 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.catrobat.catroid.ui.fragment; import org.catrobat.catroid.ProjectManager; import org.catrobat.catroid.R; import org.catrobat.catroid.common.Constants; import org.catrobat.catroid.content.Project; import org.catrobat.catroid.content.Sprite; import org.catrobat.catroid.formulaeditor.FormulaEditorEditText; import org.catrobat.catroid.formulaeditor.UserVariable; import org.catrobat.catroid.formulaeditor.UserVariablesContainer; import org.catrobat.catroid.ui.adapter.UserVariableAdapter; import org.catrobat.catroid.ui.dialogs.NewVariableDialog; import org.catrobat.catroid.ui.dialogs.NewVariableDialog.NewVariableDialogListener; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.Button; import android.widget.ListView; import com.actionbarsherlock.app.SherlockFragmentActivity; import com.actionbarsherlock.app.SherlockListFragment; import com.actionbarsherlock.view.ActionMode; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuItem; public class FormulaEditorVariableListFragment extends SherlockListFragment implements Dialog.OnKeyListener, UserVariableAdapter.OnCheckedChangeListener, UserVariableAdapter.OnListItemClickListener, NewVariableDialogListener { public static final String VARIABLE_TAG = "variableFragment"; private FormulaEditorEditText formulaEditorEditText; private String actionBarTitle; private ActionMode contextActionMode; private boolean inContextMode; private int deleteIndex; private UserVariableAdapter adapter; public FormulaEditorVariableListFragment(FormulaEditorEditText formulaEditorEditText, String actionBarTitle, String fragmentTag) { this.formulaEditorEditText = formulaEditorEditText; this.actionBarTitle = actionBarTitle; contextActionMode = null; deleteIndex = -1; inContextMode = false; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); initializeUserVariableAdapter(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View fragmentView = inflater.inflate(R.layout.fragment_formula_editor_variablelist, container, false); return fragmentView; } @Override public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo) { if (!inContextMode) { super.onCreateContextMenu(menu, view, menuInfo); getSherlockActivity().getMenuInflater().inflate(R.menu.menu_formulaeditor_variablelist, menu); } } @Override public void onPrepareOptionsMenu(Menu menu) { for (int index = 0; index < menu.size(); index++) { menu.getItem(index).setVisible(false); } menu.findItem(R.id.delete).setVisible(true); getSherlockActivity().getSupportActionBar().setDisplayShowTitleEnabled(true); getSherlockActivity().getSupportActionBar().setTitle(actionBarTitle); getSherlockActivity().getSupportActionBar().setDisplayHomeAsUpEnabled(false); super.onPrepareOptionsMenu(menu); } @Override public void onListItemClick(int position) { if (!inContextMode) { formulaEditorEditText.handleKeyEvent(0, "" + adapter.getItem(position).getName()); KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK); onKey(null, keyEvent.getKeyCode(), keyEvent); } } @Override public void onCheckedChange() { if (inContextMode) { String title = adapter.getAmountOfCheckedItems() + " " + getString(R.string.formula_editor_variable_context_action_item_selected); contextActionMode.setTitle(title); } } @Override public void onStart() { this.registerForContextMenu(getListView()); getListView().setItemsCanFocus(true); getListView().setLongClickable(true); getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); getListView().setOnItemLongClickListener(new OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> arg0, View view, int position, long id) { if (!inContextMode) { deleteIndex = position; getSherlockActivity().openContextMenu(getListView()); return true; } return false; } }); Button bottomBar = (Button) getSherlockActivity() .findViewById(R.id.formula_editor_variable_list_bottom_bar); bottomBar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { NewVariableDialog dialog = new NewVariableDialog(); dialog.show(getSherlockActivity().getSupportFragmentManager(), NewVariableDialog.DIALOG_FRAGMENT_TAG); } }); adapter.notifyDataSetChanged(); super.onStart(); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.delete: inContextMode = true; contextActionMode = getSherlockActivity().startActionMode(mContextModeCallback); return true; default: return super.onOptionsItemSelected(item); } } @Override public boolean onContextItemSelected(android.view.MenuItem item) { switch (item.getItemId()) { case R.id.menu_delete: if (!adapter.isEmpty()) { ProjectManager.getInstance().getCurrentProject().getUserVariables() .deleteUserVariableByName(adapter.getItem(deleteIndex).getName()); adapter.notifyDataSetChanged(); } return true; default: return super.onContextItemSelected(item); } } @Override public void onFinishNewVariableDialog() { adapter.notifyDataSetChanged(); } public void showFragment(Context context) { SherlockFragmentActivity activity = (SherlockFragmentActivity) context; FragmentManager fragmentManager = activity.getSupportFragmentManager(); FragmentTransaction fragTransaction = fragmentManager.beginTransaction(); Fragment formulaEditorFragment = fragmentManager .findFragmentByTag(FormulaEditorFragment.FORMULA_EDITOR_FRAGMENT_TAG); fragTransaction.hide(formulaEditorFragment); fragTransaction.show(this); fragTransaction.commit(); if (adapter != null) { initializeUserVariableAdapter(); } } private void initializeUserVariableAdapter() { Sprite currentSprite = ProjectManager.getInstance().getCurrentSprite(); Project currentProject = ProjectManager.getInstance().getCurrentProject(); UserVariablesContainer userVariableContainer = currentProject.getUserVariables(); adapter = userVariableContainer.createUserVariableAdapter(getSherlockActivity(), currentSprite); setListAdapter(adapter); adapter.setOnCheckedChangeListener(this); adapter.setOnListItemClickListener(this); } @Override public boolean onKey(DialogInterface d, int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_BACK: FragmentTransaction fragmentTransaction = getSherlockActivity().getSupportFragmentManager() .beginTransaction(); fragmentTransaction.hide(this); fragmentTransaction.show(getSherlockActivity().getSupportFragmentManager() .findFragmentByTag(FormulaEditorFragment.FORMULA_EDITOR_FRAGMENT_TAG)); fragmentTransaction.commit(); return true; default: break; } return false; } private ActionMode.Callback mContextModeCallback = new ActionMode.Callback() { @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { adapter.setSelectMode(Constants.MULTI_SELECT); adapter.notifyDataSetChanged(); mode.setTitle("0 " + getString(R.string.formula_editor_variable_context_action_item_selected)); return true; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { return false; } @Override public void onDestroyActionMode(ActionMode mode) { UserVariablesContainer userVariablesContainer = ProjectManager.getInstance().getCurrentProject() .getUserVariables(); if (!adapter.isEmpty()) { for (UserVariable var : adapter.getCheckedUserVariables()) { userVariablesContainer.deleteUserVariableByName(var.getName()); } } adapter.setSelectMode(Constants.SELECT_NONE); adapter.notifyDataSetChanged(); contextActionMode = null; inContextMode = false; } }; }