Java tutorial
/* * Copyright 2014 Uwe Trottmann * * 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.battlelancer.seriesguide.ui.dialogs; import android.app.Activity; import android.content.ContentValues; import android.database.Cursor; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.text.InputFilter; import android.text.Spanned; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.EditText; import com.battlelancer.seriesguide.R; import com.battlelancer.seriesguide.interfaces.OnListsChangedListener; import com.battlelancer.seriesguide.provider.SeriesGuideContract.ListItems; import com.battlelancer.seriesguide.provider.SeriesGuideContract.Lists; import com.battlelancer.seriesguide.ui.SeriesGuidePreferences; import com.battlelancer.seriesguide.util.Utils; /** * Dialog to rename or remove a list. */ public class ListManageDialogFragment extends DialogFragment { public static ListManageDialogFragment newInstance(String listId) { ListManageDialogFragment f = new ListManageDialogFragment(); Bundle args = new Bundle(); args.putString("listid", listId); f.setArguments(args); return f; } private EditText mTitle; private OnListsChangedListener mListener; private Button mButtonNegative; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // hide title, use custom theme if (SeriesGuidePreferences.THEME == R.style.Theme_SeriesGuide_DarkBlue) { setStyle(STYLE_NO_TITLE, 0); } else if (SeriesGuidePreferences.THEME == R.style.Theme_SeriesGuide_Light) { setStyle(STYLE_NO_TITLE, R.style.Theme_SeriesGuide_Light_Dialog); } else { setStyle(STYLE_NO_TITLE, R.style.Theme_SeriesGuide_Dialog); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View layout = inflater.inflate(R.layout.dialog_list_manage, container, false); // title mTitle = (EditText) layout.findViewById(R.id.editTextListManageListTitle); mTitle.setFilters(new InputFilter[] { new CharAndDigitInputFilter() }); // buttons mButtonNegative = (Button) layout.findViewById(R.id.buttonNegative); mButtonNegative.setText(R.string.list_remove); mButtonNegative.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // remove list and items String listId = getArguments().getString("listid"); getActivity().getContentResolver().delete(Lists.buildListUri(listId), null, null); getActivity().getContentResolver().delete(ListItems.CONTENT_URI, Lists.LIST_ID + "=?", new String[] { listId }); // remove tab from view pager mListener.onListsChanged(); dismiss(); } }); Button buttonPositive = (Button) layout.findViewById(R.id.buttonPositive); buttonPositive.setText(android.R.string.ok); buttonPositive.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // prevent whitespaces/empty names if (mTitle.getText().toString().trim().length() == 0) { return; } // update title String listId = getArguments().getString("listid"); ContentValues values = new ContentValues(); values.put(Lists.NAME, mTitle.getText().toString()); getActivity().getContentResolver().update(Lists.buildListUri(listId), values, null, null); // refresh view pager mListener.onListsChanged(); dismiss(); } }); return layout; } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mListener = (OnListsChangedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnListsChangedListener"); } } @Override public void onStart() { super.onStart(); Utils.trackView(getActivity(), "List Manage Dialog"); } @Override public void onActivityCreated(Bundle arg0) { super.onActivityCreated(arg0); // pre-populate list title String listId = getArguments().getString("listid"); final Cursor list = getActivity().getContentResolver().query(Lists.buildListUri(listId), new String[] { Lists.NAME }, null, null, null); list.moveToFirst(); mTitle.setText(list.getString(0)); list.close(); // do not allow removing last list, disable remove button Cursor lists = getActivity().getContentResolver().query(Lists.CONTENT_URI, new String[] { Lists._ID }, null, null, null); if (lists.getCount() == 1) { mButtonNegative.setEnabled(false); } lists.close(); } /** * Display a dialog which allows to edit the title of this list or remove * it. */ public static void showListManageDialog(String listId, FragmentManager fm) { // DialogFragment.show() will take care of adding the fragment // in a transaction. We also want to remove any currently showing // dialog, so make our own transaction and take care of that here. FragmentTransaction ft = fm.beginTransaction(); Fragment prev = fm.findFragmentByTag("listmanagedialog"); if (prev != null) { ft.remove(prev); } ft.addToBackStack(null); // Create and show the dialog. DialogFragment newFragment = ListManageDialogFragment.newInstance(listId); newFragment.show(ft, "listmanagedialog"); } /** * Restricts text input to characters and digits preventing any special * characters. */ public static class CharAndDigitInputFilter implements InputFilter { @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { for (int i = start; i < end; i++) { if (!(Character.isLetterOrDigit(source.charAt(i)) || Character.isWhitespace(source.charAt(i)))) { return ""; } } return null; } } }